[maven-release-plugin] prepare release ebean-11.26.1

Remove the (|| multiValueSupported) part

howto-test.md

@@ -151,3 +151,18 @@ In `InsertHandler.getPstmt` the `meta.getIdentityDbColumns()` contains
 TODO: not yet tested
 
 
+
+'hana' platform
+--------------------
+
+Requires an installed SAP HANA server - e.g. https://store.docker.com/images/sap-hana-express-edition
+
+- Create a user `EBEAN_TEST` with password `Eb3an_test` in the tenant database `HXE`
+- Adjust the connection string and/or username in `ebean.properties`
+  
+run: `mvn clean test -Ddatasource.default=hana`
+
+Current status: PASS
+Tests run: 2486, Failures: 0, Errors: 0, Skipped: 84
+
+

pom.xml

@@ -9,7 +9,7 @@
 
   <groupId>io.ebean</groupId>
   <artifactId>ebean</artifactId>
-  <version>11.18.2</version>
+  <version>11.26.1</version>
   <packaging>jar</packaging>
 
   <name>ebean</name>
@@ -22,7 +22,7 @@
 
   <scm>
     <developerConnection>scm:git:git@github.com:ebean-orm/ebean.git</developerConnection>
-    <tag>ebean-11.18.2</tag>
+    <tag>ebean-11.26.1</tag>
   </scm>
 
   <profiles>
@@ -117,13 +117,13 @@
     <dependency>
       <groupId>io.ebean</groupId>
       <artifactId>ebean-annotation</artifactId>
-      <version>4.1</version>
+      <version>4.3</version>
     </dependency>
 
     <dependency>
-      <groupId>org.avaje</groupId>
-      <artifactId>avaje-datasource</artifactId>
-      <version>3.2.2</version>
+      <groupId>io.ebean</groupId>
+      <artifactId>ebean-datasource</artifactId>
+      <version>4.2.2</version>
     </dependency>
 
     <dependency>
@@ -135,7 +135,7 @@
     <dependency>
       <groupId>io.ebean</groupId>
       <artifactId>ebean-migration</artifactId>
-      <version>11.6.1</version>
+      <version>11.10.1</version>
     </dependency>
 
     <dependency>
@@ -229,7 +229,7 @@
     <dependency>
       <groupId>io.ebean</groupId>
       <artifactId>ebean-agent</artifactId>
-      <version>11.11.1</version>
+      <version>11.25.1</version>
       <scope>test</scope>
     </dependency>
 
@@ -271,6 +271,13 @@
       <scope>test</scope>
     </dependency>
 
+    <dependency>
+      <groupId>com.sap.cloud.db.jdbc</groupId>
+      <artifactId>ngdbc</artifactId>
+      <version>2.3.48</version>
+      <scope>test</scope>
+    </dependency>
+
     <dependency>
       <groupId>org.avaje.composite</groupId>
       <artifactId>avaje-composite-testing</artifactId>
@@ -302,7 +309,7 @@
       <plugin>
         <groupId>io.ebean</groupId>
         <artifactId>ebean-maven-plugin</artifactId>
-        <version>11.11.1</version>
+        <version>11.25.1</version>
         <executions>
           <execution>
             <id>test</id>
@@ -360,7 +367,7 @@
         <artifactId>maven-javadoc-plugin</artifactId>
         <version>2.9.1</version>
         <configuration>
-          <doctitle>Ebean 10</doctitle>
+          <doctitle>Ebean 11</doctitle>
           <overview>src/main/java/io/ebean/overview.html</overview>
           <source>1.8</source>
           <doclet>org.avaje.doclet.PygmentsDoclet</doclet>

src/main/java/io/ebean/Ebean.java

@@ -2,10 +2,12 @@ package io.ebean;
 
 import io.ebean.annotation.TxIsolation;
 import io.ebean.cache.ServerCacheManager;
+import io.ebean.config.BeanNotEnhancedException;
 import io.ebean.config.ServerConfig;
 import io.ebean.plugin.Property;
 import io.ebean.text.csv.CsvReader;
 import io.ebean.text.json.JsonContext;
+import io.ebean.datasource.DataSourceConfigurationException;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -160,6 +162,15 @@ public final class Ebean {
             defaultServer = getWithCreate(defaultName.trim());
           }
         }
+      } catch (BeanNotEnhancedException e) {
+        throw e;
+
+      } catch (DataSourceConfigurationException e) {
+        String msg = "Configuration error creating DataSource for the default EbeanServer." +
+          " This typically means a missing application-test.yml or missing ebean-test-config dependency." +
+          " See https://ebean.io/docs/trouble-shooting#datasource";
+        throw new DataSourceConfigurationException(msg, e);
+
       } catch (Throwable e) {
         logger.error("Error trying to create the default EbeanServer", e);
         throw new RuntimeException(e);

src/main/java/io/ebean/EbeanServer.java

@@ -11,17 +11,13 @@ import io.ebean.text.json.JsonContext;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
-import javax.persistence.NonUniqueResultException;
 import javax.persistence.OptimisticLockException;
 import javax.persistence.PersistenceException;
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
-import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.Callable;
-import java.util.function.Consumer;
-import java.util.function.Predicate;
 
 /**
  * Provides the API for fetching and saving beans to a particular DataSource.

src/main/java/io/ebean/ExpressionList.java

@@ -166,6 +166,18 @@ public interface ExpressionList<T> {
    */
   int delete();
 
+  /**
+   * 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 rows that were deleted.
+   */
+  int delete(Transaction transaction);
+
   /**
    * Execute as a update query.
    *
@@ -174,6 +186,14 @@ public interface ExpressionList<T> {
    */
   int update();
 
+  /**
+   * Execute as a update query with the given transaction.
+   *
+   * @return the number of rows that were updated.
+   * @see UpdateQuery
+   */
+  int update(Transaction transaction);
+
   /**
    * Execute the query iterating over the results.
    *
@@ -412,6 +432,11 @@ public interface ExpressionList<T> {
    */
   Query<T> select(String properties);
 
+  /**
+   * Apply the fetchGroup which defines what part of the object graph to load.
+   */
+  Query<T> select(FetchGroup<T> fetchGroup);
+
   /**
    * Set whether this query uses DISTINCT.
    * <p>

src/main/java/io/ebean/FetchGroup.java

@@ -0,0 +1,114 @@
+package io.ebean;
+
+import javax.annotation.Nonnull;
+
+/**
+ * Defines what part of the object graph to load (select and fetch clauses).
+ * <p>
+ * Using a FetchGroup effectively sets the select() and fetch() clauses for a query. It is alternative
+ * to specifying the select() and fetch() clauses on the query allowing for more re-use of "what to load"
+ * that can be defined separately from the query and combined with other FetchGroups.
+ * </p>
+ *
+ * <h3>Select example</h3>*
+ * <pre>{@code
+ *
+ * FetchGroup<Customer> fetchGroup = FetchGroup.of(Customer.class, "name, status");
+ *
+ * Customer.query()
+ *   .select(fetchGroup)
+ *   .findList();
+ *
+ * }</pre>
+ *
+ * <h3>Select and fetch example</h3>
+ * <pre>{@code
+ *
+ * FetchGroup<Customer> fetchGroup = FetchGroup.of(Customer.class)
+ *   .select("name, status")
+ *   .fetch("contacts", "firstName, lastName, email")
+ *   .build();
+ *
+ * Customer.query()
+ *   .select(fetchGroup)
+ *   .findList();
+ *
+ * }</pre>
+ *
+ * <h3>Combining FetchGroups</h3>
+ * <p>
+ *   FetchGroups can be combined together to form another FetchGroup.
+ * </p>
+ * <pre>{@code
+ *
+ *  FetchGroup<Address> FG_ADDRESS = FetchGroup.of(Address.class)
+ *    .select("line1, line2, city")
+ *    .fetch("country", "name")
+ *    .build();
+ *
+ *  FetchGroup<Customer> FG_CUSTOMER = FetchGroup.of(Customer.class)
+ *    .select("name, version")
+ *    .fetch("billingAddress", FG_ADDRESS)
+ *    .build();
+ *
+ *
+ *  Customer.query()
+ *    .select(FG_CUSTOMER)
+ *    .findList();
+ *
+ * }</pre>
+ *
+ * @param <T> The bean type the Fetch group can be applied to
+ */
+public interface FetchGroup<T> {
+
+  /**
+   * Return the FetchGroup with the given select clause.
+   * <p>
+   *   We use this for simple FetchGroup that only select() properties and do not have additional fetch() clause.
+   * </p>
+   * <pre>{@code
+   *
+   * FetchGroup<Customer> fetchGroup = FetchGroup.of(Customer.class, "name, status");
+   *
+   * Customer.query()
+   *   .select(fetchGroup)
+   *   .findList();
+   *
+   * }</pre>
+   *
+   * @param select The select clause of the FetchGroup
+   *
+   * @return The FetchGroup with the given select clause
+   */
+  @Nonnull
+  static <T> FetchGroup<T> of(Class<T> cls, String select) {
+    return XServiceProvider.fetchGroupOf(cls, select);
+  }
+
+  /**
+   * Return the FetchGroupBuilder with the given select clause that we can add fetch clauses to.
+   * <p>
+   * We chain select() with one or more fetch() clauses to define the object graph to load.
+   * </p>
+   * <pre>{@code
+   *
+   * FetchGroup<Customer> fetchGroup = FetchGroup.of(Customer.class)
+   *   .select("name, status")
+   *   .fetch("contacts", "firstName, lastName, email")
+   *   .build();
+   *
+   * Customer.query()
+   *   .select(fetchGroup)
+   *   .findList();
+   *
+   * }</pre>
+   *
+   * @return The FetchGroupBuilder with the given select clause which we will add fetch clauses to
+   */
+  @Nonnull
+  static <T> FetchGroupBuilder<T> of(Class<T> cls) {
+    return XServiceProvider.fetchGroupOf(cls);
+  }
+
+}

src/main/java/io/ebean/FetchGroupBuilder.java

@@ -0,0 +1,93 @@
+package io.ebean;
+
+import javax.annotation.Nonnull;
+
+/**
+ * Builds a FetchGroup by adding fetch clauses.
+ * <p>
+ * We add select() and fetch() clauses to define the object graph we want to load.
+ * </p>
+ *
+ * <pre>{@code
+ *
+ * FetchGroup fetchGroup = FetchGroup
+ *   .select("name, status")
+ *   .fetch("contacts", "firstName, lastName, email")
+ *   .build();
+ *
+ * Customer.query()
+ *   .select(fetchGroup)
+ *   .where()
+ *   ...
+ *   .findList();
+ *
+ * }</pre>
+ */
+public interface FetchGroupBuilder<T> {
+
+  /**
+   * Specify specific properties to select (top level properties).
+   */
+  @Nonnull
+  FetchGroupBuilder<T> select(String select);
+
+  /**
+   * Fetch all the properties at the given path.
+   */
+  @Nonnull
+  FetchGroupBuilder<T> fetch(String path);
+
+  /**
+   * Fetch the path with the nested fetch group.
+   */
+  @Nonnull
+  FetchGroupBuilder<T> fetch(String path, FetchGroup<?> nestedGroup);
+
+  /**
+   * Fetch the path using a query join with the nested fetch group.
+   */
+  @Nonnull
+  FetchGroupBuilder<T> fetchQuery(String path, FetchGroup<?> nestedGroup);
+
+  /**
+   * Fetch the path lazily with the nested fetch group.
+   */
+  @Nonnull
+  FetchGroupBuilder<T> fetchLazy(String path, FetchGroup<?> nestedGroup);
+
+  /**
+   * Fetch the path including specified properties.
+   */
+  @Nonnull
+  FetchGroupBuilder<T> fetch(String path, String properties);
+
+  /**
+   * Fetch the path including all its properties using a query join.
+   */
+  @Nonnull
+  FetchGroupBuilder<T> fetchQuery(String path);
+
+  /**
+   * Fetch the path including specified properties using a query join.
+   */
+  @Nonnull
+  FetchGroupBuilder<T> fetchQuery(String path, String properties);
+
+  /**
+   * Fetch the path including all its properties lazily.
+   */
+  @Nonnull
+  FetchGroupBuilder<T> fetchLazy(String path);
+
+  /**
+   * Fetch the path including specified properties lazily.
+   */
+  @Nonnull
+  FetchGroupBuilder<T> fetchLazy(String path, String properties);
+
+  /**
+   * Build and return the FetchGroup.
+   */
+  @Nonnull
+  FetchGroup<T> build();
+}

src/main/java/io/ebean/MergeOptionsBuilder.java

@@ -78,6 +78,7 @@ public class MergeOptionsBuilder {
       this.deletePermanent = deletePermanent;
     }
 
+    @Override
     public Set<String> paths() {
       return paths;
     }

src/main/java/io/ebean/Model.java

@@ -2,7 +2,6 @@ package io.ebean;
 
 import io.ebean.bean.EntityBean;
 
-import javax.persistence.MappedSuperclass;
 
 /**
  * A MappedSuperclass base class that provides convenience methods for inserting, updating and
@@ -74,7 +73,6 @@ import javax.persistence.MappedSuperclass;
  *
  * }</pre>
  */
-@MappedSuperclass
 public abstract class Model {
 
   /**

src/main/java/io/ebean/OrderBy.java

@@ -1,9 +1,12 @@
 package io.ebean;
 
+import io.ebean.util.StringHelper;
+
 import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Objects;
 
 /**
  * Represents an Order By for a Query.
@@ -74,6 +77,15 @@ public final class OrderBy<T> implements Serializable {
     return query;
   }
 
+  /**
+   * Add a property with ascending order to this OrderBy.
+   */
+  public Query<T> asc(String propertyName, String collation) {
+
+    list.add(new Property(propertyName, true, collation));
+    return query;
+  }
+
   /**
    * Add a property with descending order to this OrderBy.
    */
@@ -83,6 +95,16 @@ public final class OrderBy<T> implements Serializable {
     return query;
   }
 
+  /**
+   * Add a property with descending order to this OrderBy.
+   */
+  public Query<T> desc(String propertyName, String collation) {
+
+    list.add(new Property(propertyName, false, collation));
+    return query;
+  }
+
+
   /**
    * Return true if the property is known to be contained in the order by clause.
    */
@@ -231,6 +253,8 @@ public final class OrderBy<T> implements Serializable {
 
     private boolean ascending;
 
+    private String collation;
+
     private String nulls;
 
     private String highLow;
@@ -247,17 +271,32 @@ public final class OrderBy<T> implements Serializable {
       this.highLow = highLow;
     }
 
+    public Property(String property, boolean ascending, String collation) {
+      this.property = property;
+      this.ascending = ascending;
+      this.collation = collation;
+    }
+
+    public Property(String property, boolean ascending, String collation, String nulls, String highLow) {
+      this.property = property;
+      this.ascending = ascending;
+      this.collation = collation;
+      this.nulls = nulls;
+      this.highLow = highLow;
+    }
+
     /**
      * Return a copy of this Property with the path trimmed.
      */
     public Property copyWithTrim(String path) {
-      return new Property(property.substring(path.length() + 1), ascending, nulls, highLow);
+      return new Property(property.substring(path.length() + 1), ascending, collation, nulls, highLow);
     }
 
     @Override
     public int hashCode() {
       int hc = property.hashCode();
       hc = hc * 92821 + (ascending ? 0 : 1);
+      hc = hc * 92821 + (collation == null ? 0 : collation.hashCode());
       hc = hc * 92821 + (nulls == null ? 0 : nulls.hashCode());
       hc = hc * 92821 + (highLow == null ? 0 : highLow.hashCode());
       return hc;
@@ -274,8 +313,9 @@ public final class OrderBy<T> implements Serializable {
       Property e = (Property) obj;
       if (ascending != e.ascending) return false;
       if (!property.equals(e.property)) return false;
-      if (nulls != null ? !nulls.equals(e.nulls) : e.nulls != null) return false;
-      return highLow != null ? highLow.equals(e.highLow) : e.highLow == null;
+      if (!Objects.equals(collation, e.collation)) return false;
+      if (!Objects.equals(nulls, e.nulls)) return false;
+      return Objects.equals(highLow, e.highLow);
     }
 
     @Override
@@ -284,7 +324,7 @@ public final class OrderBy<T> implements Serializable {
     }
 
     public String toStringFormat() {
-      if (nulls == null) {
+      if (nulls == null && collation == null) {
         if (ascending) {
           return property;
         } else {
@@ -292,11 +332,23 @@ public final class OrderBy<T> implements Serializable {
         }
       } else {
         StringBuilder sb = new StringBuilder();
-        sb.append(property);
+        if (collation != null)  {
+          if (collation.contains("${}")) {
+            // this is a complex collation, e.g. DB2 - we must replace the property
+            sb.append(StringHelper.replaceString(collation, "${}", property));
+          } else {
+            sb.append(property);
+            sb.append(" collate ").append(collation);
+          }
+        } else {
+          sb.append(property);
+        }
         if (!ascending) {
           sb.append(" ").append("desc");
         }
-        sb.append(" ").append(nulls).append(" ").append(highLow);
+        if (nulls != null) {
+          sb.append(" ").append(nulls).append(" ").append(highLow);
+        }
         return sb.toString();
       }
     }
@@ -319,7 +371,7 @@ public final class OrderBy<T> implements Serializable {
      * Return a copy of this property.
      */
     public Property copy() {
-      return new Property(property, ascending, nulls, highLow);
+      return new Property(property, ascending, collation, nulls, highLow);
     }
 
     /**

src/main/java/io/ebean/Pairs.java

@@ -1,6 +1,7 @@
 package io.ebean;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 /**
@@ -125,7 +126,7 @@ public class Pairs {
    * Return all the value pairs.
    */
   public List<Entry> getEntries() {
-    return entries;
+    return Collections.unmodifiableList(entries);
   }
 
   /**

src/main/java/io/ebean/Query.java

@@ -397,6 +397,11 @@ public interface Query<T> {
    */
   Query<T> select(String fetchProperties);
 
+  /**
+   * Apply the fetchGroup which defines what part of the object graph to load.
+   */
+  Query<T> select(FetchGroup<T> fetchGroup);
+
   /**
    * Specify a path to fetch eagerly including specific properties.
    * <p>
@@ -919,11 +924,31 @@ public interface Query<T> {
    */
   int delete();
 
