[maven-release-plugin] prepare release avaje-ebeanorm-6.10.1

This adds default implementations for register,filter, prepare and log of the change sets.

.gitignore

@@ -7,8 +7,11 @@
 target/
 logs/
 log/
+ebean-autotune.xml
+ebean-profiling*.xml
 /db
 /mydb.db
+!src/test/ddl-review/*.sql
 
 
 # Intellij project files

README.md

@@ -5,16 +5,7 @@
 
 Ebean ORM
 ==============
-[http://ebean-orm.github.io/](http://ebean-orm.github.io/ "Ebean ORM's Website")
-
-
-Maven Dependency
-----------------
-    <dependency>
-      <groupId>org.avaje.ebeanorm</groupId>
-      <artifactId>avaje-ebeanorm</artifactId>
-      <version>4.7.3</version>
-    </dependency>
+[https://ebean-orm.github.io/](http://ebean-orm.github.io/ "Ebean ORM's Website")
 
 
 [Maven central - avaje-ebeanorm](http://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22org.avaje.ebeanorm%22%20AND%20a%3A%22avaje-ebeanorm%22 "maven central ebeanorm")

pom.xml

@@ -9,7 +9,7 @@
 
   <groupId>org.avaje.ebeanorm</groupId>
   <artifactId>avaje-ebeanorm</artifactId>
-  <version>6.2.2</version>
+  <version>6.10.1</version>
   <packaging>jar</packaging>
 
   <name>avaje-ebeanorm</name>
@@ -61,6 +61,14 @@
       <version>1.7.7</version>
     </dependency>
 
+    <!-- provided scope for Spring boot loader classpath scanning support -->
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-loader</artifactId>
+      <version>1.2.7.RELEASE</version>
+      <scope>provided</scope>
+    </dependency>
+
     <!-- provided scope for JsonNode support -->
     <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
@@ -109,10 +117,24 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>9.4-1201-jdbc41</version>
+      <version>9.4-1202-jdbc41</version>
       <scope>provided</scope>
     </dependency>
 
+    <!--<dependency>-->
+      <!--<groupId>oracle</groupId>-->
+      <!--<artifactId>oracle-jdbc</artifactId>-->
+      <!--<version>7.0</version>-->
+      <!--<scope>test</scope>-->
+    <!--</dependency>-->
+
+    <!--<dependency>-->
+      <!--<groupId>microsoft</groupId>-->
+      <!--<artifactId>sqlserver-jdbc</artifactId>-->
+      <!--<version>4.2</version>-->
+      <!--<scope>test</scope>-->
+    <!--</dependency>-->
+
     <dependency>
       <groupId>com.squareup.okhttp</groupId>
       <artifactId>okhttp</artifactId>
@@ -130,15 +152,17 @@
     <dependency>
       <groupId>org.avaje.ebeanorm</groupId>
       <artifactId>avaje-ebeanorm-agent</artifactId>
-      <version>4.5.1</version>
+      <version>4.7.1</version>
       <scope>test</scope>
     </dependency>
-        
+
+    <!-- Provided scope so that the H2HistoryTrigger can live in Ebean core
+         and not require a separate module for it -->
     <dependency>
       <groupId>com.h2database</groupId>
       <artifactId>h2</artifactId>
-      <version>1.4.182</version>
-      <scope>test</scope>
+      <version>1.4.189</version>
+      <scope>provided</scope>
     </dependency>
     
     <dependency>
@@ -195,7 +219,7 @@
       <plugin>
         <groupId>org.avaje.ebeanorm</groupId>
         <artifactId>avaje-ebeanorm-mavenenhancer</artifactId>
-        <version>4.5.1</version>
+        <version>4.7.1</version>
         <executions>
           <!--   Not going to enhance Model bean -->
           <execution>
@@ -204,7 +228,7 @@
             <configuration>
               <classSource>target/test-classes</classSource>
               <packages>com.avaje.tests.**</packages>
-              <transformArgs>debug=1</transformArgs>
+              <transformArgs>debug=2</transformArgs>
             </configuration>
             <goals>
               <goal>enhance</goal>
@@ -249,11 +273,11 @@
         <artifactId>maven-javadoc-plugin</artifactId>
         <version>2.9.1</version>
         <configuration>
-          <doctitle>Ebean 4</doctitle>
+          <doctitle>Ebean 6</doctitle>
           <overview>src/main/java/com/avaje/ebean/overview.html</overview>
           <source>1.8</source>
           <doclet>org.avaje.doclet.PygmentsDoclet</doclet>
-          <excludePackageNames>com.avaje.ebeaninternal.*:com.avaje.ebean.util</excludePackageNames>
+          <excludePackageNames>com.avaje.ebeaninternal.*:com.avaje.ebean.util:com.avaje.ebean.dbmigration.ddlgeneration:com.avaje.ebean.dbmigration.migration:com.avaje.ebean.dbmigration.migrationreader:com.avaje.ebean.dbmigration.model</excludePackageNames>
           <docletArtifact>
             <groupId>org.avaje</groupId>
             <artifactId>pygments-doclet</artifactId>

src/main/java/com/avaje/ebean/AdminAutofetch.java

@@ -1,137 +0,0 @@
-package com.avaje.ebean;
-
-/**
- * Administrative control of Autofetch during runtime.
- */
-public interface AdminAutofetch {
-
-  /**
-   * Return true if profiling is enabled.
-   */
-  boolean isProfiling();
-
-  /**
-   * Set to true to enable profiling.
-   */
-  void setProfiling(boolean enable);
-
-  /**
-   * Return true if autoFetch automatic query tuning is enabled.
-   */
-  boolean isQueryTuning();
-
-  /**
-   * Set to true to enable autoFetch automatic query tuning.
-   */
-  void setQueryTuning(boolean enable);
-
-  /**
-   * Returns the rate which profiling is collected. This is an int between 0 and
-   * 100.
-   */
-  double getProfilingRate();
-
-  /**
-   * Set the rate at which profiling is collected after the base.
-   * 
-   * @param rate
-   *          a int between 0 and 100.
-   */
-  void setProfilingRate(double rate);
-
-  /**
-   * Return the number of queries profiled after which profiling is collected at
-   * a percentage rate.
-   */
-  int getProfilingBase();
-
-  /**
-   * Set a base number of queries to profile per query point.
-   * <p>
-   * After this amount of profiling has been obtained profiling is collected at
-   * the Profiling Percentage rate.
-   * </p>
-   */
-  void setProfilingBase(int profilingBase);
-
-  /**
-   * Return the minimum number of queries profiled before autoFetch will start
-   * automatically tuning the queries.
-   * <p>
-   * This could be one which means start autoFetch tuning after the first
-   * profiling information is collected.
-   * </p>
-   */
-  int getProfilingMin();
-
-  /**
-   * Set the minimum number of queries profiled per query point before autoFetch
-   * will automatically tune the queries.
-   * <p>
-   * Increasing this number will mean more profiling is collected before
-   * autoFetch starts tuning the query.
-   * </p>
-   */
-  void setProfilingMin(int autoFetchMinThreshold);
-
-  /**
-   * Fire a garbage collection (hint to the JVM). Assuming garbage collection
-   * fires this will gather the usage profiling information.
-   */
-  String collectUsageViaGC();
-
-  /**
-   * This will take the current profiling information and update the "tuned
-   * query detail".
-   * <p>
-   * This is done periodically and can also be manually invoked.
-   * </p>
-   * 
-   * @return a summary of the updates that occurred
-   */
-  String updateTunedQueryInfo();
-
-  /**
-   * Clear all the tuned query info.
-   * <p>
-   * Should only need do this for testing and playing around.
-   * </p>
-   * 
-   * @return the amount of tuned query information cleared.
-   */
-  int clearTunedQueryInfo();
-
-  /**
-   * Clear all the profiling information.
-   * <p>
-   * This means the profiling information will need to be re-gathered.
-   * </p>
-   * <p>
-   * Should only need do this for testing and playing around.
-   * </p>
-   * 
-   * @return the amount of profiled information cleared.
-   */
-  int clearProfilingInfo();
-
-  /**
-   * Clear the query execution statistics.
-   */
-  void clearQueryStatistics();
-
-  /**
-   * Return the number of queries tuned by AutoFetch.
-   */
-  int getTotalTunedQueryCount();
-
-  /**
-   * Return the size of the TuneQuery map.
-   */
-  int getTotalTunedQuerySize();
-
-  /**
-   * Return the size of the profile map.
-   */
-  int getTotalProfileSize();
-
-}

src/main/java/com/avaje/ebean/AutoTune.java

@@ -0,0 +1,14 @@
+package com.avaje.ebean;
+
+/**
+ * Administrative control of AutoTune during runtime.
+ */
+public interface AutoTune {
+
+  /**
+   * Fire a garbage collection (hint to the JVM). Assuming garbage collection
+   * fires this will gather remaining usage profiling information.
+   */
+  void collectProfiling();
+
+}

src/main/java/com/avaje/ebean/BeanState.java

@@ -38,6 +38,33 @@ public interface BeanState {
    */
   void setDisableLazyLoad(boolean disableLazyLoading);
 
+  /**
+   * Set the loaded state of the property given it's name.
+   *
+   * <p>
+   *   Typically this would be used to set the loaded state of a property
+   *   to false to ensure that the specific property is excluded from a
+   *   stateless update.
+   * </p>
+   *
+   * <pre>{@code
+   *
+   *   // populate a bean via say JSON
+   *   User user = ...;
+   *
+   *   // set loaded state on the email property to false so that
+   *   // the email property is not included in a stateless update
+   *   Ebean.getBeanState(user).setPropertyLoaded("email", false);
+   *
+   *   user.update();
+   *
+   * }</pre>
+   *
+   *
+   * This will throw an IllegalArgumentException if the property is unknown.
+   */
+  void setPropertyLoaded(String propertyName, boolean loaded);
+
   /**
    * For partially populated beans returns the properties that are loaded on the
    * bean.

src/main/java/com/avaje/ebean/CallableSql.java

@@ -80,7 +80,7 @@ public interface CallableSql {
   /**
    * Return the label that is put into the transaction log.
    */
-  public String getLabel();
+  String getLabel();
 
   /**
    * Set the label that is put in the transaction log.

src/main/java/com/avaje/ebean/DRawSqlColumnsParser.java

@@ -80,17 +80,16 @@ final class DRawSqlColumnsParser {
     return new ColumnMapping.Column(indexPos++, sb.toString(), split[split.length - 1]);
   }
 
-  private int nextComma() {
+  private void nextComma() {
     boolean inQuote = false;
     while (pos < end) {
       char c = sqlSelect.charAt(pos);
       if (c == '\'') {
         inQuote = !inQuote;
       } else if (!inQuote && c == ',') {
-        return pos;
+        return;
       }
       pos++;
     }
-    return pos;
   }
 }

src/main/java/com/avaje/ebean/DRawSqlParser.java

@@ -24,7 +24,7 @@ class DRawSqlParser {
   private int placeHolderAndWhere;
   private int placeHolderHaving;
   private int placeHolderAndHaving;
-  private boolean hasPlaceHolders;
+  private final boolean hasPlaceHolders;
 
   private int selectPos = -1;
   private int distinctPos = -1;
@@ -98,19 +98,7 @@ class DRawSqlParser {
   }
 
   private boolean hasPlaceHolders() {
-    if (placeHolderWhere > -1) {
-      return true;
-    }
-    if (placeHolderAndWhere > -1) {
-      return true;
-    }
-    if (placeHolderHaving > -1) {
-      return true;
-    }
-    if (placeHolderAndHaving > -1) {
-      return true;
-    }
-    return false;
+    return placeHolderWhere > -1 || placeHolderAndWhere > -1 || placeHolderHaving > -1 || placeHolderAndHaving > -1;
   }
 
   /**

src/main/java/com/avaje/ebean/Ebean.java

@@ -22,7 +22,7 @@ import com.avaje.ebean.text.json.JsonContext;
 /**
  * This Ebean object is effectively a singleton that holds a map of registered
  * {@link EbeanServer}s. It additionally provides a convenient way to use the
- * 'default/primary' EbeanServer.
+ * 'default' EbeanServer.
  * <p>
  * If you are using a Dependency Injection framework such as
  * <strong>Spring</strong> or <strong>Guice</strong> you will probably
@@ -168,9 +168,9 @@ public final class Ebean {
             defaultServer = getWithCreate(defaultName.trim());
           }
         }
-      } catch (RuntimeException e) {
+      } catch (Throwable e) {
         logger.error("Error trying to create the default EbeanServer", e);
-        throw e;
+        throw new RuntimeException(e);
       }
     }
 
@@ -178,7 +178,7 @@ public final class Ebean {
       if (defaultServer == null) {
         String msg = "The default EbeanServer has not been defined?";
         msg += " This is normally set via the ebean.datasource.default property.";
-        msg += " Otherwise it should be registered programatically via registerServer()";
+        msg += " Otherwise it should be registered programmatically via registerServer()";
         throw new PersistenceException(msg);
       }
       return defaultServer;
@@ -217,8 +217,8 @@ public final class Ebean {
     /**
      * Register a server so we can get it by its name.
      */
-    private void register(EbeanServer server, boolean isPrimaryServer) {
-      registerWithName(server.getName(), server, isPrimaryServer);
+    private void register(EbeanServer server, boolean isDefaultServer) {
+      registerWithName(server.getName(), server, isDefaultServer);
     }
     
     private void registerWithName(String name, EbeanServer server, boolean isDefaultServer) {

src/main/java/com/avaje/ebean/EbeanServer.java

@@ -1,21 +1,21 @@
 package com.avaje.ebean;
 
-import java.util.Collection;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-
-import javax.persistence.OptimisticLockException;
-import javax.persistence.PersistenceException;
-
 import com.avaje.ebean.annotation.CacheStrategy;
 import com.avaje.ebean.cache.ServerCacheManager;
 import com.avaje.ebean.config.ServerConfig;
 import com.avaje.ebean.meta.MetaInfoManager;
+import com.avaje.ebean.plugin.SpiServer;
 import com.avaje.ebean.text.csv.CsvReader;
 import com.avaje.ebean.text.json.JsonContext;
 import org.jetbrains.annotations.Nullable;
 
+import javax.persistence.OptimisticLockException;
+import javax.persistence.PersistenceException;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
 /**
  * Provides the API for fetching and saving beans to a particular DataSource.
  * <p>
@@ -106,10 +106,9 @@ public interface EbeanServer {
   void shutdown(boolean shutdownDataSource, boolean deregisterDriver);
   
   /**
-   * Return the AdminAutofetch which is used to control and configure the
-   * Autofetch service at runtime.
+   * Return AutoTune which is used to control the AutoTune service at runtime.
    */
-  AdminAutofetch getAdminAutofetch();
+  AutoTune getAutoTune();
 
   /**
    * Return the name. This is used with {@link Ebean#getServer(String)} to get a
@@ -128,6 +127,11 @@ public interface EbeanServer {
    */
   MetaInfoManager getMetaInfoManager();
 
+  /**
+   * Return the extended API intended for use by plugins.
+   */
+  SpiServer getPluginApi();
+
   /**
    * Return the BeanState for a given entity bean.
    * <p>
@@ -1108,6 +1112,21 @@ public interface EbeanServer {
   @Nullable
   <T> T findUnique(Query<T> query, Transaction transaction);
 
+  /**
+   * Execute as a delete query deleting the 'root level' beans that match the predicates
+   * in the query.
+   * <p>
+   * Note that if the query includes joins then the generated delete statement may not be
+   * optimal depending on the database platform.
+   * </p>
+   *
+   * @param query       the query used for the delete
+   * @param transaction the transaction to use (can be null)
+   * @param <T>         the type of entity bean to fetch.
+   * @return the number of beans/rows that were deleted
+   */
+  <T> int delete(Query<T> query, Transaction transaction);
+
   /**
    * Execute the sql query returning a list of MapBean.
    * <p>
@@ -1205,7 +1224,6 @@ public interface EbeanServer {
    *   public class Order { ...
    *
    * 	   @OneToMany(cascade=CascadeType.ALL, mappedBy="order")
-   * 	   @JoinColumn(name="order_id")
    * 	   List<OrderDetail> details;
    * 	   ...
    *   }
@@ -1235,9 +1253,9 @@ public interface EbeanServer {
   void delete(Object bean) throws OptimisticLockException;
 
   /**
-   * Delete all the beans in the collection.
+   * Delete the bean with an explicit transaction.
    */
-  int deleteAll(Collection<?> beans) throws OptimisticLockException;
+  void delete(Object bean, Transaction transaction) throws OptimisticLockException;
 
   /**
    * Delete the bean given its type and id.
@@ -1249,6 +1267,16 @@ public interface EbeanServer {
    */
   int delete(Class<?> beanType, Object id, Transaction transaction);
 
+  /**
+   * Delete all the beans in the collection.
+   */
+  int deleteAll(Collection<?> beans) throws OptimisticLockException;
+
+  /**
+   * Delete all the beans in the collection using an explicit transaction.
+   */
+  int deleteAll(Collection<?> beans, Transaction transaction) throws OptimisticLockException;
+
   /**
    * Delete several beans given their type and id values.
    */
@@ -1260,11 +1288,6 @@ public interface EbeanServer {
    */
   void deleteAll(Class<?> beanType, Collection<?> ids, Transaction transaction);
 
-  /**
-   * Delete the bean with an explicit transaction.
-   */
-  void delete(Object bean, Transaction transaction) throws OptimisticLockException;
-
   /**
    * Execute a Sql Update Delete or Insert statement. This returns the number of
    * rows that where updated, deleted or inserted. If is executed in batch then

src/main/java/com/avaje/ebean/ExpressionFactory.java

@@ -36,6 +36,51 @@ import java.util.Map;
  */
 public interface ExpressionFactory {
 
+  /**
+   * Path exists - for the given path in a JSON document.
+   */
+  Expression jsonExists(String propertyName, String path);
+
+  /**
+   * Path does not exist - for the given path in a JSON document.
+   */
+  Expression jsonNotExists(String propertyName, String path);
+
+  /**
+   * Equal to - for the given path in a JSON document.
+   */
+  Expression jsonEqualTo(String propertyName, String path, Object val);
+
+  /**
+   * Not Equal to - for the given path in a JSON document.
+   */
+  Expression jsonNotEqualTo(String propertyName, String path, Object val);
+
+  /**
+   * Greater than - for the given path in a JSON document.
+   */
+  Expression jsonGreaterThan(String propertyName, String path, Object val);
+
+  /**
+   * Greater than or equal to - for the given path in a JSON document.
+   */
+  Expression jsonGreaterOrEqual(String propertyName, String path, Object val);
+
+  /**
+   * Less than - for the given path in a JSON document.
+   */
+  Expression jsonLessThan(String propertyName, String path, Object val);
+
+  /**
+   * Less than or equal to - for the given path in a JSON document.
+   */
+  Expression jsonLessOrEqualTo(String propertyName, String path, Object val);
+
+  /**
+   * Between - for the given path in a JSON document.
+   */
+  Expression jsonBetween(String propertyName, String path, Object lowerValue, Object upperValue);
+
   /**
    * Equal To - property equal to the given value.
    */

src/main/java/com/avaje/ebean/ExpressionList.java

@@ -107,6 +107,18 @@ public interface ExpressionList<T> extends Serializable {
    */
   Query<T> asOf(Timestamp asOf);
 
+  /**
+   * Execute as a delete query deleting the 'root level' beans that match the predicates
+   * in the query.
+   * <p>
+   * Note that if the query includes joins then the generated delete statement may not be
+   * optimal depending on the database platform.
+   * </p>
+   *
+   * @return the number of beans/rows that were deleted.
+   */
+  int delete();
+
   /**
    * Execute the query iterating over the results.
    * 
@@ -244,6 +256,15 @@ public interface ExpressionList<T> extends Serializable {
    */
   List<Version<T>> findVersions();
 
+  /**
+   * Return versions of a @History entity bean between the 2 timestamps.
+   * <p>
+   *   Generally this query is expected to be a find by id or unique predicates query.
+   *   It will execute the query against the history returning the versions of the bean.
+   * </p>
+   */
+  List<Version<T>> findVersionsBetween(Timestamp start, Timestamp end);
+
   /**
    * Add some filter predicate expressions to the many property.
    */
@@ -257,6 +278,24 @@ public interface ExpressionList<T> extends Serializable {
    */
   Query<T> select(String properties);
 
+  /**
+   * Set whether this query uses DISTINCT.
+   * <p>
+   * The select() clause MUST be specified when setDistinct(true) is set. The reason for this is that
+   * generally ORM queries include the "id" property and this doesn't make sense for distinct queries.
+   * </p>
+   * <pre>{@code
+   *
+   *   List<Customer> customers =
+   *       Ebean.find(Customer.class)
+   *          .setDistinct(true)
+   *          .select("name")     // only select the customer name
+   *          .findList();
+   *
+   * }</pre>
+   */
+  Query<T> setDistinct(boolean distinct);
+
   /**
    * Set the first row to fetch.
    * 
@@ -285,6 +324,13 @@ public interface ExpressionList<T> extends Serializable {
    */
   Query<T> setUseCache(boolean useCache);
 
+  /**
+   * Set to true to use the query for executing this query.
+   *
+   * @see Query#setUseQueryCache(boolean)
+   */
+  Query<T> setUseQueryCache(boolean useCache);
+
   /**
    * Add expressions to the having clause.
    * <p>
@@ -299,20 +345,136 @@ public interface ExpressionList<T> extends Serializable {
    */
   ExpressionList<T> where();
 
+  /**
+   * Path exists - for the given path in a JSON document.
+   *
+   * <pre>{@code
+   *
+   *   where().jsonExists("content", "path.other")
+   *
+   * }</pre>
+   *
+   * @param propertyName the property that holds a JSON document
+   * @param path the nested path in the JSON document in dot notation
+   */
+  ExpressionList<T> jsonExists(String propertyName, String path);
+
+  /**
+   * Path does not exist - for the given path in a JSON document.
+   *
+   * <pre>{@code
+   *
+   *   where().jsonNotExists("content", "path.other")
+   *
+   * }</pre>
+   *
+   * @param propertyName the property that holds a JSON document
+   * @param path the nested path in the JSON document in dot notation
+   */
+  ExpressionList<T> jsonNotExists(String propertyName, String path);
+
+  /**
+   * Equal to expression for the value at the given path in the JSON document.
+   *
+   * <pre>{@code
+   *
+   *   where().jsonEqualTo("content", "path.other", 34)
+   *
+   * }</pre>
+   *
+   * @param propertyName the property that holds a JSON document
+   * @param path the nested path in the JSON document in dot notation
+   * @param value the value used to test against the document path's value
+   */
+  ExpressionList<T> jsonEqualTo(String propertyName, String path, Object value);
+
+  /**
+   * Not Equal to - for the given path in a JSON document.
+   *
+   * <pre>{@code
+   *
+   *   where().jsonNotEqualTo("content", "path.other", 34)
+   *
+   * }</pre>
+   *
+   * @param propertyName the property that holds a JSON document
+   * @param path the nested path in the JSON document in dot notation
+   * @param value the value used to test against the document path's value
+   */
+  ExpressionList<T> jsonNotEqualTo(String propertyName, String path, Object value);
+
+  /**
+   * Greater than - for the given path in a JSON document.
+   *
+   * <pre>{@code
+   *
+   *   where().jsonGreaterThan("content", "path.other", 34)
+   *
+   * }</pre>
+   */
+  ExpressionList<T> jsonGreaterThan(String propertyName, String path, Object value);
+
+  /**
+   * Greater than or equal to - for the given path in a JSON document.
+   *
+   * <pre>{@code
+   *
+   *   where().jsonGreaterOrEqual("content", "path.other", 34)
+   *
+   * }</pre>
+   */
+  ExpressionList<T> jsonGreaterOrEqual(String propertyName, String path, Object value);
+
+  /**
+   * Less than - for the given path in a JSON document.
+   *
+   * <pre>{@code
+   *
+   *   where().jsonLessThan("content", "path.other", 34)
+   *
+   * }</pre>
+   */
+  ExpressionList<T> jsonLessThan(String propertyName, String path, Object value);
+
+  /**
+   * Less than or equal to - for the given path in a JSON document.
+   *
+   * <pre>{@code
+   *
+   *   where().jsonLessOrEqualTo("content", "path.other", 34)
+   *
+   * }</pre>
+   */
+  ExpressionList<T> jsonLessOrEqualTo(String propertyName, String path, Object value);
+
+  /**
+   * Between - for the given path in a JSON document.
+   *
+   * <pre>{@code
+   *
+   *   where().jsonBetween("content", "orderDate", lowerDateTime, upperDateTime)
+   *
+   * }</pre>
+   */
+  ExpressionList<T> jsonBetween(String propertyName, String path, Object lowerValue, Object upperValue);
+
   /**
    * Add an Expression to the list.
    * <p>
    * This returns the list so that add() can be chained.
    * </p>
-   * 
-   * <pre class="code">
-   * Query&lt;Customer&gt; query = Ebean.createQuery(Customer.class);
+   *
+   * <pre>{@code
+   *
+   * Query<Customer> query = Ebean.find(Customer.class);
    * query.where()
-   *     .like(&quot;name&quot;,&quot;Rob%&quot;)
-   *     .eq(&quot;status&quot;, Customer.ACTIVE);
-   * List&lt;Customer&gt; list = query.findList();
+   *     .like("name","Rob%")
+   *     .eq("status", Customer.ACTIVE);
+   *
+   * List<Customer> list = query.findList();
    * ...
-   * </pre>
+   *
+   * }</pre>
    */
   ExpressionList<T> add(Expression expr);
 
@@ -393,33 +555,36 @@ public interface ExpressionList<T> extends Serializable {
    * those options such as case insensitive etc.
    * </p>
    * 
-   * <pre class="code">
+   * <pre>{@code
+   *
    * // create an example bean and set the properties
    * // with the query parameters you want
    * Customer example = new Customer();
-   * example.setName(&quot;Rob%&quot;);
-   * example.setNotes(&quot;%something%&quot;);
+   * example.setName("Rob%");
+   * example.setNotes("%something%");
    * 
    * List&lt;Customer&gt; list = Ebean.find(Customer.class).where()
    *     // pass the bean into the where() clause
    *     .exampleLike(example)
    *     // you can add other expressions to the same query
-   *     .gt(&quot;id&quot;, 2).findList();
+   *     .gt("id", 2).findList();
    * 
-   * </pre>
+   * }</pre>
    * 
    * Similarly you can create an ExampleExpression
    * 
-   * <pre>
+   * <pre>{@code
+   *
    * Customer example = new Customer();
-   * example.setName(&quot;Rob%&quot;);
-   * example.setNotes(&quot;%something%&quot;);
+   * example.setName("Rob%");
+   * example.setNotes("%something%");
    * 
    * // create a ExampleExpression with more control
    * ExampleExpression qbe = new ExampleExpression(example, true, LikeType.EQUAL_TO).includeZeros();
    * 
-   * List&lt;Customer&gt; list = Ebean.find(Customer.class).where().add(qbe).findList();
-   * </pre>
+   * List<Customer> list = Ebean.find(Customer.class).where().add(qbe).findList();
+   *
+   * }</pre>
    */
   ExpressionList<T> exampleLike(Object example);
 
@@ -547,6 +712,14 @@ public interface ExpressionList<T> extends Serializable {
    * then they are not translated. logical property name names (not fully
    * qualified) will still be translated to their physical name.
    * </p>
+   *
+   * <h4>Example:</h4>
+   * <pre>{@code
+   *
+   *   // use a database function
+   *   raw("add_days(orderDate, 10) < ?", someDate)
+   *
+   * }</pre>
    */
   ExpressionList<T> raw(String raw, Object value);
 
@@ -571,6 +744,12 @@ public interface ExpressionList<T> extends Serializable {
    * then they are not translated. logical property name names (not fully
    * qualified) will still be translated to their physical name.
    * </p>
+   *
+   * <pre>{@code
+   *
+   *   raw("orderQty < shipQty")
+   *
+   * }</pre>
    */
   ExpressionList<T> raw(String raw);
 

src/main/java/com/avaje/ebean/Filter.java

@@ -36,7 +36,7 @@ import java.util.Set;
  *         .sort("avgTimeMicros desc")
  *         .gt("executionCount", 0)
  *         .gt("lastQueryTime", nowMinus24Hrs)
- *         .eq("autofetchTuned", true)
+ *         .eq("autoTuned", true)
  *         .maxRows(10)
  *         .filter(list);
  * 

src/main/java/com/avaje/ebean/Finder.java

@@ -0,0 +1,167 @@
+package com.avaje.ebean;
+
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+
+/**
+ * Intended to be used as a base class for 'Finder' implementations that can then
+ * be injected or used as public static fields on the associated entity bean.
+ * <p>
+ * These 'finders' are a place to organise all the finder methods for that bean type
+ * and specific finder methods are expected to be added (find by unique properties etc).
+ * </p>
+ *
+ * <h3>Testing</h3>
+ * <p>
+ *   For testing the mocki-ebean project has the ability to replace the finder implementation
+ *
+ * </p>
+ * <pre>{@code
+ *
+ * public class CustomerFinder extends Finder<Customer> {
+ *
+ *   public CustomerFinder() {
+ *     super(Customer.class);
+ *   }
+ *
+ *   // Add your customer finder methods ...
+ *
+ *   public Customer byName(String name) {
+ *     return query().eq("name", name).findUnique();
+ *   }
+ *
+ *   public List<Customer> findNew() {
+ *     return query()
+ *       .eq("status", Customer.Status.NEW)
+ *       .orderBy("name")
+ *       .findList()
+ *   }
+ * }
+ *
+ * @Entity
+ * public class Customer extends BaseModel {
+ *
+ *   public static final CustomerFinder find = new CustomerFinder();
+ *   ...
+ *
+ * }</pre>
+ */
+public class Finder<I, T> {
+
+  /**
+   * The entity bean type.
+   */
+  private final Class<T> type;
+
+  /**
+   * The name of the EbeanServer, null for the default server.
+   */
+  private final String serverName;
+
+  /**
+   * Create with the type of the entity bean.
+   *
+   * <pre>{@code
+   *
+   * public class CustomerFinder extends Finder<Customer> {
+   *
+   *   public CustomerFinder() {
+   *     super(Customer.class);
+   *   }
+   *
+   *   // ... add extra customer specific finder methods
+   * }
+   *
+   * @Entity
+   * public class Customer extends BaseModel {
+   *
+   *   public static final CustomerFinder find = new CustomerFinder();
+   *   ...
+   *
+   * }</pre>
+   */
+  public Finder(Class<T> type) {
+    this.type = type;
+    this.serverName = null;
+  }
+
+  /**
+   * Create with the type of the entity bean and specific server name.
+   */
+  public Finder(Class<T> type, String serverName) {
+    this.type = type;
+    this.serverName = serverName;
+  }
+
+  /**
+   * Return the underlying 'default' EbeanServer.
+   *
+   * <p>
+   * This provides full access to the API such as explicit transaction demarcation etc.
+   *
+   */
+  public EbeanServer db() {
+    return Ebean.getServer(serverName);
+  }
+
+  /**
+   * Return typically a different EbeanServer to the default.
+   * <p>
+   * This is equivalent to {@link Ebean#getServer(String)}
+   *
+   * @param server
+   *          The name of the EbeanServer. If this is null then the default EbeanServer is
+   *          returned.
+   */
+  public EbeanServer db(String server) {
+    return Ebean.getServer(server);
+  }
+
+  /**
+   * Creates an entity reference for this ID.
+   *
+   * <p>
+   * Equivalent to {@link EbeanServer#getReference(Class, Object)}
+   */
+  public T ref(I id) {
+    return db().getReference(type, id);
+  }
+
+  /**
+   * Retrieves an entity by ID.
+   *
+   * <p>
+   * Equivalent to {@link EbeanServer#find(Class, Object)}
+   */
+  @Nullable
+  public T byId(I id) {
+    return db().find(type, id);
+  }
+
+  /**
+   * Delete a bean by Id.
+   * <p>
+   * Equivalent to {@link EbeanServer#delete(Class, Object)}
+   */
+  public void deleteById(I id) {
+    db().delete(type, id);
+  }
+
+  /**
+   * Retrieves all entities of the given type.
+   */
+  public List<T> all() {
+    return query().findList();
+  }
+
+  /**
+   * Creates a query.
+   * <p>
+   * Equivalent to {@link EbeanServer#find(Class)}
+   */
+  public Query<T> query() {
+    return db().find(type);
+  }
+
+}

src/main/java/com/avaje/ebean/FutureList.java

@@ -2,7 +2,6 @@ package com.avaje.ebean;
 
 import javax.persistence.PersistenceException;
 import java.util.List;
-import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;

src/main/java/com/avaje/ebean/Model.java

@@ -1,5 +1,6 @@
 package com.avaje.ebean;
 
+import com.avaje.ebean.bean.EntityBean;
 import com.avaje.ebean.text.PathProperties;
 import com.avaje.ebean.util.ClassUtil;
 import org.jetbrains.annotations.Nullable;
@@ -193,7 +194,31 @@ public abstract class Model {
   public void markAsDirty() {
     db().markAsDirty(this);
   }
-  
+
+  /**
+   * Mark the property as unset or 'not loaded'.
+   * <p>
+   *   This would be used to specify a property that we did not wish to include in a stateless update.
+   * </p>
+   * <pre>{@code
+   *
+   *   // populate an entity bean from JSON or whatever
+   *   User user = ...;
+   *
+   *   // mark the email property as 'unset' so that it is not
+   *   // included in a 'stateless update'
+   *   user.markPropertyUnset("email");
+   *
+   *   user.update();
+   *
+   * }</pre>
+   *
+   * @param propertyName the name of the property on the bean to be marked as 'unset'
+   */
+  public void markPropertyUnset(String propertyName) {
+    ((EntityBean)this)._ebean_getIntercept().setPropertyLoaded(propertyName, false);
+  }
+
   /**
    * Insert or update this entity depending on its state.
    * 
@@ -441,6 +466,7 @@ public abstract class Model {
      *
      * }</pre>
      */
+    @SuppressWarnings("unchecked")
     public Find() {
       this.serverName = null;
       this.type = (Class<T>)ClassUtil.getSecondArgumentType(getClass());
@@ -835,10 +861,10 @@ public abstract class Model {
     }
 
     /**
-     * Create a query with explicit 'Autofetch' use.
+     * Create a query with explicit 'AutoTune' use.
      */
-    public Query<T> setAutofetch(boolean autofetch) {
-      return query().setAutofetch(autofetch);
+    public Query<T> setAutoTune(boolean autoTune) {
+      return query().setAutoTune(autoTune);
     }
 
     /**

src/main/java/com/avaje/ebean/OrderBy.java

@@ -28,7 +28,7 @@ public final class OrderBy<T> implements Serializable {
    * Create an empty OrderBy with no associated query.
    */
   public OrderBy() {
-    this.list = new ArrayList<Property>(2);
+    this.list = new ArrayList<Property>(3);
   }
   
   private OrderBy(List<Property> list) {
@@ -52,7 +52,7 @@ public final class OrderBy<T> implements Serializable {
    */
   public OrderBy(Query<T> query, String orderByClause) {
     this.query = query;
-    this.list = new ArrayList<Property>(2);
+    this.list = new ArrayList<Property>(3);
     parse(orderByClause);
   }
 
@@ -83,6 +83,19 @@ public final class OrderBy<T> implements Serializable {
     return query;
   }
 
+  /**
+   * Return true if the property is known to be contained in the order by clause.
+   */
+  public boolean containsProperty(String propertyName) {
+
+    for (int i = 0; i < list.size(); i++) {
+      if (propertyName.equals(list.get(i).getProperty())) {
+        return true;
+      }
+    }
+    return false;
+  }
+
   /**
    * Return a copy of this OrderBy with the path trimmed.
    */
@@ -185,6 +198,18 @@ public final class OrderBy<T> implements Serializable {
     return list.hashCode();
   }
 
+  /**
+   * Clear the orderBy removing any current order by properties.
+   * <p>
+   * This is intended to be used when some code creates a query with a
+   * 'default' order by clause and some other code may clear the 'default'
+   * order by clause and replace.
+   * </p>
+   */
+  public void clear() {
+    list.clear();
+  }
+
   /**
    * A property and its ascending descending order.
    */

src/main/java/com/avaje/ebean/PagedList.java

@@ -159,6 +159,11 @@ public interface PagedList<T> {
    */
   int getPageIndex();
 
+  /**
+   * Return the page size used for this query.
+   */
+  int getPageSize();
+
   /**
    * Return true if there is a next page.
    * <p>

src/main/java/com/avaje/ebean/Query.java

@@ -67,9 +67,9 @@ import java.util.Set;
  * ...
  * }</pre>
  * 
- * <h3>Autofetch</h3>
+ * <h3>AutoTune</h3>
  * <p>
- * Ebean has built in support for "Autofetch". This is a mechanism where a query
+ * Ebean has built in support for "AutoTune". This is a mechanism where a query
  * can be automatically tuned based on profiling information that is collected.
  * </p>
  * <p>
@@ -78,7 +78,7 @@ import java.util.Set;
  * more.
  * </p>
  * <p>
- * It is expected that Autofetch will be the default approach for many queries
+ * It is expected that AutoTune will be the default approach for many queries
  * in a system. It is possibly not as useful where the result of a query is sent
  * to a remote client or where there is some requirement for "Read Consistency"
  * guarantees.
@@ -338,23 +338,23 @@ public interface Query<T> extends Serializable {
   ExpressionFactory getExpressionFactory();
 
   /**
-   * Returns true if this query was tuned by autoFetch.
+   * Returns true if this query was tuned by autoTune.
    */
-  boolean isAutofetchTuned();
+  boolean isAutoTuned();
 
   /**
-   * Explicitly specify whether to use Autofetch for this query.
+   * Explicitly specify whether to use AutoTune for this query.
    * <p>
-   * If you do not call this method on a query the "Implicit Autofetch mode" is
-   * used to determine if Autofetch should be used for a given query.
+   * If you do not call this method on a query the "Implicit AutoTune mode" is
+   * used to determine if AutoTune should be used for a given query.
    * </p>
    * <p>
-   * Autofetch can add additional fetch paths to the query and specify which
+   * AutoTune can add additional fetch paths to the query and specify which
    * properties are included for each path. If you have explicitly defined some
-   * fetch paths Autofetch will not remove.
+   * fetch paths AutoTune will not remove them.
    * </p>
    */
-  Query<T> setAutofetch(boolean autofetch);
+  Query<T> setAutoTune(boolean autoTune);
 
   /**
    * Set the default lazy loading batch size to use.
@@ -366,6 +366,16 @@ public interface Query<T> extends Serializable {
    */
   Query<T> setLazyLoadBatchSize(int lazyLoadBatchSize);
 
+  /**
+   * Disable read auditing for this query.
+   * <p>
+   * This is intended to be used when the query is not a user initiated query and instead
+   * part of the internal processing in an application to load a cache or document store etc.
+   * In these cases we don't want the query to be part of read auditing.
+   * </p>
+   */
+  Query<T> setDisableReadAuditing();
+
   /**
    * Explicitly set a comma delimited list of the properties to fetch on the
    * 'main' root level entity bean (aka partial object). Note that '*' means all
@@ -723,12 +733,38 @@ public interface Query<T> extends Serializable {
   /**
    * Return versions of a @History entity bean.
    * <p>
+   *   Note that this query will work against view based history implementations
+   *   but not sql2011 standards based implementations that require a start and
+   *   end timestamp to be specified.
+   * </p>
+   * <p>
    *   Generally this query is expected to be a find by id or unique predicates query.
    *   It will execute the query against the history returning the versions of the bean.
    * </p>
    */
   List<Version<T>> findVersions();
 
+  /**
+   * Return versions of a @History entity bean between the 2 timestamps.
+   * <p>
+   *   Generally this query is expected to be a find by id or unique predicates query.
+   *   It will execute the query against the history returning the versions of the bean.
+   * </p>
+   */
+  List<Version<T>> findVersionsBetween(Timestamp start, Timestamp end);
+
+  /**
+   * Execute as a delete query deleting the 'root level' beans that match the predicates
+   * in the query.
+   * <p>
+   * Note that if the query includes joins then the generated delete statement may not be
+   * optimal depending on the database platform.
+   * </p>
+   *
+   * @return the number of beans/rows that were deleted.
+   */
+  int delete();
+
   /**
    * Return the count of entities this query should return.
    * <p>
@@ -1129,6 +1165,19 @@ public interface Query<T> extends Serializable {
 
   /**
    * Set whether this query uses DISTINCT.
+   * <p>
+   * The select() clause MUST be specified when setDistinct(true) is set. The reason for this is that
+   * generally ORM queries include the "id" property and this doesn't make sense for distinct queries.
+   * </p>
+   * <pre>{@code
+   *
+   *   List<Customer> customers =
+   *       Ebean.find(Customer.class)
+   *          .setDistinct(true)
+   *          .select("name")
+   *          .findList();
+   *
+   * }</pre>
    */
   Query<T> setDistinct(boolean isDistinct);
 

src/main/java/com/avaje/ebean/SqlRow.java

@@ -153,7 +153,7 @@ public interface SqlRow extends Serializable, Map<String, Object> {
   /**
    * Put all the values from t into this map.
    */
-  void putAll(Map<? extends String, ? extends Object> t);
+  void putAll(Map<? extends String, ?> t);
 
   /**
    * Return the size of the map.

src/main/java/com/avaje/ebean/Transaction.java

@@ -2,7 +2,6 @@ package com.avaje.ebean;
 
 import com.avaje.ebean.config.PersistBatch;
 
-import javax.persistence.OptimisticLockException;
 import javax.persistence.PersistenceException;
 import javax.persistence.RollbackException;
 import java.io.Closeable;
@@ -290,7 +289,7 @@ public interface Transaction extends Closeable {
    * <li>Transaction commit occurs</li>
    * </ul>
    */
-  void flushBatch() throws PersistenceException, OptimisticLockException;
+  void flushBatch() throws PersistenceException;
 
   /**
    * Return the underlying Connection object.

src/main/java/com/avaje/ebean/TxType.java

@@ -46,5 +46,5 @@ public enum TxType {
    * If there is an existing transaction throws an Exception. Method runs
    * without a transaction.
    */
-  NEVER;
+  NEVER
 }

src/main/java/com/avaje/ebean/annotation/ChangeLog.java

@@ -0,0 +1,34 @@
+package com.avaje.ebean.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Marks an entity bean as being included in the change logging.
+ */
+@Target({ElementType.TYPE})
+@Retention(RetentionPolicy.RUNTIME)
+public @interface ChangeLog {
+
+  /**
+   * Specify if inserts should be explicitly Included or Excluded.
+   * <p>
+   * If not defined explicitly then the server default behaviour defined
+   * on ServerConfig is used.
+   * </p>
+   */
+  ChangeLogInsertMode inserts() default ChangeLogInsertMode.DEFAULT;
+
+  /**
+   * When specified only include update requests that have at least one
+   * of the given properties as a dirty property.
+   * <p>
+   * This provides a way to filter requests to include in the change log such that
+   * only updates that include at least one of the given properties is included
+   * in the change log.
+   * </p>
+   */
+  String[] updatesThatInclude() default {};
+}

src/main/java/com/avaje/ebean/annotation/ChangeLogInsertMode.java

@@ -0,0 +1,22 @@
+package com.avaje.ebean.annotation;
+
+/**
+ * The mode used to determine if inserts should be included or not for a given bean type.
+ */
+public enum ChangeLogInsertMode {
+
+  /**
+   * Use the default behaviour as defined on ServerConfig.
+   */
+  DEFAULT,
+
+  /**
+   * Include inserts in the change log.
+   */
+  INCLUDE,
+
+  /**
+   * Exclude inserts in the change log.
+   */
+  EXCLUDE
+}

src/main/java/com/avaje/ebean/annotation/Index.java

@@ -10,15 +10,24 @@ import java.lang.annotation.Target;
  *
  * @author rvbiljouw
  */
-@Target({ElementType.FIELD})
+@Target({ElementType.TYPE, ElementType.FIELD})
 @Retention(RetentionPolicy.RUNTIME)
 public @interface Index {
 
   /**
-   * Name of the index
-   *
-   * @return index name
+   * Name of the index. If left blank a name is derived using the built in naming convention.
    */
-  String value() default "";
+  String name() default "";
+
+  /**
+   * If set true indicates this is a unique index.
+   */
+  boolean unique() default false;
+
+  /**
+   * When placed on the class (rather than field) you can specify the columns
+   * to include in the index in order.
+   */
+  String[] columnNames() default {};
 
 }

src/main/java/com/avaje/ebean/annotation/ReadAudit.java

@@ -0,0 +1,15 @@
+package com.avaje.ebean.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Marks an entity bean as being included in read auditing.
+ */
+@Target({ElementType.TYPE})
+@Retention(RetentionPolicy.RUNTIME)
+public @interface ReadAudit {
+
+}

src/main/java/com/avaje/ebean/bean/CallStack.java

@@ -6,7 +6,7 @@ import java.util.Arrays;
 /**
  * Represent the call stack (stack trace elements).
  * <p>
- * Used with a query to identify a CallStackQuery for AutoFetch automatic query
+ * Used with a query to identify a CallStackQuery for AutoTune automatic query
  * tuning.
  * </p>
  * <p>
@@ -26,16 +26,12 @@ public final class CallStack implements Serializable {
 
   private final StackTraceElement[] callStack;
 
-  public CallStack(StackTraceElement[] callStack) {
+  public CallStack(StackTraceElement[] callStack, int zeroHash, int pathHash) {
     this.callStack = callStack;
-    this.zeroHash = enc(callStack[0].hashCode());
-    int hc = 0;
-    for (int i = 1; i < callStack.length; i++) {
-      hc = 31 * hc + callStack[i].hashCode();
-    }
-    this.pathHash = enc(hc);
+    this.zeroHash = enc(zeroHash);
+    this.pathHash = enc(pathHash);
   }
-  
+
   public int hashCode() {
     int hc = 0;
     for (int i = 0; i < callStack.length; i++) {
@@ -87,8 +83,19 @@ public final class CallStack implements Serializable {
     return zeroHash + ":" + pathHash + ":" + callStack[0];
   }
 
+  /**
+   * Return the call stack lines appended with the given newLine string.
+   */
+  public String description(String newLine) {
+    StringBuilder sb = new StringBuilder(400);
+    for (int i = 0; i < callStack.length; i++) {
+      sb.append(callStack[i].toString()).append(newLine);
+    }
+    return sb.toString();
+  }
+
   public String getOriginKey(int queryHash) {
-    return zeroHash + "." + enc(queryHash) + "." + pathHash;
+    return enc(queryHash)+ "." + zeroHash + "." + pathHash;
   }
 
   private static final int radix = 1 << 6;

src/main/java/com/avaje/ebean/bean/EntityBeanIntercept.java

@@ -45,7 +45,7 @@ public final class EntityBeanIntercept implements Serializable {
   /**
    * The actual entity bean that 'owns' this intercept.
    */
-  private EntityBean owner;
+  private final EntityBean owner;
 
   private EntityBean embeddedOwner;
   private int embeddedOwnerIndex;
@@ -72,7 +72,7 @@ public final class EntityBeanIntercept implements Serializable {
   /**
    * Used when a bean is partially filled.
    */
-  private boolean[] loadedProps;
+  private final boolean[] loadedProps;
   
   private boolean fullyLoadedBean;
 
@@ -449,7 +449,18 @@ public final class EntityBeanIntercept implements Serializable {
   public int getPropertyLength() {
     return owner._ebean_getPropertyNames().length;
   }
-  
+
+  /**
+   * Set the loaded state of the property given it's name.
+   */
+  public void setPropertyLoaded(String propertyName, boolean loaded) {
+    int position = findProperty(propertyName);
+    if (position == -1) {
+      throw new IllegalArgumentException("Property "+propertyName+" not found");
+    }
+    loadedProps[position] = loaded;
+  }
+
   /**
    * Set the property to be treated as unloaded. Used for properties initialised in default
    * constructor.
@@ -581,7 +592,29 @@ public final class EntityBeanIntercept implements Serializable {
       }
     }
   }
-  
+
+  /**
+   * Return true if any of the given property names are dirty.
+   */
+  public boolean hasDirtyProperty(Set<String> propertyNames) {
+
+    String[] names = owner._ebean_getPropertyNames();
+    int len = getPropertyLength();
+    for (int i = 0; i < len; i++) {
+      if (changedProps != null && changedProps[i]) {
+        // the property has been changed on this bean
+        if (propertyNames.contains(names[i])) {
+          return true;
+        }
+      } else if (embeddedDirty != null && embeddedDirty[i]) {
+        if (propertyNames.contains(names[i])) {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+
   /**
    * Return a map of dirty properties with their new and old values.
    */
@@ -891,7 +924,7 @@ public final class EntityBeanIntercept implements Serializable {
     } else {
       return null;
     }
-    return (pcs == null) ? null : new PropertyChangeEvent(owner, getProperty(propertyIndex), Boolean.valueOf(oldValue), Boolean.valueOf(newValue));
+    return (pcs == null) ? null : new PropertyChangeEvent(owner, getProperty(propertyIndex), oldValue, newValue);
   }
 
   /**
@@ -906,7 +939,7 @@ public final class EntityBeanIntercept implements Serializable {
     } else {
       return null;
     }
-    return (pcs == null) ? null : new PropertyChangeEvent(owner, getProperty(propertyIndex), Integer.valueOf(oldValue), Integer.valueOf(newValue));
+    return (pcs == null) ? null : new PropertyChangeEvent(owner, getProperty(propertyIndex), oldValue, newValue);
   }
 
   /**
@@ -922,7 +955,7 @@ public final class EntityBeanIntercept implements Serializable {
       return null;
     }
     
-    return (pcs == null) ? null : new PropertyChangeEvent(owner, getProperty(propertyIndex), Long.valueOf(oldValue), Long.valueOf(newValue));
+    return (pcs == null) ? null : new PropertyChangeEvent(owner, getProperty(propertyIndex), oldValue, newValue);
   }
 
   /**
@@ -937,7 +970,7 @@ public final class EntityBeanIntercept implements Serializable {
     } else {
       return null;
     }
-    return (pcs == null) ? null : new PropertyChangeEvent(owner, getProperty(propertyIndex), Double.valueOf(oldValue), Double.valueOf(newValue));
+    return (pcs == null) ? null : new PropertyChangeEvent(owner, getProperty(propertyIndex), oldValue, newValue);
   }
 
   /**
@@ -952,7 +985,7 @@ public final class EntityBeanIntercept implements Serializable {
     } else {
       return null;
     }
-    return (pcs == null) ? null :  new PropertyChangeEvent(owner, getProperty(propertyIndex), Float.valueOf(oldValue), Float.valueOf(newValue));
+    return (pcs == null) ? null :  new PropertyChangeEvent(owner, getProperty(propertyIndex), oldValue, newValue);
   }
 
   /**
@@ -967,7 +1000,7 @@ public final class EntityBeanIntercept implements Serializable {
     } else {
       return null;
     }
-    return (pcs == null) ? null : new PropertyChangeEvent(owner, getProperty(propertyIndex), Short.valueOf(oldValue), Short.valueOf(newValue));
+    return (pcs == null) ? null : new PropertyChangeEvent(owner, getProperty(propertyIndex), oldValue, newValue);
   }
 
   /**
@@ -982,7 +1015,7 @@ public final class EntityBeanIntercept implements Serializable {
     } else {
       return null;
     }
-    return (pcs == null) ? null : new PropertyChangeEvent(owner, getProperty(propertyIndex), Character.valueOf(oldValue), Character.valueOf(newValue));
+    return (pcs == null) ? null : new PropertyChangeEvent(owner, getProperty(propertyIndex), oldValue, newValue);
   }
 
   /**
@@ -997,7 +1030,7 @@ public final class EntityBeanIntercept implements Serializable {
     } else {
       return null;
     }
-    return (pcs == null) ? null : new PropertyChangeEvent(owner, getProperty(propertyIndex), Byte.valueOf(oldValue), Byte.valueOf(newValue));
+    return (pcs == null) ? null : new PropertyChangeEvent(owner, getProperty(propertyIndex), oldValue, newValue);
   }
 
   /**

src/main/java/com/avaje/ebean/bean/NodeUsageCollector.java

@@ -1,13 +1,13 @@
 package com.avaje.ebean.bean;
 
 import java.lang.ref.WeakReference;
-import java.util.HashSet;
+import java.util.LinkedHashSet;
+import java.util.Set;
 
 /**
- * Collects profile information for a bean (or reference/proxy bean) at a given
- * AutoFetchNode.
+ * Collects profile information for a bean (or reference/proxy bean) at a given node.
  * <p>
- * The AutoFetchNode identifies the location of the bean in the object graph.
+ * The node identifies the location of the bean in the object graph.
  * </p>
  * <p>
  * It has to use a weak reference so as to ensure that it does not stop the
@@ -29,7 +29,7 @@ public final class NodeUsageCollector {
   /**
    * The properties used at this profile point.
    */
-  private final HashSet<String> used = new HashSet<String>();
+  private final Set<String> used = new LinkedHashSet<String>();
 
   /**
    * set to true if the bean is modified (setter called)
@@ -105,7 +105,7 @@ public final class NodeUsageCollector {
   /**
    * Return the set of used properties.
    */
-  public HashSet<String> getUsed() {
+  public Set<String> getUsed() {
     return used;
   }
 

src/main/java/com/avaje/ebean/bean/NodeUsageListener.java

@@ -9,7 +9,7 @@ public interface NodeUsageListener {
    * Collect node usage "profiling" information.
    * <p>
    * This is the properties that are used for a given bean in the object graph.
-   * This information is used by autoFetch to tune queries.
+   * This information is used by autoTune to tune queries.
    * </p>
    */
   void collectNodeUsage(NodeUsageCollector collector);

src/main/java/com/avaje/ebean/bean/ObjectGraphNode.java

@@ -82,6 +82,7 @@ public final class ObjectGraphNode implements Serializable {
     }
     
     ObjectGraphNode e = (ObjectGraphNode) obj;
+    //noinspection StringEquality
     return  ((e.path == path) || (e.path != null && e.path.equals(path)))
         && e.originQueryPoint.equals(originQueryPoint);
   }

src/main/java/com/avaje/ebean/bean/ObjectGraphOrigin.java

@@ -9,7 +9,7 @@ import java.io.Serializable;
  * The call stack is included so that the query can have different tuned fetches
  * for each unique call stack. For example, a query to fetch a customer could be
  * called by three different methods and each can be treated as a separate
- * origin point (and autoFetch can tune each one separately).
+ * origin point (and autoTune can tune each one separately).
  * </p>
  */
 public final class ObjectGraphOrigin implements Serializable {

src/main/java/com/avaje/ebean/bean/PersistenceContext.java

@@ -74,12 +74,12 @@ public interface PersistenceContext {
      * The bean was previously deleted from this persistence context (can't hit
      * L2 cache).
      */
-    public static WithOption DELETED = new WithOption(true);
+    public static final WithOption DELETED = new WithOption();
 
     private final boolean deleted;
     private final Object bean;
 
-    private WithOption(boolean deleted) {
+    private WithOption() {
       this.deleted = true;
       this.bean = null;
     }

src/main/java/com/avaje/ebean/cache/ServerCacheStatistics.java

@@ -40,7 +40,8 @@ public class ServerCacheStatistics {
   protected long evictByLRU;
 
   public String toString() {
-    StringBuilder sb = new StringBuilder();
+    //noinspection StringBufferReplaceableByString
+    StringBuilder sb = new StringBuilder(80);
     sb.append(cacheName);
     sb.append(" maxSize:").append(maxSize);
     sb.append(" size:").append(size);

src/main/java/com/avaje/ebean/common/BeanList.java

@@ -343,41 +343,41 @@ public final class BeanList<E> extends AbstractBeanCollection<E> implements List
     return list.remove(o);
   }
 
-  public boolean removeAll(Collection<?> c) {
+  public boolean removeAll(Collection<?> beans) {
     checkReadOnly();
     init();
     if (modifyRemoveListening) {
       boolean changed = false;
-      Iterator<?> it = c.iterator();
-      while (it.hasNext()) {
-        Object o = it.next();
-        if (list.remove(o)) {
-          modifyRemoval(o);
+      for (Object bean : beans) {
+        if (list.remove(bean)) {
+          // register this bean as having been removed
+          modifyRemoval(bean);
           changed = true;
         }
       }
       return changed;
     }
-    return list.removeAll(c);
+    return list.removeAll(beans);
   }
 
-  public boolean retainAll(Collection<?> c) {
+  public boolean retainAll(Collection<?> retainBeans) {
     checkReadOnly();
     init();
     if (modifyRemoveListening) {
       boolean changed = false;
       Iterator<E> it = list.iterator();
       while (it.hasNext()) {
-        Object o = it.next();
-        if (!c.contains(o)) {
+        Object bean = it.next();
+        if (!retainBeans.contains(bean)) {
+          // removing this bean
           it.remove();
-          modifyRemoval(o);
+          modifyRemoval(bean);
           changed = true;
         }
       }
       return changed;
     }
-    return list.retainAll(c);
+    return list.retainAll(retainBeans);
   }
 
   public E set(int index, E element) {
@@ -415,6 +415,7 @@ public final class BeanList<E> extends AbstractBeanCollection<E> implements List
 
   public <T> T[] toArray(T[] a) {
     init();
+    //noinspection SuspiciousToArrayCall
     return list.toArray(a);
   }
 

src/main/java/com/avaje/ebean/common/BeanMap.java

@@ -1,15 +1,14 @@
 package com.avaje.ebean.common;
 
-import java.util.Collection;
-import java.util.Collections;
-import java.util.Iterator;
-import java.util.LinkedHashMap;
-import java.util.Map;
-import java.util.Set;
-
 import com.avaje.ebean.bean.BeanCollectionLoader;
 import com.avaje.ebean.bean.EntityBean;
 