+  /**
+   * Execute as a delete query returning the number of rows deleted using the given transaction.
+   * <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(Transaction transaction);
+
   /**
    * Execute the UpdateQuery returning the number of rows updated.
+   *
+   * @return the number of beans/rows updated.
    */
   int update();
 
+  /**
+   * Execute the UpdateQuery returning the number of rows updated using the given transaction.
+   *
+   * @return the number of beans/rows updated.
+   */
+  int update(Transaction transaction);
+
   /**
    * Return the count of entities this query should return.
    * <p>

src/main/java/io/ebean/SqlUpdate.java

@@ -98,6 +98,11 @@ public interface SqlUpdate {
   /**
    * Execute the update returning the number of rows modified.
    * <p>
+   * Note that if the transaction has batch mode on then this update will use JDBC batch and may not execute until
+   * later - at commit time or a transaction flush. In this case this method returns -1 indicating that the
+   * update has been batched for later execution.
+   * </p>
+   * <p>
    * After you have executed the SqlUpdate you can bind new variables using
    * {@link #setParameter(String, Object)} etc and then execute the SqlUpdate
    * again.
@@ -112,6 +117,11 @@ public interface SqlUpdate {
    */
   int execute();
 
+  /**
+   * Execute the statement now regardless of the JDBC batch mode of the transaction.
+   */
+  int executeNow();
+
   /**
    * Execute when addBatch() has been used to batch multiple bind executions.
    *

src/main/java/io/ebean/Transaction.java

@@ -84,7 +84,7 @@ public interface Transaction extends AutoCloseable {
    * <p>
    * This is similar to commit() but leaves the transaction "Active".
    * </p>
-   * <h3>Functions/h3>
+   * <h3>Functions</h3>
    * <ul>
    * <li>Flush the JDBC batch buffer</li>
    * <li>Call commit on the underlying JDBC connection</li>
@@ -100,7 +100,7 @@ public interface Transaction extends AutoCloseable {
    * This performs commit and completes the transaction closing underlying resources and
    * marking the transaction as "In active".
    * </p>
-   * <h3>Functions/h3>
+   * <h3>Functions</h3>
    * <ul>
    * <li>Flush the JDBC batch buffer</li>
    * <li>Call commit on the underlying JDBC connection</li>
@@ -117,7 +117,7 @@ public interface Transaction extends AutoCloseable {
    * <p>
    * This performs rollback, closes underlying resources and marks the transaction as "In active".
    * </p>
-   * <h3>Functions/h3>
+   * <h3>Functions</h3>
    * <ul>
    * <li>Call rollback on the underlying JDBC connection</li>
    * <li>Trigger any registered TransactionCallbacks</li>

src/main/java/io/ebean/XServiceProvider.java

@@ -1,5 +1,6 @@
 package io.ebean;
 
+import io.ebean.service.SpiFetchGroupService;
 import io.ebean.service.SpiProfileLocationFactory;
 import io.ebean.service.SpiRawSqlService;
 
@@ -15,6 +16,16 @@ class XServiceProvider {
 
   private static SpiProfileLocationFactory profileLocationFactory = initProfileLocation();
 
+  private static SpiFetchGroupService fetchGroupService = initSpiFetchGroupService();
+
+  private static SpiFetchGroupService initSpiFetchGroupService() {
+    Iterator<SpiFetchGroupService> loader = ServiceLoader.load(SpiFetchGroupService.class).iterator();
+    if (loader.hasNext()) {
+      return loader.next();
+    }
+    throw new IllegalStateException("No service implementation found for SpiFetchGroupService?");
+  }
+
   private static SpiRawSqlService initRawSql() {
 
     Iterator<SpiRawSqlService> loader = ServiceLoader.load(SpiRawSqlService.class).iterator();
@@ -47,4 +58,17 @@ class XServiceProvider {
     return profileLocationFactory;
   }
 
+  /**
+   * Return the FetchGroup with the given select clause.
+   */
+  static <T> FetchGroup<T> fetchGroupOf(Class<T> cls, String select) {
+    return fetchGroupService.of(cls, select);
+  }
+
+  /**
+   * Return the FetchGroupBuilder with the given select clause.
+   */
+  static <T> FetchGroupBuilder<T> fetchGroupOf(Class<T> cls) {
+    return fetchGroupService.of(cls);
+  }
 }

src/main/java/io/ebean/bean/EntityBeanIntercept.java

@@ -71,21 +71,30 @@ public final class EntityBeanIntercept implements Serializable {
   /**
    * Used when a bean is partially filled.
    */
-  private final boolean[] loadedProps;
-
-  private boolean fullyLoadedBean;
+  private static final byte FLAG_LOADED_PROP = 1;
 
   /**
    * Set of changed properties.
    */
-  private boolean[] changedProps;
+  private static final byte FLAG_CHANGED_PROP = 2;
 
   /**
    * Flags indicating if a property is a dirty embedded bean. Used to distingush
    * between an embedded bean being completely overwritten and one of its
    * embedded properties being made dirty.
    */
-  private boolean[] embeddedDirty;
+  private static final byte FLAG_EMBEDDED_DIRTY = 4;
+
+  /**
+   * Flags indicating if a property is a dirty embedded bean. Used to distingush
+   * between an embedded bean being completely overwritten and one of its
+   * embedded properties being made dirty.
+   */
+  private static final byte FLAG_ORIG_VALUE_SET = 8;
+
+  private final byte[] flags;
+
+  private boolean fullyLoadedBean;
 
   private Object[] origValues;
 
@@ -102,7 +111,7 @@ public final class EntityBeanIntercept implements Serializable {
    */
   public EntityBeanIntercept(Object ownerBean) {
     this.owner = (EntityBean) ownerBean;
-    this.loadedProps = new boolean[owner._ebean_getPropertyNames().length];
+    this.flags = new byte[owner._ebean_getPropertyNames().length];
   }
 
   /**
@@ -213,8 +222,8 @@ public final class EntityBeanIntercept implements Serializable {
    * Check each property to see if the bean is partially loaded.
    */
   public boolean isPartial() {
-    for (boolean loadedProp : loadedProps) {
-      if (!loadedProp) {
+    for (byte flag : flags) {
+      if ((flag & FLAG_LOADED_PROP) == 0) {
         return true;
       }
     }
@@ -259,10 +268,10 @@ public final class EntityBeanIntercept implements Serializable {
    * Return true if only the Id property has been loaded.
    */
   public boolean hasIdOnly(int idIndex) {
-    for (int i = 0; i < loadedProps.length; i++) {
+    for (int i = 0; i < flags.length; i++) {
       if (i == idIndex) {
-        if (!loadedProps[i]) return false;
-      } else if (loadedProps[i]) {
+        if ((flags[i] & FLAG_LOADED_PROP) == 0) return false;
+      } else if ((flags[i] & FLAG_LOADED_PROP) != 0) {
         return false;
       }
     }
@@ -284,9 +293,9 @@ public final class EntityBeanIntercept implements Serializable {
     if (idPos > -1) {
       // For cases where properties are set on constructor
       // set every non Id property to unloaded (for lazy loading)
-      for (int i = 0; i < loadedProps.length; i++) {
+      for (int i = 0; i < flags.length; i++) {
         if (i != idPos) {
-          loadedProps[i] = false;
+          flags[i] &= ~FLAG_LOADED_PROP;
         }
       }
     }
@@ -352,7 +361,9 @@ public final class EntityBeanIntercept implements Serializable {
     this.owner._ebean_setEmbeddedLoaded();
     this.lazyLoadProperty = -1;
     this.origValues = null;
-    this.changedProps = null;
+    for (int i = 0; i < flags.length; i++) {
+      flags[i] &= ~(FLAG_CHANGED_PROP + FLAG_ORIG_VALUE_SET);
+    }
     this.dirty = false;
   }
 
@@ -475,7 +486,11 @@ public final class EntityBeanIntercept implements Serializable {
     if (position == -1) {
       throw new IllegalArgumentException("Property " + propertyName + " not found");
     }
-    loadedProps[position] = loaded;
+    if (loaded) {
+      flags[position] |= FLAG_LOADED_PROP;
+    } else {
+      flags[position] &= ~FLAG_LOADED_PROP;
+    }
   }
 
   /**
@@ -483,22 +498,22 @@ public final class EntityBeanIntercept implements Serializable {
    * constructor.
    */
   public void setPropertyUnloaded(int propertyIndex) {
-    loadedProps[propertyIndex] = false;
+    flags[propertyIndex] &= ~FLAG_LOADED_PROP;
   }
 
   /**
    * Set the property to be loaded.
    */
   public void setLoadedProperty(int propertyIndex) {
-    loadedProps[propertyIndex] = true;
+    flags[propertyIndex] |= FLAG_LOADED_PROP;
   }
 
   /**
    * Set all properties to be loaded (post insert).
    */
   public void setLoadedPropertyAll() {
-    for (int i = 0; i < loadedProps.length; i++) {
-      loadedProps[i] = true;
+    for (int i = 0; i < flags.length; i++) {
+      flags[i] |= FLAG_LOADED_PROP;
     }
   }
 
@@ -506,14 +521,14 @@ public final class EntityBeanIntercept implements Serializable {
    * Return true if the property is loaded.
    */
   public boolean isLoadedProperty(int propertyIndex) {
-    return loadedProps[propertyIndex];
+    return (flags[propertyIndex] & FLAG_LOADED_PROP) != 0;
   }
 
   /**
    * Return true if the property is considered changed.
    */
   public boolean isChangedProperty(int propertyIndex) {
-    return (changedProps != null && changedProps[propertyIndex]);
+    return (flags[propertyIndex] & FLAG_CHANGED_PROP) != 0;
   }
 
   /**
@@ -521,8 +536,7 @@ public final class EntityBeanIntercept implements Serializable {
    * embedded properties is dirty.
    */
   public boolean isDirtyProperty(int propertyIndex) {
-    return (changedProps != null && changedProps[propertyIndex]
-      || embeddedDirty != null && embeddedDirty[propertyIndex]);
+    return (flags[propertyIndex] & (FLAG_CHANGED_PROP + FLAG_EMBEDDED_DIRTY)) != 0;
   }
 
   /**
@@ -534,27 +548,22 @@ public final class EntityBeanIntercept implements Serializable {
   }
 
   public void setChangedProperty(int propertyIndex) {
-    if (changedProps == null) {
-      changedProps = new boolean[owner._ebean_getPropertyNames().length];
-    }
-    changedProps[propertyIndex] = true;
+    flags[propertyIndex] |= FLAG_CHANGED_PROP;
   }
 
   /**
    * Set that an embedded bean has had one of its properties changed.
    */
   private void setEmbeddedPropertyDirty(int propertyIndex) {
-    if (embeddedDirty == null) {
-      embeddedDirty = new boolean[owner._ebean_getPropertyNames().length];
-    }
-    embeddedDirty[propertyIndex] = true;
+    flags[propertyIndex] |= FLAG_EMBEDDED_DIRTY;
   }
 
   private void setOriginalValue(int propertyIndex, Object value) {
     if (origValues == null) {
       origValues = new Object[owner._ebean_getPropertyNames().length];
     }
-    if (origValues[propertyIndex] == null) {
+    if ((flags[propertyIndex] & FLAG_ORIG_VALUE_SET) == 0) {
+      flags[propertyIndex] |= FLAG_ORIG_VALUE_SET;
       origValues[propertyIndex] = value;
     }
   }
@@ -574,13 +583,9 @@ public final class EntityBeanIntercept implements Serializable {
    */
   public void setNewBeanForUpdate() {
 
-    if (changedProps == null) {
-      changedProps = new boolean[owner._ebean_getPropertyNames().length];
-    }
-
-    for (int i = 0; i < loadedProps.length; i++) {
-      if (loadedProps[i]) {
-        changedProps[i] = true;
+    for (int i = 0; i < flags.length; i++) {
+      if ((flags[i] & FLAG_LOADED_PROP) != 0) {
+        flags[i] |= FLAG_CHANGED_PROP;
       }
     }
     setDirty(true);
@@ -594,8 +599,8 @@ public final class EntityBeanIntercept implements Serializable {
       return null;
     }
     Set<String> props = new LinkedHashSet<>();
-    for (int i = 0; i < loadedProps.length; i++) {
-      if (loadedProps[i]) {
+    for (int i = 0; i < flags.length; i++) {
+      if ((flags[i] & FLAG_LOADED_PROP) != 0) {
         props.add(getProperty(i));
       }
     }
@@ -609,12 +614,8 @@ public final class EntityBeanIntercept implements Serializable {
     int len = getPropertyLength();
     boolean[] dirties = new boolean[len];
     for (int i = 0; i < len; i++) {
-      if (changedProps != null && changedProps[i]) {
-        dirties[i] = true;
-      } else if (embeddedDirty != null && embeddedDirty[i]) {
-        // an embedded property has been changed - recurse
-        dirties[i] = true;
-      }
+      // this, or an embedded property has been changed - recurse
+      dirties[i] = (flags[i] & (FLAG_CHANGED_PROP + FLAG_EMBEDDED_DIRTY)) != 0;
     }
     return dirties;
   }
@@ -634,11 +635,11 @@ public final class EntityBeanIntercept implements Serializable {
   public void addDirtyPropertyNames(Set<String> props, String prefix) {
     int len = getPropertyLength();
     for (int i = 0; i < len; i++) {
-      if (changedProps != null && changedProps[i]) {
+      if ((flags[i] & FLAG_CHANGED_PROP) != 0) {
         // the property has been changed on this bean
         String propName = (prefix == null ? getProperty(i) : prefix + getProperty(i));
         props.add(propName);
-      } else if (embeddedDirty != null && embeddedDirty[i]) {
+      } else if ((flags[i] & FLAG_EMBEDDED_DIRTY) != 0) {
         // an embedded property has been changed - recurse
         EntityBean embeddedBean = (EntityBean) owner._ebean_getField(i);
         embeddedBean._ebean_getIntercept().addDirtyPropertyNames(props, getProperty(i) + ".");
@@ -654,12 +655,12 @@ public final class EntityBeanIntercept implements Serializable {
     String[] names = owner._ebean_getPropertyNames();
     int len = getPropertyLength();
     for (int i = 0; i < len; i++) {
-      if (changedProps != null && changedProps[i]) {
+      if ((flags[i] & FLAG_CHANGED_PROP) != 0) {
         // the property has been changed on this bean
         if (propertyNames.contains(names[i])) {
           return true;
         }
-      } else if (embeddedDirty != null && embeddedDirty[i]) {
+      } else if ((flags[i] & FLAG_EMBEDDED_DIRTY) != 0) {
         if (propertyNames.contains(names[i])) {
           return true;
         }
@@ -683,15 +684,16 @@ public final class EntityBeanIntercept implements Serializable {
   public void addDirtyPropertyValues(Map<String, ValuePair> dirtyValues, String prefix) {
     int len = getPropertyLength();
     for (int i = 0; i < len; i++) {
-      if (changedProps != null && changedProps[i]) {
+      if ((flags[i] & FLAG_CHANGED_PROP) != 0) {
         // the property has been changed on this bean
         String propName = (prefix == null ? getProperty(i) : prefix + getProperty(i));
         Object newVal = owner._ebean_getField(i);
         Object oldVal = getOrigValue(i);
+        if (!areEqual(oldVal, newVal)) {
+          dirtyValues.put(propName, new ValuePair(newVal, oldVal));
+        }
 
-        dirtyValues.put(propName, new ValuePair(newVal, oldVal));
-
-      } else if (embeddedDirty != null && embeddedDirty[i]) {
+      } else if ((flags[i] & FLAG_EMBEDDED_DIRTY) != 0) {
         // an embedded property has been changed - recurse
         EntityBean embeddedBean = (EntityBean) owner._ebean_getField(i);
         embeddedBean._ebean_getIntercept().addDirtyPropertyValues(dirtyValues, getProperty(i) + ".");
@@ -705,13 +707,15 @@ public final class EntityBeanIntercept implements Serializable {
   public void addDirtyPropertyValues(BeanDiffVisitor visitor) {
     int len = getPropertyLength();
     for (int i = 0; i < len; i++) {
-      if (changedProps != null && changedProps[i]) {
+      if ((flags[i] & FLAG_CHANGED_PROP) != 0) {
         // the property has been changed on this bean
         Object newVal = owner._ebean_getField(i);
         Object oldVal = getOrigValue(i);
-        visitor.visit(i, newVal, oldVal);
+        if (!areEqual(oldVal, newVal)) {
+          visitor.visit(i, newVal, oldVal);
+        }
 
-      } else if (embeddedDirty != null && embeddedDirty[i]) {
+      } else if ((flags[i] & FLAG_EMBEDDED_DIRTY) != 0) {
         // an embedded property has been changed - recurse
         EntityBean embeddedBean = (EntityBean) owner._ebean_getField(i);
         visitor.visitPush(i);
@@ -739,9 +743,9 @@ public final class EntityBeanIntercept implements Serializable {
     }
     int len = getPropertyLength();
     for (int i = 0; i < len; i++) {
-      if (changedProps != null && changedProps[i]) {
+      if ((flags[i] & FLAG_CHANGED_PROP) != 0) {
         sb.append(i).append(',');
-      } else if (embeddedDirty != null && embeddedDirty[i]) {
+      } else if ((flags[i] & FLAG_EMBEDDED_DIRTY) != 0) {
         // an embedded property has been changed - recurse
         EntityBean embeddedBean = (EntityBean) owner._ebean_getField(i);
         sb.append(i).append('[');
@@ -765,15 +769,12 @@ public final class EntityBeanIntercept implements Serializable {
     return sb;
   }
 
-  /**
-   * Return the set of property names for changed properties.
-   */
-  public boolean[] getChanged() {
-    return changedProps;
-  }
-
   public boolean[] getLoaded() {
-    return loadedProps;
+    boolean[] ret= new boolean[flags.length];
+    for (int i = 0; i < ret.length; i++) {
+      ret[i] = (flags[i] & FLAG_LOADED_PROP) != 0;
+    }
+    return ret;
   }
 