+import java.util.Collection;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Set;
+
 /**
  * Map capable of lazy loading.
  */
@@ -148,8 +147,7 @@ public final class BeanMap<K, E> extends AbstractBeanCollection<E> implements Ma
   public Collection<E> getActualDetails() {
     return map.values();
   }
-  
-  
+
   /**
    * Returns the map entrySet.
    * <p>
@@ -159,7 +157,6 @@ public final class BeanMap<K, E> extends AbstractBeanCollection<E> implements Ma
    */
   public Collection<?> getActualEntries() {
     return map.entrySet();
-
   }
 
   public String toString() {
@@ -195,9 +192,9 @@ public final class BeanMap<K, E> extends AbstractBeanCollection<E> implements Ma
     checkReadOnly();
     initClear();
     if (modifyRemoveListening) {
-      for (K key : map.keySet()) {
-        E o = map.remove(key);
-        modifyRemoval(o);
+      // add all beans to the removal list
+      for (E bean : map.values()) {
+        modifyRemoval(bean);
       }
     }
     map.clear();
@@ -249,27 +246,30 @@ public final class BeanMap<K, E> extends AbstractBeanCollection<E> implements Ma
     checkReadOnly();
     init();
     if (modifyListening) {
-      Object o = map.put(key, value);
-      modifyAddition(value);
-      modifyRemoval(o);
+      Object oldBean = map.put(key, value);
+      if (value != oldBean) {
+        // register the add of the new and the removal of the old
+        modifyAddition(value);
+        modifyRemoval(oldBean);
+      }
     }
     return map.put(key, value);
   }
 
   @SuppressWarnings({ "unchecked", "rawtypes" })
-  public void putAll(Map<? extends K, ? extends E> t) {
+  public void putAll(Map<? extends K, ? extends E> puts) {
     checkReadOnly();
     init();
     if (modifyListening) {
-      Iterator it = t.entrySet().iterator();
-      while (it.hasNext()) {
-        Map.Entry entry = (Map.Entry) it.next();
-        Object o = map.put((K) entry.getKey(), (E) entry.getValue());
-        modifyAddition((E) entry.getValue());
-        modifyRemoval(o);
+      for (Entry<? extends K, ? extends E> entry : puts.entrySet()) {
+        Object oldBean = map.put(entry.getKey(), entry.getValue());
+        if (entry.getValue() != oldBean) {
+          modifyAddition(entry.getValue());
+          modifyRemoval(oldBean);
+        }
       }
     }
-    map.putAll(t);
+    map.putAll(puts);
   }
 
   public E remove(Object key) {

src/main/java/com/avaje/ebean/common/BeanSet.java

@@ -192,32 +192,29 @@ public final class BeanSet<E> extends AbstractBeanCollection<E> implements Set<E
     return set.add(o);
   }
 
-  public boolean addAll(Collection<? extends E> c) {
+  public boolean addAll(Collection<? extends E> addCollection) {
     checkReadOnly();
     init();
     if (modifyAddListening) {
       boolean changed = false;
-      Iterator<? extends E> it = c.iterator();
-      while (it.hasNext()) {
-        E o = it.next();
-        if (set.add(o)) {
-          modifyAddition(o);
+      for (E bean : addCollection) {
+        if (set.add(bean)) {
+          // register the addition of the bean
+          modifyAddition(bean);
           changed = true;
         }
       }
       return changed;
     }
-    return set.addAll(c);
+    return set.addAll(addCollection);
   }
 
   public void clear() {
     checkReadOnly();
     initClear();
     if (modifyRemoveListening) {
-      Iterator<E> it = set.iterator();
-      while (it.hasNext()) {
-        E e = it.next();
-        modifyRemoval(e);
+      for (E bean : set) {
+        modifyRemoval(bean);
       }
     }
     set.clear();
@@ -262,41 +259,40 @@ public final class BeanSet<E> extends AbstractBeanCollection<E> implements Set<E
     return set.remove(o);
   }
 
-  public boolean removeAll(Collection<?> c) {
+  public boolean removeAll(Collection<?> beans) {
     checkReadOnly();
     init();
     if (modifyRemoveListening) {
       boolean changed = false;
-      Iterator<?> it = c.iterator();
-      while (it.hasNext()) {
-        Object o = it.next();
-        if (set.remove(o)) {
-          modifyRemoval(o);
+      for (Object bean : beans) {
+        if (set.remove(bean)) {
+          modifyRemoval(bean);
           changed = true;
         }
       }
       return changed;
     }
-    return set.removeAll(c);
+    return set.removeAll(beans);
   }
 
-  public boolean retainAll(Collection<?> c) {
+  public boolean retainAll(Collection<?> beans) {
     checkReadOnly();
     init();
     if (modifyRemoveListening) {
       boolean changed = false;
       Iterator<?> it = set.iterator();
       while (it.hasNext()) {
-        Object o = it.next();
-        if (!c.contains(o)) {
+        Object bean = it.next();
+        if (!beans.contains(bean)) {
+          // not retaining this bean so add it to the removal list
           it.remove();
-          modifyRemoval(o);
+          modifyRemoval(bean);
           changed = true;
         }
       }
       return changed;
     }
-    return set.retainAll(c);
+    return set.retainAll(beans);
   }
 
   public int size() {
@@ -311,6 +307,7 @@ public final class BeanSet<E> extends AbstractBeanCollection<E> implements Set<E
 
   public <T> T[] toArray(T[] a) {
     init();
+    //noinspection SuspiciousToArrayCall
     return set.toArray(a);
   }
 

src/main/java/com/avaje/ebean/common/ModifyCollection.java

@@ -40,9 +40,7 @@ class ModifyCollection<E> implements Collection<E> {
 
   public boolean addAll(Collection<? extends E> collection) {
     boolean changed = false;
-    Iterator<? extends E> it = collection.iterator();
-    while (it.hasNext()) {
-      E o = it.next();
+    for (E o : collection) {
       if (c.add(o)) {
         owner.modifyAddition(o);
         changed = true;
@@ -51,27 +49,33 @@ class ModifyCollection<E> implements Collection<E> {
     return changed;
   }
 
+  @Override
   public void clear() {
     c.clear();
   }
 
+  @Override
   public boolean contains(Object o) {
     return c.contains(o);
   }
 
+  @Override
   public boolean containsAll(Collection<?> collection) {
     return c.containsAll(collection);
   }
 
+  @Override
   public boolean isEmpty() {
     return c.isEmpty();
   }
 
+  @Override
   public Iterator<E> iterator() {
     Iterator<E> it = c.iterator();
     return new ModifyIterator<E>(owner, it);
   }
 
+  @Override
   public boolean remove(Object o) {
     if (c.remove(o)) {
       owner.modifyRemoval(o);
@@ -80,42 +84,47 @@ class ModifyCollection<E> implements Collection<E> {
     return false;
   }
 
+  @Override
   public boolean removeAll(Collection<?> collection) {
     boolean changed = false;
-    Iterator<?> it = collection.iterator();
-    while (it.hasNext()) {
-      Object o = (Object) it.next();
-      if (c.remove(o)) {
-        owner.modifyRemoval(o);
+    for (Object bean : collection) {
+      if (c.remove(bean)) {
+        owner.modifyRemoval(bean);
         changed = true;
       }
     }
     return changed;
   }
 
+  @Override
   public boolean retainAll(Collection<?> collection) {
     boolean changed = false;
     Iterator<?> it = c.iterator();
     while (it.hasNext()) {
-      Object o = (Object) it.next();
-      if (!collection.contains(o)) {
+      Object bean = it.next();
+      if (!collection.contains(bean)) {
+        // not retaining this bean so add to removals
         it.remove();
-        owner.modifyRemoval(o);
+        owner.modifyRemoval(bean);
         changed = true;
       }
     }
     return changed;
   }
 
+  @Override
   public int size() {
     return c.size();
   }
 
+  @Override
   public Object[] toArray() {
     return c.toArray();
   }
 
+  @Override
   public <T> T[] toArray(T[] a) {
+    //noinspection SuspiciousToArrayCall
     return c.toArray(a);
   }
 

src/main/java/com/avaje/ebean/common/ModifyHolder.java

@@ -58,7 +58,7 @@ class ModifyHolder<E> implements Serializable {
   void modifyRemoval(Object bean) {
     if (bean != null) {
       // If it is to be added then just remove the addition
-      if (!modifyAdditions.remove((E) bean)) {
+      if (!modifyAdditions.remove(bean)) {
         modifyDeletions.add((E) bean);
       }
     }

src/main/java/com/avaje/ebean/common/ModifyList.java

@@ -1,7 +1,6 @@
 package com.avaje.ebean.common;
 
 import java.util.Collection;
-import java.util.Iterator;
 import java.util.List;
 import java.util.ListIterator;
 
@@ -39,12 +38,10 @@ class ModifyList<E> extends ModifyCollection<E> implements List<E> {
     owner.modifyAddition(element);
   }
 
-  public boolean addAll(int index, Collection<? extends E> co) {
-    if (list.addAll(index, co)) {
-      Iterator<? extends E> it = co.iterator();
-      while (it.hasNext()) {
-        E o = it.next();
-        owner.modifyAddition(o);
+  public boolean addAll(int index, Collection<? extends E> addCollection) {
+    if (list.addAll(index, addCollection)) {
+      for (E bean : addCollection) {
+        owner.modifyAddition(bean);
       }
       return true;
     }

src/main/java/com/avaje/ebean/common/ModifyListIterator.java

@@ -67,9 +67,7 @@ class ModifyListIterator<E> implements ListIterator<E> {
   }
 
   public void set(E o) {
-    if (last == null) {
-      // in theory this is not allowed
-    } else {
+    if (last != null) {
       owner.modifyRemoval(last);
       owner.modifyAddition(o);
     }

src/main/java/com/avaje/ebean/config/AbstractNamingConvention.java

@@ -1,12 +1,10 @@
 package com.avaje.ebean.config;
 
+import com.avaje.ebean.config.dbplatform.DatabasePlatform;
+
 import javax.persistence.Inheritance;
 import javax.persistence.Table;
 
-import com.avaje.ebean.config.dbplatform.DatabasePlatform;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 /**
  * Provides some base implementation for NamingConventions.
  *
@@ -14,31 +12,39 @@ import org.slf4j.LoggerFactory;
  */
 public abstract class AbstractNamingConvention implements NamingConvention {
 
-  /** The Constant logger. */
-  private static final Logger logger = LoggerFactory.getLogger(AbstractNamingConvention.class);
-
-  /** The Constant DEFAULT_SEQ_FORMAT. */
+  /**
+   * The Constant DEFAULT_SEQ_FORMAT.
+   */
   public static final String DEFAULT_SEQ_FORMAT = "{table}_seq";
 
-  /** Sequence Format that includes the Primary Key column */
+  /**
+   * Sequence Format that includes the Primary Key column
+   */
   public static final String TABLE_PKCOLUMN_SEQ_FORMAT = "{table}_{column}_seq";
 
-  /** The catalog. */
+  /**
+   * The catalog.
+   */
   private String catalog;
 
-  /** The schema. */
+  /**
+   * The schema.
+   */
   private String schema;
 
-  /** The sequence format. */
+  /**
+   * The sequence format.
+   */
   private String sequenceFormat;
 
-  /** The database platform. */
+  /**
+   * The database platform.
+   */
   protected DatabasePlatform databasePlatform;
 
-  /** The max length of constraint names. */
-  protected int maxConstraintNameLength;
-
-  /** Used to trim off extra prefix for M2M. */
+  /**
+   * Used to trim off extra prefix for M2M.
+   */
   protected int rhsPrefixLength = 3;
 
   protected boolean useForeignKeyPrefix;
@@ -62,8 +68,7 @@ public abstract class AbstractNamingConvention implements NamingConvention {
   }
 
   /**
-   * Construct with the default sequence format ("{table}_seq") and
-   * useForeignKeyPrefix as true.
+   * Construct with the default sequence format ("{table}_seq") and useForeignKeyPrefix as true.
    */
   public AbstractNamingConvention() {
     this(DEFAULT_SEQ_FORMAT);
@@ -71,9 +76,6 @@ public abstract class AbstractNamingConvention implements NamingConvention {
 
   public void setDatabasePlatform(DatabasePlatform databasePlatform) {
     this.databasePlatform = databasePlatform;
-    this.maxConstraintNameLength = databasePlatform.getDbDdlSyntax().getMaxConstraintNameLength();
-
-    logger.trace("Using maxConstraintNameLength of " + maxConstraintNameLength);
   }
 
   public String getSequenceName(String tableName, String pkColumn) {
@@ -218,11 +220,11 @@ public abstract class AbstractNamingConvention implements NamingConvention {
     }
     buffer.append(rhsTableName);
 
-    int maxConstraintNameLength = databasePlatform.getDbDdlSyntax().getMaxConstraintNameLength();
+    int maxTableNameLength = databasePlatform.getMaxTableNameLength();
 
     // maxConstraintNameLength is used as the max table name length.
-    if (buffer.length() > maxConstraintNameLength) {
-      buffer.setLength(maxConstraintNameLength);
+    if (buffer.length() > maxTableNameLength) {
+      buffer.setLength(maxTableNameLength);
     }
 
     return new TableName(lhsTable.getCatalog(), lhsTable.getSchema(), buffer.toString());
@@ -239,7 +241,7 @@ public abstract class AbstractNamingConvention implements NamingConvention {
     if (t != null && !isEmpty(t.name())) {
       // Note: empty catalog and schema are converted to null
       // Only need to convert quoted identifiers from annotations
-      return new TableName(quoteIdentifiers(t.catalog()), quoteIdentifiers(t.schema()),  quoteIdentifiers(t.name()));
+      return new TableName(quoteIdentifiers(t.catalog()), quoteIdentifiers(t.schema()), quoteIdentifiers(t.name()));
     }
 
     // No annotation
@@ -272,10 +274,7 @@ public abstract class AbstractNamingConvention implements NamingConvention {
    * Checks string is null or empty .
    */
   protected boolean isEmpty(String s) {
-    if (s == null || s.trim().length() == 0) {
-      return true;
-    }
-    return false;
+    return s == null || s.trim().length() == 0;
   }
 
   /**

src/main/java/com/avaje/ebean/config/AutoTuneConfig.java

@@ -0,0 +1,218 @@
+package com.avaje.ebean.config;
+
+/**
+ * Defines the AutoTune behaviour for a EbeanServer.
+ */
+public class AutoTuneConfig {
+
+  private AutoTuneMode mode = AutoTuneMode.DEFAULT_ON;
+
+  private String queryTuningFile = "ebean-autotune.xml";
+
+  private boolean queryTuning;
+
+  private boolean queryTuningAddVersion;
+
+  private boolean profiling;
+
+  private String profilingFile = "ebean-profiling";
+
+  private int profilingBase = 5;
+
+  private double profilingRate = 0.01;
+
+  private int garbageCollectionWait = 100;
+  
+  private boolean skipCollectionOnShutdown;
+
+  public AutoTuneConfig() {
+  }
+
+  /**
+   * Return the name of the file that holds the query tuning information.
+   */
+  public String getQueryTuningFile() {
+    return queryTuningFile;
+  }
+
+  /**
+   * Set the name of the file that holds the query tuning information.
+   */
+  public void setQueryTuningFile(String queryTuningFile) {
+    this.queryTuningFile = queryTuningFile;
+  }
+
+  /**
+   * Return the name of the file that profiling information is written to.
+   */
+  public String getProfilingFile() {
+    return profilingFile;
+  }
+
+  /**
+   * Set the name of the file that profiling information is written to.
+   */
+  public void setProfilingFile(String profilingFile) {
+    this.profilingFile = profilingFile;
+  }
+
+  /**
+   * Return the mode used when autoTune has not been explicit defined on a
+   * query.
+   */
+  public AutoTuneMode getMode() {
+    return mode;
+  }
+
+  /**
+   * Set the mode used when autoTune has not been explicit defined on a query.
+   */
+  public void setMode(AutoTuneMode mode) {
+    this.mode = mode;
+  }
+
+  /**
+   * Return true if the queries are being tuned.
+   */
+  public boolean isQueryTuning() {
+    return queryTuning;
+  }
+
+  /**
+   * Set to true if the queries should be tuned by autoTune.
+   */
+  public void setQueryTuning(boolean queryTuning) {
+    this.queryTuning = queryTuning;
+  }
+
+  /**
+   * Return true if the version property should be added when the query is
+   * tuned.
+   * <p>
+   * If this is false then the version property will be added when profiling
+   * detects that the bean is possibly going to be modified.
+   * </p>
+   */
+  public boolean isQueryTuningAddVersion() {
+    return queryTuningAddVersion;
+  }
+
+  /**
+   * Set to true to force the version property to be always added by the query
+   * tuning.
+   * <p>
+   * If this is false then the version property will be added when profiling
+   * detects that the bean is possibly going to be modified.
+   * </p>
+   * <p>
+   * Generally this is not expected to be turned on.
+   * </p>
+   */
+  public void setQueryTuningAddVersion(boolean queryTuningAddVersion) {
+    this.queryTuningAddVersion = queryTuningAddVersion;
+  }
+
+  /**
+   * Return true if profiling information should be collected.
+   */
+  public boolean isProfiling() {
+    return profiling;
+  }
+
+  /**
+   * Set to true if profiling information should be collected.
+   * <p>
+   * The profiling information is collected and then used to generate the tuned
+   * queries for autoTune.
+   * </p>
+   */
+  public void setProfiling(boolean profiling) {
+    this.profiling = profiling;
+  }
+
+  /**
+   * Return the base number of queries to profile before changing to profile
+   * only a percentage of following queries (profileRate).
+   */
+  public int getProfilingBase() {
+    return profilingBase;
+  }
+
+  /**
+   * Set the based number of queries to profile.
+   */
+  public void setProfilingBase(int profilingBase) {
+    this.profilingBase = profilingBase;
+  }
+
+  /**
+   * Return the rate (%) of queries to be profiled after the 'base' amount of
+   * profiling.
+   */
+  public double getProfilingRate() {
+    return profilingRate;
+  }
+
+  /**
+   * Set the rate (%) of queries to be profiled after the 'base' amount of
+   * profiling.
+   */
+  public void setProfilingRate(double profilingRate) {
+    this.profilingRate = profilingRate;
+  }
+
+  /**
+   * Return the time in millis to wait after a system gc to collect profiling
+   * information.
+   * <p>
+   * The profiling information is collected on object finalise. As such we
+   * generally don't want to trigger GC (let the JVM do its thing) but on
+   * shutdown the autoTune manager will trigger System.gc() and then wait
+   * (default 100 millis) to hopefully collect profiling information -
+   * especially for short run unit tests.
+   * </p>
+   */
+  public int getGarbageCollectionWait() {
+    return garbageCollectionWait;
+  }
+
+  /**
+   * Set the time in millis to wait after a System.gc() to collect profiling information.
+   */
+  public void setGarbageCollectionWait(int garbageCollectionWait) {
+    this.garbageCollectionWait = garbageCollectionWait;
+  }
+
+  /**
+   * Return true if profiling collection should be skipped on shutdown.
+   */
+  public boolean isSkipCollectionOnShutdown() {
+    return skipCollectionOnShutdown;
+  }
+
+  /**
+   * Set to true if profiling collection should be skipped on shutdown.
+   */
+  public void setSkipCollectionOnShutdown(boolean skipCollectionOnShutdown) {
+    this.skipCollectionOnShutdown = skipCollectionOnShutdown;
+  }
+
+  /**
+   * Load the settings from the properties file.
+   */
+  public void loadSettings(PropertiesWrapper p) {
+
+    queryTuning = p.getBoolean("autoTune.queryTuning", queryTuning);
+    queryTuningAddVersion = p.getBoolean("autoTune.queryTuningAddVersion", queryTuningAddVersion);
+    queryTuningFile = p.get("autoTune.queryTuningFile", queryTuningFile);
+
+    skipCollectionOnShutdown = p.getBoolean("autoTune.skipCollectionOnShutdown", skipCollectionOnShutdown);
+    
+    mode = p.getEnum(AutoTuneMode.class, "autoTune.mode", mode);
+
+    profiling = p.getBoolean("autoTune.profiling", profiling);
+    profilingBase = p.getInt("autoTune.profilingBase", profilingBase);
+    profilingRate = p.getDouble("autoTune.profilingRate", profilingRate);
+    profilingFile = p.get("autoTune.profilingFile", profilingFile);
+  }
+}

src/main/java/com/avaje/ebean/config/AutoTuneMode.java

@@ -0,0 +1,32 @@
+package com.avaje.ebean.config;
+
+import com.avaje.ebean.Query;
+
+/**
+ * The mode for determining if AutoTune will be used for a given query when
+ * {@link Query#setAutoTune(boolean)} has not been explicitly set on a query.
+ * <p>
+ * The explicit control of {@link Query#setAutoTune(boolean)} will always take
+ * precedence. This mode is used when this has not been explicitly set on a
+ * query.
+ * </p>
+ */
+public enum AutoTuneMode {
+
+  /**
+   * Don't implicitly use AutoTune. Must explicitly turn it on.
+   */
+  DEFAULT_OFF,
+
+  /**
+   * Use AutoTune implicitly. Must explicitly turn it off.
+   */
+  DEFAULT_ON,
+
+  /**
+   * Implicitly use AutoTune if the query has not got either select() or join()
+   * defined.
+   */
+  DEFAULT_ONIFEMPTY
+
+}

src/main/java/com/avaje/ebean/config/AutofetchConfig.java

@@ -1,245 +0,0 @@
-package com.avaje.ebean.config;
-
-/**
- * Defines the Autofetch behaviour for a EbeanServer.
- */
-public class AutofetchConfig {
-
-  private AutofetchMode mode = AutofetchMode.DEFAULT_ONIFEMPTY;
-
-  private boolean queryTuning = false;
-
-  private boolean queryTuningAddVersion = false;
-
-  private boolean profiling = false;
-
-  private int profilingMin = 1;
-
-  private int profilingBase = 10;
-
-  private double profilingRate = 0.05;
-
-  private String logDirectory;
-
-  private int profileUpdateFrequency = 60;
-
-  private int garbageCollectionWait = 100;
-  
-  private boolean garbageCollectionOnShutdown;
-
-  public AutofetchConfig() {
-  }
-
-  /**
-   * Return the mode used when autofetch has not been explicit defined on a
-   * query.
-   */
-  public AutofetchMode getMode() {
-    return mode;
-  }
-
-  /**
-   * Set the mode used when autofetch has not been explicit defined on a query.
-   */
-  public void setMode(AutofetchMode mode) {
-    this.mode = mode;
-  }
-
-  /**
-   * Return true if the queries are being tuned.
-   */
-  public boolean isQueryTuning() {
-    return queryTuning;
-  }
-
-  /**
-   * Set to true if the queries should be tuned by autofetch.
-   */
-  public void setQueryTuning(boolean queryTuning) {
-    this.queryTuning = queryTuning;
-  }
-
-  /**
-   * Return true if the version property should be added when the query is
-   * tuned.
-   * <p>
-   * If this is false then the version property will be added when profiling
-   * detects that the bean is possibly going to be modified.
-   * </p>
-   */
-  public boolean isQueryTuningAddVersion() {
-    return queryTuningAddVersion;
-  }
-
-  /**
-   * Set to true to force the version property to be always added by the query
-   * tuning.
-   * <p>
-   * If this is false then the version property will be added when profiling
-   * detects that the bean is possibly going to be modified.
-   * </p>
-   */
-  public void setQueryTuningAddVersion(boolean queryTuningAddVersion) {
-    this.queryTuningAddVersion = queryTuningAddVersion;
-  }
-
-  /**
-   * Return true if profiling information should be collected.
-   */
-  public boolean isProfiling() {
-    return profiling;
-  }
-
-  /**
-   * Set to true if profiling information should be collected.
-   * <p>
-   * The profiling information is collected and then used to generate the tuned
-   * queries for autofetch.
-   * </p>
-   */
-  public void setProfiling(boolean profiling) {
-    this.profiling = profiling;
-  }
-
-  /**
-   * Return the minimum number of queries to profile before autofetch will start
-   * tuning the queries.
-   */
-  public int getProfilingMin() {
-    return profilingMin;
-  }
-
-  /**
-   * Set the minimum number of queries to profile before autofetch will start
-   * tuning the queries.
-   */
-  public void setProfilingMin(int profilingMin) {
-    this.profilingMin = profilingMin;
-  }
-
-  /**
-   * Return the base number of queries to profile before changing to profile
-   * only a percentage of following queries (profileRate).
-   */
-  public int getProfilingBase() {
-    return profilingBase;
-  }
-
-  /**
-   * Set the based number of queries to profile.
-   */
-  public void setProfilingBase(int profilingBase) {
-    this.profilingBase = profilingBase;
-  }
-
-  /**
-   * Return the rate (%) of queries to be profiled after the 'base' amount of
-   * profiling.
-   */
-  public double getProfilingRate() {
-    return profilingRate;
-  }
-
-  /**
-   * Set the rate (%) of queries to be profiled after the 'base' amount of
-   * profiling.
-   */
-  public void setProfilingRate(double profilingRate) {
-    this.profilingRate = profilingRate;
-  }
-
-  /**
-   * Return the log directory to put the autofetch log.
-   */
-  public String getLogDirectory() {
-    return logDirectory;
-  }
-
-  /**
-   * Set the directory to put the autofetch log in.
-   */
-  public void setLogDirectory(String logDirectory) {
-    this.logDirectory = logDirectory;
-  }
-
-  /**
-   * Return the frequency in seconds to update the autofetch tuned queries from
-   * the profiled information.
-   */
-  public int getProfileUpdateFrequency() {
-    return profileUpdateFrequency;
-  }
-
-  /**
-   * Set the frequency in seconds to update the autofetch tuned queries from the
-   * profiled information.
-   */
-  public void setProfileUpdateFrequency(int profileUpdateFrequency) {
-    this.profileUpdateFrequency = profileUpdateFrequency;
-  }
-
-  /**
-   * Return the time in millis to wait after a system gc to collect profiling
-   * information.
-   * <p>
-   * The profiling information is collected on object finalise. As such we
-   * generally don't want to trigger GC (let the JVM do its thing) but on
-   * shutdown the autofetch manager will trigger System.gc() and then wait
-   * (default 100 millis) to hopefully collect profiling information -
-   * especially for short run unit tests.
-   * </p>
-   */
-  public int getGarbageCollectionWait() {
-    return garbageCollectionWait;
-  }
-
-  /**
-   * Set the time in millis to wait after a System.gc() to collect profiling
-   * information.
-   */
-  public void setGarbageCollectionWait(int garbageCollectionWait) {
-    this.garbageCollectionWait = garbageCollectionWait;
-  }
-
-  
-  /**
-   * Return true if GC should be trigger on shutdown.
-   * <p>
-   * Autofetch profiling information is collected as part of garbage collection. 
-   * </p>
-   */
-  public boolean isGarbageCollectionOnShutdown() {
-    return garbageCollectionOnShutdown;
-  }
-
-  /**
-   * Set to true if you want GC to trigger on shutdown.
-   * <p>
-   *  This would be done if you want to try and collect Autofetch profiling information
-   *  on shutdown.
-   * </p>
-   */
-  public void setGarbageCollectionOnShutdown(boolean garbageCollectionOnShutdown) {
-    this.garbageCollectionOnShutdown = garbageCollectionOnShutdown;
-  }
-
-  /**
-   * Load the settings from the properties file.
-   */
-  public void loadSettings(PropertiesWrapper p) {
-
-    logDirectory = p.get("autofetch.logDirectory", logDirectory);
-    queryTuning = p.getBoolean("autofetch.querytuning", queryTuning);
-    queryTuningAddVersion = p.getBoolean("autofetch.queryTuningAddVersion", queryTuningAddVersion);
-    garbageCollectionOnShutdown = p.getBoolean("autofetch.garbageCollectionOnShutdown", garbageCollectionOnShutdown);
-    
-    profiling = p.getBoolean("autofetch.profiling", profiling);
-    mode = p.getEnum(AutofetchMode.class, "autofetch.implicitmode", mode);
-
-    profilingMin = p.getInt("autofetch.profiling.min", profilingMin);
-    profilingBase = p.getInt("autofetch.profiling.base", profilingBase);
-
-    profilingRate = p.getDouble("autofetch.profiling.rate", profilingRate);
-    profileUpdateFrequency = p.getInt("autofetch.profiling.updatefrequency", profileUpdateFrequency);
-  }
-}

src/main/java/com/avaje/ebean/config/AutofetchMode.java

@@ -1,32 +0,0 @@
-package com.avaje.ebean.config;
-
-import com.avaje.ebean.Query;
-
-/**
- * The mode for determining if Autofetch will be used for a given query when
- * {@link Query#setAutofetch(boolean)} has not been explicitly set on a query.
- * <p>
- * The explicit control of {@link Query#setAutofetch(boolean)} will always take
- * precedence. This mode is used when this has not been explicitly set on a
- * query.
- * </p>
- */
-public enum AutofetchMode {
-
-  /**
-   * Don't implicitly use Autofetch. Must explicitly turn it on.
-   */
-  DEFAULT_OFF,
-
-  /**
-   * Use Autofetch implicitly. Must explicitly turn it off.
-   */
-  DEFAULT_ON,
-
-  /**
-   * Implicitly use Autofetch if the query has not got either select() or join()
-   * defined.
-   */
-  DEFAULT_ONIFEMPTY
-
-}

src/main/java/com/avaje/ebean/config/DataSourceConfig.java

@@ -507,8 +507,7 @@ public class DataSourceConfig {
 
     String customProperties = properties.get("customProperties", null);
     if (customProperties != null && customProperties.length() > 0) {
-      Map<String, String> custProps = StringHelper.delimitedToMap(customProperties, ";", "=");
-      this.customProperties = custProps;
+      this.customProperties = StringHelper.delimitedToMap(customProperties, ";", "=");
     }
 