   /**
@@ -821,14 +822,14 @@ public final class EntityBeanIntercept implements Serializable {
    */
   private void loadBeanInternal(int loadProperty, BeanLoader loader) {
 
-    if (loadedProps == null || loadedProps[loadProperty]) {
+    if ((flags[loadProperty] & FLAG_LOADED_PROP) != 0) {
       // race condition where multiple threads calling preGetter concurrently
       return;
     }
 
     if (lazyLoadFailure) {
       // failed when batch lazy loaded by another bean in the batch
-      throw new EntityNotFoundException("Lazy loading failed on type:" + owner.getClass().getName() + " id:" + ownerId + " - Bean has been deleted");
+      throw new EntityNotFoundException("(Lazy) loading failed on type:" + owner.getClass().getName() + " id:" + ownerId + " - Bean has been deleted");
     }
 
     if (lazyLoadProperty == -1) {
@@ -887,7 +888,7 @@ public final class EntityBeanIntercept implements Serializable {
    * Called when a BeanCollection is initialised automatically.
    */
   public void initialisedMany(int propertyIndex) {
-    loadedProps[propertyIndex] = true;
+    flags[propertyIndex] |= FLAG_LOADED_PROP;
   }
 
   private void preGetterCallback(int propertyIndex) {

src/main/java/io/ebean/common/BeanMap.java

@@ -273,14 +273,16 @@ public final class BeanMap<K, E> extends AbstractBeanCollection<E> implements Ma
     checkReadOnly();
     init();
     if (modifyListening) {
-      Object oldBean = map.put(key, value);
+      E 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 oldBean;
+    } else {
+      return map.put(key, value);
     }
-    return map.put(key, value);
   }
 
   @Override
@@ -295,8 +297,9 @@ public final class BeanMap<K, E> extends AbstractBeanCollection<E> implements Ma
           modifyRemoval(oldBean);
         }
       }
+    } else {
+      map.putAll(puts);
     }
-    map.putAll(puts);
   }
 
   @Override

src/main/java/io/ebean/config/BeanNotEnhancedException.java

@@ -0,0 +1,15 @@
+package io.ebean.config;
+
+/**
+ * Throw when an processing an entity bean that is not bytecode enhanced.
+ *
+ * Refer: https://ebean.io/docs/trouble-shooting#not-enhanced
+ */
+public class BeanNotEnhancedException extends IllegalStateException {
+
+  private static final long serialVersionUID = 3008101919425876799L;
+
+  public BeanNotEnhancedException(String msg) {
+    super(msg);
+  }
+}

src/main/java/io/ebean/config/BeanNotRegisteredException.java

@@ -0,0 +1,15 @@
+package io.ebean.config;
+
+/**
+ * Throw when an processing thinks a bean is not registered.
+ *
+ * Refer: https://ebean.io/docs/trouble-shooting#not-registered
+ */
+public class BeanNotRegisteredException extends IllegalStateException {
+
+  private static final long serialVersionUID = -1411298126011136552L;
+
+  public BeanNotRegisteredException(String msg) {
+    super(msg);
+  }
+}

src/main/java/io/ebean/config/DbMigrationConfig.java

@@ -28,34 +28,6 @@ public class DbMigrationConfig {
    */
   protected Platform platform;
 
-  /**
-   * Set to true if the DB migration should be generated on server start.
-   */
-  protected boolean generate;
-
-  /**
-   * The migration version name (typically FlywayDb compatible).
-   * <p>
-   * Example: 1.1.1_2
-   * <p>
-   * The version is expected to be the combination of the current pom version plus
-   * a 'feature' id. The combined version must be unique and ordered to work with
-   * FlywayDb so each developer sets a unique version so that the migration script
-   * generated is unique (typically just prior to being submitted as a merge request).
-   */
-  protected String version;
-
-  /**
-   * Description text that can be appended to the version to become the ddl script file name.
-   * <p>
-   * So if the name is "a foo table" then the ddl script file could be:
-   * "1.1.1_2__a-foo-table.sql"
-   * <p>
-   * When the DB migration relates to a git feature (merge request) then this description text
-   * is a short description of the feature.
-   */
-  protected String name;
-
   /**
    * Resource path for the migration xml and sql.
    */
@@ -75,13 +47,6 @@ public class DbMigrationConfig {
 
   protected String modelSuffix = ".model.xml";
 
-  protected boolean includeGeneratedFileComment;
-
-  /**
-   * The version of a pending drop that should be generated as the next migration.
-   */
-  protected String generatePendingDrop;
-
   /**
    * For running migration the DB table that holds migration execution status.
    */
@@ -107,6 +72,11 @@ public class DbMigrationConfig {
    */
   protected String dbSchema;
 
+  /**
+   * Set to true if we consider this the 'default schema' (Postgres schema that matches DB username)
+   */
+  protected boolean defaultDbSchema;
+
   /**
    * DB user used to run the DB migration.
    */
@@ -223,52 +193,6 @@ public class DbMigrationConfig {
     this.applyPrefix = applyPrefix;
   }
 
-  /**
-   * Return true if the generated file comment should be included.
-   */
-  public boolean isIncludeGeneratedFileComment() {
-    return includeGeneratedFileComment;
-  }
-
-  /**
-   * Set to true if the generated file comment should be included.
-   */
-  public void setIncludeGeneratedFileComment(boolean includeGeneratedFileComment) {
-    this.includeGeneratedFileComment = includeGeneratedFileComment;
-  }
-
-  /**
-   * Return the migration version (or "next") to generate pending drops for.
-   */
-  public String getGeneratePendingDrop() {
-    return generatePendingDrop;
-  }
-
-  /**
-   * Set the migration version (or "next") to generate pending drops for.
-   */
-  public void setGeneratePendingDrop(String generatePendingDrop) {
-    this.generatePendingDrop = generatePendingDrop;
-  }
-
-  /**
-   * Set the migration version.
-   * <p>
-   * Note that version set via System property or environment variable <code>ddl.migration.version</code> takes precedence.
-   */
-  public void setVersion(String version) {
-    this.version = version;
-  }
-
-  /**
-   * Set the migration name.
-   * <p>
-   * Note that name set via System property or environment variable <code>ddl.migration.name</code> takes precedence.
-   */
-  public void setName(String name) {
-    this.name = name;
-  }
-
   /**
    * Return the table name that holds the migration run details
    * (used by DB Migration runner only).
@@ -400,9 +324,15 @@ public class DbMigrationConfig {
    * Set the Db schema if it hasn't already been defined.
    */
   public void setDefaultDbSchema(String dbSchema) {
-    if (this.dbSchema == null) {
-      this.dbSchema = dbSchema;
-    }
+    this.defaultDbSchema = true;
+    this.dbSchema = dbSchema;
+  }
+
+  /**
+   * Return true if this is considered the default DB schema (Postgres schema matching DB username).
+   */
+  public boolean isDefaultDbSchema() {
+    return defaultDbSchema;
   }
 
   /**
@@ -493,14 +423,8 @@ public class DbMigrationConfig {
     applyPrefix = properties.get("migration.applyPrefix", applyPrefix);
     applySuffix = properties.get("migration.applySuffix", applySuffix);
     modelSuffix = properties.get("migration.modelSuffix", modelSuffix);
-    includeGeneratedFileComment = properties.getBoolean("migration.includeGeneratedFileComment", includeGeneratedFileComment);
-    generatePendingDrop = properties.get("migration.generatePendingDrop", generatePendingDrop);
 
     platform = properties.getEnum(Platform.class, "migration.platform", platform);
-
-    generate = properties.getBoolean("migration.generate", generate);
-    version = properties.get("migration.version", version);
-    name = properties.get("migration.name", name);
     patchInsertOn = properties.get("migration.patchInsertOn", patchInsertOn);
     patchResetChecksumOn = properties.get("migration.patchResetChecksumOn", patchResetChecksumOn);
 
@@ -521,44 +445,6 @@ public class DbMigrationConfig {
     ddlHeader = properties.get("ddl.header", ddlHeader);
   }
 
-  /**
-   * Return the migration version (typically FlywayDb compatible).
-   * <p>
-   * Example: 1.1.1_2
-   * <p>
-   * The version is expected to be the combination of the current pom version plus
-   * a 'feature' id. The combined version must be unique and ordered to work with
-   * FlywayDb so each developer sets a unique version so that the migration script
-   * generated is unique (typically just prior to being submitted as a merge request).
-   */
-  public String getVersion() {
-    String envVersion = readEnvironment("ddl.migration.version");
-    if (!isEmpty(envVersion)) {
-      return envVersion.trim();
-    }
-    return version;
-  }
-
-  /**
-   * Return the migration name which is short description text that can be appended to
-   * the migration version to become the ddl script file name.
-   * <p>
-   * So if the name is "a foo table" then the ddl script file could be:
-   * "1.1.1_2__a-foo-table.sql"
-   * </p>
-   * <p>
-   * When the DB migration relates to a git feature (merge request) then this description text
-   * is a short description of the feature.
-   * </p>
-   */
-  public String getName() {
-    String envName = readEnvironment("ddl.migration.name");
-    if (!isEmpty(envName)) {
-      return envName.trim();
-    }
-    return name;
-  }
-
   /**
    * Return the system or environment property.
    */
@@ -591,6 +477,9 @@ public class DbMigrationConfig {
     runnerConfig.setDbUsername(getDbUsername());
     runnerConfig.setDbPassword(getDbPassword());
     runnerConfig.setDbSchema(getDbSchema());
+    if (defaultDbSchema) {
+      runnerConfig.setSetCurrentSchema(false);
+    }
     runnerConfig.setClassLoader(classLoader);
     if (patchInsertOn != null) {
       runnerConfig.setPatchInsertOn(patchInsertOn);

src/main/java/io/ebean/config/ServerConfig.java

@@ -30,7 +30,7 @@ import io.ebean.event.readaudit.ReadAuditPrepare;
 import io.ebean.meta.MetaInfoManager;
 import io.ebean.migration.MigrationRunner;
 import io.ebean.util.StringHelper;
-import org.avaje.datasource.DataSourceConfig;
+import io.ebean.datasource.DataSourceConfig;
 
 import javax.sql.DataSource;
 import java.time.Clock;
@@ -1965,6 +1965,15 @@ public class ServerConfig {
    * Return the UUID state file.
    */
   public String getUuidStateFile() {
+    if (uuidStateFile == null || uuidStateFile.isEmpty()) {
+      // by default, add servername...
+      uuidStateFile = name + "-uuid.state";
+      // and store it in the user's home directory
+      String homeDir = System.getProperty("user.home");
+      if (homeDir != null && homeDir.isEmpty()) {
+        uuidStateFile = homeDir + "/.ebean/" + uuidStateFile;
+      }
+    }
     return uuidStateFile;
   }
 
@@ -3130,9 +3139,10 @@ public class ServerConfig {
    * @return A copy of the PlatformConfig with overridden properties
    */
   public PlatformConfig newPlatformConfig(String propertiesPath, String platformPrefix) {
-
+    if (properties == null) {
+      properties = new Properties();
+    }
     PropertiesWrapper p = new PropertiesWrapper(propertiesPath, platformPrefix, properties, classLoadConfig);
-
     PlatformConfig config = new PlatformConfig(platformConfig);
     config.loadSettings(p);
     return config;

src/main/java/io/ebean/config/dbplatform/DatabasePlatform.java

@@ -2,6 +2,7 @@ package io.ebean.config.dbplatform;
 
 import io.ebean.BackgroundExecutor;
 import io.ebean.Query;
+import io.ebean.annotation.PartitionMode;
 import io.ebean.annotation.PersistBatch;
 import io.ebean.annotation.Platform;
 import io.ebean.config.CustomDbTypeMapping;
@@ -51,7 +52,7 @@ public class DatabasePlatform {
   /**
    * The behaviour used when ending a read only transaction at read committed isolation level.
    */
-  protected OnQueryOnly onQueryOnly = OnQueryOnly.ROLLBACK;
+  protected OnQueryOnly onQueryOnly = OnQueryOnly.COMMIT;
 
   /**
    * The open quote used by quoted identifiers.
@@ -63,8 +64,6 @@ public class DatabasePlatform {
    */
   protected String closeQuote = "\"";
 
-  protected String concatOperator = "||";
-
   /**
    * When set to true all db column names and table names use quoted identifiers.
    */
@@ -177,9 +176,17 @@ public class DatabasePlatform {
    * findIterate() and findVisit().
    */
   protected boolean forwardOnlyHintOnFindIterate;
+  
+  /**
+   * If set then use the CONCUR_UPDATABLE hint when creating ResultSets.
+   * 
+   * This is {@code false} for HANA
+   */
+  protected boolean supportsResultSetConcurrencyModeUpdatable = true;
+
 
   /**
-   * By default we use JDBC batch when cascading (except for SQL Server).
+   * By default we use JDBC batch when cascading (except for SQL Server and HANA).
    */
   protected PersistBatch persistBatchOnCascade = PersistBatch.ALL;
 
@@ -454,13 +461,6 @@ public class DatabasePlatform {
     return openQuote;
   }
 
-  /**
-   * Return the DB concat operator.
-   */
-  public String getConcatOperator() {
-    return concatOperator;
-  }
-
   /**
    * Return the JDBC type used to store booleans.
    */
@@ -524,6 +524,24 @@ public class DatabasePlatform {
   public void setForwardOnlyHintOnFindIterate(boolean forwardOnlyHintOnFindIterate) {
     this.forwardOnlyHintOnFindIterate = forwardOnlyHintOnFindIterate;
   }
+  
+  /**
+   * Return true if the ResultSet CONCUR_UPDATABLE Hint should be used on
+   * createNativeSqlTree() PreparedStatements.
+   * <p>
+   * This specifically is required for Hana which doesn't support CONCUR_UPDATABLE
+   * </p>
+   */
+  public boolean isSupportsResultSetConcurrencyModeUpdatable() {
+    return supportsResultSetConcurrencyModeUpdatable;
+  }
+  
+  /**
+   * Set to true if the ResultSet CONCUR_UPDATABLE Hint should be used by default on createNativeSqlTree() PreparedStatements.
+   */
+  public void setSupportsResultSetConcurrencyModeUpdatable(boolean supportsResultSetConcurrencyModeUpdatable) {
+    this.supportsResultSetConcurrencyModeUpdatable = supportsResultSetConcurrencyModeUpdatable;
+  }
 
   /**
    * Normally not needed - overridden in CockroachPlatform.
@@ -706,6 +724,20 @@ public class DatabasePlatform {
     }
   }
 
+  /**
+   * Return true if partitions exist for the given table.
+   */
+  public boolean tablePartitionsExist(Connection connection, String table) throws SQLException {
+    return true;
+  }
+
+  /**
+   * Return the SQL to create an initial partition for the given table.
+   */
+  public String tablePartitionInit(String tableName, PartitionMode mode, String property, String singlePrimaryKey) {
+    return null;
+  }
+
   /**
    * Escapes the like string for this DB-Platform
    */

src/main/java/io/ebean/config/dbplatform/DbIdentity.java

@@ -8,7 +8,9 @@ import java.util.regex.Pattern;
  */
 public class DbIdentity {
 
-  private static final Pattern TABLE_REPLACE = Pattern.compile("{table}", Pattern.LITERAL);
+  private static final String TABLE_PLACEHOLDER = "{table}";
+
+  private static final Pattern TABLE_REPLACE = Pattern.compile(TABLE_PLACEHOLDER, Pattern.LITERAL);
 
   /**
    * Set if this DB supports sequences. Note some DB's support both Sequences
@@ -53,7 +55,9 @@ public class DbIdentity {
     if (selectLastInsertedIdTemplate == null) {
       return null;
     }
-
+    if (!selectLastInsertedIdTemplate.contains(TABLE_PLACEHOLDER)) {
+      return selectLastInsertedIdTemplate;
+    }
     return TABLE_REPLACE.matcher(selectLastInsertedIdTemplate).replaceAll(Matcher.quoteReplacement(table));
   }
 

src/main/java/io/ebean/config/dbplatform/hana/HanaBasicSqlLimiter.java

@@ -0,0 +1,24 @@
+package io.ebean.config.dbplatform.hana;
+
+import io.ebean.config.dbplatform.BasicSqlLimiter;
+
+public class HanaBasicSqlLimiter implements BasicSqlLimiter {
+  @Override
+  public String limit(String dbSql, int firstRow, int maxRows) {
+    StringBuilder sb = new StringBuilder(50 + dbSql.length());
+
+    sb.append(dbSql);
+
+    if (maxRows > 0) {
+      sb.append(" ").append("limit");
+      sb.append(" ").append(maxRows);
+
+      if (firstRow > 0) {
+        sb.append(" ").append("offset").append(" ");
+        sb.append(firstRow);
+      }
+    }
+
+    return sb.toString();
+  }
+}

src/main/java/io/ebean/config/dbplatform/hana/HanaHistorySupport.java

@@ -0,0 +1,27 @@
+package io.ebean.config.dbplatform.hana;
+
+import io.ebean.config.dbplatform.DbStandardHistorySupport;
+
+public class HanaHistorySupport extends DbStandardHistorySupport {
+
+  @Override
+  public String getAsOfViewSuffix(String asOfViewSuffix) {
+    return " for system_time as of ?";
+  }
+
+  @Override
+  public String getVersionsBetweenSuffix(String asOfViewSuffix) {
+    return " for system_time between ? and ?";
+  }
+
+  @Override
+  public String getSysPeriodLower(String tableAlias, String sysPeriod) {
+    return tableAlias + "." + sysPeriod + "_start";
+  }
+
+  @Override
+  public String getSysPeriodUpper(String tableAlias, String sysPeriod) {
+    return tableAlias + "." + sysPeriod + "_end";
+  }
+  
+}

src/main/java/io/ebean/config/dbplatform/hana/HanaPlatform.java

@@ -0,0 +1,96 @@
+package io.ebean.config.dbplatform.hana;
+
+import io.ebean.Query.ForUpdate;
+import io.ebean.annotation.PersistBatch;
+import io.ebean.annotation.Platform;
+import io.ebean.config.PlatformConfig;
+import io.ebean.config.dbplatform.DatabasePlatform;
+import io.ebean.config.dbplatform.DbPlatformType;
+import io.ebean.config.dbplatform.DbType;
+import io.ebean.config.dbplatform.IdType;
+import io.ebean.config.dbplatform.SqlErrorCodes;
+
+public class HanaPlatform extends DatabasePlatform {
+
+  public HanaPlatform() {
+    this.platform = Platform.HANA;
+    this.sqlLimiter = new HanaSqlLimiter();
+    this.persistBatchOnCascade = PersistBatch.NONE;
+    this.supportsResultSetConcurrencyModeUpdatable = false;
+    this.columnAliasPrefix = null;
+
+    this.historySupport = new HanaHistorySupport();
+    this.basicSqlLimiter = new HanaBasicSqlLimiter();
+
+    this.likeClauseRaw = "like ?";
+    this.maxConstraintNameLength = 127;
+    this.maxTableNameLength = 127;
+
+    this.dbDefaultValue.setNow("current_timestamp");
+
+    this.exceptionTranslator = new SqlErrorCodes().addAcquireLock("131", "133", "146")
+      .addDataIntegrity("130", "429", "461", "462").addDuplicateKey("144", "301", "349").build();
+
+    this.dbIdentity.setIdType(IdType.IDENTITY);
+    this.dbIdentity.setSelectLastInsertedIdTemplate("select current_identity_value() from sys.dummy");
+    this.dbIdentity.setSupportsGetGeneratedKeys(false);
+    this.dbIdentity.setSupportsIdentity(true);
+
+    this.dbTypeMap.put(DbType.BIGINT, new DbPlatformType("bigint", false));
+    this.dbTypeMap.put(DbType.BINARY, new DbPlatformType("varbinary", 255));
+    this.dbTypeMap.put(DbType.BIT, new DbPlatformType("smallint", false));
+    this.dbTypeMap.put(DbType.BLOB, new DbPlatformType("blob", false));
+    this.dbTypeMap.put(DbType.CHAR, new DbPlatformType("nvarchar", 255));
+    this.dbTypeMap.put(DbType.CLOB, new DbPlatformType("nclob", false));
+    this.dbTypeMap.put(DbType.INTEGER, new DbPlatformType("integer", false));
+    this.dbTypeMap.put(DbType.JSONVARCHAR, new DbPlatformType("nvarchar", 255));
+    this.dbTypeMap.put(DbType.LINESTRING, new DbPlatformType("st_geometry"));
+    this.dbTypeMap.put(DbType.LONGVARBINARY, new DbPlatformType("blob", false));
+    this.dbTypeMap.put(DbType.LONGVARCHAR, new DbPlatformType("nclob", false));
+    this.dbTypeMap.put(DbType.MULTILINESTRING, new DbPlatformType("st_geometry"));
+    this.dbTypeMap.put(DbType.MULTIPOINT, new DbPlatformType("st_geometry"));
+    this.dbTypeMap.put(DbType.MULTIPOLYGON, new DbPlatformType("st_geometry"));
+    this.dbTypeMap.put(DbType.POINT, new DbPlatformType("st_point"));
+    this.dbTypeMap.put(DbType.POLYGON, new DbPlatformType("st_geometry"));
+    this.dbTypeMap.put(DbType.SMALLINT, new DbPlatformType("smallint", false));
+    this.dbTypeMap.put(DbType.TINYINT, new DbPlatformType("smallint", false));
+    this.dbTypeMap.put(DbType.UUID, new DbPlatformType("varchar", 40));
+    this.dbTypeMap.put(DbType.VARBINARY, new DbPlatformType("varbinary", 255));
+    this.dbTypeMap.put(DbType.VARCHAR, new DbPlatformType("nvarchar", 255));
+  }
+
+  @Override
+  protected void addGeoTypes(int srid) {
+    this.dbTypeMap.put(DbType.LINESTRING, new DbPlatformType("st_geometry(" + srid + ")", false));
+    this.dbTypeMap.put(DbType.MULTILINESTRING, new DbPlatformType("st_geometry(" + srid + ")", false));
+    this.dbTypeMap.put(DbType.MULTIPOINT, new DbPlatformType("st_geometry(" + srid + ")", false));
+    this.dbTypeMap.put(DbType.MULTIPOLYGON, new DbPlatformType("st_geometry(" + srid + ")", false));
+    this.dbTypeMap.put(DbType.POINT, new DbPlatformType("st_point(" + srid + ")", false));
+    this.dbTypeMap.put(DbType.POLYGON, new DbPlatformType("st_geometry(" + srid + ")", false));
+  }
+
+  @Override
+  protected String withForUpdate(String sql, ForUpdate forUpdateMode) {
+    switch (forUpdateMode) {
+      case BASE:
+        return sql + " for update";
+      case NOWAIT:
+        return sql + " for update nowait";
+      case SKIPLOCKED:
+        return sql + " for update ignore locked";
+      default:
+        throw new IllegalArgumentException("Unknown update mode: " + forUpdateMode.name());
+    }
+  }
+
+  @Override
+  protected void configure(PlatformConfig config, boolean allQuotedIdentifiers) {
+    super.configure(config, allQuotedIdentifiers);
+    if (config.getDbUuid().useBinary()) {
+      this.dbTypeMap.put(DbType.UUID, new DbPlatformType("varbinary", 16));
+    } else {
+      this.dbTypeMap.put(DbType.UUID, new DbPlatformType("varchar", 40));
+    }
+  }
+
+}

src/main/java/io/ebean/config/dbplatform/hana/HanaSqlLimiter.java

@@ -0,0 +1,35 @@
+package io.ebean.config.dbplatform.hana;
+
+import io.ebean.config.dbplatform.SqlLimitRequest;
+import io.ebean.config.dbplatform.SqlLimitResponse;
+import io.ebean.config.dbplatform.SqlLimiter;
+
+public class HanaSqlLimiter implements SqlLimiter {
+  @Override
+  public SqlLimitResponse limit(SqlLimitRequest request) {
+    String dbSql = request.getDbSql();
+
+    StringBuilder sb = new StringBuilder(50 + dbSql.length());
+    sb.append("select ");
+    if (request.isDistinct()) {
+      sb.append("distinct ");
+    }
+
+    sb.append(dbSql);
+
+    int firstRow = request.getFirstRow();
+    int maxRows = request.getMaxRows();
+
+    if (maxRows > 0) {
+      sb.append(" ").append("limit ").append(maxRows);
+      if (firstRow > 0) {
+        sb.append(" ").append("offset ");
+        sb.append(firstRow);
+      }
+    }
+
+    String sql = request.getDbPlatform().completeSql(sb.toString(), request.getOrmQuery());
+
+    return new SqlLimitResponse(sql, false);
+  }
+}

src/main/java/io/ebean/config/dbplatform/hana/package-info.java

@@ -0,0 +1,4 @@
+/**
+ * SAP HANA specific support.
+ */
+package io.ebean.config.dbplatform.hana;

src/main/java/io/ebean/config/dbplatform/postgres/PostgresPlatform.java

@@ -2,6 +2,7 @@ package io.ebean.config.dbplatform.postgres;
 
 import io.ebean.BackgroundExecutor;
 import io.ebean.Query;
+import io.ebean.annotation.PartitionMode;
 import io.ebean.annotation.Platform;
 import io.ebean.config.dbplatform.DatabasePlatform;
 import io.ebean.config.dbplatform.DbPlatformType;
@@ -11,6 +12,10 @@ import io.ebean.config.dbplatform.PlatformIdGenerator;
 import io.ebean.config.dbplatform.SqlErrorCodes;
 
 import javax.sql.DataSource;
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
 import java.sql.Types;
 
 /**
@@ -116,4 +121,32 @@ public class PostgresPlatform extends DatabasePlatform {
         return sql + " for update";
     }
   }
+
+  @Override
+  public boolean tablePartitionsExist(Connection connection, String table) throws SQLException {
+
+    try (PreparedStatement statement = connection.prepareStatement("select count(*) from pg_inherits i WHERE  i.inhparent = ?::regclass")) {
+      statement.setString(1, table);
+      try (ResultSet resultSet = statement.executeQuery()) {
+        return resultSet.next() && resultSet.getInt(1) > 0;
+      }
+    }
+  }
+
+  /**
+   * Return SQL using built in partition helper functions to create some initial partitions.
+   *
+   * Only use this if extra-ddl doesn't have some initial partitions defined (which it should).
+   */
+  @Override
+  public String tablePartitionInit(String tableName, PartitionMode mode, String property, String pkey) {
+    if (property == null) {
+      property = "";
+    }
+    if (pkey == null) {
+      pkey = "";
+    }
+    return "select partition('" + mode.name().toLowerCase() + "','" + tableName + "','" + pkey + "','" + property + "',1);";
+  }
+
 }

src/main/java/io/ebean/dbmigration/DbMigration.java

@@ -7,6 +7,7 @@ import io.ebean.config.dbplatform.DatabasePlatform;
 
 import java.io.IOException;
 import java.util.Iterator;
+import java.util.List;
 import java.util.ServiceLoader;
 
 /**
@@ -98,6 +99,11 @@ public interface DbMigration {
    */
   void setIncludeGeneratedFileComment(boolean includeGeneratedFileComment);
 
+  /**
+   * Set this to false to exclude the builtin support for table partitioning (with @DbPartition).
+   */
+  void setIncludeBuiltInPartitioning(boolean includeBuiltInPartitioning);
+
   /**
    * Set the header that is included in the generated DDL script.
    */
@@ -142,6 +148,11 @@ public interface DbMigration {
    */
   void addDatabasePlatform(DatabasePlatform databasePlatform, String prefix);
 
+  /**
+   * Return the list of versions that contain pending drops.
+   */
+  List<String> getPendingDrops();
+
   /**
    * Generate the next migration xml file and associated apply and rollback sql scripts.
    * <p>

src/main/java/io/ebean/plugin/BeanType.java

@@ -9,6 +9,10 @@ import io.ebean.event.BeanQueryAdapter;
 import io.ebeanservice.docstore.api.mapping.DocumentMapping;
 
 import java.util.Collection;
+import java.util.List;
+import java.util.function.Consumer;
+
+import javax.annotation.Nonnull;
 
 /**
  * Information and methods on BeanDescriptors made available to plugins.
@@ -18,6 +22,7 @@ public interface BeanType<T> {
   /**
    * Return the short name of the bean type.
    */
+  @Nonnull
   String getName();
 
   /**
@@ -28,11 +33,13 @@ public interface BeanType<T> {
   /**
    * Return the full name of the bean type.
    */
+  @Nonnull
   String getFullName();
 
   /**
    * Return the class type this BeanDescriptor describes.
    */
+  @Nonnull
   Class<T> getBeanType();
 
   /**
@@ -43,6 +50,7 @@ public interface BeanType<T> {
   /**
    * Return all the properties for this bean type.
    */
+  @Nonnull
   Collection<? extends Property> allProperties();
 
   /**
@@ -197,6 +205,28 @@ public interface BeanType<T> {
    */
   boolean hasInheritance();
 
+  /**
+   * Return true if this object is the root level object in its entity
+   * inheritance.
+   */
+  boolean isInheritanceRoot();
+
+  /**
+   * Returns all direct children of this beantype
+   */
+  List<BeanType<?>> getInheritanceChildren();
+
+  /**
+   * Returns the parent in inheritance hiearchy
+   */
+  BeanType<?> getInheritanceParent();
+
+  /**
+   * Visit all children recursively
+   * @param visitor
+   */
+  void visitAllInheritanceChildren(Consumer<BeanType<?>> visitor);
+
   /**
    * Return the discriminator column.
    */

src/main/java/io/ebean/plugin/Property.java

@@ -1,5 +1,7 @@
 package io.ebean.plugin;
 
+import javax.annotation.Nonnull;
+
 /**
  * Property of a entity bean that can be read.
  */
@@ -8,8 +10,15 @@ public interface Property {
   /**
    * Return the name of the property.
    */
+  @Nonnull
   String getName();
 
+  /**
+   * Return the type of the property.
+   */
+  @Nonnull
+  Class<?> getPropertyType();
+
   /**
    * Return the value of the property on the given bean.
    */

src/main/java/io/ebean/service/SpiFetchGroupService.java

@@ -0,0 +1,26 @@
+package io.ebean.service;
+
+import io.ebean.FetchGroup;
+import io.ebean.FetchGroupBuilder;
+
+/**
+ * Service that parses FetchGroup expressions.
+ */
+public interface SpiFetchGroupService {
+
+  /**
+   * Return the FetchGroup with the given select clause.
+   *
+   * @param beanType The type of entity bean the fetch group is for
+   * @param select   The properties to select (top level properties)
+   */
+  <T> FetchGroup<T> of(Class<T> beanType, String select);
+
+  /**
+   * Create and return a FetchGroupBuilder starting with a select() clause.
+   *
+   * @param beanType The type of entity bean the fetch group is for
+   * @return The FetchGroupBuilder to add additional select and fetch clauses
+   */
+  <T> FetchGroupBuilder<T> of(Class<T> beanType);
+}

src/main/java/io/ebeaninternal/api/LoadBeanRequest.java

@@ -168,13 +168,8 @@ public class LoadBeanRequest extends LoadRequest {
         // necessary but allow processing to continue until it is accessed by client code
         Object id = desc.getId(ebi.getOwner());
         if (!loadedIds.contains(id)) {
-          if (desc.isSoftDelete()) {
-            // assume this is logically deleted (hence not found)
-            desc.setSoftDeleteValue(ebi.getOwner());
-          } else {
-            logger.info("Lazy loading unsuccessful for type:" + desc.getName() + " id:" + id + " - expecting when bean has been deleted");
-            ebi.setLazyLoadFailure(id);
-          }
+          // assume this is logically deleted (hence not found)
+          desc.markAsDeleted(ebi.getOwner());
         }
       }
     }

src/main/java/io/ebeaninternal/api/NaturalKeyQueryData.java

@@ -25,7 +25,7 @@ public class NaturalKeyQueryData<T> {
   private List<Pairs.Entry> inPairs;
 
   // IN clause - only one allowed
-  private Collection<?> inValues;
+  private List<Object> inValues;
   private String inProperty;
 
   // normal EQ expressions
@@ -52,36 +52,36 @@ public class NaturalKeyQueryData<T> {
   /**
    * Match for In Pairs expression. We only allow one IN clause.
    */
-  public boolean matchInPairs(Pairs pairs) {
+  public List<Pairs.Entry> matchInPairs(String property0, String property1, List<Pairs.Entry> inPairs) {
     if (hasIn) {
       // only 1 IN allowed (to project naturalIds)
-      return false;
+      return null;
     }
-    if (matchProperty(pairs.getProperty0()) && matchProperty(pairs.getProperty1())) {
+    if (matchProperty(property0) && matchProperty(property1)) {
       this.hasIn = true;
-      this.inProperty0 = pairs.getProperty0();
-      this.inProperty1 = pairs.getProperty1();
-      this.inPairs = pairs.getEntries();
-      return true;
+      this.inProperty0 = property0;
+      this.inProperty1 = property1;
+      this.inPairs = new ArrayList<>(inPairs); // will be modified
+      return this.inPairs;
     }
-    return false;
+    return null;
   }
 
   /**
    * Match for IN expression. We only allow one IN clause.
    */
-  public boolean matchIn(String propName, Collection<?> sourceValues) {
+  public List<Object> matchIn(String propName, List<Object> sourceValues) {
     if (hasIn) {
       // only 1 IN allowed (to project naturalIds)
-      return false;
+      return null;
     }
     if (matchProperty(propName)) {
       this.hasIn = true;
       this.inProperty = propName;
-      this.inValues = sourceValues;
-      return true;
+      this.inValues = new ArrayList<>(sourceValues);
+      return this.inValues;
     }
-    return false;
+    return null;
   }
 
   /**

src/main/java/io/ebeaninternal/api/SpiDtoQuery.java

@@ -37,6 +37,7 @@ public interface SpiDtoQuery<T> extends DtoQuery<T>, SpiSqlBinding {
   /**
    * Return the label for the query.
    */
+  @Override
   String getLabel();
 
   /**

src/main/java/io/ebeaninternal/api/SpiEbeanServer.java

@@ -312,4 +312,8 @@ public interface SpiEbeanServer extends ExtendedServer, EbeanServer, BeanLoader,
    */
   int[] executeBatch(SpiSqlUpdate defaultSqlUpdate, SpiTransaction transaction);
 
+  /**
+   * Execute the sql update regardless of transaction batch mode.
+   */
+  int executeNow(SpiSqlUpdate sqlUpdate);
 }

src/main/java/io/ebeaninternal/api/SpiQuery.java

@@ -134,27 +134,40 @@ public interface SpiQuery<T> extends Query<T>, TxnProfileEventCodes {
     /**
      * Includes soft deletes rows in the result.
      */
-    SOFT_DELETED,
+    SOFT_DELETED(false),
 
     /**
      * Query runs against draft tables.
      */
-    DRAFT,
+    DRAFT(false),
 
     /**
      * Query runs against current data (normal).
      */
-    CURRENT,
+    CURRENT(false),
 
     /**
      * Query runs potentially returning many versions of the same bean.
      */
-    VERSIONS,
+    VERSIONS(true),
 
     /**
      * Query runs 'As Of' a given date time.
      */
-    AS_OF;
+    AS_OF(true);
+
+    private final boolean history;
+
+    TemporalMode(boolean history) {
+      this.history = history;
+    }
+
+    /**
+     * Return true if this is a history query.
+     */
+    public boolean isHistory() {
+      return history;
+    }
 
     /**
      * Return the mode of the query of if null return CURRENT mode.