   }

src/main/java/com/avaje/ebean/config/DbConstraintNaming.java

@@ -0,0 +1,209 @@
+package com.avaje.ebean.config;
+
+/**
+ * Naming convention used for constraint names.
+ * <p>
+ * Note that these constraint names are trimmed in the PlatformDdl which can be overridden
+ * but provides a decent default implementation.
+ * </p>
+ */
+public class DbConstraintNaming {
+
+  /**
+   * Defines how constraint names are shortened if required based on platform limitations.
+   */
+  public interface MaxLength {
+
+    /**
+     * Truncate or shorten the constraint name to support DB platform limitations.
+     * <p>
+     * There is a default implementation of this which is used if an implementation is
+     * not specified.
+     * </p>
+     */
+    String maxLength(String constraintName, int count);
+  }
+
+  protected String pkPrefix = "pk_";
+  protected String pkSuffix = "";
+
+  protected String fkPrefix = "fk_";
+  protected String fkMiddle = "_";
+  protected String fkSuffix = "";
+
+  protected String fkIndexPrefix = "ix_";
+  protected String fkIndexMiddle = "_";
+  protected String fkIndexSuffix = "";
+
+  protected String indexPrefix = "ix_";
+  protected String indexMiddle = "_";
+  protected String indexSuffix = "";
+
+  protected String uqPrefix = "uq_";
+  protected String uqSuffix = "";
+
+  protected String ckPrefix = "ck_";
+  protected String ckSuffix = "";
+
+  protected MaxLength maxLength;
+
+  protected DbConstraintNormalise normalise;
+
+  /**
+   * Construct using default of lower case for both table and column names.
+   */
+  public DbConstraintNaming() {
+    this(true, true);
+  }
+
+  /**
+   * Construct specifying if lower case should be used (for both table and column names).
+   */
+  public DbConstraintNaming(boolean lowerCase) {
+    this(lowerCase, lowerCase);
+  }
+
+  /**
+   * Construct specifying if lower case should be used for both table and column names.
+   */
+  public DbConstraintNaming(boolean lowerCaseTableNames, boolean lowerCaseColumnNames) {
+    this.normalise = new DbConstraintNormalise(lowerCaseTableNames, lowerCaseColumnNames);
+  }
+
+  /**
+   * Return the MaxLength implementation used to truncate/shorten db constraint names as necessary.
+   */
+  public MaxLength getMaxLength() {
+    return maxLength;
+  }
+
+  /**
+   * Set the MaxLength implementation used to truncate/shorten db constraint names as necessary.
+   */
+  public void setMaxLength(MaxLength maxLength) {
+    this.maxLength = maxLength;
+  }
+
+  /**
+   * Return the primary key constraint name.
+   */
+  public String primaryKeyName(String tableName) {
+
+    return pkPrefix + normaliseTable(tableName) + pkSuffix;
+  }
+
+  /**
+   * Return the foreign key constraint name given a single column foreign key.
+   */
+  public String foreignKeyConstraintName(String tableName, String columnName) {
+    return fkPrefix + normaliseTable(tableName) + fkMiddle + normaliseColumn(columnName) + fkSuffix;
+  }
+
+  /**
+   * Return the index name associated with a foreign key constraint given multiple columns.
+   */
+  public String foreignKeyIndexName(String tableName, String[] columns) {
+
+    String colPart = joinColumnNames(columns);
+    return fkIndexPrefix + normaliseTable(tableName) + fkIndexMiddle + colPart + fkIndexSuffix;
+  }
+
+  /**
+   * Return the index name associated with a foreign key constraint given a single column foreign key.
+   */
+  public String foreignKeyIndexName(String tableName, String column) {
+
+    String colPart = normaliseTable(column);
+    return fkIndexPrefix + normaliseTable(tableName) + fkIndexMiddle + colPart + fkIndexSuffix;
+  }
+
+  /**
+   * Return the index name for a general index (not associated with a foreign key).
+   */
+  public String indexName(String tableName, String column) {
+
+    String colPart = normaliseTable(column);
+    return indexPrefix + normaliseTable(tableName) + indexMiddle + colPart + indexSuffix;
+  }
+
+  /**
+   * Return the index name for a general index (not associated with a foreign key).
+   */
+  public String indexName(String tableName, String[] columns) {
+
+    String colPart = joinColumnNames(columns);
+    return indexPrefix + normaliseTable(tableName) + indexMiddle + colPart + indexSuffix;
+  }
+
+  /**
+   * Join the column names together with underscores.
+   */
+  protected String joinColumnNames(String[] columns) {
+
+    if (columns.length == 1) {
+      return normaliseColumn(columns[0]);
+    }
+    StringBuilder sb = new StringBuilder();
+    for (int i = 0; i < columns.length; i++) {
+      if (i > 0) {
+        sb.append("_");
+      }
+      sb.append(normaliseColumn(columns[i]));
+    }
+    return sb.toString();
+  }
+
+  /**
+   * Return the unique constraint name.
+   */
+  public String uniqueConstraintName(String tableName, String columnName) {
+
+    return uqPrefix + normaliseTable(tableName) + "_" + normaliseColumn(columnName) + uqSuffix;
+  }
+
+  /**
+   * Return the unique constraint name.
+   */
+  public String uniqueConstraintName(String tableName, String[] columns) {
+
+    String colPart = joinColumnNames(columns);
+    return uqPrefix + normaliseTable(tableName) + "_" + colPart + uqSuffix;
+  }
+
+  /**
+   * Return the check constraint name.
+   */
+  public String checkConstraintName(String tableName, String columnName) {
+
+    return ckPrefix + normaliseTable(tableName) + "_" + normaliseColumn(columnName) + ckSuffix;
+  }
+
+  /**
+   * Normalise the table name by trimming catalog and schema and removing any
+   * quoted identifier characters (",',[,] etc).
+   */
+  public String normaliseTable(String tableName) {
+    return normalise.normaliseTable(tableName);
+  }
+
+  /**
+   * Normalise the column name by removing any quoted identifier characters (",',[,] etc).
+   */
+  public String normaliseColumn(String tableName) {
+    return normalise.normaliseColumn(tableName);
+  }
+
+  /**
+   * Lower case the table name checking for quoted identifiers.
+   */
+  public String lowerTableName(String tableName) {
+    return normalise.lowerTableName(tableName);
+  }
+
+  /**
+   * Lower case the column name checking for quoted identifiers.
+   */
+  public String lowerColumnName(String name) {
+    return normalise.lowerColumnName(name);
+  }
+}

src/main/java/com/avaje/ebean/config/DbConstraintNormalise.java

@@ -0,0 +1,105 @@
+package com.avaje.ebean.config;
+
+/**
+ * Used to normalise table and column names which means stripping out
+ * quoted identifier characters and any catalog or schema prefix.
+ */
+public class DbConstraintNormalise {
+
+  protected final String[] quotedIdentifiers;
+
+  protected final boolean lowerCaseTables;
+
+  protected final boolean lowerCaseColumns;
+
+  public DbConstraintNormalise() {
+    this(true, true);
+  }
+
+  public DbConstraintNormalise(boolean lowerCaseTables, boolean lowerCaseColumns) {
+    this.lowerCaseTables = lowerCaseTables;
+    this.lowerCaseColumns = lowerCaseColumns;
+    this.quotedIdentifiers = new String[]{"\"", "'", "[", "]", "`"};
+  }
+
+  /**
+   * Normalise the table name by trimming catalog and schema and removing any
+   * quoted identifier characters (",',[,] etc).
+   */
+  public String normaliseTable(String tableName) {
+
+    tableName = trimQuotes(tableName);
+    int lastPeriod = tableName.lastIndexOf('.');
+    if (lastPeriod > -1) {
+      // trim off catalog and schema prefix
+      tableName = tableName.substring(lastPeriod + 1);
+    }
+    if (lowerCaseTables) {
+      tableName = tableName.toLowerCase();
+    }
+    return tableName;
+  }
+
+  /**
+   * Normalise the column name by removing any quoted identifier characters.
+   */
+  public String normaliseColumn(String columnName) {
+
+    columnName = trimQuotes(columnName);
+    if (lowerCaseColumns) {
+      columnName = columnName.toLowerCase();
+    }
+    return columnName;
+  }
+
+  /**
+   * Lower case the table name checking for quoted identifiers.
+   */
+  public String lowerTableName(String tableName) {
+    if (lowerCaseTables && notQuoted(tableName)) {
+      return tableName.toLowerCase();
+    }
+    return tableName;
+  }
+
+  /**
+   * Lower case the column name checking for quoted identifiers.
+   */
+  public String lowerColumnName(String name) {
+    if (lowerCaseColumns && notQuoted(name)) {
+      return name.toLowerCase();
+    }
+    return name;
+  }
+
+  /**
+   * Trim off the platform quoted identifier quotes like [ ' and ".
+   */
+  public boolean notQuoted(String tableName) {
+
+    // remove quoted identifier characters
+    for (int i = 0; i < quotedIdentifiers.length; i++) {
+      if (tableName.contains(quotedIdentifiers[i])) {
+        return false;
+      }
+    }
+    return true;
+  }
+
+  /**
+   * Trim off the platform quoted identifier quotes like [ ' and ".
+   */
+  public String trimQuotes(String tableName) {
+
+    if (tableName == null) {
+      return "";
+    }
+    // remove quoted identifier characters
+    for (int i = 0; i < quotedIdentifiers.length; i++) {
+      tableName = tableName.replace(quotedIdentifiers[i], "");
+    }
+    return tableName;
+  }
+
+
+}

src/main/java/com/avaje/ebean/config/DbMigrationConfig.java

@@ -0,0 +1,39 @@
+package com.avaje.ebean.config;
+
+/**
+ * Configuration for the DB migration processing.
+ */
+public class DbMigrationConfig {
+
+  /**
+   * Resource path for the migration xml and sql.
+   * Typically you would change 'app' to be a better/more unique.
+   */
+  private String resourcePath = "dbmigration/app";
+
+  /**
+   * Return the resource path for db migrations.
+   */
+  public String getResourcePath() {
+    return resourcePath;
+  }
+
+  /**
+   * Set the resource path for db migrations.
+   * <p>
+   * Typically this would be something like "dbmigration/myapp" where myapp gives it a
+   * unique resource path in the case there are multiple EbeanServer applications in the
+   * single classpath.
+   * </p>
+   */
+  public void setResourcePath(String resourcePath) {
+    this.resourcePath = resourcePath;
+  }
+
+  /**
+   * Load the settings from the PropertiesWrapper.
+   */
+  public void loadSettings(PropertiesWrapper properties) {
+    resourcePath = properties.get("migration.resourcePath", resourcePath);
+  }
+}

src/main/java/com/avaje/ebean/config/NamingConvention.java

@@ -82,8 +82,7 @@ public interface NamingConvention {
   String getPropertyFromColumn(Class<?> beanClass, String dbColumnName);
 
   /**
-   * Return the sequence name given the table name (for DB's that use
-   * sequences).
+   * Return the sequence name given the table name (for DB's that use sequences).
    * <p>
    * Typically you might append "_seq" to the table name as an example.
    * </p>
@@ -99,14 +98,14 @@ public interface NamingConvention {
    * Return true if a prefix should be used building a foreign key name.
    * <p>
    * This by default is true and this works well when the primary key column
-   * names are simply "ID". In this case a prefix (such as "ORDER" and
-   * "CUSTOMER" etc) is added to the foreign key column producing "ORDER_ID" and
-   * "CUSTOMER_ID".
+   * names are simply "id". In this case a prefix (such as "order" and
+   * "customer" etc) is added to the foreign key column producing "order_id" and
+   * "customer_id".
    * </p>
    * <p>
    * This should return false when your primary key columns are the same as the
    * foreign key columns. For example, when the primary key columns are
-   * "ORDER_ID", "CUST_ID" etc ... and they are the same as the foreign key
+   * "order_id", "cust_id" etc ... and they are the same as the foreign key
    * column names.
    * </p>
    */

src/main/java/com/avaje/ebean/config/PersistBatch.java

@@ -36,7 +36,7 @@ public enum PersistBatch {
   INHERIT(false);
 
 
-  boolean forInsert;
+  final boolean forInsert;
 
   PersistBatch(boolean forInsert) {
     this.forInsert = forInsert;

src/main/java/com/avaje/ebean/config/PropertyExpression.java

@@ -27,12 +27,12 @@ final class PropertyExpression {
   /**
    * Used to detect the start of an expression.
    */
-  private static String START = "${";
+  private static final String START = "${";
 
   /**
    * Used to detect the end of an expression.
    */
-  private static String END = "}";
+  private static final String END = "}";
 
   /**
    * Specify the PropertyHolder.
@@ -144,13 +144,7 @@ final class PropertyExpression {
   }
 
   private static boolean isJndiExpression(String exp) {
-    if (exp.startsWith("JNDI:")) {
-      return true;
-    }
-    if (exp.startsWith("jndi:")) {
-      return true;
-    }
-    return false;
+    return exp.startsWith("JNDI:") || exp.startsWith("jndi:");
   }
 
   /**

src/main/java/com/avaje/ebean/config/PropertyMap.java

@@ -16,7 +16,15 @@ public final class PropertyMap implements Serializable {
 
   private static final long serialVersionUID = 1L;
 
-  private LinkedHashMap<String, String> map = new LinkedHashMap<String, String>();
+  private final LinkedHashMap<String, String> map = new LinkedHashMap<String, String>();
+
+  /**
+   * Return properties loaded from test-ebean.properties.
+   */
+  public static Properties testProperties() {
+    PropertyMap propertyMap = PropertyMapLoader.loadTestProperties();
+    return (propertyMap == null) ? new Properties() : propertyMap.asProperties();
+  }
 
   public static Properties defaultProperties() {
     PropertyMap propertyMap = PropertyMapLoader.loadGlobalProperties();

src/main/java/com/avaje/ebean/config/PropertyMapLoader.java

@@ -14,17 +14,34 @@ final class PropertyMapLoader {
 
   private static final Logger logger = LoggerFactory.getLogger(PropertyMapLoader.class);
 
+  /**
+   * Load the <code>test-ebean.properties</code>.
+   */
+  public static PropertyMap loadTestProperties() {
+    return load(null, "test-ebean.properties", false);
+  }
+
+  /**
+   * Load the ebean.properties (and test-ebean.properties if present).
+   */
   public static PropertyMap loadGlobalProperties() {
 
+    boolean loadTestProperties = false;
     String fileName = System.getenv("EBEAN_PROPS_FILE");
     if (fileName == null) {
       fileName = System.getProperty("ebean.props.file");
       if (fileName == null) {
+        loadTestProperties = true;
         fileName = "ebean.properties";
       }
     }
 
-    return load(null, fileName);
+    PropertyMap map = load(null, fileName, true);
+    if (loadTestProperties) {
+      // load test properties if present in classpath
+      load(map, "test-ebean.properties", false);
+    }
+    return map;
   }
 
   /**
@@ -35,11 +52,13 @@ final class PropertyMapLoader {
    * @param fileName
    *          the name of the properties file to load.
    */
-  public static PropertyMap load(PropertyMap p, String fileName) {
+  public static PropertyMap load(PropertyMap p, String fileName, boolean errorOnNull) {
 
     InputStream is = findInputStream(fileName);
     if (is == null) {
-      logger.error(fileName + " not found");
+      if (errorOnNull) {
+        logger.error(fileName + " not found");
+      }
       return p;
     } else {
       return load(p, is);

src/main/java/com/avaje/ebean/config/PstmtDelegate.java

@@ -1,24 +0,0 @@
-package com.avaje.ebean.config;
-
-import java.sql.PreparedStatement;
-
-/**
- * Unwrap the PreparedStatement to get the specific underlying implementation.
- * <p>
- * This is used to handle specific JDBC driver issues. Typically this means
- * getting the OraclePreparedStatement to handle Oracle specific issues etc.
- * </p>
- * 
- * @author rbygrave
- */
-public interface PstmtDelegate {
-
-  /**
-   * Unwrap the PreparedStatement to get the specific underlying implementation.
-   * 
-   * @param pstmt
-   *          the PreparedStatement coming out of the connection pool
-   * @return the underlying PreparedStatement
-   */
-  PreparedStatement unwrap(PreparedStatement pstmt);
-}

src/main/java/com/avaje/ebean/config/ServerConfig.java

@@ -8,6 +8,11 @@ import com.avaje.ebean.cache.ServerCacheManager;
 import com.avaje.ebean.config.dbplatform.DatabasePlatform;
 import com.avaje.ebean.config.dbplatform.DbEncrypt;
 import com.avaje.ebean.event.*;
+import com.avaje.ebean.event.changelog.ChangeLogListener;
+import com.avaje.ebean.event.changelog.ChangeLogPrepare;
+import com.avaje.ebean.event.changelog.ChangeLogRegister;
+import com.avaje.ebean.event.readaudit.ReadAuditLogger;
+import com.avaje.ebean.event.readaudit.ReadAuditPrepare;
 import com.avaje.ebean.meta.MetaInfoManager;
 import com.avaje.ebean.util.ClassUtil;
 import com.fasterxml.jackson.core.JsonFactory;
@@ -70,6 +75,11 @@ public class ServerConfig {
 
   private ContainerConfig containerConfig;
 
+  /**
+   * The underlying properties that were used during configuration.
+   */
+  private Properties properties;
+
   /**
    * The resource directory.
    */
@@ -120,9 +130,9 @@ public class ServerConfig {
   private CurrentUserProvider currentUserProvider;
 
   /** 
-   * Config controlling the autofetch behaviour.
+   * Config controlling the AutoTune behaviour.
    */
-  private AutofetchConfig autofetchConfig = new AutofetchConfig();
+  private AutoTuneConfig autoTuneConfig = new AutoTuneConfig();
 
   /**
    * The JSON format used for DateTime types. Default to millis.
@@ -162,6 +172,12 @@ public class ServerConfig {
    */
   private String asOfSysPeriod = "sys_period";
 
+  /**
+   * Suffix appended to the base table to derive the view that contains the union
+   * of the base table and the history table in order to support asOf queries.
+   */
+  private String historyTableSuffix = "_history";
+
   /**
    * Use for transaction scoped batch mode.
    */
@@ -198,11 +214,6 @@ public class ServerConfig {
   private ExternalTransactionManager externalTransactionManager;
 
   /**
-   * Used to unwrap PreparedStatements to perform JDBC Driver specific functions
-   */
-  private PstmtDelegate pstmtDelegate;
-
-  /** 
    * The data source (if programmatically provided). 
    */
   private DataSource dataSource;
@@ -212,13 +223,23 @@ public class ServerConfig {
    */
   private DataSourceConfig dataSourceConfig = new DataSourceConfig();
 
+  /**
+   * The db migration config (migration resource path etc).
+   */
+  private DbMigrationConfig migrationConfig = new DbMigrationConfig();
+
   /**
    * Set to true if the DataSource uses autoCommit.
    * <p>
    * Indicates that Ebean should use autoCommit friendly Transactions and TransactionManager.
    */
   private boolean autoCommitMode;
-  
+
+  /**
+   * Set to true if transaction begin should be started with explicit statement.
+   */
+  private boolean explicitTransactionBeginMode;
+
   /** 
    * The data source JNDI name if using a JNDI DataSource. 
    */
@@ -239,6 +260,11 @@ public class ServerConfig {
    */
   private NamingConvention namingConvention = new UnderscoreNamingConvention();
 
+  /**
+   * Naming convention used in DDL generation for primary keys, foreign keys etc.
+   */
+  private DbConstraintNaming constraintNaming = new DbConstraintNaming();
+
   /** 
    * Behaviour of update to include on the change properties. 
    */
@@ -255,19 +281,35 @@ public class ServerConfig {
   private boolean updatesDeleteMissingChildren = true;
   
   /**
-   * Setting to indicate if UUID should be stored as binary(16) or varchar(40).
+   * Setting to indicate if UUID should be stored as binary(16) or varchar(40) or native DB type (for H2 and Postgres).
    */
-  private boolean uuidStoreAsBinary;
+  private DbUuid dbUuid = DbUuid.AUTO;
 
 
   private List<BeanFindController> findControllers = new ArrayList<BeanFindController>();
   private List<BeanPersistController> persistControllers = new ArrayList<BeanPersistController>();
+  private List<BeanPostLoad> postLoaders = new ArrayList<BeanPostLoad>();
   private List<BeanPersistListener> persistListeners = new ArrayList<BeanPersistListener>();
   private List<BeanQueryAdapter> queryAdapters = new ArrayList<BeanQueryAdapter>();
   private List<BulkTableEventListener> bulkTableEventListeners = new ArrayList<BulkTableEventListener>();
   private List<ServerConfigStartup> configStartupListeners = new ArrayList<ServerConfigStartup>();
   private List<TransactionEventListener> transactionEventListeners = new ArrayList<TransactionEventListener>();
 
+  /**
+   * By default inserts are included in the change log.
+   */
+  private boolean changeLogIncludeInserts = true;
+
+  private ChangeLogPrepare changeLogPrepare;
+
+  private ChangeLogListener changeLogListener;
+
+  private ChangeLogRegister changeLogRegister;
+
+  private ReadAuditLogger readAuditLogger;
+
+  private ReadAuditPrepare readAuditPrepare;
+
   private EncryptKeyManager encryptKeyManager;
 
   private EncryptDeployManager encryptDeployManager;
@@ -322,7 +364,6 @@ public class ServerConfig {
   private int queryCacheMaxIdleTime = 600;
   private int queryCacheMaxTimeToLive = 60*60*6;
   private Object objectMapper;
-  private boolean diffFlatMode;
 
   /**
    * Set to true if you want eq("someProperty", null) to generate 1=1 rather than "is null" sql expression.
@@ -506,7 +547,7 @@ public class ServerConfig {
   /**
    * Return the JDBC batch mode to use per save(), delete(), insert() or update() request.
    * <p>
-   * This makes sense when a save() or delete() etc cascades and executes multiple child statements. The best caase
+   * This makes sense when a save() or delete() cascades and executes multiple child statements. The best case
    * for this is when saving a master/parent bean this cascade inserts many detail/child beans.
    * </p>
    * <p>
@@ -624,6 +665,125 @@ public class ServerConfig {
     this.databaseSequenceBatchSize = databaseSequenceBatchSize;
   }
 
+  /**
+   * Return the ChangeLogPrepare.
+   * <p>
+   *   This is used to set user context information to the ChangeSet in the
+   *   foreground thread prior to the logging occurring in a background thread.
+   * </p>
+   */
+  public ChangeLogPrepare getChangeLogPrepare() {
+    return changeLogPrepare;
+  }
+
+  /**
+   * Set the ChangeLogPrepare.
+   * <p>
+   *   This is used to set user context information to the ChangeSet in the
+   *   foreground thread prior to the logging occurring in a background thread.
+   * </p>
+   */
+  public void setChangeLogPrepare(ChangeLogPrepare changeLogPrepare) {
+    this.changeLogPrepare = changeLogPrepare;
+  }
+
+  /**
+   * Return the ChangeLogListener which actually performs the logging of change sets
+   * in the background.
+   */
+  public ChangeLogListener getChangeLogListener() {
+    return changeLogListener;
+  }
+
+  /**
+   * Set the ChangeLogListener which actually performs the logging of change sets
+   * in the background.
+   */
+  public void setChangeLogListener(ChangeLogListener changeLogListener) {
+    this.changeLogListener = changeLogListener;
+  }
+
+  /**
+   * Return the ChangeLogRegister which controls which ChangeLogFilter is used for each
+   * bean type and in this way provide fine grained control over which persist requests
+   * are included in the change log.
+   */
+  public ChangeLogRegister getChangeLogRegister() {
+    return changeLogRegister;
+  }
+
+  /**
+   * Set the ChangeLogRegister which controls which ChangeLogFilter is used for each
+   * bean type and in this way provide fine grained control over which persist requests
+   * are included in the change log.
+   */
+  public void setChangeLogRegister(ChangeLogRegister changeLogRegister) {
+    this.changeLogRegister = changeLogRegister;
+  }
+
+  /**
+   * Return true if inserts should be included in the change log by default.
+   */
+  public boolean isChangeLogIncludeInserts() {
+    return changeLogIncludeInserts;
+  }
+
+  /**
+   * Set if inserts should be included in the change log by default.
+   */
+  public void setChangeLogIncludeInserts(boolean changeLogIncludeInserts) {
+    this.changeLogIncludeInserts = changeLogIncludeInserts;
+  }
+
+  /**
+   * Return the ReadAuditLogger to use.
+   */
+  public ReadAuditLogger getReadAuditLogger() {
+    return readAuditLogger;
+  }
+
+  /**
+   * Set the ReadAuditLogger to use. If not set the default implementation is used
+   * which logs the read events in JSON format to a standard named SLF4J logger
+   * (which can be configured in say logback to log to a separate log file).
+   */
+  public void setReadAuditLogger(ReadAuditLogger readAuditLogger) {
+    this.readAuditLogger = readAuditLogger;
+  }
+
+  /**
+   * Return the ReadAuditPrepare to use.
+   */
+  public ReadAuditPrepare getReadAuditPrepare() {
+    return readAuditPrepare;
+  }
+
+  /**
+   * Set the ReadAuditPrepare to use.
+   * <p>
+   * It is expected that an implementation is used that read user context information
+   * (user id, user ip address etc) and sets it on the ReadEvent bean before it is sent
+   * to the ReadAuditLogger.
+   * </p>
+   */
+  public void setReadAuditPrepare(ReadAuditPrepare readAuditPrepare) {
+    this.readAuditPrepare = readAuditPrepare;
+  }
+
+  /**
+   * Return the DB migration configuration.
+   */
+  public DbMigrationConfig getMigrationConfig() {
+    return migrationConfig;
+  }
+
+  /**
+   * Set the DB migration configuration.
+   */
+  public void setMigrationConfig(DbMigrationConfig migrationConfig) {
+    this.migrationConfig = migrationConfig;
+  }
+
   /**
    * Return the suffix appended to the base table to derive the view that contains the union
    * of the base table and the history table in order to support asOf queries.
@@ -656,6 +816,20 @@ public class ServerConfig {
     this.asOfSysPeriod = asOfSysPeriod;
   }
 
+  /**
+   * Return the history table suffix (defaults to _history).
+   */
+  public String getHistoryTableSuffix() {
+    return historyTableSuffix;
+  }
+
+  /**
+   * Set the history table suffix.
+   */
+  public void setHistoryTableSuffix(String historyTableSuffix) {
+    this.historyTableSuffix = historyTableSuffix;
+  }
+
   /**
    * Return true if we are running in a JTA Transaction manager.
    */
@@ -961,35 +1135,31 @@ public class ServerConfig {
   }
 
   /**
-   * Return the configuration for the Autofetch feature.
+   * Return the constraint naming convention used in DDL generation.
    */
-  public AutofetchConfig getAutofetchConfig() {
-    return autofetchConfig;
+  public DbConstraintNaming getConstraintNaming() {
+    return constraintNaming;
   }
 
   /**
-   * Set the configuration for the Autofetch feature.
+   * Set the constraint naming convention used in DDL generation.
    */
-  public void setAutofetchConfig(AutofetchConfig autofetchConfig) {
-    this.autofetchConfig = autofetchConfig;
+  public void setConstraintNaming(DbConstraintNaming constraintNaming) {
+    this.constraintNaming = constraintNaming;
   }
 
   /**
-   * Return the PreparedStatementDelegate.
+   * Return the configuration for AutoTune.
    */
-  public PstmtDelegate getPstmtDelegate() {
-    return pstmtDelegate;
+  public AutoTuneConfig getAutoTuneConfig() {
+    return autoTuneConfig;
   }
 
   /**
-   * Set the PstmtDelegate which can be used to support JDBC driver specific
-   * features.
-   * <p>
-   * Typically this means Oracle JDBC driver specific workarounds.
-   * </p>
+   * Set the configuration for AutoTune.
    */
-  public void setPstmtDelegate(PstmtDelegate pstmtDelegate) {
-    this.pstmtDelegate = pstmtDelegate;
+  public void setAutoTuneConfig(AutoTuneConfig autoTuneConfig) {
+    this.autoTuneConfig = autoTuneConfig;
   }
 
   /**
@@ -1055,6 +1225,28 @@ public class ServerConfig {
     this.autoCommitMode = autoCommitMode;
   }
 
+  /**
+   * Return true if transaction begin should be started with explicit statement.
+   */
+  public boolean isExplicitTransactionBeginMode() {
+    return explicitTransactionBeginMode;
+  }
+
+  /**
+   * Set to true if transaction begin should be started with explicit statement.
+   * <p>
+   * This works for H2 and Postgres but not for Oracle - only use this if you first name
+   * is Daryl or you have explicitly talked to Rob about this feature.
+   * </p>
+   * <p>
+   * This is generally not expected to be turned on but instead allow transactions to start
+   * implicitly which is generally the standard approach.
+   * </p>
+   */
+  public void setExplicitTransactionBeginMode(boolean explicitTransactionBeginMode) {
+    this.explicitTransactionBeginMode = explicitTransactionBeginMode;
+  }
+
   /**
    * Return a value used to represent TRUE in the database.
    * <p>
@@ -1274,19 +1466,18 @@ public class ServerConfig {
     this.dbEncrypt = dbEncrypt;
   }
 
-  
   /**
-   * Return true if UUID should be stored as binary(16) (as opposed to varchar(40)).
+   * Return the DB type used to store UUID.
    */
-  public boolean isUuidStoreAsBinary() {
-    return uuidStoreAsBinary;
+  public DbUuid getDbUuid() {
+    return dbUuid;
   }
 
   /**
-   * Set to true if UUID should be stored as binary(16) (as opposed to varchar(40)).
+   * Set the DB type used to store UUID.
    */
-  public void setUuidStoreAsBinary(boolean uuidStoreAsBinary) {
-    this.uuidStoreAsBinary = uuidStoreAsBinary;
+  public void setDbUuid(DbUuid dbUuid) {
+    this.dbUuid = dbUuid;
   }
 
   /**
@@ -1660,14 +1851,45 @@ public class ServerConfig {
     persistControllers.add(beanPersistController);
   }
 
+  /**
+   * Register a BeanPostLoad instance.
+   * <p>
+   * Note alternatively you can use {@link #setPostLoaders(List)} to set
+   * all the BeanPostLoad instances.
+   * </p>
+   */
+  public void add(BeanPostLoad postLoad) {
+    postLoaders.add(postLoad);
+  }
+
+  /**
+   * Return the list of BeanFindController instances.
+   */
   public List<BeanFindController> getFindControllers() {
     return findControllers;
   }
 
+  /**
+   * Set the list of BeanFindController instances.
+   */
   public void setFindControllers(List<BeanFindController> findControllers) {
     this.findControllers = findControllers;
   }
 
+  /**
+   * Return the list of BeanPostLoader instances.
+   */
+  public List<BeanPostLoad> getPostLoaders() {
+    return postLoaders;
+  }
+
+  /**
+   * Set the list of BeanPostLoader instances.
+   */
+  public void setPostLoaders(List<BeanPostLoad> postLoaders) {
+    this.postLoaders = postLoaders;
+  }
+
   /**
    * Return the BeanPersistController instances.
    */
@@ -1812,14 +2034,40 @@ public class ServerConfig {
    * Load the settings from the given properties
    */
   public void loadFromProperties(Properties properties) {
+    // keep the properties used for configuration so that these are available for plugins
+    this.properties = properties;
     PropertiesWrapper p = new PropertiesWrapper("ebean", name, properties);
     loadSettings(p);
   }
 
+  /**
+   * Load settings from test-ebean.properties and do nothing if the properties is not found.
+   * <p>
+   * This is typically used when test-ebean.properties is put into the test class path and used
+   * to configure Ebean for running tests.
+   * </p>
+   */
+  public void loadTestProperties() {
+    Properties properties = PropertyMap.testProperties();
+    if (!properties.isEmpty()) {
+      PropertiesWrapper p = new PropertiesWrapper("ebean", name, properties);
+      loadSettings(p);
+    }
+  }
+
+  /**
+   * Return the properties that we used for configuration and were set via a call to loadFromProperties().
+   */
+  public Properties getProperties() {
+    return properties;
+  }
 
   @SuppressWarnings("unchecked")
-  private <T> T createInstance(PropertiesWrapper p, Class<T> pluginType, String key) {
+  private <T> T createInstance(PropertiesWrapper p, Class<T> pluginType, String key, T instance) {
 
+    if (instance != null) {
+      return instance;
+    }
     String classname = p.get(key, null);
     return classname == null ? null : (T) ClassUtil.newInstance(classname);
   }
@@ -1838,8 +2086,8 @@ public class ServerConfig {
   /**
    * This is broken out for the same reason as above - preserve existing behaviour but let it be overridden.
    */
-  protected void loadAutofetchSettings(PropertiesWrapper p) {
-    autofetchConfig.loadSettings(p);
+  protected void loadAutoTuneSettings(PropertiesWrapper p) {
+    autoTuneConfig.loadSettings(p);
   }
 
   /**
@@ -1847,32 +2095,35 @@ public class ServerConfig {
    */
   protected void loadSettings(PropertiesWrapper p) {
 
+    migrationConfig.loadSettings(p);
+
     namingConvention = createNamingConvention(p, namingConvention);
     if (namingConvention != null) {
       namingConvention.loadFromProperties(p);
     }
-    if (autofetchConfig == null) {
-      autofetchConfig = new AutofetchConfig();
+    if (autoTuneConfig == null) {
+      autoTuneConfig = new AutoTuneConfig();
     }
-    loadAutofetchSettings(p);
+    loadAutoTuneSettings(p);
 
     if (dataSourceConfig == null) {
       dataSourceConfig = new DataSourceConfig();
     }
     loadDataSourceSettings(p);
 
+    explicitTransactionBeginMode = p.getBoolean("explicitTransactionBeginMode", explicitTransactionBeginMode);
     autoCommitMode = p.getBoolean("autoCommitMode", autoCommitMode);
     useJtaTransactionManager = p.getBoolean("useJtaTransactionManager", useJtaTransactionManager);
 
-    currentUserProvider = createInstance(p, CurrentUserProvider.class, "currentUserProvider");
     disableClasspathSearch = p.getBoolean("disableClasspathSearch", disableClasspathSearch);
-    databasePlatform = createInstance(p, DatabasePlatform.class, "databasePlatform");
-    encryptKeyManager = createInstance(p, EncryptKeyManager.class, "encryptKeyManager");
-    encryptDeployManager = createInstance(p, EncryptDeployManager.class, "encryptDeployManager");
-    encryptor = createInstance(p, Encryptor.class, "encryptor");
-    dbEncrypt = createInstance(p, DbEncrypt.class, "dbEncrypt");
-    serverCacheFactory = createInstance(p, ServerCacheFactory.class, "serverCacheFactory");
-    serverCacheManager = createInstance(p, ServerCacheManager.class, "serverCacheManager");
+    currentUserProvider = createInstance(p, CurrentUserProvider.class, "currentUserProvider", currentUserProvider);
+    databasePlatform = createInstance(p, DatabasePlatform.class, "databasePlatform", databasePlatform);
+    encryptKeyManager = createInstance(p, EncryptKeyManager.class, "encryptKeyManager", encryptKeyManager);
+    encryptDeployManager = createInstance(p, EncryptDeployManager.class, "encryptDeployManager", encryptDeployManager);
+    encryptor = createInstance(p, Encryptor.class, "encryptor", encryptor);
+    dbEncrypt = createInstance(p, DbEncrypt.class, "dbEncrypt", dbEncrypt);
+    serverCacheFactory = createInstance(p, ServerCacheFactory.class, "serverCacheFactory", serverCacheFactory);
+    serverCacheManager = createInstance(p, ServerCacheManager.class, "serverCacheManager", serverCacheManager);
     cacheWarmingDelay = p.getInt("cacheWarmingDelay", cacheWarmingDelay);
     classPathReaderClassName = p.get("classpathreader");
     
@@ -1907,16 +2158,21 @@ public class ServerConfig {
 
     persistenceContextScope = PersistenceContextScope.valueOf(p.get("persistenceContextScope", "TRANSACTION"));
 
+    changeLogIncludeInserts = p.getBoolean("changeLogIncludeInserts", changeLogIncludeInserts);
     expressionEqualsWithNullAsNoop = p.getBoolean("expressionEqualsWithNullAsNoop", expressionEqualsWithNullAsNoop);
-    diffFlatMode = p.getBoolean("diffFlatMode", diffFlatMode);
+
     asOfViewSuffix = p.get("asOfViewSuffix", asOfViewSuffix);
     asOfSysPeriod = p.get("asOfSysPeriod", asOfSysPeriod);
+    historyTableSuffix = p.get("historyTableSuffix", historyTableSuffix);
     dataSourceJndiName = p.get("dataSourceJndiName", dataSourceJndiName);
     databaseSequenceBatchSize = p.getInt("databaseSequenceBatchSize", databaseSequenceBatchSize);
     databaseBooleanTrue = p.get("databaseBooleanTrue", databaseBooleanTrue);
     databaseBooleanFalse = p.get("databaseBooleanFalse", databaseBooleanFalse);
     databasePlatformName = p.get("databasePlatformName", databasePlatformName);
-    uuidStoreAsBinary = p.getBoolean("uuidStoreAsBinary", uuidStoreAsBinary);
+    dbUuid = p.getEnum(DbUuid.class, "dbuuid", dbUuid);
+    if (p.getBoolean("uuidStoreAsBinary", false)) {
+      dbUuid = DbUuid.BINARY;
+    }
     localTimeWithNanos = p.getBoolean("localTimeWithNanos", localTimeWithNanos);
 
     lazyLoadBatchSize = p.getInt("lazyLoadBatchSize", lazyLoadBatchSize);
@@ -1938,7 +2194,7 @@ public class ServerConfig {
 
   private NamingConvention createNamingConvention(PropertiesWrapper properties, NamingConvention namingConvention) {
 
-    NamingConvention nc = createInstance(properties, NamingConvention.class, "namingconvention");
+    NamingConvention nc = createInstance(properties, NamingConvention.class, "namingconvention", null);
     return (nc != null) ? nc : namingConvention;
   }
 
@@ -2020,22 +2276,6 @@ public class ServerConfig {
     this.objectMapper = objectMapper;
   }
 
-  /**
-   * Return true if diff should return flat properties with dot notation rather than
-   * embedded beans or reference beans (when the associated bean id is different).
-   */
-  public boolean isDiffFlatMode() {
-    return diffFlatMode;
-  }
-
-  /**
-   * Set to true if diff should return flat properties with dot notation rather than
-   * embedded beans or reference beans (when the associated bean id is different).
-   */
-  public void setDiffFlatMode(boolean diffFlatMode) {
-    this.diffFlatMode = diffFlatMode;
-  }
-
   /**
    * Return true if eq("someProperty", null) should to generate "1=1" rather than "is null" sql expression.
    */
@@ -2054,4 +2294,25 @@ public class ServerConfig {
   public void setExpressionEqualsWithNullAsNoop(boolean expressionEqualsWithNullAsNoop) {
     this.expressionEqualsWithNullAsNoop = expressionEqualsWithNullAsNoop;
   }
+
+  /**
+   * Specify how UUID is stored.
+   */
+  public enum DbUuid {
+
+    /**
+     * Store using native UUID in H2 and Postgres.
+     */
+    AUTO,
+
+    /**
+     * Store using DB VARCHAR.
+     */
+    VARCHAR,
+
+    /**
+     * Store using DB BINARY.
+     */
+    BINARY
+  }
 }

src/main/java/com/avaje/ebean/config/UnderscoreNamingConvention.java

@@ -3,23 +3,26 @@ package com.avaje.ebean.config;
 /**
  * Converts between Camel Case and Underscore based names for both table and
  * column names (and is the default naming convention in Ebean).
- * 
+ *
  * @author emcgreal
  * @author rbygrave
  */
 public class UnderscoreNamingConvention extends AbstractNamingConvention {
 
-  /** Force toUnderscore to return in upper case. */
+  /**
+   * Force toUnderscore to return in upper case.
+   */
   private boolean forceUpperCase = false;
 
-  /** The digits compressed. */
+  /**
+   * The digits compressed.
+   */
   private boolean digitsCompressed = true;
 
   /**
    * Create with a given sequence format.
-   * 
-   * @param sequenceFormat
-   *          the sequence format
+   *
+   * @param sequenceFormat the sequence format
    */
   public UnderscoreNamingConvention(String sequenceFormat) {
     super(sequenceFormat);
@@ -34,39 +37,30 @@ public class UnderscoreNamingConvention extends AbstractNamingConvention {
 
   /**
    * Returns the last part of the class name.
-   * 
-   * @param beanClass
-   *          the bean class
-   * 
+   *
+   * @param beanClass the bean class
    * @return the table name from class
    */
   public TableName getTableNameByConvention(Class<?> beanClass) {
 
-    return new TableName(getCatalog(),
-        getSchema(),
-        toUnderscoreFromCamel(beanClass.getSimpleName()));
+    return new TableName(getCatalog(), getSchema(), toUnderscoreFromCamel(beanClass.getSimpleName()));
   }
 
   /**
    * Converts Camel case property name to underscore based column name.
-   * 
+   *
    * @return the column from property
    */
-  public String getColumnFromProperty(Class<?> beanClass, String propertyName) {// Field
-                                                                                // field)
-                                                                                // {
+  public String getColumnFromProperty(Class<?> beanClass, String propertyName) {
 
     return toUnderscoreFromCamel(propertyName);
   }
 
   /**
    * Converts underscore based column name to Camel case property name.
-   * 
-   * @param beanClass
-   *          the bean class
-   * @param dbColumnName
-   *          the db column name
-   * 
+   *
+   * @param beanClass    the bean class
+   * @param dbColumnName the db column name
    * @return the property from column
    */
   public String getPropertyFromColumn(Class<?> beanClass, String dbColumnName) {
@@ -110,7 +104,7 @@ public class UnderscoreNamingConvention extends AbstractNamingConvention {
   protected String toUnderscoreFromCamel(String camelCase) {
 
     int lastUpper = -1;
-    StringBuffer sb = new StringBuffer();
+    StringBuilder sb = new StringBuilder(camelCase.length()+4);
     for (int i = 0; i < camelCase.length(); i++) {
       char c = camelCase.charAt(i);
 
@@ -144,16 +138,11 @@ public class UnderscoreNamingConvention extends AbstractNamingConvention {
   }
 
   /**
-   * To camel from underscore.
-   * 
-   * @param underscore
-   *          the underscore
-   * 
-   * @return the string
+   * Convert and return the from string from underscore to camel case.
    */
   protected String toCamelFromUnderscore(String underscore) {
 
-    StringBuffer result = new StringBuffer();
+    StringBuilder result = new StringBuilder(underscore.length());
     String[] vals = underscore.split("_");
 
     for (int i = 0; i < vals.length; i++) {

src/main/java/com/avaje/ebean/config/dbplatform/DB2Platform.java

@@ -5,6 +5,7 @@ import java.sql.Types;
 import javax.sql.DataSource;
 
 import com.avaje.ebean.BackgroundExecutor;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.DB2Ddl;
 
 /**
  * DB2 specific platform.
@@ -14,10 +15,11 @@ public class DB2Platform extends DatabasePlatform {
   public DB2Platform() {
     super();
     this.name = "db2";
-
-    // only support getGeneratedKeys with non-batch JDBC
-    // so generally use SEQUENCE instead for H2
+    this.maxTableNameLength = 18;
+    this.maxConstraintNameLength = 18;
     this.sqlLimiter = new Db2SqlLimiter();
+    this.platformDdl = new DB2Ddl(dbTypeMap, dbIdentity);
+
     this.dbIdentity.setSupportsGetGeneratedKeys(true);
     this.dbIdentity.setSupportsSequence(true);
 
@@ -25,8 +27,6 @@ public class DB2Platform extends DatabasePlatform {
     dbTypeMap.put(Types.REAL, new DbType("real"));
     dbTypeMap.put(Types.TINYINT, new DbType("smallint"));
     dbTypeMap.put(Types.DECIMAL, new DbType("decimal", 15));
-
-    this.dbDdlSyntax.setIdentity("generated by default as identity");
   }
 
   /**

src/main/java/com/avaje/ebean/config/dbplatform/DatabasePlatform.java

@@ -1,15 +1,16 @@
 package com.avaje.ebean.config.dbplatform;
 
-import java.sql.Types;
-
-import javax.sql.DataSource;
-
 import com.avaje.ebean.BackgroundExecutor;
 import com.avaje.ebean.Query;
-
+import com.avaje.ebean.config.ServerConfig;
+import com.avaje.ebean.dbmigration.ddlgeneration.DdlHandler;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.PlatformDdl;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import javax.sql.DataSource;
+import java.sql.Types;
+
 /**
  * Database platform specific settings.
  */
@@ -17,6 +18,7 @@ public class DatabasePlatform {
 
   private static final Logger logger = LoggerFactory.getLogger(DatabasePlatform.class);
 
+
   /**
    * Behavior used when ending a query only transaction (at read committed isolation level).
    */
@@ -50,33 +52,33 @@ public class DatabasePlatform {
    */
   protected OnQueryOnly onQueryOnly = OnQueryOnly.ROLLBACK;
 
-  /** 
-   * The open quote used by quoted identifiers. 
+  /**
+   * The open quote used by quoted identifiers.
    */
   protected String openQuote = "\"";
 
   /**
-   *  The close quote used by quoted identifiers. 
+   * The close quote used by quoted identifiers.
    */
   protected String closeQuote = "\"";
 
-  /** 
-   * For limit/offset, row_number etc limiting of SQL queries. 
+  /**
+   * For limit/offset, row_number etc limiting of SQL queries.
    */
   protected SqlLimiter sqlLimiter = new LimitOffsetSqlLimiter();
 
-  /** 
-   * Mapping of JDBC to Database types. 
+  /**
+   * Mapping of JDBC to Database types.
    */
   protected DbTypeMap dbTypeMap = new DbTypeMap();
 
-  /** 
-   * DB specific DDL syntax. 
+  /**
+   * Set to true if the DB has native UUID type support.
    */
-  protected DbDdlSyntax dbDdlSyntax = new DbDdlSyntax();
+  protected boolean nativeUuidType;
 
-  /** 
-   * Defines DB identity/sequence features. 
+  /**
+   * Defines DB identity/sequence features.
    */
   protected DbIdentity dbIdentity = new DbIdentity();
 
@@ -85,28 +87,28 @@ public class DatabasePlatform {
    */
   protected DbHistorySupport historySupport;
 
-  /** 
-   * The JDBC type to map booleans to (by default). 
+  /**
+   * The JDBC type to map booleans to (by default).
    */
   protected int booleanDbType = Types.BOOLEAN;
 
-  /** 
-   * The JDBC type to map Blob to. 
+  /**
+   * The JDBC type to map Blob to.
    */
   protected int blobDbType = Types.BLOB;
 
-  /** 
-   * The JDBC type to map Clob to. 
+  /**
+   * The JDBC type to map Clob to.
    */
   protected int clobDbType = Types.CLOB;
 
-  /** 
-   * For Oracle treat empty strings as null. 
+  /**
+   * For Oracle treat empty strings as null.
    */
   protected boolean treatEmptyStringsAsNull;
 
-  /** 
-   * The database platform name. 
+  /**
+   * The database platform name.
    */
   protected String name = "generic";
 
@@ -125,7 +127,7 @@ public class DatabasePlatform {
    * The like clause. Can be overridden to disable default escape character.
    */
   protected String likeClause = "like ?";
-  
+
   protected DbEncrypt dbEncrypt;
 
   protected boolean idInExpandedForm;
@@ -145,6 +147,20 @@ public class DatabasePlatform {
    */
   protected boolean disallowBatchOnCascade;
 
+  protected PlatformDdl platformDdl;
+
+  /**
+   * The maximum length of table names - used specifically when derived
+   * default table names for intersection tables.
+   */
+  protected int maxTableNameLength = 60;
+
+  /**
+   * A value of 60 is a reasonable default for all databases except
+   * Oracle (limited to 30) and DB2 (limited to 18).
+   */
+  protected int maxConstraintNameLength = 60;
+
   /**
    * Instantiates a new database platform.
    */
@@ -157,13 +173,42 @@ public class DatabasePlatform {
    * "generic" is returned when no specific database platform has been set or
    * found.
    * </p>
-   * 
-   * @return the name
    */
   public String getName() {
     return name;
   }
 
+  /**
+   * Return the maximum table name length.
+   * <p>
+   * This is used when deriving names of intersection tables.
+   * </p>
+   */
+  public int getMaxTableNameLength() {
+    return maxTableNameLength;
+  }
+
+  /**
+   * Return the maximum constraint name allowed for the platform.
+   */
+  public int getMaxConstraintNameLength() {
+    return maxConstraintNameLength;
+  }
+
+  /**
+   * Return the platform specific DDL.
+   */
+  public PlatformDdl getPlatformDdl() {
+    return platformDdl;
+  }
+
+  /**
+   * Create and return a DDL handler for generating DDL scripts.
+   */
+  public DdlHandler createDdlHandler(ServerConfig serverConfig) {
+    return platformDdl.createDdlHandler(serverConfig);
+  }
+
   /**
    * Return true if the JDBC driver does not allow additional queries to execute
    * when a resultSet is being 'streamed' as is the case with findEach() etc.
@@ -177,16 +222,12 @@ public class DatabasePlatform {
 
   /**
    * Return a DB Sequence based IdGenerator.
-   * 
-   * @param be
-   *          the BackgroundExecutor that can be used to load the sequence if
-   *          desired
-   * @param ds
-   *          the DataSource
-   * @param seqName
-   *          the name of the sequence
-   * @param batchSize
-   *          the number of sequences that should be loaded
+   *
+   * @param be        the BackgroundExecutor that can be used to load the sequence if
+   *                  desired
+   * @param ds        the DataSource
+   * @param seqName   the name of the sequence
+   * @param batchSize the number of sequences that should be loaded
    */
   public IdGenerator createSequenceIdGenerator(BackgroundExecutor be, DataSource ds, String seqName, int batchSize) {
     return null;
@@ -234,24 +275,22 @@ public class DatabasePlatform {
     this.historySupport = historySupport;
   }
 
+  /**
+   * Return true if the DB supports native UUID.
+   */
+  public boolean isNativeUuidType() {
+    return nativeUuidType;
+  }
+
   /**
    * Return the mapping of JDBC to DB types.
-   * 
+   *
    * @return the db type map
    */
   public DbTypeMap getDbTypeMap() {
     return dbTypeMap;
   }
 
-  /**
-   * Return the DDL syntax for this platform.
-   * 
-   * @return the db ddl syntax
-   */
-  public DbDdlSyntax getDbDdlSyntax() {
-    return dbDdlSyntax;
-  }
-
   /**
    * Return the column alias prefix.
    */
@@ -282,7 +321,7 @@ public class DatabasePlatform {
 
   /**
    * Return the close quote for quoted identifiers.
-   * 
+   *
    * @return the close quote
    */
   public String getCloseQuote() {
@@ -291,7 +330,7 @@ public class DatabasePlatform {
 
   /**
    * Return the open quote for quoted identifiers.
-   * 
+   *
    * @return the open quote
    */
   public String getOpenQuote() {
@@ -300,7 +339,7 @@ public class DatabasePlatform {
 
   /**
    * Return the JDBC type used to store booleans.
-   * 
+   *
    * @return the boolean db type
    */
   public int getBooleanDbType() {
@@ -330,7 +369,7 @@ public class DatabasePlatform {
 
   /**
    * Return true if empty strings should be treated as null.
-   * 
+   *
    * @return true, if checks if is treat empty strings as null
    */
   public boolean isTreatEmptyStringsAsNull() {
@@ -366,7 +405,7 @@ public class DatabasePlatform {
 
   /**
    * Return the DB identity/sequence features for this platform.
-   * 
+   *
    * @return the db identity
    */
   public DbIdentity getDbIdentity() {
@@ -379,7 +418,7 @@ public class DatabasePlatform {
    * <p>
    * Basically add the clauses for limit/offset, rownum, row_number().
    * </p>
-   * 
+   *
    * @return the sql limiter
    */
   public SqlLimiter getSqlLimiter() {
@@ -388,15 +427,12 @@ public class DatabasePlatform {
 
   /**
    * Convert backticks to the platform specific open quote and close quote
-   * 
    * <p>
    * Specific plugins may implement this method to cater for platform specific
    * naming rules.
    * </p>
-   * 
-   * @param dbName
-   *          the db name
-   * 
+   *
+   * @param dbName the db name
    * @return the string
    */
   public String convertQuotedIdentifiers(String dbName) {
@@ -461,22 +497,4 @@ public class DatabasePlatform {
     return disallowBatchOnCascade;
   }
 
-  /**
-   * Generate and return the create sequence DDL.
-   */
-  public String ddlCreateSequence(String sequenceName, int initialValue, int allocationSize) {
-
-    StringBuilder sb = new StringBuilder("create sequence ");
-    sb.append(sequenceName);
-    if (initialValue > 1) {
-      sb.append(" start with ").append(initialValue);
-    }
-    if (allocationSize > 0 && allocationSize != 50) {
-      // at this stage ignoring allocationSize 50 as this is the 'default' and
-      // not consistent with the way Ebean batch fetches sequence values
-      sb.append(" increment by ").append(allocationSize);
-    }
-    sb.append(";");
-    return sb.toString();
-  }
 }