src/main/java/io/ebeaninternal/api/SpiTransaction.java

@@ -7,7 +7,6 @@ import io.ebean.bean.PersistenceContext;
 import io.ebean.event.changelog.BeanChange;
 import io.ebean.event.changelog.ChangeSet;
 import io.ebeaninternal.server.core.PersistDeferredRelationship;
-import io.ebeaninternal.server.core.PersistRequest;
 import io.ebeaninternal.server.core.PersistRequestBean;
 import io.ebeaninternal.server.persist.BatchControl;
 import io.ebeaninternal.server.transaction.ProfileStream;

src/main/java/io/ebeaninternal/api/SpiTransactionProxy.java

@@ -8,7 +8,6 @@ import io.ebean.bean.PersistenceContext;
 import io.ebean.event.changelog.BeanChange;
 import io.ebean.event.changelog.ChangeSet;
 import io.ebeaninternal.server.core.PersistDeferredRelationship;
-import io.ebeaninternal.server.core.PersistRequest;
 import io.ebeaninternal.server.core.PersistRequestBean;
 import io.ebeaninternal.server.persist.BatchControl;
 import io.ebeaninternal.server.transaction.ProfileStream;

src/main/java/io/ebeaninternal/api/TransactionEvent.java

@@ -9,6 +9,7 @@ import io.ebeaninternal.server.transaction.TransactionManager;
 import io.ebeanservice.docstore.api.DocStoreUpdates;
 
 import java.io.Serializable;
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -29,16 +30,21 @@ public class TransactionEvent implements Serializable {
    */
   private final transient boolean local;
 
+  private final long startMillis;
+
   private TransactionEventTable eventTables;
 
-  private transient TransactionEventBeans eventBeans;
+  private transient List<PersistRequestBean<?>> listenerNotify;
 
   private transient DeleteByIdMap deleteByIdMap;
 
+  private transient CacheChangeSet changeSet;
+
   /**
    * Create the TransactionEvent, one per Transaction.
    */
-  public TransactionEvent() {
+  public TransactionEvent(long startMillis) {
+    this.startMillis = startMillis;
     this.local = true;
   }
 
@@ -71,8 +77,8 @@ public class TransactionEvent implements Serializable {
   /**
    * Return the list of PersistRequestBean's for this transaction.
    */
-  public List<PersistRequestBean<?>> getPersistRequestBeans() {
-    return (eventBeans == null) ? null : eventBeans.getRequests();
+  public List<PersistRequestBean<?>> getListenerNotify() {
+    return (listenerNotify == null) ? null : listenerNotify;
   }
 
   public TransactionEventTable getEventTables() {
@@ -94,17 +100,13 @@ public class TransactionEvent implements Serializable {
   }
 
   /**
-   * Add a inserted updated or deleted bean to the event.
+   * Add post commit listeners. Watch this for large transactions.
    */
-  public void add(PersistRequestBean<?> request) {
-
-    if (request.isNotify()) {
-      // either a BeanListener or Cache is interested
-      if (eventBeans == null) {
-        eventBeans = new TransactionEventBeans();
-      }
-      eventBeans.add(request);
+  public void addListenerNotify(PersistRequestBean<?> request) {
+    if (listenerNotify == null) {
+      listenerNotify = new ArrayList<>();
     }
+    listenerNotify.add(request);
   }
 
   /**
@@ -112,11 +114,13 @@ public class TransactionEvent implements Serializable {
    */
   public CacheChangeSet buildCacheChanges(TransactionManager manager) {
 
-    if (eventBeans == null && deleteByIdMap == null && eventTables == null) {
+    if (changeSet == null && deleteByIdMap == null && eventTables == null) {
       return null;
     }
 
-    CacheChangeSet changeSet = new CacheChangeSet(manager.clockNowMillis());
+    if (changeSet == null) {
+      changeSet = new CacheChangeSet(manager.clockNowMillis());
+    }
     if (eventTables != null && !eventTables.isEmpty()) {
       // notify cache with table based changes
       BeanDescriptorManager dm = manager.getBeanDescriptorManager();
@@ -124,9 +128,6 @@ public class TransactionEvent implements Serializable {
         dm.cacheNotify(tableIUD, changeSet);
       }
     }
-    if (eventBeans != null) {
-      eventBeans.notifyCache(changeSet);
-    }
     if (deleteByIdMap != null) {
       deleteByIdMap.notifyCache(changeSet);
     }
@@ -137,12 +138,25 @@ public class TransactionEvent implements Serializable {
    * Add any relevant PersistRequestBean's to DocStoreUpdates for later processing.
    */
   public void addDocStoreUpdates(DocStoreUpdates docStoreUpdates) {
-
-    List<PersistRequestBean<?>> persistRequestBeans = getPersistRequestBeans();
-    if (persistRequestBeans != null) {
-      for (PersistRequestBean<?> persistRequestBean : persistRequestBeans) {
+    List<PersistRequestBean<?>> requests = getListenerNotify();
+    if (requests != null) {
+      for (PersistRequestBean<?> persistRequestBean : requests) {
         persistRequestBean.addDocStoreUpdates(docStoreUpdates);
       }
     }
   }
+
+  /**
+   * Return the CacheChangeSet that we add cache notification messages to.
+   *
+   * We want to add to this change set as we process requests allowing the
+   * PersistRequestBean to be garbage collected for large transactions.
+   */
+  public CacheChangeSet obtainCacheChangeSet() {
+    if (changeSet == null) {
+      changeSet = new CacheChangeSet(startMillis);
+    }
+    return changeSet;
+  }
+
 }

src/main/java/io/ebeaninternal/api/TransactionEventBeans.java

@@ -1,44 +0,0 @@
-package io.ebeaninternal.api;
-
-import io.ebeaninternal.server.cache.CacheChangeSet;
-import io.ebeaninternal.server.core.PersistRequestBean;
-
-import java.util.ArrayList;
-import java.util.List;
-
-/**
- * Lists of inserted updated and deleted beans that have a BeanPersistListener.
- * <p>
- * These beans will be sent to the appropriate BeanListeners after a successful
- * commit of the transaction.
- * </p>
- */
-public class TransactionEventBeans {
-
-  final ArrayList<PersistRequestBean<?>> requests = new ArrayList<>();
-
-  /**
-   * Return the list of PersistRequests that BeanListeners are interested in.
-   */
-  public List<PersistRequestBean<?>> getRequests() {
-    return requests;
-  }
-
-  /**
-   * Add a bean for BeanListener notification.
-   */
-  public void add(PersistRequestBean<?> request) {
-
-    requests.add(request);
-  }
-
-  /**
-   * Collect the cache changes.
-   */
-  public void notifyCache(CacheChangeSet changeSet) {
-    for (PersistRequestBean<?> request : requests) {
-      request.notifyCache(changeSet);
-    }
-  }
-
-}

src/main/java/io/ebeaninternal/dbmigration/DdlGenerator.java

@@ -1,11 +1,16 @@
 package io.ebeaninternal.dbmigration;
 
+import io.ebean.config.DbMigrationConfig;
 import io.ebean.config.ServerConfig;
+import io.ebean.config.dbplatform.DatabasePlatform;
 import io.ebean.migration.ddl.DdlRunner;
+import io.ebean.migration.runner.ScriptTransform;
 import io.ebean.util.JdbcClose;
 import io.ebeaninternal.api.SpiEbeanServer;
 import io.ebeaninternal.dbmigration.model.CurrentModel;
+import io.ebeaninternal.dbmigration.model.MTable;
 import io.ebeaninternal.extraddl.model.ExtraDdlXmlReader;
+import io.ebeaninternal.server.deploy.PartitionMeta;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -39,6 +44,7 @@ public class DdlGenerator {
   private final boolean jaxbPresent;
   private final boolean ddlCommitOnCreateIndex;
   private final String dbSchema;
+  private final ScriptTransform scriptTransform;
 
   private CurrentModel currentModel;
   private String dropAllContent;
@@ -58,6 +64,7 @@ public class DdlGenerator {
       this.runDdl = serverConfig.isDdlRun();
       this.ddlCommitOnCreateIndex = server.getDatabasePlatform().isDdlCommitOnCreateIndex();
     }
+    this.scriptTransform = createScriptTransform(serverConfig.getMigrationConfig());
   }
 
   /**
@@ -123,7 +130,9 @@ public class DdlGenerator {
 
   private void createSchemaIfRequired(Connection connection) {
     try {
-      server.getDatabasePlatform().createSchemaIfNotExists(dbSchema, connection);
+      for (String schema : dbSchema.split(",")) {
+        server.getDatabasePlatform().createSchemaIfNotExists(schema, connection);
+      }
     } catch (SQLException e) {
       throw new PersistenceException("Failed to create DB Schema", e);
     }
@@ -141,7 +150,7 @@ public class DdlGenerator {
       } else if (ddlCommitOnCreateIndex) {
         runner.setCommitOnCreateIndex();
       }
-      int count = runner.runAll(content, connection);
+      int count = runner.runAll(scriptTransform.transform(content), connection);
       if (expectErrors) {
         connection.setAutoCommit(false);
       }
@@ -161,7 +170,7 @@ public class DdlGenerator {
       if (!"true".equalsIgnoreCase(ignoreExtraDdl) && jaxbPresent) {
         String extraApply = ExtraDdlXmlReader.buildExtra(server.getDatabasePlatform().getName(), true);
         if (extraApply != null) {
-          runScript(connection, false, extraApply, "extra-dll");
+          runScript(connection, false, extraApply, "extra-ddl");
         }
       }
 
@@ -180,10 +189,50 @@ public class DdlGenerator {
 
     String ignoreExtraDdl = System.getProperty("ebean.ignoreExtraDdl");
     if (!"true".equalsIgnoreCase(ignoreExtraDdl) && jaxbPresent) {
+      if (currentModel.isTablePartitioning()) {
+        String extraPartitioning = ExtraDdlXmlReader.buildPartitioning(server.getDatabasePlatform().getName());
+        if (extraPartitioning != null && !extraPartitioning.isEmpty()) {
+          runScript(connection, false, extraPartitioning, "builtin-partitioning-ddl");
+        }
+      }
+
       String extraApply = ExtraDdlXmlReader.buildExtra(server.getDatabasePlatform().getName(), false);
       if (extraApply != null) {
-        runScript(connection, false, extraApply, "extra-dll");
+        runScript(connection, false, extraApply, "extra-ddl");
       }
+
+      if (currentModel.isTablePartitioning()) {
+        checkInitialTablePartitions(connection);
+      }
+    }
+  }
+
+  /**
+   * Check if table partitions exist and if not create some. The expectation is that
+   * extra-ddl.xml should have some partition initialisation but this helps people get going.
+   */
+  private void checkInitialTablePartitions(Connection connection) {
+
+    DatabasePlatform databasePlatform = server.getDatabasePlatform();
+    try {
+      StringBuilder sb = new StringBuilder();
+      for (MTable table : currentModel.getPartitionedTables()) {
+        String tableName = table.getName();
+        if (!databasePlatform.tablePartitionsExist(connection, tableName)) {
+          log.info("No table partitions for table {}", tableName);
+          PartitionMeta meta = table.getPartitionMeta();
+          String initPart = databasePlatform.tablePartitionInit(tableName, meta.getMode(), meta.getProperty(), table.singlePrimaryKey());
+          sb.append(initPart).append("\n");
+        }
+      }
+
+      String initialPartitionSql = sb.toString();
+      if (!initialPartitionSql.isEmpty()) {
+        runScript(connection, false, initialPartitionSql, "initial table partitions");
+      }
+
+    } catch (SQLException e) {
+      log.error("Error checking initial table partitions", e);
     }
   }
 
@@ -303,4 +352,12 @@ public class DdlGenerator {
     }
   }
 
+  /**
+   * Create the ScriptTransform for placeholder key/value replacement.
+   */
+  private ScriptTransform createScriptTransform(DbMigrationConfig config) {
+
+    return ScriptTransform.build(config.getRunPlaceholders(), config.getRunPlaceholderMap());
+  }
+
 }

src/main/java/io/ebeaninternal/dbmigration/DefaultDbMigration.java

@@ -10,6 +10,7 @@ import io.ebean.config.ServerConfig;
 import io.ebean.config.dbplatform.DatabasePlatform;
 import io.ebean.config.dbplatform.db2.DB2Platform;
 import io.ebean.config.dbplatform.h2.H2Platform;
+import io.ebean.config.dbplatform.hana.HanaPlatform;
 import io.ebean.config.dbplatform.hsqldb.HsqldbPlatform;
 import io.ebean.config.dbplatform.mysql.MySqlPlatform;
 import io.ebean.config.dbplatform.oracle.OraclePlatform;
@@ -57,7 +58,7 @@ import java.util.List;
  *
  *       DbMigration migration = DbMigration.create();
  *       migration.setPathToResources("src/main/resources");
- *       migration.setPlatform(DbPlatformName.ORACLE);
+ *       migration.setPlatform(Platform.POSTGRES);
  *
  *       migration.generateMigration();
  *
@@ -65,7 +66,7 @@ import java.util.List;
  */
 public class DefaultDbMigration implements DbMigration {
 
-  protected static final Logger logger = LoggerFactory.getLogger(DefaultDbMigration.class);
+  protected static final Logger logger = LoggerFactory.getLogger("io.ebean.GenerateMigration");
 
   private static final String initialVersion = "1.0";
 
@@ -84,6 +85,8 @@ public class DefaultDbMigration implements DbMigration {
 
   protected DatabasePlatform databasePlatform;
 
+  private boolean vanillaPlatform;
+
   protected List<Pair> platforms = new ArrayList<>();
 
   protected ServerConfig serverConfig;
@@ -98,6 +101,8 @@ public class DefaultDbMigration implements DbMigration {
   protected String name;
   protected String generatePendingDrop;
 
+  protected boolean includeBuiltInPartitioning = true;
+
   /**
    * Create for offline migration generation.
    */
@@ -179,6 +184,11 @@ public class DefaultDbMigration implements DbMigration {
     this.includeGeneratedFileComment = includeGeneratedFileComment;
   }
 
+  @Override
+  public void setIncludeBuiltInPartitioning(boolean includeBuiltInPartitioning) {
+    this.includeBuiltInPartitioning = includeBuiltInPartitioning;
+  }
+
   @Override
   public void setHeader(String header) {
     this.header = header;
@@ -192,6 +202,7 @@ public class DefaultDbMigration implements DbMigration {
    */
   @Override
   public void setPlatform(Platform platform) {
+    vanillaPlatform = true;
     setPlatform(getPlatform(platform));
   }
 
@@ -255,6 +266,7 @@ public class DefaultDbMigration implements DbMigration {
    *       migration.generateMigration();
    *
    * }</pre>
+   *
    * @return the generated migration or null
    */
   @Override
@@ -276,7 +288,13 @@ public class DefaultDbMigration implements DbMigration {
     try {
       Request request = createRequest();
       if (platforms.isEmpty()) {
-        generateExtraDdl(request.migrationDir, databasePlatform);
+        generateExtraDdl(request.migrationDir, databasePlatform, request.isTablePartitioning());
+      } else {
+        for (Pair pair : platforms) {
+          PlatformDdlWriter platformWriter = createDdlWriter(pair.platform);
+          File subPath = platformWriter.subPath(request.migrationDir, pair.prefix);
+          generateExtraDdl(subPath, pair.platform, request.isTablePartitioning());
+        }
       }
 
       String pendingVersion = generatePendingDrop();
@@ -293,6 +311,24 @@ public class DefaultDbMigration implements DbMigration {
     }
   }
 
+  /**
+   * Return the versions containing pending drops.
+   */
+  @Override
+  public List<String> getPendingDrops() {
+    if (!online) {
+      DbOffline.setGenerateMigration();
+    }
+    setDefaults();
+    try {
+      return createRequest().getPendingDrops();
+    } finally {
+      if (!online) {
+        DbOffline.reset();
+      }
+    }
+  }
+
   /**
    * Load the configuration for each of the target platforms.
    */
@@ -306,21 +342,28 @@ public class DefaultDbMigration implements DbMigration {
   /**
    * Generate "repeatable" migration scripts.
    * <p>
-   * These take scrips from extra-dll.xml (typically views) and outputs "repeatable"
+   * These take scrips from extra-ddl.xml (typically views) and outputs "repeatable"
    * migration scripts (starting with "R__") to be run by FlywayDb or Ebean's own
    * migration runner.
    * </p>
    */
-  private void generateExtraDdl(File migrationDir, DatabasePlatform dbPlatform) throws IOException {
+  private void generateExtraDdl(File migrationDir, DatabasePlatform dbPlatform, boolean tablePartitioning) throws IOException {
 
     if (dbPlatform != null) {
-      ExtraDdl extraDdl = ExtraDdlXmlReader.read("/extra-ddl.xml");
-      if (extraDdl != null) {
-        List<DdlScript> ddlScript = extraDdl.getDdlScript();
-        for (DdlScript script : ddlScript) {
-          if (!script.isDrop() && ExtraDdlXmlReader.matchPlatform(dbPlatform.getName(), script.getPlatforms())) {
-            writeExtraDdl(migrationDir, script);
-          }
+      if (tablePartitioning && includeBuiltInPartitioning) {
+        generateExtraDdlFor(migrationDir, dbPlatform, ExtraDdlXmlReader.readBuiltinTablePartitioning());
+      }
+      generateExtraDdlFor(migrationDir, dbPlatform, ExtraDdlXmlReader.readBuiltin());
+      generateExtraDdlFor(migrationDir, dbPlatform, ExtraDdlXmlReader.read());
+    }
+  }
+
+  private void generateExtraDdlFor(File migrationDir, DatabasePlatform dbPlatform, ExtraDdl extraDdl) throws IOException {
+    if (extraDdl != null) {
+      List<DdlScript> ddlScript = extraDdl.getDdlScript();
+      for (DdlScript script : ddlScript) {
+        if (!script.isDrop() && ExtraDdlXmlReader.matchPlatform(dbPlatform.getName(), script.getPlatforms())) {
+          writeExtraDdl(migrationDir, script);
         }
       }
     }
@@ -331,7 +374,7 @@ public class DefaultDbMigration implements DbMigration {
    */
   private void writeExtraDdl(File migrationDir, DdlScript script) throws IOException {
 
-    String fullName = repeatableMigrationName(script.getName());
+    String fullName = repeatableMigrationName(script.isInit(), script.getName());
 
     logger.info("writing repeatable script {}", fullName);
 
@@ -342,8 +385,16 @@ public class DefaultDbMigration implements DbMigration {
     }
   }
 
-  private String repeatableMigrationName(String scriptName) {
-    return "R__" + scriptName.replace(' ', '_') + migrationConfig.getApplySuffix();
+  private String repeatableMigrationName(boolean init, String scriptName) {
+    StringBuilder sb = new StringBuilder();
+    if (init) {
+      sb.append("I__");
+    } else {
+      sb.append("R__");
+    }
+    sb.append(scriptName.replace(' ', '_'));
+    sb.append(migrationConfig.getApplySuffix());
+    return sb.toString();
   }
 