src/main/java/com/avaje/ebean/config/dbplatform/DbDdlSyntax.java

@@ -1,333 +0,0 @@
-package com.avaje.ebean.config.dbplatform;
-
-import com.avaje.ebean.config.TableName;
-
-/**
- * Used to support DB specific syntax for DDL generation.
- */
-public class DbDdlSyntax {
-
-  protected boolean renderIndexForFkey = true;
-
-  protected boolean inlinePrimaryKeyConstraint = false;
-
-  protected boolean addOneToOneUniqueContraint = true;
-
-  protected int maxConstraintNameLength = 32;
-
-  protected int columnNameWidth = 25;
-
-  /**
-   * Flag set when we want to disable constraints on each table (rather than globally).
-   */
-  protected boolean dropKeyConstraints;
-
-  protected String dropTableCascade;
-  protected String dropIfExists;
-
-  protected String newLine = "\n";
-
-  protected String identity = "auto_increment";
-  protected String identitySuffix = "";
-
-  protected String pkPrefix = "pk_";
-
-  protected String disableReferentialIntegrity;
-  protected String enableReferentialIntegrity;
-
-  protected String foreignKeySuffix;
-
-  /**
-   * Return the primary key name for a given bean descriptor.
-   */
-  public String getPrimaryKeyName(String tableName) {
-
-    String pk = pkPrefix + tableName;
-    if (pk.length() > maxConstraintNameLength) {
-      // need to trim the primary key name
-      pk = pk.substring(0, maxConstraintNameLength);
-    }
-    return pk;
-  }
-
-  /**
-   * Return the column definition for an identity column.
-   */
-  public String getIdentityColumnDefn(String columnDefn) {
-    String identity = getIdentity();
-    if (identity != null && identity.length() > 0) {
-      return columnDefn+" "+identity;
-    }
-    return columnDefn;
-  }
-  
-  /**
-   * Return the identity clause for DB's that have identities.
-   */
-  public String getIdentity() {
-    return identity;
-  }
-
-  /**
-   * Set the identity clause.
-   */
-  public void setIdentity(String identity) {
-    this.identity = identity;
-  }
-
-  /**
-   * Typically returns empty string but for SQLite and perhaps others
-   * the Identity/AutoIncrement clause comes after the primary key clause.
-   */
-  public String getIdentitySuffix() {
-    return identitySuffix;
-  }
-
-  /**
-   * Set the identity clause that would appear after the primary key clause.
-   * <p>
-   * Only used for SQLite at this stage.
-   * </p>
-   */
-  public void setIdentitySuffix(String identitySuffix) {
-    this.identitySuffix = identitySuffix;
-  }
-
-  /**
-   * Return the width for padding whitespace after column names.
-   */
-  public int getColumnNameWidth() {
-    return columnNameWidth;
-  }
-
-  /**
-   * Set the amount of padding to write after the column name.
-   */
-  public void setColumnNameWidth(int columnNameWidth) {
-    this.columnNameWidth = columnNameWidth;
-  }
-
-  /**
-   * Return the new line character.
-   */
-  public String getNewLine() {
-    return newLine;
-  }
-
-  /**
-   * Set the new line character.
-   */
-  public void setNewLine(String newLine) {
-    this.newLine = newLine;
-  }
-
-  /**
-   * Return the prefix used in naming primary keys.
-   */
-  public String getPkPrefix() {
-    return pkPrefix;
-  }
-
-  /**
-   * Set the prefix used in naming primary keys.
-   */
-  public void setPkPrefix(String pkPrefix) {
-    this.pkPrefix = pkPrefix;
-  }
-
-  /**
-   * Return the DB specific command to disable referential integrity
-   */
-  public String getDisableReferentialIntegrity() {
-    return disableReferentialIntegrity;
-  }
-
-  /**
-   * Set the DB specific command to disable referential integrity
-   */
-  public void setDisableReferentialIntegrity(String disableReferentialIntegrity) {
-    this.disableReferentialIntegrity = disableReferentialIntegrity;
-  }
-
-  /**
-   * Return the DB specific command to enable referential integrity
-   */
-  public String getEnableReferentialIntegrity() {
-    return enableReferentialIntegrity;
-  }
-
-  /**
-   * Set the DB specific command to enable referential integrity
-   */
-  public void setEnableReferentialIntegrity(String enableReferentialIntegrity) {
-    this.enableReferentialIntegrity = enableReferentialIntegrity;
-  }
-
-  /**
-   * Return true to is constraints are disabled on each table.
-   */
-  public boolean isDropKeyConstraints() {
-    return dropKeyConstraints;
-  }
-
-  /**
-   * Return some DDL to disable constraints on the given table.
-   */
-  public String dropKeyConstraintPrefix(String tableName, String fkName) {
-    return null;
-  }
-
-  /**
-   * Return true if indexes should be created for the foreign keys.
-   */
-  public boolean isRenderIndexForFkey() {
-    return renderIndexForFkey;
-  }
-
-  /**
-   * Set whether indexes should be created for the foreign keys.
-   */
-  public void setRenderIndexForFkey(boolean renderIndexForFkey) {
-    this.renderIndexForFkey = renderIndexForFkey;
-  }
-
-  /**
-   * Typically returns IF EXISTS (if that is supported by the database platform)
-   * or null.
-   */
-  public String getDropIfExists() {
-    return dropIfExists;
-  }
-
-  /**
-   * Set the IF EXISTS clause for dropping tables if that is supported by the
-   * database platform.
-   */
-  public void setDropIfExists(String dropIfExists) {
-    this.dropIfExists = dropIfExists;
-  }
-
-  /**
-   * Return prefix text that goes before drop table.
-   */
-  public String dropTablePrefix(String tableName) {
-    return "";
-  }
-
-  /**
-   * Return the cascade option for the drop table command.
-   */
-  public String getDropTableCascade() {
-    return dropTableCascade;
-  }
-
-  /**
-   * Set the cascade option for the drop table command.
-   */
-  public void setDropTableCascade(String dropTableCascade) {
-    this.dropTableCascade = dropTableCascade;
-  }
-
-  /**
-   * Return the foreign key suffix.
-   */
-  public String getForeignKeySuffix() {
-    return foreignKeySuffix;
-  }
-
-  /**
-   * Set the foreign key suffix.
-   */
-  public void setForeignKeySuffix(String foreignKeySuffix) {
-    this.foreignKeySuffix = foreignKeySuffix;
-  }
-
-  /**
-   * Return the maximum length that constraint names can be for this database.
-   */
-  public int getMaxConstraintNameLength() {
-    return maxConstraintNameLength;
-  }
-
-  /**
-   * Set the maximum length that constraint names can be for this database.
-   */
-  public void setMaxConstraintNameLength(int maxFkeyLength) {
-    this.maxConstraintNameLength = maxFkeyLength;
-  }
-
-  /**
-   * Return true if imported side of OneToOne's should have unique constraints
-   * generated.
-   */
-  public boolean isAddOneToOneUniqueContraint() {
-    return addOneToOneUniqueContraint;
-  }
-
-  /**
-   * Set to false for DB's that don't want both a unique and index on the
-   * imported OneToOne.
-   */
-  public void setAddOneToOneUniqueContraint(boolean addOneToOneUniqueContraint) {
-    this.addOneToOneUniqueContraint = addOneToOneUniqueContraint;
-  }
-
-  /**
-   * Return true if primary key constraints should be inlined when they are a
-   * single column.
-   */
-  public boolean isInlinePrimaryKeyConstraint() {
-    return inlinePrimaryKeyConstraint;
-  }
-
-  /**
-   * Set whether to inline primary key constraints.
-   */
-  public void setInlinePrimaryKeyConstraint(boolean inlinePrimaryKeyConstraint) {
-    this.inlinePrimaryKeyConstraint = inlinePrimaryKeyConstraint;
-  }
-
-  /**
-   * Builds and returns a fully index name.
-   */
-  public String getIndexName(String table, String propName, int ixCount) {
-
-
-    StringBuilder buffer = new StringBuilder(30);
-    buffer.append("ix_").append(TableName.parse(table));
-    buffer.append("_").append(propName);
-
-    addSuffix(buffer, ixCount);
-
-    return buffer.toString();
-  }
-
-  /**
-   * Builds and returns a fully qualified foreign key constraint name.
-   */
-  public String getForeignKeyName(String table, String propName, int fkCount) {
-
-    StringBuilder buffer = new StringBuilder(30);
-    buffer.append("fk_").append(TableName.parse(table));
-    buffer.append("_").append(propName);
-
-    addSuffix(buffer, fkCount);
-
-    return buffer.toString();
-  }
-
-  /**
-   * Adds the suffix.
-   */
-  protected void addSuffix(StringBuilder buffer, int count) {
-    String suffixNr = Integer.toString(count);
-    int suffixLen = suffixNr.length() + 1;
-
-    if (buffer.length() + suffixLen > maxConstraintNameLength) {
-      buffer.setLength(maxConstraintNameLength - suffixLen);
-    }
-    buffer.append("_");
-    buffer.append(suffixNr);
-  }
-
-}

src/main/java/com/avaje/ebean/config/dbplatform/DbHistorySupport.java

@@ -5,6 +5,37 @@ package com.avaje.ebean.config.dbplatform;
  */
 public interface DbHistorySupport {
 
+  /**
+   * Return true if the 'As of' predicate is part of the from clause
+   * (more standard sql2011). So true for Oracle total recall and false
+   * for Postgres and MySql (where we use views and history tables).
+   */
+  boolean isBindWithFromClause();
+
+  /**
+   * Return the number of columns bound in a 'As Of' predicate.
+   * <p>
+   * This is 1 for more standard sql2011 style and Postgres which has the
+   * special range type and 2 for view based solutions with 2 columns such as
+   * MySql.
+   * </p>
+   */
+  int getBindCount();
+
+  /**
+   * For sql2011 style this ignores the passed in view suffix and returns something
+   * like the ' as of timestamp ?' clause to be appended after the base table name.
+   *
+   * @param asOfViewSuffix the configured view suffix (typically "_with_history").
+   * @return The suffix appended after the base table name in the from and join clauses.
+   */
+  String getAsOfViewSuffix(String asOfViewSuffix);
+
+  /**
+   * Return the 'versions between timestamp' suffix.
+   */
+  String getVersionsBetweenSuffix(String asOfViewSuffix);
+
   /**
    * Return the 'as of' predicate added for the given table alias.
    *
@@ -18,7 +49,7 @@ public interface DbHistorySupport {
    * Return the column for the system period lower bound that will be included in findVersions() queries.
    *
    * @param tableAlias the table alias which will typically be 't0'
-   * @param sysPeriod the name of the sys_period column
+   * @param sysPeriod  the name of the sys_period column
    */
   String getSysPeriodLower(String tableAlias, String sysPeriod);
 
@@ -26,7 +57,7 @@ public interface DbHistorySupport {
    * Return the column for the system period upper bound that will be included in findVersions() queries.
    *
    * @param tableAlias the table alias which will typically be 't0'
-   * @param sysPeriod the name of the sys_period column
+   * @param sysPeriod  the name of the sys_period column
    */
   String getSysPeriodUpper(String tableAlias, String sysPeriod);
 

src/main/java/com/avaje/ebean/config/dbplatform/DbIdentity.java

@@ -1,5 +1,7 @@
 package com.avaje.ebean.config.dbplatform;
 
+import com.avaje.ebean.dbmigration.migration.IdentityType;
+
 /**
  * Defines the identity/sequence behaviour for the database.
  */
@@ -114,4 +116,28 @@ public class DbIdentity {
     this.idType = idType;
   }
 
+  /**
+   * Determine the id type to use based on requested identityType and
+   * the support for that in the database platform.
+   */
+  public IdType useIdentityType(IdentityType identityType) {
+
+    if (identityType == null) {
+      // use the default
+      return idType;
+    }
+    switch (identityType) {
+      case GENERATOR:
+        return IdType.GENERATOR;
+      case EXTERNAL:
+        return IdType.EXTERNAL;
+      case SEQUENCE:
+        return supportsSequence ? IdType.SEQUENCE : idType;
+      case IDENTITY:
+        return supportsIdentity ? IdType.IDENTITY : idType;
+    }
+
+    // use the default
+    return idType;
+  }
 }

src/main/java/com/avaje/ebean/config/dbplatform/DbPlatformName.java

@@ -0,0 +1,47 @@
+package com.avaje.ebean.config.dbplatform;
+
+/**
+ * Built in supported platforms.
+ */
+public enum DbPlatformName {
+
+  /**
+   * Generic base platform configured via properties or code.
+   */
+  GENERIC,
+
+  /**
+   * H2.
+   */
+  H2,
+
+  /**
+   * Postgres.
+   */
+  POSTGRES,
+
+  /**
+   * MySql.
+   */
+  MYSQL,
+
+  /**
+   * Oracle.
+   */
+  ORACLE,
+
+  /**
+   * Microsoft SQL Server.
+   */
+  SQLSERVER,
+
+  /**
+   * DB2.
+   */
+  DB2,
+
+  /**
+   * SQLite.
+   */
+  SQLITE
+}

src/main/java/com/avaje/ebean/config/dbplatform/DbStandardHistorySupport.java

@@ -0,0 +1,32 @@
+package com.avaje.ebean.config.dbplatform;
+
+/**
+ * SQL2011 based history support using 'as of timestamp' type clause appended as part of the the from or join clause.
+ */
+public abstract class DbStandardHistorySupport implements DbHistorySupport {
+
+  /**
+   * Return true as with sql2011 the 'as of timestamp' clause included in from or join clause.
+   */
+  @Override
+  public boolean isBindWithFromClause() {
+    return true;
+  }
+
+  /**
+   * Return 1 as the bind count (not 2 for effective start and effective end columns).
+   */
+  @Override
+  public int getBindCount() {
+    return 1;
+  }
+
+  /**
+   * Return null - not used for sql2011 based history.
+   */
+  @Override
+  public String getAsOfPredicate(String tableAlias, String sysPeriod) {
+    // not used for sql2011 based history
+    return null;
+  }
+}

src/main/java/com/avaje/ebean/config/dbplatform/DbType.java

@@ -8,6 +8,11 @@ package com.avaje.ebean.config.dbplatform;
  */
 public class DbType {
 
+  /**
+   * DB native UUID type (H2 and Postgres).
+   */
+  public static final int UUID = 5010;
+
   /**
    * Type to map Map content to Postgres HSTORE.
    */

src/main/java/com/avaje/ebean/config/dbplatform/DbTypeMap.java

@@ -9,16 +9,82 @@ import java.util.Map;
  */
 public class DbTypeMap {
 
+  private static final DbType JSON_CLOB_PLACEHOLDER = new DbType("jsonClobPlaceholder");
+  private static final DbType JSON_BLOB_PLACEHOLDER = new DbType("jsonBlobPlaceholder");
+  private static final DbType JSON_VARCHAR_PLACEHOLDER = new DbType("jsonVarcharPlaceholder");
+
+  /**
+   * A map to reverse lookup the type by name.
+   * <p>
+   * Used when converting from logical types to platform types which we
+   * want to do with 2 phase DDL generation.
+   */
+  static Map<String, Integer> lookup = new HashMap<String, Integer>();
+
+  static {
+    lookup.put("BOOLEAN", Types.BOOLEAN);
+    lookup.put("BIT", Types.BIT);
+    lookup.put("INTEGER", Types.INTEGER);
+    lookup.put("BIGINT", Types.BIGINT);
+    lookup.put("REAL", Types.REAL);
+    // Float is most common REAL mapping to have that as well
+    lookup.put("FLOAT", Types.REAL);
+
+    lookup.put("DOUBLE", Types.DOUBLE);
+    lookup.put("SMALLINT", Types.SMALLINT);
+    lookup.put("TINYINT", Types.TINYINT);
+    lookup.put("DECIMAL", Types.DECIMAL);
+    lookup.put("VARCHAR", Types.VARCHAR);
+    // VARCHAR2 - extra for Oracle specific column definition
+    lookup.put("VARCHAR2", Types.VARCHAR);
+    lookup.put("CHAR", Types.CHAR);
+    lookup.put("BLOB", Types.BLOB);
+    lookup.put("CLOB", Types.CLOB);
+
+    lookup.put("LONGVARBINARY", Types.LONGVARBINARY);
+    lookup.put("LONGVARCHAR", Types.LONGVARCHAR);
+    lookup.put("VARBINARY", Types.VARBINARY);
+    lookup.put("BINARY", Types.BINARY);
+    lookup.put("DATE", Types.DATE);
+    lookup.put("TIME", Types.TIME);
+    lookup.put("TIMESTAMP", Types.TIMESTAMP);
+
+    lookup.put("UUID", DbType.UUID);
+
+    // Not standard java.sql.Types
+    // logical JSON storage types
+    lookup.put("JSON", DbType.JSON);
+    lookup.put("JSONB", DbType.JSONB);
+    lookup.put("JSONCLOB", DbType.JSONClob);
+    lookup.put("JSONBLOB", DbType.JSONBlob);
+    lookup.put("JSONVARCHAR", DbType.JSONVarchar);
+  }
+
+
   private final Map<Integer, DbType> typeMap = new HashMap<Integer, DbType>();
 
+  /**
+   * Return the DbTypeMap with standard (not platform specific) types.
+   *
+   * This has some extended JSON types (JSON, JSONB, JSONVarchar, JSONClob, JSONBlob).
+   * These types get translated to specific database platform types during DDL generation.
+   */
+  public static DbTypeMap logicalTypes() {
+    return new DbTypeMap(true);
+  }
+
   public DbTypeMap() {
-    loadDefaults();
+    loadDefaults(false);
+  }
+
+  private DbTypeMap(boolean logicalTypes) {
+    loadDefaults(logicalTypes);
   }
 
   /**
    * Load the standard types. These can be overridden by DB specific platform.
    */
-  private void loadDefaults() {
+  private void loadDefaults(boolean logicalTypes) {
 
     put(Types.BOOLEAN, new DbType("boolean"));
     put(Types.BIT, new DbType("bit"));
@@ -37,11 +103,25 @@ public class DbTypeMap {
     put(Types.BLOB, new DbType("blob"));
     put(Types.CLOB, new DbType("clob"));
 
-    put(DbType.JSON, new DbType("clob")); // Postgres maps this to JSON
-    put(DbType.JSONB, new DbType("clob")); // Postgres maps this to JSONB
-    put(DbType.JSONClob, new DbType("clob"));
-    put(DbType.JSONBlob, new DbType("blob"));
-    put(DbType.JSONVarchar, new DbType("varchar", 1000));
+    // DB native UUID support (H2 and Postgres)
+    put(DbType.UUID, new DbType("uuid"));
+
+    if (logicalTypes) {
+      // keep it logical for 2 layer DDL generation
+      put(DbType.HSTORE, new DbType("hstore"));
+      put(DbType.JSON, new DbType("json"));
+      put(DbType.JSONB, new DbType("jsonb"));
+      put(DbType.JSONClob, new DbType("jsonclob"));
+      put(DbType.JSONBlob, new DbType("jsonblob"));
+      put(DbType.JSONVarchar, new DbType("jsonvarchar", 1000));
+
+    } else {
+      put(DbType.JSON, JSON_CLOB_PLACEHOLDER); // Postgres maps this to JSON
+      put(DbType.JSONB, JSON_CLOB_PLACEHOLDER); // Postgres maps this to JSONB
+      put(DbType.JSONClob, JSON_CLOB_PLACEHOLDER);
+      put(DbType.JSONBlob, JSON_BLOB_PLACEHOLDER);
+      put(DbType.JSONVarchar, JSON_VARCHAR_PLACEHOLDER);
+    }
 
     put(Types.LONGVARBINARY, new DbType("longvarbinary"));
     put(Types.LONGVARCHAR, new DbType("lonvarchar"));
@@ -54,24 +134,58 @@ public class DbTypeMap {
 
   }
 
+  /**
+   * Lookup the platform specific DbType given the standard sql type name.
+   */
+  public DbType lookup(String name) {
+    name = name.trim().toUpperCase();
+    Integer typeKey = lookup.get(name);
+    if (typeKey == null) {
+      throw new IllegalArgumentException("Unknown type [" + name + "] - not standard sql type");
+    }
+    // handle JSON types mapped to clob, blob and varchar
+    switch (typeKey) {
+      case DbType.JSONBlob:
+        return get(Types.BLOB);
+      case DbType.JSONClob:
+        return get(Types.CLOB);
+      case DbType.JSONVarchar:
+        return get(Types.VARCHAR);
+      case DbType.JSON:
+        return getJsonType(DbType.JSON);
+      case DbType.JSONB:
+        return getJsonType(DbType.JSONB);
+      default:
+        return get(typeKey);
+    }
+  }
+
+  private DbType getJsonType(int type) {
+    DbType dbType = get(type);
+    if (dbType == JSON_CLOB_PLACEHOLDER) {
+      return get(Types.CLOB);
+    }
+    if (dbType == JSON_BLOB_PLACEHOLDER) {
+      return get(Types.BLOB);
+    }
+    if (dbType == JSON_VARCHAR_PLACEHOLDER) {
+      return get(Types.VARCHAR);
+    }
+    // Postgres has specific type
+    return get(type);
+  }
+
   /**
    * Override the type for a given JDBC type.
    */
   public void put(int jdbcType, DbType dbType) {
-    typeMap.put(Integer.valueOf(jdbcType), dbType);
+    typeMap.put(jdbcType, dbType);
   }
 
   /**
    * Return the type for a given jdbc type.
    */
   public DbType get(int jdbcType) {
-
-    DbType dbType = typeMap.get(Integer.valueOf(jdbcType));
-    if (dbType == null) {
-      String m = "No DB type for JDBC type " + jdbcType;
-      throw new RuntimeException(m);
-    }
-
-    return dbType;
+    return typeMap.get(jdbcType);
   }
 }

src/main/java/com/avaje/ebean/config/dbplatform/DbViewHistorySupport.java

@@ -0,0 +1,82 @@
+package com.avaje.ebean.config.dbplatform;
+
+/**
+ * Database view based implementation of DbHistorySupport.
+ * <p>
+ * These implementations have explicit history tables, a view to union the
+ * base table and history table and triggers to maintain the history.
+ * </p>
+ */
+public abstract class DbViewHistorySupport implements DbHistorySupport {
+
+  /**
+   * Return false for view based implementations where we append extra 'as of' predicates to the end.
+   */
+  @Override
+  public boolean isBindWithFromClause() {
+    return false;
+  }
+
+  /**
+   * Returns the configured view suffix.
+   *
+   * @param asOfViewSuffix the configured view suffix (typically "_with_history").
+   */
+  @Override
+  public String getAsOfViewSuffix(String asOfViewSuffix) {
+    // just return the configured suffix
+    return asOfViewSuffix;
+  }
+
+  /**
+   * Returns the configured view suffix (same as getAsOfViewSuffix()).
+   *
+   * @param asOfViewSuffix the configured view suffix (typically "_with_history").
+   */
+  @Override
+  public String getVersionsBetweenSuffix(String asOfViewSuffix) {
+    // just return the configured asOfViewSuffix (using the view for versions between query)
+    return asOfViewSuffix;
+  }
+
+  /**
+   * Return 2 if we have effective start and effective end as 2 columns.
+   * Note that for postgres we can use a single range type so that returns 1.
+   */
+  @Override
+  public int getBindCount() {
+    return 2;
+  }
+
+  /**
+   * Return the 'as of' predicate clause appended to the end of the normal query predicates.
+   */
+  @Override
+  public String getAsOfPredicate(String asOfTableAlias, String asOfSysPeriod) {
+
+    // (sys_period_start < ? and (sys_period_end is null or sys_period_end > ?));
+    return "(" + asOfTableAlias + "." + asOfSysPeriod + "_start" + " <= ? and (" + asOfTableAlias + "." + asOfSysPeriod + "_end" + " is null or " + asOfTableAlias + "." + asOfSysPeriod + "_end" + " > ?))";
+  }
+
+  /**
+   * Return the lower bound column prepended with the table alias.
+   *
+   * @param tableAlias the table alias
+   * @param sysPeriod  the name of the sys_period column
+   */
+  @Override
+  public String getSysPeriodLower(String tableAlias, String sysPeriod) {
+    return tableAlias + "." + sysPeriod + "_start";
+  }
+
+  /**
+   * Return the upper bound column prepended with the table alias.
+   *
+   * @param tableAlias the table alias
+   * @param sysPeriod  the name of the sys_period column
+   */
+  @Override
+  public String getSysPeriodUpper(String tableAlias, String sysPeriod) {
+    return tableAlias + "." + sysPeriod + "_end";
+  }
+}

src/main/java/com/avaje/ebean/config/dbplatform/H2HistorySupport.java

@@ -0,0 +1,8 @@
+package com.avaje.ebean.config.dbplatform;
+
+/**
+ * Runtime support for @History with H2.
+ */
+public class H2HistorySupport extends DbViewHistorySupport {
+
+}

src/main/java/com/avaje/ebean/config/dbplatform/H2HistoryTrigger.java

@@ -0,0 +1,127 @@
+package com.avaje.ebean.config.dbplatform;
+
+import org.h2.api.Trigger;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Timestamp;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * H2 database trigger used to populate history tables to support the @History feature.
+ */
+public class H2HistoryTrigger implements Trigger {
+
+  private static final Logger logger = LoggerFactory.getLogger(H2HistoryTrigger.class);
+
+  /**
+   * Hardcoding the column and history table suffix for now. Not sure how to get that
+   * configuration into the trigger instance nicely as it is instantiated by H2.
+   */
+  private static final String SYS_PERIOD_START = "SYS_PERIOD_START";
+  private static final String SYS_PERIOD_END = "SYS_PERIOD_END";
+  private static final String HISTORY_SUFFIX = "_history";
+
+  /**
+   * SQL to insert into the history table.
+   */
+  private String insertHistorySql;
+
+  /**
+   * Position of SYS_PERIOD_START column in the Object[].
+   */
+  private int effectStartPosition;
+
+  /**
+   * Position of SYS_PERIOD_END column in the Object[].
+   */
+  private int effectEndPosition;
+
+  @Override
+  public void init(Connection conn, String schemaName, String triggerName, String tableName, boolean before, int type) throws SQLException {
+
+    // get the columns for the table
+    ResultSet rs = conn.getMetaData().getColumns(null, schemaName, tableName, null);
+
+    // build the insert into history table SQL
+    StringBuilder insertSql = new StringBuilder(150);
+    insertSql.append("insert into ").append(tableName).append(HISTORY_SUFFIX).append(" (");
+
+    int count = 0;
+    List<String> columns = new ArrayList<String>();
+    while (rs.next()) {
+      if (++count > 1) {
+        insertSql.append(",");
+      }
+      String columnName = rs.getString("COLUMN_NAME");
+      if (columnName.equalsIgnoreCase(SYS_PERIOD_START)) {
+        this.effectStartPosition = count - 1;
+      } else if (columnName.equalsIgnoreCase(SYS_PERIOD_END)) {
+        this.effectEndPosition = count - 1;
+      }
+      insertSql.append(columnName);
+      columns.add(columnName);
+    }
+    insertSql.append(") values (");
+    for (int i = 0; i < count; i++) {
+      if (i > 0) {
+        insertSql.append(",");
+      }
+      insertSql.append("?");
+    }
+    insertSql.append(");");
+
+    this.insertHistorySql = insertSql.toString();
+    logger.debug("History table insert sql: {}", insertHistorySql);
+  }
+
+  @Override
+  public void fire(Connection connection, Object[] oldRow, Object[] newRow) throws SQLException {
+
+    if (oldRow != null) {
+      // a delete or update event
+      Timestamp now = new Timestamp(System.currentTimeMillis());
+      oldRow[effectEndPosition] = now;
+      if (newRow != null) {
+        // update event. Set the effective start timestamp to now.
+        newRow[effectStartPosition] = now;
+      }
+      if (logger.isDebugEnabled()) {
+        logger.debug("History insert: {}", Arrays.toString(oldRow));
+      }
+      insertIntoHistory(connection, oldRow);
+    }
+  }
+
+  /**
+   * Insert the data into the history table.
+   */
+  private void insertIntoHistory(Connection connection, Object[] oldRow) throws SQLException {
+
+    PreparedStatement stmt = connection.prepareStatement(insertHistorySql);
+    try {
+      for (int i = 0; i < oldRow.length; i++) {
+        stmt.setObject(i + 1, oldRow[i]);
+      }
+      stmt.executeUpdate();
+    } finally {
+      stmt.close();
+    }
+  }
+
+  @Override
+  public void close() throws SQLException {
+
+  }
+
+  @Override
+  public void remove() throws SQLException {
+
+  }
+}

src/main/java/com/avaje/ebean/config/dbplatform/H2Platform.java

@@ -1,6 +1,7 @@
 package com.avaje.ebean.config.dbplatform;
 
 import com.avaje.ebean.BackgroundExecutor;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.H2Ddl;
 
 import javax.sql.DataSource;
 
@@ -13,9 +14,9 @@ public class H2Platform extends DatabasePlatform {
     super();
     this.name = "h2";
     this.dbEncrypt = new H2DbEncrypt();
-    // like ? escape'' not working in the latest version H2 so just using no
-    // escape clause for now noting that backslash is an escape char for like in H2
-    this.likeClause = "like ?";
+    this.platformDdl = new H2Ddl(this.dbTypeMap, dbIdentity);
+    this.historySupport = new H2HistorySupport();
+    this.nativeUuidType = true;
 
     // only support getGeneratedKeys with non-batch JDBC
     // so generally use SEQUENCE instead of IDENTITY for H2
@@ -24,16 +25,12 @@ public class H2Platform extends DatabasePlatform {
     this.dbIdentity.setSupportsSequence(true);
     this.dbIdentity.setSupportsIdentity(true);
 
-    this.openQuote = "\"";
-    this.closeQuote = "\"";
+    // like ? escape'' not working in the latest version H2 so just using no
+    // escape clause for now noting that backslash is an escape char for like in H2
+    this.likeClause = "like ?";
 
     // H2 data types match default JDBC types
     // so no changes to dbTypeMap required
-
-    this.dbDdlSyntax.setDropIfExists("if exists");
-    this.dbDdlSyntax.setDisableReferentialIntegrity("SET REFERENTIAL_INTEGRITY FALSE");
-    this.dbDdlSyntax.setEnableReferentialIntegrity("SET REFERENTIAL_INTEGRITY TRUE");
-    this.dbDdlSyntax.setForeignKeySuffix("on delete restrict on update restrict");
   }
 
   /**

src/main/java/com/avaje/ebean/config/dbplatform/HsqldbPlatform.java

@@ -1,6 +1,7 @@
 package com.avaje.ebean.config.dbplatform;
 
 import com.avaje.ebean.BackgroundExecutor;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.HsqldbDdl;
 
 import javax.sql.DataSource;
 import java.sql.Types;
@@ -14,32 +15,18 @@ public class HsqldbPlatform extends DatabasePlatform {
     super();
     this.name = "hsqldb";
     this.dbEncrypt = new H2DbEncrypt();
+    this.platformDdl = new HsqldbDdl(dbTypeMap, dbIdentity);
+
     this.dbIdentity.setIdType(IdType.IDENTITY);
     this.dbIdentity.setSupportsGetGeneratedKeys(true);
     this.dbIdentity.setSupportsSequence(true);
     this.dbIdentity.setSupportsIdentity(true);
 
-    this.openQuote = "\"";
-    this.closeQuote = "\"";
-
-    // H2 data types match default JDBC types
-    // so no changes to dbTypeMap required
     dbTypeMap.put(Types.INTEGER, new DbType("integer", false));
-
-    this.dbDdlSyntax.setDropIfExists("if exists");
-    this.dbDdlSyntax.setDisableReferentialIntegrity("SET DATABASE REFERENTIAL INTEGRITY FALSE");
-    this.dbDdlSyntax.setEnableReferentialIntegrity("SET DATABASE REFERENTIAL INTEGRITY TRUE");
-    this.dbDdlSyntax.setForeignKeySuffix("on delete restrict on update restrict");
-    this.dbDdlSyntax.setIdentity("GENERATED BY DEFAULT AS IDENTITY (START WITH 1) ");
   }
 
-  /**
-   * Return a H2 specific sequence IdGenerator that supports batch fetching
-   * sequence values.
-   */
   @Override
-  public IdGenerator createSequenceIdGenerator(BackgroundExecutor be,
-      DataSource ds, String seqName, int batchSize) {
+  public IdGenerator createSequenceIdGenerator(BackgroundExecutor be, DataSource ds, String seqName, int batchSize) {
 
     return new H2SequenceIdGenerator(be, ds, seqName, batchSize);
   }

src/main/java/com/avaje/ebean/config/dbplatform/IdGenerator.java

@@ -16,7 +16,7 @@ public interface IdGenerator {
   /**
    * The name of the default UUID generator.
    */
-  static final String AUTO_UUID = "auto.uuid";
+  String AUTO_UUID = "auto.uuid";
 
   /**
    * Return the name of the IdGenerator. For sequences this is the sequence

src/main/java/com/avaje/ebean/config/dbplatform/IdType.java

@@ -26,6 +26,15 @@ public enum IdType {
    * id properties of type UUID.
    * </p>
    */
-  GENERATOR;
+  GENERATOR,
+
+  /**
+   * Expected that the identity is externally set (for example a ISO code for
+   * country or currency or a user defined code for lookup tables).
+   * <p>
+   * Used when the key is a compound key or lookup table code.
+   * </p>
+   */
+  EXTERNAL
 
 }

src/main/java/com/avaje/ebean/config/dbplatform/MsSqlServer2005Platform.java

@@ -1,5 +1,7 @@
 package com.avaje.ebean.config.dbplatform;
 