   /**
@@ -404,6 +455,10 @@ public class DefaultDbMigration implements DbMigration {
       this.current = currentModel.read();
     }
 
+    boolean isTablePartitioning() {
+      return current.isTablePartitioning();
+    }
+
     /**
      * Return the migration for the pending drops for a given version.
      */
@@ -465,7 +520,7 @@ public class DefaultDbMigration implements DbMigration {
     if (nextDrop != null) {
       return nextDrop;
     }
-    return migrationConfig.getGeneratePendingDrop();
+    return generatePendingDrop;
   }
 
   /**
@@ -475,14 +530,15 @@ public class DefaultDbMigration implements DbMigration {
    */
   private String getFullVersion(MigrationModel migrationModel, String dropsFor) {
 
-    String version = migrationConfig.getVersion();
+    String version = getVersion();
     if (version == null) {
       version = migrationModel.getNextVersion(initialVersion);
     }
 
     String fullVersion = migrationConfig.getApplyPrefix() + version;
-    if (migrationConfig.getName() != null) {
-      fullVersion += "__" + toUnderScore(migrationConfig.getName());
+    String name = getName();
+    if (name != null) {
+      fullVersion += "__" + toUnderScore(name);
 
     } else if (dropsFor != null) {
       fullVersion += "__" + toUnderScore("dropsFor_" + MigrationVersion.trim(dropsFor));
@@ -510,8 +566,6 @@ public class DefaultDbMigration implements DbMigration {
       PlatformDdlWriter platformWriter = createDdlWriter(pair.platform);
       File subPath = platformWriter.subPath(writePath, pair.prefix);
       platformWriter.processMigration(dbMigration, platformBuffer, subPath, fullVersion);
-
-      generateExtraDdl(subPath, pair.platform);
     }
   }
 
@@ -529,7 +583,7 @@ public class DefaultDbMigration implements DbMigration {
     if (file.exists()) {
       return false;
     }
-    String comment = migrationConfig.isIncludeGeneratedFileComment() ? GENERATED_COMMENT : null;
+    String comment = Boolean.TRUE.equals(includeGeneratedFileComment) ? GENERATED_COMMENT : null;
     MigrationXmlWriter xmlWriter = new MigrationXmlWriter(comment);
     xmlWriter.write(dbMigration, file);
     return true;
@@ -542,11 +596,10 @@ public class DefaultDbMigration implements DbMigration {
     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
+    if (vanillaPlatform || databasePlatform == null) {
+      // not explicitly set so use the platform of the server
       databasePlatform = server.getDatabasePlatform();
-      logger.debug("set platform to {}", databasePlatform.getName());
+      logger.trace("set platform to {}", databasePlatform.getName());
     }
     if (migrationConfig != null) {
       if (strictMode != null) {
@@ -558,21 +611,66 @@ public class DefaultDbMigration implements DbMigration {
       if (header != null) {
         migrationConfig.setDdlHeader(header);
       }
-      if (includeGeneratedFileComment != null) {
-        migrationConfig.setIncludeGeneratedFileComment(includeGeneratedFileComment);
-      }
-      if (version != null) {
-        migrationConfig.setVersion(version);
-      }
-      if (name != null) {
-        migrationConfig.setName(name);
-      }
-      if (generatePendingDrop != null) {
-        migrationConfig.setGeneratePendingDrop(generatePendingDrop);
-      }
     }
   }
 
+  /**
+   * Return the migration version (typically FlywayDb compatible).
+   * <p>
+   * Example: 1.1.1_2
+   * <p>
+   * The version is expected to be the combination of the current pom version plus
+   * a 'feature' id. The combined version must be unique and ordered to work with
+   * FlywayDb so each developer sets a unique version so that the migration script
+   * generated is unique (typically just prior to being submitted as a merge request).
+   */
+  private String getVersion() {
+    String envVersion = readEnvironment("ddl.migration.version");
+    if (!isEmpty(envVersion)) {
+      return envVersion.trim();
+    }
+    return version;
+  }
+
+  /**
+   * Return the migration name which is short description text that can be appended to
+   * the migration version to become the ddl script file name.
+   * <p>
+   * So if the name is "a foo table" then the ddl script file could be:
+   * "1.1.1_2__a-foo-table.sql"
+   * </p>
+   * <p>
+   * When the DB migration relates to a git feature (merge request) then this description text
+   * is a short description of the feature.
+   * </p>
+   */
+  private String getName() {
+    String envName = readEnvironment("ddl.migration.name");
+    if (!isEmpty(envName)) {
+      return envName.trim();
+    }
+    return name;
+  }
+
+  /**
+   * Return true if the string is null or empty.
+   */
+  private boolean isEmpty(String val) {
+    return val == null || val.trim().isEmpty();
+  }
+
+  /**
+   * Return the system or environment property.
+   */
+  private String readEnvironment(String key) {
+
+    String val = System.getProperty(key);
+    if (val == null) {
+      val = System.getenv(key);
+    }
+    return val;
+  }
+
   /**
    * Return the file path to write the xml and sql to.
    */
@@ -634,6 +732,8 @@ public class DefaultDbMigration implements DbMigration {
         return new DB2Platform();
       case SQLITE:
         return new SQLitePlatform();
+      case HANA:
+        return new HanaPlatform();
       case GENERIC:
         return new DatabasePlatform();
 

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/BaseDdlHandler.java

@@ -28,7 +28,11 @@ public class BaseDdlHandler implements DdlHandler {
   protected final TableDdl tableDdl;
 
   public BaseDdlHandler(ServerConfig serverConfig, PlatformDdl platformDdl) {
-    this.tableDdl = new BaseTableDdl(serverConfig, platformDdl);
+    this(serverConfig, platformDdl, new BaseTableDdl(serverConfig, platformDdl));
+  }
+  
+  protected BaseDdlHandler(ServerConfig serverConfig, PlatformDdl platformDdl, TableDdl tableDdl) {
+    this.tableDdl = tableDdl;
   }
 
   @Override

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/AbstractHanaDdl.java

@@ -0,0 +1,225 @@
+package io.ebeaninternal.dbmigration.ddlgeneration.platform;
+
+import io.ebean.config.ServerConfig;
+import io.ebean.config.dbplatform.DatabasePlatform;
+import io.ebean.config.dbplatform.DbPlatformType;
+import io.ebeaninternal.dbmigration.ddlgeneration.DdlBuffer;
+import io.ebeaninternal.dbmigration.ddlgeneration.DdlHandler;
+import io.ebeaninternal.dbmigration.migration.AlterColumn;
+
+import java.io.IOException;
+import java.util.Objects;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public abstract class AbstractHanaDdl extends PlatformDdl {
+
+  private static final Pattern ARRAY_PATTERN = Pattern.compile("(\\w+)\\s*\\[\\s*\\]\\s*(\\(\\d+\\))?", Pattern.CASE_INSENSITIVE);
+
+  public AbstractHanaDdl(DatabasePlatform platform) {
+    super(platform);
+    this.addColumn = "add (";
+    this.addColumnSuffix = ")";
+    this.alterColumn = "alter (";
+    this.alterColumnSuffix = ")";
+    this.columnDropDefault = " default null";
+    this.columnSetDefault = " default";
+    this.columnSetNotnull = " not null";
+    this.columnSetNull = " null";
+    this.dropColumn = "drop (";
+    this.dropColumnSuffix = ")";
+    this.dropConstraintIfExists = "drop constraint ";
+    this.dropIndexIfExists = "drop index ";
+    this.dropSequenceIfExists = "drop sequence ";
+    this.dropTableCascade = " cascade";
+    this.dropTableIfExists = "drop table ";
+    this.fallbackArrayType = "nvarchar(1000)";
+    this.historyDdl = new HanaHistoryDdl();
+    this.identitySuffix = " generated by default as identity";
+  }
+
+  @Override
+  public String alterColumnBaseAttributes(AlterColumn alter) {
+    String tableName = alter.getTableName();
+    String columnName = alter.getColumnName();
+    String currentType = alter.getCurrentType();
+    String type = alter.getType() != null ? alter.getType() : currentType;
+    type = convert(type, false);
+    currentType = convert(currentType, false);
+    boolean notnull = (alter.isNotnull() != null) ? alter.isNotnull() : Boolean.TRUE.equals(alter.isCurrentNotnull());
+    String notnullClause = notnull ? " not null" : "";
+    String defaultValue = DdlHelp.isDropDefault(alter.getDefaultValue()) ? "null"
+      : (alter.getDefaultValue() != null ? alter.getDefaultValue() : alter.getCurrentDefaultValue());
+    String defaultValueClause = (defaultValue == null || defaultValue.isEmpty()) ? "" : " default " + defaultValue;
+
+    try {
+      DdlBuffer buffer = new BaseDdlBuffer(null);
+      if (!isConvertible(currentType, type)) {
+        // add an intermediate conversion if possible
+        if (isNumberType(currentType)) {
+          // numbers can always be converted to decimal
+          buffer.append("alter table ").append(tableName).append(" ").append(alterColumn).append(" ").append(columnName)
+            .append(" decimal ").append(defaultValueClause).append(notnullClause).append(alterColumnSuffix)
+            .endOfStatement();
+
+        } else if (isStringType(currentType)) {
+          // strings can always be converted to nclob
+          buffer.append("alter table ").append(tableName).append(" ").append(alterColumn).append(" ").append(columnName)
+            .append(" nclob ").append(defaultValueClause).append(notnullClause).append(alterColumnSuffix)
+            .endOfStatement();
+        }
+      }
+
+      buffer.append("alter table ").append(tableName).append(" ").append(alterColumn).append(" ").append(columnName)
+        .append(" ").append(type).append(defaultValueClause).append(notnullClause).append(alterColumnSuffix);
+
+      return buffer.getBuffer();
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  @Override
+  public String alterColumnDefaultValue(String tableName, String columnName, String defaultValue) {
+    throw new UnsupportedOperationException();
+  }
+
+  @Override
+  public String alterColumnNotnull(String tableName, String columnName, boolean notnull) {
+    return null;
+  }
+
+  @Override
+  public DdlHandler createDdlHandler(ServerConfig serverConfig) {
+    return new HanaDdlHandler(serverConfig, this);
+  }
+
+  @Override
+  public String alterColumnType(String tableName, String columnName, String type) {
+    return null;
+  }
+
+  @Override
+  protected String convertArrayType(String logicalArrayType) {
+    Matcher matcher = ARRAY_PATTERN.matcher(logicalArrayType);
+    if (matcher.matches()) {
+      return convert(matcher.group(1), false) + " array" + (matcher.group(2) == null ? "" : matcher.group(2));
+    } else {
+      return fallbackArrayType;
+    }
+  }
+
+  @Override
+  public String alterTableAddUniqueConstraint(String tableName, String uqName, String[] columns, String[] nullableColumns) {
+    if (nullableColumns == null || nullableColumns.length == 0) {
+      return super.alterTableAddUniqueConstraint(tableName, uqName, columns, nullableColumns);
+    } else {
+      return "-- cannot create unique index \"" + uqName + "\" on table \"" + tableName + "\" with nullable columns";
+    }
+  }
+
+  @Override
+  public String alterTableDropUniqueConstraint(String tableName, String uniqueConstraintName) {
+    DdlBuffer buffer = new BaseDdlBuffer(null);
+    try {
+      buffer.append("delimiter $$").newLine();
+      buffer.append("do").newLine();
+      buffer.append("begin").newLine();
+      buffer.append("declare exit handler for sql_error_code 397 begin end").endOfStatement();
+      buffer.append("exec 'alter table ").append(tableName).append(" ").append(dropUniqueConstraint).append(" ")
+        .append(maxConstraintName(uniqueConstraintName)).append("'").endOfStatement();
+      buffer.append("end").endOfStatement();
+      buffer.append("$$");
+      return buffer.getBuffer();
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  @Override
+  public String alterTableDropConstraint(String tableName, String constraintName) {
+    return alterTableDropUniqueConstraint(tableName, constraintName);
+  }
+
+  /**
+   * It is rather complex to delete a column on HANA as there must not exist any
+   * foreign keys. That's why we call a user stored procedure here
+   */
+  @Override
+  public void alterTableDropColumn(DdlBuffer buffer, String tableName, String columnName) throws IOException {
+    buffer.append("CALL usp_ebean_drop_column('").append(tableName).append("', '").append(columnName).append("')")
+      .endOfStatement();
+  }
+
+  /**
+   * Check if a data type can be converted to another data type. Data types can't
+   * be converted if the target type has a lower precision than the source type.
+   *
+   * @param sourceType The source data type
+   * @param targetType the target data type
+   * @return {@code true} if the type can be converted, {@code false} otherwise
+   */
+  private boolean isConvertible(String sourceType, String targetType) {
+    if (Objects.equals(sourceType, targetType)) {
+      return true;
+    }
+
+    if (sourceType == null || targetType == null) {
+      return true;
+    }
+
+    if ("bigint".equals(sourceType)) {
+      if ("integer".equals(targetType) || "smallint".equals(targetType) || "tinyint".equals(targetType)) {
+        return false;
+      }
+    } else if ("integer".equals(sourceType)) {
+      if ("smallint".equals(targetType) || "tinyint".equals(targetType)) {
+        return false;
+      }
+    } else if ("smallint".equals(sourceType)) {
+      if ("tinyint".equals(targetType)) {
+        return false;
+      }
+    } else if ("double".equals(sourceType)) {
+      if ("real".equals(targetType)) {
+        return false;
+      }
+    }
+
+    DbPlatformType dbPlatformSourceType = DbPlatformType.parse(sourceType);
+
+    if ("float".equals(dbPlatformSourceType.getName())) {
+      if ("real".equals(targetType)) {
+        return false;
+      }
+    } else if ("varchar".equals(dbPlatformSourceType.getName()) || "nvarchar".equals(dbPlatformSourceType.getName())) {
+      DbPlatformType dbPlatformTargetType = DbPlatformType.parse(targetType);
+      if ("varchar".equals(dbPlatformTargetType.getName()) || "nvarchar".equals(dbPlatformTargetType.getName())) {
+        if (dbPlatformSourceType.getDefaultLength() > dbPlatformTargetType.getDefaultLength()) {
+          return false;
+        }
+      }
+    } else if ("decimal".equals(dbPlatformSourceType.getName())) {
+      DbPlatformType dbPlatformTargetType = DbPlatformType.parse(targetType);
+      if ("decimal".equals(dbPlatformTargetType.getName())) {
+        if (dbPlatformSourceType.getDefaultLength() > dbPlatformTargetType.getDefaultLength()
+          || dbPlatformSourceType.getDefaultScale() > dbPlatformTargetType.getDefaultScale()) {
+          return false;
+        }
+      }
+    }
+
+    return true;
+  }
+
+  private boolean isNumberType(String type) {
+    return type != null
+      && ("bigint".equals(type) || "integer".equals(type) || "smallint".equals(type) || "tinyint".equals(type)
+      || type.startsWith("float") || "real".equals(type) || "double".equals(type) || type.startsWith("decimal"));
+  }
+
+  private boolean isStringType(String type) {
+    return type != null
+      && (type.startsWith("varchar") || type.startsWith("nvarchar") || "clob".equals(type) || "nclob".equals(type));
+  }
+}

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/BaseTableDdl.java

@@ -257,15 +257,19 @@ public class BaseTableDdl implements TableDdl {
       useSequence = (IdType.SEQUENCE == useDbIdentityType);
     }
 
+    String partitionMode = createTable.getPartitionMode();
+
     DdlBuffer apply = writer.apply();
-    apply.append("create table ").append(tableName).append(" (");
+    apply.append(platformDdl.getCreateTableCommandPrefix()).append(" ").append(tableName).append(" (");
     writeTableColumns(apply, columns, useIdentity);
     writeCheckConstraints(apply, createTable);
     writeUniqueConstraints(apply, createTable);
     writeCompoundUniqueConstraints(apply, createTable);
     if (!pk.isEmpty()) {
       // defined on the columns
-      writePrimaryKeyConstraint(apply, createTable.getPkName(), toColumnNames(pk));
+      if (partitionMode == null || !platformDdl.suppressPrimaryKeyOnPartition()) {
+        writePrimaryKeyConstraint(apply, createTable.getPkName(), toColumnNames(pk));
+      }
     }
     if (platformDdl.isInlineForeignKeys()) {
       writeInlineForeignKeys(writer, createTable);
@@ -273,6 +277,9 @@ public class BaseTableDdl implements TableDdl {
 
     apply.newLine().append(")");
     addTableCommentInline(apply, createTable);
+    if (partitionMode != null) {
+      platformDdl.addTablePartition(apply, partitionMode, createTable.getPartitionColumn());
+    }
     apply.endOfStatement();
 
     addComments(apply, createTable);
@@ -902,7 +909,7 @@ public class BaseTableDdl implements TableDdl {
     if (hasValue(ddl)) {
       writer.apply().append(ddl).endOfStatement();
 
-      if (isTrue(alter.isWithHistory()) && alter.getType() != null && historySupport == historySupport.TRIGGER_BASED) {
+      if (isTrue(alter.isWithHistory()) && alter.getType() != null && historySupport == HistorySupport.TRIGGER_BASED) {
         // mysql and sql server column type change allowing nulls in the history table column
         regenerateHistoryTriggers(alter.getTableName(), HistoryTableUpdate.Change.ALTER, alter.getColumnName());
         AlterColumn alterHistoryColumn = new AlterColumn();

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/DbTriggerBasedHistoryDdl.java

@@ -175,7 +175,7 @@ public abstract class DbTriggerBasedHistoryDdl implements PlatformHistoryDdl {
 
   protected void createHistoryTable(DdlBuffer apply, MTable table) throws IOException {
 
-    apply.append("create table ").append(table.getName()).append(historySuffix).append("(").newLine();
+    apply.append(platformDdl.getCreateTableCommandPrefix()).append(" ").append(table.getName()).append(historySuffix).append("(").newLine();
 
     Collection<MColumn> cols = table.allColumns();
     for (MColumn column : cols) {
@@ -238,8 +238,8 @@ public abstract class DbTriggerBasedHistoryDdl implements PlatformHistoryDdl {
   }
 
   protected void dropSysPeriodColumns(DdlBuffer buffer, String baseTableName) throws IOException {
-    buffer.append("alter table ").append(baseTableName).append(" drop column ").append(sysPeriodStart).endOfStatement();
-    buffer.append("alter table ").append(baseTableName).append(" drop column ").append(sysPeriodEnd).endOfStatement();
+    platformDdl.alterTableDropColumn(buffer, baseTableName, sysPeriodStart);
+    platformDdl.alterTableDropColumn(buffer, baseTableName, sysPeriodEnd);
   }
 
   protected void appendInsertIntoHistory(DdlBuffer buffer, String historyTable, List<String> columns) throws IOException {

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/HanaColumnStoreDdl.java

@@ -0,0 +1,51 @@
+package io.ebeaninternal.dbmigration.ddlgeneration.platform;
+
+import java.io.IOException;
+
+import io.ebean.config.dbplatform.DatabasePlatform;
+import io.ebeaninternal.dbmigration.ddlgeneration.DdlBuffer;
+
+public class HanaColumnStoreDdl extends AbstractHanaDdl {
+
+  public HanaColumnStoreDdl(DatabasePlatform platform) {
+    super(platform);
+    this.createTable = "create column table";
+  }
+
+  @Override
+  public String createIndex(String indexName, String tableName, String[] columns) {
+    if (columns == null || columns.length == 0) {
+      return "-- cannot create index: no columns given";
+    }
+
+    if (columns.length == 1) {
+      return "-- explicit index \"" + indexName + "\" for single column \"" + columns[0] + "\" of table \"" + tableName
+          + "\" is not necessary";
+    }
+
+    StringBuilder buffer = new StringBuilder();
+    buffer.append("create inverted hash index ").append(maxConstraintName(indexName)).append(" on ").append(tableName);
+    appendColumns(columns, buffer);
+
+    return buffer.toString();
+  }
+
+  @Override
+  public String dropIndex(String indexName, String tableName) {
+    DdlBuffer buffer = new BaseDdlBuffer(null);
+    try {
+      buffer.append("delimiter $$").newLine();
+      buffer.append("do").newLine();
+      buffer.append("begin").newLine();
+      buffer.append("declare exit handler for sql_error_code 261 begin end").endOfStatement();
+      buffer.append("exec '").append(dropIndexIfExists).append(maxConstraintName(indexName)).append("'")
+          .endOfStatement();
+      buffer.append("end").endOfStatement();
+      buffer.append("$$");
+      return buffer.getBuffer();
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+}

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/HanaDdlHandler.java

@@ -0,0 +1,11 @@
+package io.ebeaninternal.dbmigration.ddlgeneration.platform;
+
+import io.ebean.config.ServerConfig;
+import io.ebeaninternal.dbmigration.ddlgeneration.BaseDdlHandler;
+
+public class HanaDdlHandler extends BaseDdlHandler {
+
+  public HanaDdlHandler(ServerConfig serverConfig, PlatformDdl platformDdl) {
+    super(serverConfig, platformDdl, new HanaTableDdl(serverConfig, platformDdl));
+  }
+}

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/HanaHistoryDdl.java

@@ -0,0 +1,157 @@
+package io.ebeaninternal.dbmigration.ddlgeneration.platform;
+
+import io.ebean.config.ServerConfig;
+import io.ebeaninternal.dbmigration.ddlgeneration.DdlBuffer;
+import io.ebeaninternal.dbmigration.ddlgeneration.DdlWrite;
+import io.ebeaninternal.dbmigration.migration.AddHistoryTable;
+import io.ebeaninternal.dbmigration.migration.DropHistoryTable;
+import io.ebeaninternal.dbmigration.model.MColumn;
+import io.ebeaninternal.dbmigration.model.MTable;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class HanaHistoryDdl implements PlatformHistoryDdl {
+
+  private String systemPeriodStart;
+  private String systemPeriodEnd;
+  private PlatformDdl platformDdl;
+  private String historySuffix;
+  private final AtomicInteger counter = new AtomicInteger(0);
+  private Map<String, String> createdHistoryTables = new ConcurrentHashMap<>();
+
+  @Override
+  public void configure(ServerConfig serverConfig, PlatformDdl platformDdl) {
+    this.systemPeriodStart = serverConfig.getAsOfSysPeriod() + "_start";
+    this.systemPeriodEnd = serverConfig.getAsOfSysPeriod() + "_end";
+    this.platformDdl = platformDdl;
+    this.historySuffix = serverConfig.getHistoryTableSuffix();
+  }
+
+  @Override
+  public void createWithHistory(DdlWrite writer, MTable table) throws IOException {
+    String tableName = table.getName();
+    String historyTableName = tableName + historySuffix;
+    DdlBuffer apply = writer.applyHistoryView();
+    if (apply.isEmpty()) {
+      createdHistoryTables.clear();
+    }
+
+    apply.append(platformDdl.getCreateTableCommandPrefix()).append(" ").append(historyTableName).append(" (").newLine();
+
+    // create history table
+    Collection<MColumn> cols = table.allColumns();
+    for (MColumn column : cols) {
+      if (!column.isDraftOnly()) {
+        writeColumnDefinition(apply, column.getName(), column.getType(), column.getDefaultValue(), column.isNotnull(),
+          column.isIdentity() ? platformDdl.identitySuffix : null);
+        apply.append(",").newLine();
+      }
+    }
+    writeColumnDefinition(apply, systemPeriodStart, "TIMESTAMP", null, false, null);
+    apply.append(",").newLine();
+    writeColumnDefinition(apply, systemPeriodEnd, "TIMESTAMP", null, false, null);
+    apply.newLine().append(")").endOfStatement();
+
+    // enable system versioning
+    apply.append("alter table ").append(tableName).append(" add (").newLine();
+    apply.append("    ").append(systemPeriodStart).append(" TIMESTAMP NOT NULL GENERATED ALWAYS AS ROW START, ").newLine();
+    apply.append("    ").append(systemPeriodEnd).append(" TIMESTAMP NOT NULL GENERATED ALWAYS AS ROW END").newLine();
+    apply.append(")").endOfStatement();
+
+    apply.append("alter table ").append(tableName).append(" add period for system_time(").append(systemPeriodStart)
+      .append(",").append(systemPeriodEnd).append(")").endOfStatement();
+
+    enableSystemVersioning(apply, tableName, historyTableName, true, false);
+
+    createdHistoryTables.put(tableName, historyTableName);
+
+    dropHistoryTable(writer.dropAll(), tableName, historyTableName);
+  }
+
+  @Override
+  public void dropHistoryTable(DdlWrite writer, DropHistoryTable dropHistoryTable) throws IOException {
+    dropHistoryTable(writer.applyDropDependencies(), dropHistoryTable.getBaseTable(),
+      dropHistoryTable.getBaseTable() + historySuffix);
+  }
+
+  protected void dropHistoryTable(DdlBuffer apply, String baseTable, String historyTable) throws IOException {
+    // disable system versioning
+    disableSystemVersioning(apply, baseTable);
+
+    apply.append("alter table ").append(baseTable).append(" drop period for system_time").endOfStatement();
+
+    // drop the period columns
+    apply.append("alter table ").append(baseTable).append(" drop (").append(systemPeriodStart).append(",")
+      .append(systemPeriodEnd).append(")").endOfStatement();
+
+    // drop the history table
+    apply.append("drop table ").append(historyTable).append(" cascade").endOfStatement();
+  }
+
+  @Override
+  public void addHistoryTable(DdlWrite writer, AddHistoryTable addHistoryTable) throws IOException {
+    MTable table = writer.getTable(addHistoryTable.getBaseTable());
+    if (table == null) {
+      throw new IllegalStateException("MTable " + addHistoryTable.getBaseTable() + " not found in writer? (required for history DDL)");
+    }
+    createWithHistory(writer, table);
+  }
+
+  @Override
+  public void updateTriggers(DdlWrite write, HistoryTableUpdate baseTable) {
+    // nothing to do
+  }
+
+  protected void writeColumnDefinition(DdlBuffer buffer, String columnName, String type, String defaultValue,
+                                       boolean isNotNull, String generated) throws IOException {
+
+    String platformType = platformDdl.convert(type, false);
+    buffer.append(" ").append(platformDdl.lowerColumnName(columnName));
+    buffer.append(" ").append(platformType);
+    if (defaultValue != null) {
+      buffer.append(" default ").append(defaultValue);
+    }
+    if (isNotNull) {
+      buffer.append(" not null");
+    }
+    if (generated != null) {
+      buffer.append(" ").append(generated);
+    }
+  }
+
+  public void disableSystemVersioning(DdlBuffer apply, String tableName) throws IOException {
+    disableSystemVersioning(apply, tableName, false);
+  }
+
+  public void disableSystemVersioning(DdlBuffer apply, String tableName, boolean uniqueStatement) throws IOException {
+    apply.append("alter table ").append(tableName).append(" drop system versioning");
+    if (uniqueStatement) {
+      // needed for the DB migration test to prevent the statement from being filtered
+      // out as a duplicate
+      apply.append(" /* ").append(String.valueOf(counter.getAndIncrement())).append(" */");
+    }
+    apply.endOfStatement();
+  }
+
+  public void enableSystemVersioning(DdlBuffer apply, String tableName, String historyTableName, boolean validated,
+                                     boolean uniqueStatement) throws IOException {
+    apply.append("alter table ").append(tableName).append(" add system versioning history table ").append(historyTableName);
+    if (!validated) {
+      apply.append(" not validated");
+    }
+    if (uniqueStatement) {
+      // needed for the DB migration test to prevent the statement from being filtered
+      // out as a duplicate
+      apply.append(" /* ").append(String.valueOf(counter.getAndIncrement())).append(" */");
+    }
+    apply.endOfStatement();
+  }
+
+  public boolean isSystemVersioningEnabled(String tableName) {
+    return !createdHistoryTables.containsKey(tableName);
+  }
+}

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/HanaRowStoreDdl.java

@@ -0,0 +1,11 @@
+package io.ebeaninternal.dbmigration.ddlgeneration.platform;
+
+import io.ebean.config.dbplatform.DatabasePlatform;
+
+public class HanaRowStoreDdl extends AbstractHanaDdl {
+
+  public HanaRowStoreDdl(DatabasePlatform platform) {
+    super(platform);
+    this.createTable = "create row table";
+  }
+}

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/HanaTableDdl.java

@@ -0,0 +1,134 @@
+package io.ebeaninternal.dbmigration.ddlgeneration.platform;
+
+import java.io.IOException;
+import java.util.List;
+
+import io.ebean.config.PropertiesWrapper;
+import io.ebean.config.ServerConfig;
+import io.ebeaninternal.dbmigration.ddlgeneration.DdlWrite;
+import io.ebeaninternal.dbmigration.migration.AddColumn;
+import io.ebeaninternal.dbmigration.migration.AlterColumn;
+import io.ebeaninternal.dbmigration.migration.Column;
+import io.ebeaninternal.dbmigration.migration.DropColumn;
+import io.ebeaninternal.dbmigration.model.MTable;
+
+public class HanaTableDdl extends BaseTableDdl {
+
+  private final HanaHistoryDdl historyDdl;
+  private final boolean generateUniqueDdl;
+
+  public HanaTableDdl(ServerConfig serverConfig, PlatformDdl platformDdl) {
+    super(serverConfig, platformDdl);
+    this.historyDdl = (HanaHistoryDdl) platformDdl.historyDdl;
+    if (serverConfig.getProperties() != null) {
+      PropertiesWrapper wrapper = new PropertiesWrapper("ebean", "hana", serverConfig.getProperties(), serverConfig.getClassLoadConfig());
+      this.generateUniqueDdl = wrapper.getBoolean("generateUniqueDdl", false);
+    } else {
+      this.generateUniqueDdl = false;
+    }
+  }
+
+  @Override
+  protected void alterColumnDefaultValue(DdlWrite writer, AlterColumn alter) throws IOException {
+    String ddl = platformDdl.alterColumnBaseAttributes(alter);
+    if (hasValue(ddl)) {
+      writer.apply().append(ddl).endOfStatement();
+    }
+  }
+
+  @Override
+  public void generate(DdlWrite writer, AddColumn addColumn) throws IOException {
+    String tableName = addColumn.getTableName();
+    MTable table = writer.getTable(tableName);
+    if (table == null) {
+      super.generate(writer, addColumn);
+      return;
+    }
+
+    boolean manageSystemVersioning = isTrue(table.isWithHistory()) && historyDdl.isSystemVersioningEnabled(tableName);
+
+    if (manageSystemVersioning) {
+      historyDdl.disableSystemVersioning(writer.apply(), table.getName(), this.generateUniqueDdl);
+    }
+
+    super.generate(writer, addColumn);
+
+    if (manageSystemVersioning) {
+      // make same changes to the history table
+      String historyTable = historyTable(tableName);
+      List<Column> columns = addColumn.getColumn();
+      for (Column column : columns) {
+        alterTableAddColumn(writer.apply(), historyTable, column, true, true);
+      }
+
+      historyDdl.enableSystemVersioning(writer.apply(), table.getName(), historyTable, false, this.generateUniqueDdl);
+    }
+  }
+
+  @Override
+  public void generate(DdlWrite writer, AlterColumn alterColumn) throws IOException {
+    String tableName = alterColumn.getTableName();
+    MTable table = writer.getTable(tableName);
+    if (table == null) {
+      super.generate(writer, alterColumn);
+      return;
+    }
+
+    boolean manageSystemVersioning = isTrue(table.isWithHistory()) && historyDdl.isSystemVersioningEnabled(tableName);
+
+    if (manageSystemVersioning) {
+      historyDdl.disableSystemVersioning(writer.apply(), tableName, this.generateUniqueDdl);
+    }
+
+    super.generate(writer, alterColumn);
+
+    if (manageSystemVersioning) {
+      // make same changes to the history table
+      String historyTable = historyTable(tableName);
+      if (hasValue(alterColumn.getType()) || hasValue(alterColumn.getDefaultValue()) || alterColumn.isNotnull() != null) {
+        AlterColumn alterHistoryColumn = new AlterColumn();
+        alterHistoryColumn.setTableName(historyTable);
+        alterHistoryColumn.setColumnName(alterColumn.getColumnName());
+        alterHistoryColumn.setType(alterColumn.getType());
+        alterHistoryColumn.setDefaultValue(alterColumn.getDefaultValue());
+        alterHistoryColumn.setNotnull(alterColumn.isNotnull());
+        alterHistoryColumn.setCurrentType(alterColumn.getCurrentType());
+        alterHistoryColumn.setCurrentDefaultValue(alterColumn.getCurrentDefaultValue());
+        alterHistoryColumn.setCurrentNotnull(alterColumn.isCurrentNotnull());
+        String histColumnDdl = platformDdl.alterColumnBaseAttributes(alterHistoryColumn);
+
+        // write the apply to history table
+        writer.apply().append(histColumnDdl).endOfStatement();
+      }
+
+      historyDdl.enableSystemVersioning(writer.apply(), tableName, historyTable, false, this.generateUniqueDdl);
+    }
+  }
+
+  @Override
+  public void generate(DdlWrite writer, DropColumn dropColumn) throws IOException {
+    String tableName = dropColumn.getTableName();
+    MTable table = writer.getTable(tableName);
+    if (table == null) {
+      super.generate(writer, dropColumn);
+      return;
+    }
+
+    boolean manageSystemVersioning = isTrue(table.isWithHistory()) && historyDdl.isSystemVersioningEnabled(tableName);
+
+    if (manageSystemVersioning) {
+      historyDdl.disableSystemVersioning(writer.apply(), tableName, this.generateUniqueDdl);
+    }
+
+    super.generate(writer, dropColumn);
+
+    if (manageSystemVersioning) {
+      // also drop from the history table
+      String historyTable = historyTable(tableName);
+      alterTableDropColumn(writer.apply(), historyTable, dropColumn.getColumnName());
+
+      historyDdl.enableSystemVersioning(writer.apply(), tableName, historyTable, false, this.generateUniqueDdl);
+    }
+  }
+
+}

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/MySqlDdl.java

@@ -38,6 +38,16 @@ public class MySqlDdl extends PlatformDdl {
     return "alter table " + tableName + " drop foreign key " + maxConstraintName(fkName);
   }
 
+  /**
+   * It is rather complex to delete a column on MySql as there must not exist any foreign keys.
+   * That's why we call a user stored procedure here
+   */
+  @Override
+  public void alterTableDropColumn(DdlBuffer buffer, String tableName, String columnName) throws IOException {
+
+    buffer.append("CALL usp_ebean_drop_column('").append(tableName).append("', '").append(columnName).append("')").endOfStatement();
+  }
+
   @Override
   public String alterTableDropConstraint(String tableName, String constraintName) {
     // drop constraint not supported in MySQL 5.7 and 8.0 but starting with MariaDB 10.2.1 CHECK is evaluated
@@ -61,7 +71,7 @@ public class MySqlDdl extends PlatformDdl {
   @Override
   public String alterColumnDefaultValue(String tableName, String columnName, String defaultValue) {
 
-    String suffix = DdlHelp.isDropDefault(defaultValue) ? columnDropDefault : columnSetDefault + " " + defaultValue;
+    String suffix = DdlHelp.isDropDefault(defaultValue) ? columnDropDefault : columnSetDefault + " " + convertDefaultValue(defaultValue);
 
     // use alter
     return "alter table " + tableName + " alter " + columnName + " " + suffix;

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/PlatformDdl.java

@@ -78,12 +78,16 @@ public class PlatformDdl {
   protected String dropIndexIfExists = "drop index if exists ";
 
   protected String alterColumn = "alter column";
+  
+  protected String alterColumnSuffix = "";
 
   protected String dropUniqueConstraint = "drop constraint";
 
   protected String addConstraint = "add constraint";
 
   protected String addColumn = "add column";
+  
+  protected String addColumnSuffix = "";
 
   protected String columnSetType = "";
 