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.MsSqlServerDdl;
+
 import java.sql.Types;
 
 /**
@@ -21,8 +23,9 @@ public class MsSqlServer2005Platform extends DatabasePlatform {
     // due to lack of support for getGeneratedKeys in batch mode
     this.disallowBatchOnCascade = true;
     this.idInExpandedForm = true;
+    this.selectCountWithAlias = true;
     this.sqlLimiter = new MsSqlServer2005SqlLimiter();
-    this.dbDdlSyntax = new MsDdlSyntax();
+    this.platformDdl = new MsSqlServerDdl(dbTypeMap, dbIdentity);
     this.dbIdentity.setIdType(IdType.IDENTITY);
     this.dbIdentity.setSupportsGetGeneratedKeys(true);
     this.dbIdentity.setSupportsIdentity(true);
@@ -44,35 +47,9 @@ public class MsSqlServer2005Platform extends DatabasePlatform {
     dbTypeMap.put(Types.LONGVARBINARY, new DbType("image"));
     dbTypeMap.put(Types.LONGVARCHAR, new DbType("text"));
 
-    dbTypeMap.put(Types.DATE, new DbType("datetime"));
-    dbTypeMap.put(Types.TIME, new DbType("datetime"));
-    dbTypeMap.put(Types.TIMESTAMP, new DbType("datetime"));
-
-  }
-
-  /**
-   * MS SQL Server specific DDL Syntax.
-   */
-  public class MsDdlSyntax extends DbDdlSyntax {
-
-    MsDdlSyntax() {
-      this.identity = "identity(1,1)";
-      this.dropKeyConstraints = true;
-    }
-
-    /**
-     * Return some DDL to disable constraints on the given table.
-     */
-    public String dropKeyConstraintPrefix(String tableName, String fkName) {
-      return "IF OBJECT_ID('"+fkName+"', 'F') IS NOT NULL";
-    }
-
-    /**
-     * Return prefix text that goes before drop table.
-     */
-    public String dropTablePrefix(String tableName) {
-      return "IF OBJECT_ID('"+tableName+"', 'U') IS NOT NULL ";
-    }
+    dbTypeMap.put(Types.DATE, new DbType("date"));
+    dbTypeMap.put(Types.TIME, new DbType("time"));
+    dbTypeMap.put(Types.TIMESTAMP, new DbType("datetime2"));
 
   }
 

src/main/java/com/avaje/ebean/config/dbplatform/MsSqlServer2005SqlLimiter.java

@@ -31,10 +31,11 @@ public class MsSqlServer2005SqlLimiter implements SqlLimiter {
 
     if (firstRow < 1) {
       // just use top n
-      sb.append(" select top ").append(lastRow).append(" ");
+      sb.append(" select ");
       if (request.isDistinct()) {
         sb.append("distinct ");
       }
+      sb.append(" top ").append(lastRow).append(" ");
       sb.append(request.getDbSql());
       return new SqlLimitResponse(sb.toString(), false);
     }

src/main/java/com/avaje/ebean/config/dbplatform/MySqlHistorySupport.java

@@ -0,0 +1,8 @@
+package com.avaje.ebean.config.dbplatform;
+
+/**
+ * Runtime support for @History with MySql.
+ */
+public class MySqlHistorySupport extends DbViewHistorySupport {
+
+}

src/main/java/com/avaje/ebean/config/dbplatform/MySqlPlatform.java

@@ -1,6 +1,7 @@
 package com.avaje.ebean.config.dbplatform;
 
 import com.avaje.ebean.BackgroundExecutor;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.MySqlDdl;
 
 import javax.sql.DataSource;
 import java.sql.Types;
@@ -24,6 +25,8 @@ public class MySqlPlatform extends DatabasePlatform {
     this.likeClause = "like ? escape''";
     this.selectCountWithAlias = true;
     this.dbEncrypt = new MySqlDbEncrypt();
+    this.platformDdl = new MySqlDdl(this.dbTypeMap, this.dbIdentity);
+    this.historySupport = new MySqlHistorySupport();
 
     this.dbIdentity.setIdType(IdType.IDENTITY);
     this.dbIdentity.setSupportsGetGeneratedKeys(true);
@@ -43,12 +46,6 @@ public class MySqlPlatform extends DatabasePlatform {
     dbTypeMap.put(Types.BLOB, new MySqlBlob());
     dbTypeMap.put(Types.BINARY, new DbType("binary", 255));
     dbTypeMap.put(Types.VARBINARY, new DbType("varbinary", 255));
-
-    dbDdlSyntax.setMaxConstraintNameLength(64);
-    dbDdlSyntax.setDisableReferentialIntegrity("SET FOREIGN_KEY_CHECKS=0");
-    dbDdlSyntax.setEnableReferentialIntegrity("SET FOREIGN_KEY_CHECKS=1");
-    dbDdlSyntax.setForeignKeySuffix("on delete restrict on update restrict");
-
   }
 
   /**

src/main/java/com/avaje/ebean/config/dbplatform/Oracle9Platform.java

@@ -1,15 +0,0 @@
-package com.avaje.ebean.config.dbplatform;
-
-/**
- * Since Ebean v2.2.0 Oracle9 is no different from Oracle10.
- * <p>
- * This will be removed in the future.
- * </p>
- */
-public class Oracle9Platform extends Oracle10Platform {
-
-  public Oracle9Platform() {
-    super();
-  }
-
-}

src/main/java/com/avaje/ebean/config/dbplatform/OracleDbEncrypt.java

@@ -43,25 +43,25 @@ package com.avaje.ebean.config.dbplatform;
  * 
  * @author rbygrave
  */
-public class Oracle10DbEncrypt extends AbstractDbEncrypt {
+public class OracleDbEncrypt extends AbstractDbEncrypt {
 
   /**
    * Constructs the Oracle10DbEncrypt with default encrypt and decrypt stored procedures.
    */
-  public Oracle10DbEncrypt() {
+  public OracleDbEncrypt() {
     this("eb_encrypt", "eb_decrypt");
   }
 
   /**
    * Constructs the Oracle10DbEncrypt specifying encrypt and decrypt stored procedures.
    *
-   * @param encryptfunction the encrypt stored procedure
-   * @param decryptfunction the decrypt stored procedure
+   * @param encryptFunction the encrypt stored procedure
+   * @param decryptFunction the decrypt stored procedure
    */
-  public Oracle10DbEncrypt(String encryptfunction, String decryptfunction) {
+  public OracleDbEncrypt(String encryptFunction, String decryptFunction) {
 
-    this.varcharEncryptFunction = new OraVarcharFunction(encryptfunction, decryptfunction);
-    this.dateEncryptFunction = new OraDateFunction(encryptfunction, decryptfunction);
+    this.varcharEncryptFunction = new OraVarcharFunction(encryptFunction, decryptFunction);
+    this.dateEncryptFunction = new OraDateFunction(encryptFunction, decryptFunction);
   }
 
   /**

src/main/java/com/avaje/ebean/config/dbplatform/OracleDbHistorySupport.java

@@ -0,0 +1,37 @@
+package com.avaje.ebean.config.dbplatform;
+
+/**
+ * Oracle Total recall based history support.
+ */
+public class OracleDbHistorySupport extends DbStandardHistorySupport {
+
+  /**
+   * Return the ' as of timestamp ?' clause appended after the table name.
+   */
+  @Override
+  public String getAsOfViewSuffix(String asOfViewSuffix) {
+    return " as of TIMESTAMP ?";
+  }
+
+  @Override
+  public String getVersionsBetweenSuffix(String asOfViewSuffix) {
+    return " versions between timestamp ? and ?";
+  }
+
+  /**
+   * Returns the Oracle specific effective start column.
+   */
+  @Override
+  public String getSysPeriodLower(String tableAlias, String sysPeriod) {
+    return "versions_starttime";
+  }
+
+  /**
+   * Returns the Oracle specific effective end column.
+   */
+  @Override
+  public String getSysPeriodUpper(String tableAlias, String sysPeriod) {
+    return "versions_endtime";
+  }
+
+}

src/main/java/com/avaje/ebean/config/dbplatform/OraclePlatform.java

@@ -1,6 +1,7 @@
 package com.avaje.ebean.config.dbplatform;
 
 import com.avaje.ebean.BackgroundExecutor;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.Oracle10Ddl;
 
 import javax.sql.DataSource;
 import java.sql.Types;
@@ -8,15 +9,19 @@ import java.sql.Types;
 /**
  * Oracle10 and greater specific platform.
  */
-public class Oracle10Platform extends DatabasePlatform {
+public class OraclePlatform extends DatabasePlatform {
 
-  public Oracle10Platform() {
+  public OraclePlatform() {
     super();
     this.name = "oracle";
+    this.maxTableNameLength = 30;
+    this.maxConstraintNameLength = 30;
     // OnQueryOnly.CLOSE as a performance optimisation on Oracle
     this.onQueryOnly = OnQueryOnly.CLOSE;
-    this.dbEncrypt = new Oracle10DbEncrypt();
+    this.dbEncrypt = new OracleDbEncrypt();
     this.sqlLimiter = new RownumSqlLimiter();
+    this.platformDdl = new Oracle10Ddl(this.dbTypeMap, this.dbIdentity);
+    this.historySupport = new OracleDbHistorySupport();
 
     // Not using getGeneratedKeys as instead we will
     // batch load sequences which enables JDBC batch execution
@@ -48,15 +53,10 @@ public class Oracle10Platform extends DatabasePlatform {
     dbTypeMap.put(Types.BINARY, new DbType("raw", 255));
 
     dbTypeMap.put(Types.TIME, new DbType("timestamp"));
-
-    dbDdlSyntax.setDropTableCascade("cascade constraints purge");
-    dbDdlSyntax.setIdentity(null);
-    dbDdlSyntax.setMaxConstraintNameLength(30);
   }
 
   @Override
-  public IdGenerator createSequenceIdGenerator(BackgroundExecutor be, DataSource ds,
-      String seqName, int batchSize) {
+  public IdGenerator createSequenceIdGenerator(BackgroundExecutor be, DataSource ds, String seqName, int batchSize) {
 
     return new OracleSequenceIdGenerator(be, ds, seqName, batchSize);
   }

src/main/java/com/avaje/ebean/config/dbplatform/Postgres8Platform.java

@@ -1,66 +1,20 @@
 package com.avaje.ebean.config.dbplatform;
 
-import com.avaje.ebean.BackgroundExecutor;
-
-import javax.sql.DataSource;
-import java.sql.Types;
-
 /**
  * Postgres v8.3 specific platform.
  * <p>
  * No support for getGeneratedKeys.
  * </p>
  */
-public class Postgres8Platform extends DatabasePlatform {
+public class Postgres8Platform extends PostgresPlatform {
 
   public Postgres8Platform() {
     super();
-    this.name = "postgres";
-    this.selectCountWithAlias = true;
-    this.blobDbType = Types.LONGVARBINARY;
-    this.clobDbType = Types.VARCHAR;
-
-    this.dbEncrypt = new PostgresDbEncrypt();
-    this.historySupport = new PostgresHistorySupport();
-
     this.dbIdentity.setSupportsGetGeneratedKeys(false);
     this.dbIdentity.setIdType(IdType.SEQUENCE);
     this.dbIdentity.setSupportsSequence(true);
-
+    this.dbIdentity.setSupportsIdentity(true);
     this.columnAliasPrefix = "as c";
-    this.openQuote = "\"";
-    this.closeQuote = "\"";
-
-    // dbTypeMap.put(Types.BOOLEAN, new DbType("bit default 0"));
-
-    dbTypeMap.put(Types.INTEGER, new DbType("integer", false));
-    dbTypeMap.put(Types.DOUBLE, new DbType("float"));
-    dbTypeMap.put(Types.TINYINT, new DbType("smallint"));
-    dbTypeMap.put(Types.DECIMAL, new DbType("decimal", 38));
-
-    dbTypeMap.put(Types.BINARY, new DbType("bytea", false));
-    dbTypeMap.put(Types.VARBINARY, new DbType("bytea", false));
-
-    dbTypeMap.put(Types.BLOB, new DbType("bytea", false));
-    dbTypeMap.put(Types.CLOB, new DbType("text"));
-    dbTypeMap.put(Types.LONGVARBINARY, new DbType("bytea", false));
-    dbTypeMap.put(Types.LONGVARCHAR, new DbType("text"));
-
-    dbDdlSyntax.setDropTableCascade("cascade");
-    dbDdlSyntax.setDropIfExists("if exists");
   }
 
-  /**
-   * Create a Postgres specific sequence IdGenerator.
-   */
-  @Override
-  public IdGenerator createSequenceIdGenerator(BackgroundExecutor be, DataSource ds, String seqName, int batchSize) {
-
-    return new PostgresSequenceIdGenerator(be, ds, seqName, batchSize);
-  }
-
-  @Override
-  protected String withForUpdate(String sql) {
-    return sql + " for update";
-  }
 }

src/main/java/com/avaje/ebean/config/dbplatform/PostgresDdlSyntax.java

@@ -1,25 +0,0 @@
-package com.avaje.ebean.config.dbplatform;
-
-public class PostgresDdlSyntax extends DbDdlSyntax {
-
-  /**
-   * Map bigint, integer and smallint into their equivilent serial types. 
-   */
-  @Override
-  public String getIdentityColumnDefn(String columnDefn) {
-    
-    //smallserial, serial and bigserial
-    if ("bigint".equalsIgnoreCase(columnDefn)) {
-      return "bigserial";
-    }
-    if ("integer".equalsIgnoreCase(columnDefn)) {
-      return "serial";
-    }
-    if ("smallint".equalsIgnoreCase(columnDefn)) {
-      return "smallserial";
-    }
-    
-    return columnDefn;
-  }
-
-}

src/main/java/com/avaje/ebean/config/dbplatform/PostgresHistorySupport.java

@@ -3,7 +3,15 @@ package com.avaje.ebean.config.dbplatform;
 /**
  * Postgres support for history features.
  */
-public class PostgresHistorySupport implements DbHistorySupport {
+public class PostgresHistorySupport extends DbViewHistorySupport {
+
+  /**
+   * Return 1 as we are using the postgres range type and hence don't need 2 bind variables.
+   */
+  @Override
+  public int getBindCount() {
+    return 1;
+  }
 
   /**
    * Build and return the 'as of' predicate for a given table alias.
@@ -16,18 +24,16 @@ public class PostgresHistorySupport implements DbHistorySupport {
 
     // for Postgres we are using the 'timestamp with timezone range' data type
     // as our sys_period column so hence the predicate below
-    StringBuilder sb = new StringBuilder(40);
-    sb.append(asOfTableAlias).append(".").append(asOfSysPeriod).append(" @> ?::timestamptz");
-    return sb.toString();
+    return asOfTableAlias + "." + asOfSysPeriod + " @> ?::timestamptz";
   }
 
   @Override
   public String getSysPeriodLower(String tableAlias, String sysPeriod) {
-    return "lower("+tableAlias+"."+sysPeriod+")";
+    return "lower(" + tableAlias + "." + sysPeriod + ")";
   }
 
   @Override
   public String getSysPeriodUpper(String tableAlias, String sysPeriod) {
-    return "upper("+tableAlias+"."+sysPeriod+")";
+    return "upper(" + tableAlias + "." + sysPeriod + ")";
   }
 }

src/main/java/com/avaje/ebean/config/dbplatform/PostgresPlatform.java

@@ -1,6 +1,9 @@
 package com.avaje.ebean.config.dbplatform;
 
 import com.avaje.ebean.BackgroundExecutor;
+import com.avaje.ebean.config.ServerConfig;
+import com.avaje.ebean.dbmigration.ddlgeneration.DdlHandler;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.PostgresDdl;
 
 import javax.sql.DataSource;
 import java.sql.Types;
@@ -16,29 +19,32 @@ public class PostgresPlatform extends DatabasePlatform {
   public PostgresPlatform() {
     super();
     this.name = "postgres";
+
     // OnQueryOnly.CLOSE as a performance optimisation on Postgres
     this.onQueryOnly = OnQueryOnly.CLOSE;
     this.likeClause = "like ? escape''";
-    
-    this.dbDdlSyntax = new PostgresDdlSyntax();
-    
+
     this.selectCountWithAlias = true;
     this.blobDbType = Types.LONGVARBINARY;
     this.clobDbType = Types.VARCHAR;
 
     this.dbEncrypt = new PostgresDbEncrypt();
     this.historySupport = new PostgresHistorySupport();
+    this.platformDdl = new PostgresDdl(this.dbTypeMap, this.dbIdentity);
 
     // Use Identity and getGeneratedKeys
     this.dbIdentity.setIdType(IdType.IDENTITY);
     this.dbIdentity.setSupportsGetGeneratedKeys(true);
     this.dbIdentity.setSupportsSequence(true);
 
-    this.columnAliasPrefix = "as c";
+    //this.columnAliasPrefix = "as c";
 
     this.openQuote = "\"";
     this.closeQuote = "\"";
 
+    DbType dbTypeText = new DbType("text");
+    DbType dbBytea = new DbType("bytea", false);
+
     dbTypeMap.put(DbType.HSTORE, new DbType("hstore"));
     dbTypeMap.put(DbType.JSON, new DbType("json"));
     dbTypeMap.put(DbType.JSONB, new DbType("jsonb"));
@@ -48,18 +54,22 @@ public class PostgresPlatform extends DatabasePlatform {
     dbTypeMap.put(Types.TINYINT, new DbType("smallint"));
     dbTypeMap.put(Types.DECIMAL, new DbType("decimal", 38));
 
-    dbTypeMap.put(Types.BINARY, new DbType("bytea", false));
-    dbTypeMap.put(Types.VARBINARY, new DbType("bytea", false));
+    dbTypeMap.put(Types.BINARY, dbBytea);
+    dbTypeMap.put(Types.VARBINARY, dbBytea);
 
-    dbTypeMap.put(Types.BLOB, new DbType("bytea", false));
-    dbTypeMap.put(Types.CLOB, new DbType("text"));
-    dbTypeMap.put(Types.LONGVARBINARY, new DbType("bytea", false));
-    dbTypeMap.put(Types.LONGVARCHAR, new DbType("text"));
+    dbTypeMap.put(Types.BLOB, dbBytea);
+    dbTypeMap.put(Types.CLOB, dbTypeText);
+    dbTypeMap.put(Types.LONGVARBINARY, dbBytea);
+    dbTypeMap.put(Types.LONGVARCHAR, dbTypeText);
 
-    dbDdlSyntax.setDropTableCascade("cascade");
-    dbDdlSyntax.setDropIfExists("if exists");
   }
 
+  /**
+   * Return a DdlHandler instance for generating DDL for the specific platform.
+   */
+  public DdlHandler createDdlHandler(ServerConfig serverConfig) {
+    return this.platformDdl.createDdlHandler(serverConfig);
+  }
 
   /**
    * Create a Postgres specific sequence IdGenerator.

src/main/java/com/avaje/ebean/config/dbplatform/SQLitePlatform.java

@@ -1,22 +1,20 @@
 package com.avaje.ebean.config.dbplatform;
 
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.SQLiteDdl;
+
 import java.sql.Types;
 
-import javax.sql.DataSource;
-
-import com.avaje.ebean.BackgroundExecutor;
-
 public class SQLitePlatform extends DatabasePlatform {
 
   public SQLitePlatform() {
     super();
     this.name = "sqlite";
+    this.platformDdl = new SQLiteDdl(dbTypeMap, dbIdentity);
 
     this.dbIdentity.setIdType(IdType.IDENTITY);
     this.dbIdentity.setSupportsGetGeneratedKeys(false);
+    this.dbIdentity.setSupportsSequence(false);
     this.dbIdentity.setSelectLastInsertedIdTemplate("select last_insert_rowid()");
-    this.openQuote = "\"";
-    this.closeQuote = "\"";
 
     this.booleanDbType = Types.INTEGER;
 
@@ -24,25 +22,7 @@ public class SQLitePlatform extends DatabasePlatform {
     dbTypeMap.put(Types.BOOLEAN, new DbType("int default 0"));
     dbTypeMap.put(Types.BIGINT, new DbType("integer"));
     dbTypeMap.put(Types.SMALLINT, new DbType("integer"));
-    
-    dbDdlSyntax.setInlinePrimaryKeyConstraint(true);
-    
-    // AutoIncrement goes the primary key declaration
-    dbDdlSyntax.setIdentity("");
-    dbDdlSyntax.setIdentitySuffix("AUTOINCREMENT");
 
-    dbDdlSyntax.setDisableReferentialIntegrity("PRAGMA foreign_keys = OFF");
-    dbDdlSyntax.setEnableReferentialIntegrity("PRAGMA foreign_keys = ON");
-  }
-
-  /**
-   * Return null in case there is a sequence annotation.
-   */
-  @Override
-  public IdGenerator createSequenceIdGenerator(BackgroundExecutor be,
-      DataSource ds, String seqName, int batchSize) {
-
-    return null;
   }
 
 }

src/main/java/com/avaje/ebean/config/dbplatform/SequenceIdGenerator.java

@@ -42,7 +42,7 @@ public abstract class SequenceIdGenerator implements IdGenerator {
 
   protected final ArrayList<Long> idList = new ArrayList<Long>(50);
 
-  protected int batchSize;
+  protected final int batchSize;
 
   protected int currentlyBackgroundLoading;
 

src/main/java/com/avaje/ebean/config/dbplatform/SimpleSequenceIdGenerator.java

@@ -61,8 +61,7 @@ public class SimpleSequenceIdGenerator implements IdGenerator {
       pstmt = c.prepareStatement(sql);
       rset = pstmt.executeQuery();
       if (rset.next()) {
-        int val = rset.getInt(1);
-        return Integer.valueOf(val);
+        return rset.getInt(1);
       } else {
         String m = "Always expecting 1 row from " + sql;
         throw new PersistenceException(m);

src/main/java/com/avaje/ebean/config/dbplatform/SqlAnywherePlatform.java

@@ -11,7 +11,6 @@ import java.sql.Types;
  * </ul>
  * </p>
  */
-
 public class SqlAnywherePlatform extends DatabasePlatform {
 
   public SqlAnywherePlatform() {

src/main/java/com/avaje/ebean/config/dbplatform/SqlLimiter.java

@@ -11,12 +11,7 @@ public interface SqlLimiter {
    * Note that this is removed for logging sql to the transaction log.
    * </p>
    */
-  static final char NEW_LINE = '\n';
-
-  /**
-   * The carriage return character.
-   */
-  static final char CARRIAGE_RETURN = '\r';
+  char NEW_LINE = '\n';
 
   /**
    * Add the SQL limiting statements around the query.

src/main/java/com/avaje/ebean/dbmigration/DbMigration.java

@@ -0,0 +1,327 @@
+package com.avaje.ebean.dbmigration;
+
+import com.avaje.ebean.Ebean;
+import com.avaje.ebean.EbeanServer;
+import com.avaje.ebean.config.DbConstraintNaming;
+import com.avaje.ebean.config.DbMigrationConfig;
+import com.avaje.ebean.config.ServerConfig;
+import com.avaje.ebean.config.dbplatform.DB2Platform;
+import com.avaje.ebean.config.dbplatform.DatabasePlatform;
+import com.avaje.ebean.config.dbplatform.DbPlatformName;
+import com.avaje.ebean.config.dbplatform.H2Platform;
+import com.avaje.ebean.config.dbplatform.MsSqlServer2005Platform;
+import com.avaje.ebean.config.dbplatform.MySqlPlatform;
+import com.avaje.ebean.config.dbplatform.OraclePlatform;
+import com.avaje.ebean.config.dbplatform.PostgresPlatform;
+import com.avaje.ebean.config.dbplatform.SQLitePlatform;
+import com.avaje.ebean.dbmigration.ddlgeneration.DdlWrite;
+import com.avaje.ebean.dbmigration.migration.Migration;
+import com.avaje.ebean.dbmigration.migrationreader.MigrationXmlWriter;
+import com.avaje.ebean.dbmigration.model.CurrentModel;
+import com.avaje.ebean.dbmigration.model.MConfiguration;
+import com.avaje.ebean.dbmigration.model.MigrationModel;
+import com.avaje.ebean.dbmigration.model.ModelContainer;
+import com.avaje.ebean.dbmigration.model.PlatformDdlWriter;
+import com.avaje.ebean.dbmigration.model.ModelDiff;
+import com.avaje.ebeaninternal.api.SpiEbeanServer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Generates DB Migration xml and sql scripts.
+ * <p>
+ * Reads the prior migrations and compares with the current model of the EbeanServer
+ * and generates a migration 'diff' in the form of xml document with the logical schema
+ * changes and a series of sql scripts to apply, rollback the applied changes if necessary
+ * and drop objects (drop tables, drop columns).
+ * </p>
+ * <p>
+ *   This does not run the migration or ddl scripts but just generates them.
+ * </p>
+ * <pre>{@code
+ *
+ *       DbMigration migration = new DbMigration();
+ *       migration.setPathToResources("src/main/resources");
+ *       migration.setPlatform(DbPlatformName.ORACLE);
+ *
+ *       migration.generateMigration();
+ *
+ * }</pre>
+ */
+public class DbMigration {
+
+  protected static final Logger logger = LoggerFactory.getLogger(DbMigration.class);
+
+  protected SpiEbeanServer server;
+
+  protected DbMigrationConfig migrationConfig;
+
+  protected String pathToResources = "src/main/resources";
+
+  protected DatabasePlatform databasePlatform;
+
+  protected List<Pair> platforms = new ArrayList<Pair>();
+
+  protected ServerConfig serverConfig;
+
+  protected DbConstraintNaming constraintNaming;
+
+  public DbMigration() {
+  }
+
+  /**
+   * Set the path from the current working directory to the application resources.
+   *
+   * This defaults to maven style 'src/main/resources'.
+   */
+  public void setPathToResources(String pathToResources) {
+    this.pathToResources = pathToResources;
+  }
+
+  /**
+   * Set the server to use to determine the current model.
+   * Typically this is not called explicitly.
+   */
+  public void setServer(EbeanServer ebeanServer) {
+    this.server = (SpiEbeanServer) ebeanServer;
+    setServerConfig(server.getServerConfig());
+  }
+
+  /**
+   * Set the serverConfig to use. Typically this is not called explicitly.
+   */
+  public void setServerConfig(ServerConfig config) {
+    if (this.serverConfig == null) {
+      this.serverConfig = config;
+    }
+    if (migrationConfig == null) {
+      this.migrationConfig = serverConfig.getMigrationConfig();
+    }
+    if (constraintNaming == null) {
+      this.constraintNaming = serverConfig.getConstraintNaming();
+    }
+  }
+
+  /**
+   * Set the specific platform to generate DDL for.
+   * <p>
+   * If not set this defaults to the platform of the default server.
+   * </p>
+   */
+  public void setPlatform(DbPlatformName platform) {
+    setPlatform(getPlatform(platform));
+  }
+
+  /**
+   * Set the specific platform to generate DDL for.
+   * <p>
+   * If not set this defaults to the platform of the default server.
+   * </p>
+   */
+  public void setPlatform(DatabasePlatform databasePlatform) {
+    this.databasePlatform = databasePlatform;
+    DbOffline.setPlatform(databasePlatform.getName());
+  }
+
+  /**
+   * Add an additional platform to write the migration DDL.
+   * <p>
+   * Use this when you want to generate sql scripts for multiple database platforms
+   * from the migration (e.g. generate migration sql for MySql, Postgres and Oracle).
+   * </p>
+   */
+  public void addPlatform(DbPlatformName platform, String prefix) {
+    if (!prefix.endsWith("-")) {
+      prefix += "-";
+    }
+    platforms.add(new Pair(getPlatform(platform), prefix));
+  }
+
+  /**
+   * Generate the next migration xml file and associated apply and rollback sql scripts.
+   * <p>
+   *   This does not run the migration or ddl scripts but just generates them.
+   * </p>
+   * <h3>Example: Run for a single specific platform</h3>
+   * <pre>{@code
+   *
+   *       DbMigration migration = new DbMigration();
+   *       migration.setPathToResources("src/main/resources");
+   *       migration.setPlatform(DbPlatformName.ORACLE);
+   *
+   *       migration.generateMigration();
+   *
+   * }</pre>
+   *
+   * <h3>Example: Run migration generating DDL for multiple platforms</h3>
+   * <pre>{@code
+   *
+   *       DbMigration migration = new DbMigration();
+   *       migration.setPathToResources("src/main/resources");
+   *
+   *       migration.addPlatform(DbPlatformName.POSTGRES, "pg");
+   *       migration.addPlatform(DbPlatformName.MYSQL, "mysql");
+   *       migration.addPlatform(DbPlatformName.ORACLE, "mysql");
+   *
+   *       migration.generateMigration();
+   *
+   * }</pre>
+   */
+  public void generateMigration() throws IOException {
+
+    // use this flag to stop other plugins like full DDL generation
+    DbOffline.setRunningMigration();
+
+    setDefaults();
+
+    try {
+      MigrationModel migrationModel = new MigrationModel(migrationConfig.getResourcePath());
+      ModelContainer migrated = migrationModel.read();
+      int nextMajorVersion = migrationModel.getNextMajorVersion();
+
+      logger.info("next migration version {}", nextMajorVersion);
+
+      CurrentModel currentModel = new CurrentModel(server, constraintNaming);
+      ModelContainer current = currentModel.read();
+
+      ModelDiff diff = new ModelDiff(migrated);
+      diff.compareTo(current);
+
+      if (diff.isEmpty()) {
+        logger.info("no changes detected - no migration written");
+        return;
+      }
+
+      // there were actually changes to write
+      Migration dbMigration = diff.getMigration();
+
+      File writePath = getWritePath();
+      logger.info("migration writing version {} to {}", nextMajorVersion, writePath.getAbsolutePath());
+      writeMigrationXml(dbMigration, writePath, nextMajorVersion);
+
+      if (databasePlatform != null) {
+        // writer needs the current model to provide table/column details for
+        // history ddl generation (triggers, history tables etc)
+        DdlWrite write = new DdlWrite(new MConfiguration(), currentModel.read());
+        PlatformDdlWriter writer = new PlatformDdlWriter(databasePlatform, serverConfig);
+        writer.processMigration(dbMigration, write, writePath, nextMajorVersion);
+      }
+
+      writeExtraPlatformDdl(nextMajorVersion, currentModel, dbMigration, writePath);
+
+    } finally {
+      DbOffline.reset();
+    }
+  }
+
+  /**
+   * Write any extra platform ddl.
+   */
+  protected void writeExtraPlatformDdl(int nextMajorVersion, CurrentModel currentModel, Migration dbMigration, File writePath) throws IOException {
+
+    for (Pair pair : platforms) {
+      DdlWrite platformBuffer = new DdlWrite(new MConfiguration(), currentModel.read());
+
+      PlatformDdlWriter platformWriter = new PlatformDdlWriter(pair.platform, serverConfig, pair.prefix);
+      platformWriter.processMigration(dbMigration, platformBuffer, writePath, nextMajorVersion);
+    }
+  }
+
+  /**
+   * Write the migration xml.
+   */
+  protected void writeMigrationXml(Migration dbMigration, File resourcePath, int migrationVersion) {
+
+    File file = new File(resourcePath, "v"+migrationVersion+".0.xml");
+    MigrationXmlWriter xmlWriter = new MigrationXmlWriter();
+    xmlWriter.write(dbMigration, file);
+  }
+
+  /**
+   * Set default server and platform if necessary.
+   */
+  protected void setDefaults() {
+    if (server == null) {
+      setServer(Ebean.getDefaultServer());
+    }
+    if (databasePlatform == null && platforms.isEmpty()) {
+      // not explicitly set not set a list of platforms so
+      // default to the platform of the default server
+      databasePlatform = server.getDatabasePlatform();
+      logger.debug("set platform to {}", databasePlatform.getName());
+    }
+  }
+
+  /**
+   * Return the file path to write the xml and sql to.
+   */
+  protected File getWritePath() {
+
+    // path to src/main/resources in typical maven project
+    File resourceRootDir = new File(pathToResources);
+
+    String resourcePath = migrationConfig.getResourcePath();
+
+    // expect to be a path to something like - src/main/resources/dbmigration/myapp
+    File path = new File(resourceRootDir, resourcePath);
+    if (!path.exists()) {
+      if (!path.mkdirs()) {
+        logger.debug("Unable to ensure migration directory exists at {}", path.getAbsolutePath());
+      }
+    }
+    return path;
+  }
+
+  /**
+   * Return the DatabasePlatform given the platform key.
+   */
+  protected DatabasePlatform getPlatform(DbPlatformName platform) {
+    switch (platform) {
+      case H2:
+        return new H2Platform();
+      case POSTGRES:
+        return new PostgresPlatform();
+      case MYSQL:
+        return new MySqlPlatform();
+      case ORACLE:
+        return new OraclePlatform();
+      case SQLSERVER:
+        return new MsSqlServer2005Platform();
+      case DB2:
+        return new DB2Platform();
+      case SQLITE:
+        return new SQLitePlatform();
+
+      default:
+        throw new IllegalArgumentException("Platform missing? " + platform);
+    }
+  }
+
+  /**
+   * Holds a platform and prefix. Used to generate multiple platform specific DDL
+   * for a single migration.
+   */
+  public static class Pair {
+
+    /**
+     * The platform to generate the DDL for.
+     */
+    public final DatabasePlatform platform;
+
+    /**
+     * A prefix included into the file/resource names indicating the platform.
+     */
+    public final String prefix;
+
+    public Pair(DatabasePlatform platform, String prefix) {
+      this.platform = platform;
+      this.prefix = prefix;
+    }
+  }
+
+}

src/main/java/com/avaje/ebean/dbmigration/DbOffline.java

@@ -0,0 +1,79 @@
+package com.avaje.ebean.dbmigration;
+
+import com.avaje.ebean.config.dbplatform.DbPlatformName;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Helper to indicate that an EbeanServer should come up offline
+ * typically for DDL generation purposes.
+ */
+public class DbOffline {
+
+  private static final Logger logger = LoggerFactory.getLogger(DbOffline.class);
+
+  private static final String KEY = "ebean.dboffline";
+
+  private static boolean runningMigration;
+
+  /**
+   * Set the platform to use when creating the next EbeanServer instance.
+   */
+  public static void setPlatform(DbPlatformName dbPlatform) {
+    System.setProperty(KEY, dbPlatform.name());
+  }
+
+  /**
+   * Set the platform to use when creating the next EbeanServer instance.
+   */
+  public static void setPlatform(String platformName) {
+    System.setProperty(KEY, platformName);
+  }
+
+  /**
+   * Return the platform to use when creating the next EbeanServer instance.
+   */
+  public static String getPlatform() {
+    return System.getProperty(KEY);
+  }
+
+  /**
+   * Bring up the next EbeanServer instance using the H2 platform.
+   */
+  public static void asH2() {
+    setPlatform(DbPlatformName.H2);
+  }
+
+  /**
+   * Return true if the offline platform has been set.
+   */
+  public static boolean isSet() {
+    return getPlatform() != null;
+  }
+
+  /**
+   * Return true if the migration is running. This typically means don't run the
+   * plugins like full DDL generation.
+   */
+  public static boolean isRunningMigration() {
+    return runningMigration;
+  }
+
+  /**
+   * Called when the migration is running is order to stop other plugins
+   * like the full DDL generation from executing.
+   */
+  public static void setRunningMigration() {
+    runningMigration = true;
+  }
+
+  /**
+   * Reset the offline platform and runningMigration flag.
+   */
+  public static void reset() {
+    runningMigration = false;
+    System.clearProperty(KEY);
+    logger.debug("reset");
+  }
+
+}

src/main/java/com/avaje/ebean/dbmigration/DdlGenerator.java

@@ -1,5 +1,14 @@
-package com.avaje.ebeaninternal.server.ddl;
+package com.avaje.ebean.dbmigration;
 
+import com.avaje.ebean.Transaction;
+import com.avaje.ebean.config.ServerConfig;
+import com.avaje.ebean.dbmigration.model.CurrentModel;
+import com.avaje.ebeaninternal.api.SpiEbeanPlugin;
+import com.avaje.ebeaninternal.api.SpiEbeanServer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.persistence.PersistenceException;
 import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileReader;
@@ -13,18 +22,6 @@ import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.List;
 
-import javax.persistence.PersistenceException;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import com.avaje.ebean.Transaction;
-import com.avaje.ebean.config.NamingConvention;
-import com.avaje.ebean.config.ServerConfig;
-import com.avaje.ebean.config.dbplatform.DatabasePlatform;
-import com.avaje.ebeaninternal.api.SpiEbeanPlugin;
-import com.avaje.ebeaninternal.api.SpiEbeanServer;
-
 /**
  * Controls the generation of DDL and potentially runs the resulting scripts.
  */
@@ -34,24 +31,17 @@ public class DdlGenerator implements SpiEbeanPlugin {
 
   private SpiEbeanServer server;
 
-  private DatabasePlatform dbPlatform;
-
-  private int summaryLength = 80;
-
   private boolean generateDdl;
   private boolean runDdl;
 
+  private CurrentModel currentModel;
   private String dropContent;
   private String createContent;
 
-  private NamingConvention namingConvention;
-
-  public void setup(SpiEbeanServer server, DatabasePlatform dbPlatform, ServerConfig serverConfig) {
+  public void setup(SpiEbeanServer server, ServerConfig serverConfig) {
     this.server = server;
-    this.dbPlatform = dbPlatform;
     this.generateDdl = serverConfig.isDdlGenerate();
     this.runDdl = serverConfig.isDdlRun();
-    this.namingConvention = serverConfig.getNamingConvention();
   }
 
   /**
@@ -103,10 +93,8 @@ public class DdlGenerator implements SpiEbeanPlugin {
     try {
       String c = generateDropDdl();
       writeFile(dropFile, c);
-
     } catch (IOException e) {
-      String msg = "Error generating Drop DDL";
-      throw new PersistenceException(msg, e);
+      throw new PersistenceException("Error generating Drop DDL", e);
     }
   }
 
@@ -115,65 +103,44 @@ public class DdlGenerator implements SpiEbeanPlugin {
     try {
       String c = generateCreateDdl();
       writeFile(createFile, c);
-
     } catch (IOException e) {
-      String msg = "Error generating Create DDL";
-      throw new PersistenceException(msg, e);
+      throw new PersistenceException("Error generating Create DDL", e);
     }
   }
 
   public String generateDropDdl() {
 
-    DdlGenContext ctx = createContext();
-
-    if (ctx.getDdlSyntax().isDropKeyConstraints()) {
-      // generate drop foreign key constraint statements (sql server joy)
-      AddForeignKeysVisitor fkeys = new AddForeignKeysVisitor(false, ctx);
-      VisitorUtil.visit(server, fkeys);
-      ctx.writeNewLine();
+    try {
+      dropContent = currentModel().getDropDdl();
+      return dropContent;
+    } catch (IOException e) {
+      throw new RuntimeException(e);
     }
-
-    DropTableVisitor drop = new DropTableVisitor(ctx);
-    VisitorUtil.visit(server, drop);
-
-    DropSequenceVisitor dropSequence = new DropSequenceVisitor(ctx);
-    VisitorUtil.visit(server, dropSequence);
-
-    ctx.flush();
-    dropContent = ctx.getContent();
-    return dropContent;
   }
 
   public String generateCreateDdl() {
 
-    DdlGenContext ctx = createContext();
-    CreateTableVisitor create = new CreateTableVisitor(ctx);
-    VisitorUtil.visit(server, create);
-
-    CreateSequenceVisitor createSequence = new CreateSequenceVisitor(ctx);
-    VisitorUtil.visit(server, createSequence);
-
-    AddForeignKeysVisitor fkeys = new AddForeignKeysVisitor(true, ctx);
-    VisitorUtil.visit(server, fkeys);
-
-    CreateIndexVisitor indexes = new CreateIndexVisitor(ctx);
-    VisitorUtil.visit(server, indexes);
-
-    ctx.flush();
-    createContent = ctx.getContent();
-    return createContent;
+    try {
+      createContent = currentModel().getCreateDdl();
+      return createContent;
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
   }
 
   protected String getDropFileName() {
-    return server.getName() + "-drop.sql";
+    return server.getName() + "-drop-all.sql";
   }
 
   protected String getCreateFileName() {
-    return server.getName() + "-create.sql";
+    return server.getName() + "-create-all.sql";
   }
 
-  protected DdlGenContext createContext() {
-    return new DdlGenContext(dbPlatform, namingConvention);
+  protected CurrentModel currentModel() {
+    if (currentModel == null) {
+      currentModel = new CurrentModel(server);
+    }
+    return currentModel;
   }
 
   protected void writeFile(String fileName, String fileContent) throws IOException {
@@ -201,7 +168,7 @@ public class DdlGenerator implements SpiEbeanPlugin {
     FileReader fr = new FileReader(f);
     LineNumberReader lr = new LineNumberReader(fr);
     try {
-      String s = null;
+      String s;
       while ((s = lr.readLine()) != null) {
         buf.append(s).append("\n");
       }
@@ -233,8 +200,7 @@ public class DdlGenerator implements SpiEbeanPlugin {
       t.commit();
 
     } catch (Exception e) {
-      String msg = "Error: " + e.getMessage();
-      throw new PersistenceException(msg, e);
+      throw new PersistenceException("Error: " + e.getMessage(), e);
     } finally {
       t.end();
     }
@@ -274,7 +240,7 @@ public class DdlGenerator implements SpiEbeanPlugin {
         stmt = stmt.substring(0, stmt.length() - 1);
       }
 
-      logger.trace("executing " + oneOf + " " + getSummary(stmt));
+      logger.info("executing " + oneOf + " " + getSummary(stmt));
 
       pstmt = c.prepareStatement(stmt);
       pstmt.execute();
@@ -297,6 +263,74 @@ public class DdlGenerator implements SpiEbeanPlugin {
     }
   }
 
+  /**
+   * Local utility used to detect the end of statements / separate statements.
+   * This is often just the semicolon character but for trigger/procedures this
+   * detects the $$ demarcation used in the history DDL generation for MySql and
+   * Postgres.
+   */
+  static class StatementsSeparator {
+
+    ArrayList<String> statements = new ArrayList<String>();
+
+    boolean trimDelimiter;
+
+    boolean inDbProcedure;
+
+    StringBuilder sb = new StringBuilder();
+
+    void lineContainsDollars(String line) {
+      if (inDbProcedure) {
+        if (trimDelimiter) {
+          line = line.replace("$$","");
+        }
+        endOfStatement(line);
+      } else {
+        // MySql style delimiter needs to be trimmed/removed
+        trimDelimiter = line.equals("delimiter $$");
+        if (!trimDelimiter) {
+          sb.append(line).append(" ");
+        }
+      }
+      inDbProcedure = !inDbProcedure;
+    }
+
+    void endOfStatement(String line) {
+      // end of Db procedure
+      sb.append(line);
+      statements.add(sb.toString().trim());
+      sb = new StringBuilder();
+    }
+
+    void nextLine(String line) {
+
+      if (line.contains("$$")) {
+        lineContainsDollars(line);
+        return;
+      }
+
+      if (inDbProcedure) {
+        sb.append(line).append(" ");
+        return;
+      }
+
+      int semiPos = line.indexOf(';');
+      if (semiPos == -1) {
+        sb.append(line).append(" ");
+
+      } else if (semiPos == line.length() - 1) {
+        // semicolon at end of line
+        endOfStatement(line);
+
+      } else {
+        // semicolon in middle of line
+        String preSemi = line.substring(0, semiPos);
+        endOfStatement(preSemi);
+        sb.append(line.substring(semiPos + 1));
+      }
+    }
+  }
+
   /**
    * Break up the sql in reader into a list of statements using the semi-colon
    * character;
@@ -305,43 +339,24 @@ public class DdlGenerator implements SpiEbeanPlugin {
 
     try {
       BufferedReader br = new BufferedReader(reader);
+      StatementsSeparator statements = new StatementsSeparator();
 
-      ArrayList<String> statements = new ArrayList<String>();
-
-      StringBuilder sb = new StringBuilder();
       String s;
       while ((s = br.readLine()) != null) {
         s = s.trim();
-        int semiPos = s.indexOf(';');
-        if (semiPos == -1) {
-          sb.append(s).append(" ");
-
-        } else if (semiPos == s.length() - 1) {
-          // semicolon at end of line
-          sb.append(s);
-          statements.add(sb.toString().trim());
-          sb = new StringBuilder();
-
-        } else {
-          // semicolon in middle of line
-          String preSemi = s.substring(0, semiPos);
-          sb.append(preSemi);
-          statements.add(sb.toString().trim());
-          sb = new StringBuilder();
-          sb.append(s.substring(semiPos + 1));
-
-        }
+        statements.nextLine(s);
       }
 
-      return statements;
+      return statements.statements;
+
     } catch (IOException e) {
       throw new PersistenceException(e);
     }
   }
 
   private String getSummary(String s) {
-    if (s.length() > summaryLength) {
-      return s.substring(0, summaryLength).trim() + "...";
+    if (s.length() > 80) {
+      return s.substring(0, 80).trim() + "...";
     }
     return s;
   }

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/BaseDdlHandler.java

@@ -0,0 +1,108 @@
+package com.avaje.ebean.dbmigration.ddlgeneration;
+
+import com.avaje.ebean.config.ServerConfig;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.BaseTableDdl;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.PlatformDdl;
+import com.avaje.ebean.dbmigration.migration.AddColumn;
+import com.avaje.ebean.dbmigration.migration.AddHistoryTable;
+import com.avaje.ebean.dbmigration.migration.AlterColumn;
+import com.avaje.ebean.dbmigration.migration.ChangeSet;
+import com.avaje.ebean.dbmigration.migration.CreateIndex;
+import com.avaje.ebean.dbmigration.migration.CreateTable;
+import com.avaje.ebean.dbmigration.migration.DropColumn;
+import com.avaje.ebean.dbmigration.migration.DropHistoryTable;
+import com.avaje.ebean.dbmigration.migration.DropIndex;
+import com.avaje.ebean.dbmigration.migration.DropTable;
+
+import java.io.IOException;
+import java.util.List;
+
+/**
+ *
+ */
+public class BaseDdlHandler implements DdlHandler {
+
+  protected final TableDdl tableDdl;
+
+  public BaseDdlHandler(ServerConfig serverConfig, PlatformDdl platformDdl) {
+    this.tableDdl = new BaseTableDdl(serverConfig, platformDdl);
+  }
+
+  @Override
+  public void generate(DdlWrite writer, ChangeSet changeSet) throws IOException {
+
+    List<Object> changeSetChildren = changeSet.getChangeSetChildren();
+    for (Object change : changeSetChildren) {
+      if (change instanceof CreateTable) {
+        generate(writer, (CreateTable) change);
+      } else if (change instanceof DropTable) {
+        generate(writer, (DropTable) change);
+      } else if (change instanceof CreateIndex) {
+        generate(writer, (CreateIndex) change);
+      } else if (change instanceof DropIndex) {
+        generate(writer, (DropIndex) change);
+      } else if (change instanceof AddColumn) {
+        generate(writer, (AddColumn) change);
+      } else if (change instanceof DropColumn) {
+        generate(writer, (DropColumn) change);
+      } else if (change instanceof AlterColumn) {
+        generate(writer, (AlterColumn) change);
+      } else if (change instanceof AddHistoryTable) {
+        generate(writer, (AddHistoryTable) change);
+      } else if (change instanceof DropHistoryTable) {
+        generate(writer, (DropHistoryTable) change);
+      }
+    }
+  }
+
+  @Override
+  public void generateExtra(DdlWrite write) throws IOException {
+    tableDdl.generateExtra(write);
+  }
+
+  @Override
+  public void generate(DdlWrite writer, CreateTable createTable) throws IOException {
+    tableDdl.generate(writer, createTable);
+  }
+
+  @Override
+  public void generate(DdlWrite writer, DropTable dropTable) throws IOException {
+    tableDdl.generate(writer, dropTable);
+  }
+
+  @Override
+  public void generate(DdlWrite writer, AddColumn addColumn) throws IOException {
+    tableDdl.generate(writer, addColumn);
+  }
+
+  @Override
+  public void generate(DdlWrite writer, DropColumn dropColumn) throws IOException {
+    tableDdl.generate(writer, dropColumn);
+  }
+
+  @Override
+  public void generate(DdlWrite writer, AlterColumn alterColumn) throws IOException {
+    tableDdl.generate(writer, alterColumn);
+  }
+
+  @Override
+  public void generate(DdlWrite writer, AddHistoryTable addHistoryTable) throws IOException {
+    tableDdl.generate(writer, addHistoryTable);
+  }
+
+  @Override
+  public void generate(DdlWrite writer, DropHistoryTable dropHistoryTable) throws IOException {
+    tableDdl.generate(writer, dropHistoryTable);
+  }
+
+  @Override
+  public void generate(DdlWrite writer, CreateIndex createIndex) throws IOException {
+    tableDdl.generate(writer, createIndex);
+  }
+
+  @Override
+  public void generate(DdlWrite writer, DropIndex dropIndex) throws IOException {
+    tableDdl.generate(writer, dropIndex);
+  }
+
+}

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/ColumnDdl.java

@@ -0,0 +1,28 @@
+package com.avaje.ebean.dbmigration.ddlgeneration;
+
+import com.avaje.ebean.dbmigration.migration.AddColumn;
+import com.avaje.ebean.dbmigration.migration.AlterColumn;
+import com.avaje.ebean.dbmigration.migration.DropColumn;
+
+import java.io.IOException;
+
+/**
+ * Write DDL for AddColumn , DropColumn or AlterColumn.
+ */
+public interface ColumnDdl {
+
+  /**
+   * Write the add column change.
+   */
+  void generate(DdlWrite writer, AddColumn addColumn) throws IOException;
+
+  /**
+   * Write the drop column change.
+   */
+  void generate(DdlWrite writer, DropColumn dropColumn) throws IOException;
+
+  /**
+   * Write the alter column changes.
+   */
+  void generate(DdlWrite writer, AlterColumn alterColumn) throws IOException;
+}

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/DdlBuffer.java

@@ -0,0 +1,57 @@
+package com.avaje.ebean.dbmigration.ddlgeneration;
+
+import com.avaje.ebean.dbmigration.model.MConfiguration;
+
+import java.io.IOException;
+
+/**
+ * Buffer to append generated DDL to.
+ */
+public interface DdlBuffer {
+
+  /**
+   * Return the configuration (default tablespaces etc).
+   */
+  MConfiguration getConfiguration();
+
+  /**
+   * Return true if the buffer is empty.
+   */
+  boolean isEmpty();
+
+  /**
+   * Append DDL content to the buffer.
+   */
+  DdlBuffer append(String content) throws IOException;
+
+  /**
+   * Append DDL content to the buffer with space padding.
+   */
+  DdlBuffer append(String type, int space) throws IOException;
+
+  /**
+   * Append a value that is potentially null or empty and proceed it with a space if so.
+   */
+  DdlBuffer appendWithSpace(String foreignKeyRestrict) throws IOException;
+
+  /**
+   * Append new line character to the buffer.
+   */
+  DdlBuffer newLine() throws IOException;
+
+  /**
+   * Append the end of statement content.
+   */
+  DdlBuffer endOfStatement() throws IOException;
+
+  /**
+   * End of a change - add some whitespace.
+   */
+  DdlBuffer end() throws IOException;
+
+  /**
+   * Return the buffer content.
+   */
+  String getBuffer();
+
+}

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/DdlHandler.java

@@ -0,0 +1,41 @@
+package com.avaje.ebean.dbmigration.ddlgeneration;
+
+import com.avaje.ebean.dbmigration.migration.AddColumn;
+import com.avaje.ebean.dbmigration.migration.AddHistoryTable;
+import com.avaje.ebean.dbmigration.migration.AlterColumn;
+import com.avaje.ebean.dbmigration.migration.ChangeSet;
+import com.avaje.ebean.dbmigration.migration.CreateIndex;
+import com.avaje.ebean.dbmigration.migration.CreateTable;
+import com.avaje.ebean.dbmigration.migration.DropColumn;
+import com.avaje.ebean.dbmigration.migration.DropHistoryTable;
+import com.avaje.ebean.dbmigration.migration.DropIndex;
+import com.avaje.ebean.dbmigration.migration.DropTable;
+
+import java.io.IOException;
+
+/**
+ */
+public interface DdlHandler {
+
+  void generate(DdlWrite writer, ChangeSet changeSet) throws IOException;
+
+  void generate(DdlWrite writer, CreateTable createTable) throws IOException;
+
+  void generate(DdlWrite writer, DropTable dropTable) throws IOException;
+
+  void generate(DdlWrite writer, AddColumn addColumn) throws IOException;
+
+  void generate(DdlWrite writer, DropColumn dropColumn) throws IOException;
+
+  void generate(DdlWrite writer, AlterColumn alterColumn) throws IOException;
+
+  void generate(DdlWrite writer, AddHistoryTable addHistoryTable) throws IOException;
+
+  void generate(DdlWrite writer, DropHistoryTable dropHistoryTable) throws IOException;
+
+  void generate(DdlWrite writer, CreateIndex createIndex) throws IOException;
+
+  void generate(DdlWrite writer, DropIndex dropIndex) throws IOException;
+
+  void generateExtra(DdlWrite write) throws IOException;
+}

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/DdlWrite.java

@@ -0,0 +1,160 @@
+package com.avaje.ebean.dbmigration.ddlgeneration;
+
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.BaseDdlBuffer;
+import com.avaje.ebean.dbmigration.model.MConfiguration;
+import com.avaje.ebean.dbmigration.model.MTable;
+import com.avaje.ebean.dbmigration.model.ModelContainer;
+
+/**
+ * Write context holding the buffers for both apply and rollback DDL.
+ */
+public class DdlWrite {
+
+  private final ModelContainer currentModel;
+
+  private final DdlBuffer apply;
+
+  private final DdlBuffer applyForeignKeys;
+
+  private final DdlBuffer applyHistory;
+
+  private final DdlBuffer rollbackForeignKeys;
+
+  private final DdlBuffer rollback;
+
+  /**
+   * For DDL that drops tables and columns etc.
+   *
+   * This DDL typically can not run automatically in production as there is most commonly
+   * existing servers running the application using these tables and columns. Typically
+   * these drop statements may be executed AFTER all the servers in the application have
+   * migrated onto new code.
+   */
+  private final DdlBuffer drop;
+
+  /**
+   * For use when History is turned off for a base table or history is no longer
+   * desired on specific columns. This DDL should typically execute manually after review
+   * by DBA's.
+   */
+  private final DdlBuffer dropHistory;
+
+  /**
+   * Create without any configuration or current model (no history support).
+   */
+  public DdlWrite() {
+    this(new MConfiguration(), new ModelContainer());
+  }
+
+  /**
+   * Create with a configuration.
+   */
+  public DdlWrite(MConfiguration configuration, ModelContainer currentModel) {
+    this.currentModel = currentModel;
+    this.apply = new BaseDdlBuffer(configuration);
+    this.applyForeignKeys = new BaseDdlBuffer(configuration);
+    this.applyHistory = new BaseDdlBuffer(configuration);
+    this.rollbackForeignKeys = new BaseDdlBuffer(configuration);
+    this.rollback = new BaseDdlBuffer(configuration);
+    this.drop = new BaseDdlBuffer(configuration);
+    this.dropHistory = new BaseDdlBuffer(configuration);
+  }
+
+  /**
+   * Return the Table information from the current model.
+   * <p>
+   * This is typically required for the history support (used to determine the list of columns
+   * included in the history when creating or recreating the associated trigger/stored procedure).
+   * </p>
+   */
+  public MTable getTable(String tableName) {
+    return currentModel.getTable(tableName);
+  }
+
+  /**
+   * Return true if the apply buffers are all empty.
+   */
+  public boolean isApplyEmpty() {
+    return apply.getBuffer().isEmpty()
+        && applyForeignKeys.getBuffer().isEmpty()
+        && applyHistory.getBuffer().isEmpty();
+  }
+
+  /**
+   * Return true if the apply rollback buffers are all empty.
+   */
+  public boolean isApplyRollbackEmpty() {
+    return rollback.getBuffer().isEmpty()
+        && rollbackForeignKeys.getBuffer().isEmpty();
+  }
+
+  /**
+   * Return true the drop buffers are empty.
+   */
+  public boolean isDropEmpty() {
+    return drop.getBuffer().isEmpty() && dropHistory.getBuffer().isEmpty();
+  }
+
+  /**
+   * Return the buffer that APPLY DDL is written to.
+   */
+  public DdlBuffer apply() {
+    return apply;
+  }
+
+  /**
+   * Return the buffer that APPLY DDL is written to for foreign keys and their associated indexes.
+   * <p>
+   * Statements added to this buffer are executed after all the normal apply statements and
+   * typically 'add foreign key' is added to this buffer.
+   */
+  public DdlBuffer applyForeignKeys() {
+    return applyForeignKeys;
+  }
+
+  /**
+   * Return the buffer that apply history DDL is written to.
+   */
+  public DdlBuffer applyHistory() {
+    return applyHistory;
+  }
+
+  /**
+   * Return the buffer that ROLLBACK DDL is written to for foreign keys and associated indexes.
+   */
+  public DdlBuffer rollbackForeignKeys() {
+    return rollbackForeignKeys;
+  }
+
+  /**
+   * Return the buffer that ROLLBACK DDL is written to which is considered safe to run when
+   * apply changes fail to execute. This will reverse the apply changes typically dropping
+   * newly created tables, foreign keys etc.
+   * <p>
+   * When apply changes are made against DB's that support transactional DDL you could argue
+   * that these rollback statements are not necessary.
+   * <p>
+   * Note that statements added to this rollback buffer are executed after foreign key rollback
+   * has been executed.
+   */
+  public DdlBuffer rollback() {
+    return rollback;
+  }
+
+  /**
+   * Return the buffer that destructive changes are written to. This is typically drop table and
+   * drop column.
+   */
+  public DdlBuffer drop() {
+    return drop;
+  }
+
+  /**
+   * Return the buffer that is used when history is no longer required on a table or specific columns.
+   */
+  public DdlBuffer dropHistory() {
+    return dropHistory;
+  }
+
+
+}