@@ -96,6 +100,12 @@ public class PlatformDdl {
   protected String columnSetNull = "set null";
 
   protected String updateNullWithDefault = "update ${table} set ${column} = ${default} where ${column} is null";
+  
+  protected String createTable = "create table";
+  
+  protected String dropColumn = "drop column";
+  
+  protected String dropColumnSuffix = "";
 
   /**
    * Set false for MsSqlServer to allow multiple nulls for OneToOne mapping.
@@ -246,6 +256,9 @@ public class PlatformDdl {
    * Convert the standard type to the platform specific type.
    */
   public String convert(String type, boolean identity) {
+    if (type == null) {
+      return null;
+    }
     if (type.contains("[]")) {
       return convertArrayType(type);
     }
@@ -455,6 +468,7 @@ public class PlatformDdl {
       if (isTrue(column.isNotnull())) {
         buffer.append(" not null");
       }
+      buffer.append(addColumnSuffix);
       buffer.endOfStatement();
 
       // check constraints cannot be added in one statement for h2
@@ -464,14 +478,15 @@ public class PlatformDdl {
         buffer.append(ddl).endOfStatement();
       }
     } else {
+      buffer.append(addColumnSuffix);
       buffer.endOfStatement();
     }
 
   }
 
   public void alterTableDropColumn(DdlBuffer buffer, String tableName, String columnName) throws IOException {
-    buffer.append("alter table ").append(tableName).append(" drop column ").append(columnName)
-    .endOfStatement();
+    buffer.append("alter table ").append(tableName).append(" ").append(dropColumn).append(" ").append(columnName)
+    .append(dropColumnSuffix).endOfStatement();
   }
 
   /**
@@ -491,19 +506,19 @@ public class PlatformDdl {
    */
   public String alterColumnType(String tableName, String columnName, String type) {
 
-    return "alter table " + tableName + " " + alterColumn + " " + columnName + " " + columnSetType + convert(type, false);
+    return "alter table " + tableName + " " + alterColumn + " " + columnName + " " + columnSetType + convert(type, false) + alterColumnSuffix;
   }
 
   /**
    * Alter a column adding or removing the not null constraint.
    * <p>
-   * Note that that MySql and SQL Server instead use alterColumnBaseAttributes()
+   * Note that that MySql, SQL Server, and HANA instead use alterColumnBaseAttributes()
    * </p>
    */
   public String alterColumnNotnull(String tableName, String columnName, boolean notnull) {
 
     String suffix = notnull ? columnSetNotnull : columnSetNull;
-    return "alter table " + tableName + " " + alterColumn + " " + columnName + " " + suffix;
+    return "alter table " + tableName + " " + alterColumn + " " + columnName + " " + suffix + alterColumnSuffix;
   }
 
   /**
@@ -519,17 +534,17 @@ public class PlatformDdl {
    */
   public String alterColumnDefaultValue(String tableName, String columnName, String defaultValue) {
     String suffix = DdlHelp.isDropDefault(defaultValue) ? columnDropDefault : columnSetDefault + " " + convertDefaultValue(defaultValue);
-    return "alter table " + tableName + " " + alterColumn + " " + columnName + " " + suffix;
+    return "alter table " + tableName + " " + alterColumn + " " + columnName + " " + suffix + alterColumnSuffix;
   }
 
   /**
    * Alter column setting both the type and not null constraint.
    * <p>
-   * Used by MySql and SQL Server as these require both column attributes to be set together.
+   * Used by MySql, SQL Server, and HANA as these require both column attributes to be set together.
    * </p>
    */
   public String alterColumnBaseAttributes(AlterColumn alter) {
-    // by default do nothing, only used by mysql and sql server as they can only
+    // by default do nothing, only used by mysql, sql server, and HANA as they can only
     // modify the column with the full column definition
     return null;
   }
@@ -659,4 +674,23 @@ public class PlatformDdl {
   public void unlockTables(DdlBuffer buffer, Collection<String> tables) throws IOException {
 
   }
+  
+  /**
+   * Returns the database-specific "create table" command prefix. For HANA this is
+   * either "create column table" or "create row table", for all other databases
+   * it is "create table".
+   * 
+   * @return The "create table" command prefix
+   */
+  public String getCreateTableCommandPrefix() {
+    return createTable;
+  }
+
+  public boolean suppressPrimaryKeyOnPartition() {
+    return false;
+  }
+
+  public void addTablePartition(DdlBuffer apply, String partitionMode, String partitionColumn) throws IOException {
+    // only supported by postgres initially
+  }
 }

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/PostgresDdl.java

@@ -1,6 +1,9 @@
 package io.ebeaninternal.dbmigration.ddlgeneration.platform;
 
 import io.ebean.config.dbplatform.DatabasePlatform;
+import io.ebeaninternal.dbmigration.ddlgeneration.DdlBuffer;
+
+import java.io.IOException;
 
 /**
  * Postgres specific DDL.
@@ -16,6 +19,11 @@ public class PostgresDdl extends PlatformDdl {
     this.columnSetNull = "drop not null";
   }
 
+  @Override
+  public boolean suppressPrimaryKeyOnPartition() {
+    return true;
+  }
+
   @Override
   protected String convertArrayType(String logicalArrayType) {
     return NativeDbArray.logicalToNative(logicalArrayType);
@@ -38,4 +46,9 @@ public class PostgresDdl extends PlatformDdl {
     }
     return columnDefn;
   }
+
+  @Override
+  public void addTablePartition(DdlBuffer apply, String partitionMode, String partitionColumn) throws IOException {
+    apply.append(" partition by range (").append(partitionColumn).append(")");
+  }
 }

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/SqlServerDdl.java

@@ -3,7 +3,9 @@ package io.ebeaninternal.dbmigration.ddlgeneration.platform;
 import io.ebean.annotation.ConstraintMode;
 import io.ebean.config.dbplatform.DatabasePlatform;
 import io.ebeaninternal.dbmigration.ddlgeneration.DdlBuffer;
+import io.ebeaninternal.dbmigration.ddlgeneration.DdlWrite;
 import io.ebeaninternal.dbmigration.migration.AlterColumn;
+import io.ebeaninternal.server.persist.platform.MultiValueBind;
 
 import java.io.IOException;
 
@@ -137,13 +139,7 @@ public class SqlServerDdl extends PlatformDdl {
     // a rather complex statement.
     StringBuilder sb = new StringBuilder();
     if (DdlHelp.isDropDefault(defaultValue)) {
-      sb.append("delimiter $$\n");
-      sb.append("DECLARE @Tmp nvarchar(200);");
-      sb.append("select @Tmp = t1.name  from sys.default_constraints t1\n");
-      sb.append("  join sys.columns t2 on t1.object_id = t2.default_object_id\n");
-      sb.append("  where t1.parent_object_id = OBJECT_ID('").append(tableName)
-        .append("') and t2.name = '").append(columnName).append("';\n");
-      sb.append("if @Tmp is not null EXEC('alter table ").append(tableName).append(" drop constraint ' + @Tmp)$$");
+      sb.append("EXEC usp_ebean_drop_default_constraint ").append(tableName).append(", ").append(columnName);
     } else {
       sb.append("alter table ").append(tableName);
       sb.append(" add default ").append(convertDefaultValue(defaultValue)).append(" for ").append(columnName);
@@ -200,25 +196,50 @@ public class SqlServerDdl extends PlatformDdl {
 
   /**
    * It is rather complex to delete a column on SqlServer as there must not exist any references
-   * (constraints, default values, indices and foreign keys). The list is not yet complete, as
-   * indices over multiple columns will not yet deleted.
-   * (This may be changed to delete all refering objects by using the sys.* tables later)
+   * (constraints, default values, indices and foreign keys). That's why we call a user stored procedure here
    */
   @Override
   public void alterTableDropColumn(DdlBuffer buffer, String tableName, String columnName) throws IOException {
-    buffer.append("-- drop column ").append(tableName).append(".").append(columnName).endOfStatement();
 
-    buffer.append(alterTableDropUniqueConstraint(tableName, naming.uniqueConstraintName(tableName, columnName)));
-    buffer.endOfStatement();
-    buffer.append(alterColumnDefaultValue(tableName, columnName, DdlHelp.DROP_DEFAULT));
-    buffer.endOfStatement();
-    buffer.append(alterTableDropConstraint(tableName, naming.checkConstraintName(tableName, columnName)));
-    buffer.endOfStatement();
-    buffer.append(dropIndex(naming.indexName(tableName, columnName), tableName));
-    buffer.endOfStatement();
-    buffer.append(alterTableDropForeignKey(tableName, naming.foreignKeyConstraintName(tableName, columnName)));
-    buffer.endOfStatement();
-    super.alterTableDropColumn(buffer, tableName, columnName);
+    buffer.append("EXEC usp_ebean_drop_column ").append(tableName).append(", ").append(columnName).endOfStatement();
+  }
+
+  /**
+   * This writes the multi value datatypes needed for {@link MultiValueBind}
+   */
+  @Override
+  public void generateProlog(DdlWrite write) throws IOException {
+    super.generateProlog(write);
+
+    generateTVPDefinitions(write, "bigint");
+    generateTVPDefinitions(write, "float");
+    generateTVPDefinitions(write, "bit");
+    generateTVPDefinitions(write, "date");
+    generateTVPDefinitions(write, "time");
+    //generateTVPDefinitions(write, "datetime2");
+    generateTVPDefinitions(write, "uniqueidentifier");
+    generateTVPDefinitions(write, "nvarchar(max)");
+
+  }
+
+  private void generateTVPDefinitions(DdlWrite write, String definition) throws IOException {
+    int pos = definition.indexOf('(');
+    String name = pos == -1 ? definition : definition.substring(0, pos);
+
+    dropTVP(write.dropAll(), name);
+    //TVPs are included in "I__create_procs.sql"
+    //createTVP(write.apply(), name, definition);
+  }
+
+  private void dropTVP(DdlBuffer ddl, String name) throws IOException {
+    ddl.append("if exists (select name  from sys.types where name = 'ebean_").append(name)
+        .append("_tvp') drop type ebean_").append(name).append("_tvp").endOfStatement();
+  }
+
+  private void createTVP(DdlBuffer ddl, String name, String definition) throws IOException {
+    ddl.append("if not exists (select name  from sys.types where name = 'ebean_").append(name)
+    .append("_tvp') create type ebean_").append(name).append("_tvp as table (c1 ").append(definition).append(")")
+        .endOfStatement();
   }
 
 }

src/main/java/io/ebeaninternal/dbmigration/migration/AddColumn.java

@@ -12,9 +12,9 @@ import java.util.List;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>
@@ -45,20 +45,20 @@ public class AddColumn {
 
   /**
    * Gets the value of the column property.
-   * <p>
+   *
    * <p>
    * This accessor method returns a reference to the live list,
    * not a snapshot. Therefore any modification you make to the
    * returned list will be present inside the JAXB object.
    * This is why there is not a <CODE>set</CODE> method for the column property.
-   * <p>
+   *
    * <p>
    * For example, to add a new item, do as follows:
    * <pre>
    *    getColumn().add(newItem);
    * </pre>
-   * <p>
-   * <p>
+   *
+   *
    * <p>
    * Objects of the following type(s) are allowed in the list
    * {@link Column }

src/main/java/io/ebeaninternal/dbmigration/migration/AddHistoryTable.java

@@ -9,9 +9,9 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>

src/main/java/io/ebeaninternal/dbmigration/migration/AddTableComment.java

@@ -9,9 +9,9 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>

src/main/java/io/ebeaninternal/dbmigration/migration/AddUniqueConstraint.java

@@ -9,11 +9,21 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
- * TODO
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;attribute name="constraintName" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="tableName" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="columnNames" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="oneToOne" type="{http://www.w3.org/2001/XMLSchema}boolean" />
+ *       &lt;attribute name="nullableColumns" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
  * </pre>
  */
 @XmlAccessorType(XmlAccessType.FIELD)
@@ -23,18 +33,14 @@ public class AddUniqueConstraint {
 
   @XmlAttribute(name = "constraintName", required = true)
   protected String constraintName;
-
   @XmlAttribute(name = "tableName", required = true)
   protected String tableName;
-
   @XmlAttribute(name = "columnNames", required = true)
   protected String columnNames;
-
-  @XmlAttribute(name = "nullableColumns", required = true)
-  protected String nullableColumns;
-    
-  @XmlAttribute(name = "oneToOne", required = false)
+  @XmlAttribute(name = "oneToOne")
   protected Boolean oneToOne;
+  @XmlAttribute(name = "nullableColumns")
+  protected String nullableColumns;
 
   /**
    * Gets the value of the constraintName property.
@@ -55,7 +61,7 @@ public class AddUniqueConstraint {
   public void setConstraintName(String value) {
     this.constraintName = value;
   }
-  
+
   /**
    * Gets the value of the tableName property.
    *
@@ -65,15 +71,15 @@ public class AddUniqueConstraint {
   public String getTableName() {
     return tableName;
   }
-  
+
   /**
    * Sets the value of the tableName property.
    *
    * @param value allowed object is
    *              {@link String }
    */
-  public void setTableName(String tableName) {
-    this.tableName = tableName;
+  public void setTableName(String value) {
+    this.tableName = value;
   }
 
   /**
@@ -96,6 +102,26 @@ public class AddUniqueConstraint {
     this.columnNames = value;
   }
 
+  /**
+   * Gets the value of the oneToOne property.
+   *
+   * @return possible object is
+   * {@link Boolean }
+   */
+  public Boolean isOneToOne() {
+    return oneToOne;
+  }
+
+  /**
+   * Sets the value of the oneToOne property.
+   *
+   * @param value allowed object is
+   *              {@link Boolean }
+   */
+  public void setOneToOne(Boolean value) {
+    this.oneToOne = value;
+  }
+
   /**
    * Gets the value of the nullableColumns property.
    *
@@ -115,23 +141,5 @@ public class AddUniqueConstraint {
   public void setNullableColumns(String value) {
     this.nullableColumns = value;
   }
-  
-  /**
-   * Gets the value of the oneToOne property.
-   *
-   * @return true if oneToOne was set
-   */
-  public boolean isOneToOne() {
-    return Boolean.TRUE.equals(oneToOne);
-  }
-
-  /**
-   * Sets the value of the oneToOne property.
-   *
-   * @param value boolean
-   */
-  public void setOneToOne(boolean oneToOne) {
-    this.oneToOne = oneToOne;
-  }
 
 }

src/main/java/io/ebeaninternal/dbmigration/migration/AlterColumn.java

@@ -3,7 +3,6 @@ package io.ebeaninternal.dbmigration.migration;
 import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;
 import javax.xml.bind.annotation.XmlAttribute;
-import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlType;
 import java.util.ArrayList;
@@ -12,13 +11,17 @@ import java.util.List;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>
  *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;sequence>
+ *         &lt;element name="before" type="{http://ebean-orm.github.io/xml/ns/dbmigration}ddl-script" maxOccurs="unbounded" minOccurs="0"/>
+ *         &lt;element name="after" type="{http://ebean-orm.github.io/xml/ns/dbmigration}ddl-script" maxOccurs="unbounded" minOccurs="0"/>
+ *       &lt;/sequence>
  *       &lt;attribute name="columnName" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
  *       &lt;attribute name="tableName" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
  *       &lt;attribute name="withHistory" type="{http://www.w3.org/2001/XMLSchema}boolean" />
@@ -50,16 +53,14 @@ import java.util.List;
  */
 @XmlAccessorType(XmlAccessType.FIELD)
 @XmlType(name = "", propOrder = {
-    "before", "after"
+  "before",
+  "after"
 })
 @XmlRootElement(name = "alterColumn")
 public class AlterColumn {
 
-  @XmlElement(required = false)
   protected List<DdlScript> before;
-  @XmlElement(required = false)
   protected List<DdlScript> after;
-
   @XmlAttribute(name = "columnName", required = true)
   protected String columnName;
   @XmlAttribute(name = "tableName", required = true)
@@ -109,6 +110,60 @@ public class AlterColumn {
   @XmlAttribute(name = "dropForeignKeyIndex")
   protected String dropForeignKeyIndex;
 
+  /**
+   * Gets the value of the before property.
+   *
+   * <p>
+   * This accessor method returns a reference to the live list,
+   * not a snapshot. Therefore any modification you make to the
+   * returned list will be present inside the JAXB object.
+   * This is why there is not a <CODE>set</CODE> method for the before property.
+   *
+   * <p>
+   * For example, to add a new item, do as follows:
+   * <pre>
+   *    getBefore().add(newItem);
+   * </pre>
+   *
+   *
+   * <p>
+   * Objects of the following type(s) are allowed in the list
+   * {@link DdlScript }
+   */
+  public List<DdlScript> getBefore() {
+    if (before == null) {
+      before = new ArrayList<>();
+    }
+    return this.before;
+  }
+
+  /**
+   * Gets the value of the after property.
+   *
+   * <p>
+   * This accessor method returns a reference to the live list,
+   * not a snapshot. Therefore any modification you make to the
+   * returned list will be present inside the JAXB object.
+   * This is why there is not a <CODE>set</CODE> method for the after property.
+   *
+   * <p>
+   * For example, to add a new item, do as follows:
+   * <pre>
+   *    getAfter().add(newItem);
+   * </pre>
+   *
+   *
+   * <p>
+   * Objects of the following type(s) are allowed in the list
+   * {@link DdlScript }
+   */
+  public List<DdlScript> getAfter() {
+    if (after == null) {
+      after = new ArrayList<>();
+    }
+    return this.after;
+  }
+
   /**
    * Gets the value of the columnName property.
    *
@@ -589,17 +644,4 @@ public class AlterColumn {
     this.dropForeignKeyIndex = value;
   }
 
-  public List<DdlScript> getBefore() {
-    if (before == null) {
-      before = new ArrayList<>();
-    }
-    return before;
-  }
-
-  public List<DdlScript> getAfter() {
-    if (after == null) {
-      after = new ArrayList<>();
-    }
-    return after;
-  }
 }

src/main/java/io/ebeaninternal/dbmigration/migration/AlterForeignKey.java

@@ -9,21 +9,34 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
- * TODO
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;attribute name="name" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="columnNames" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="refColumnNames" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="refTableName" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="indexName" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="tableName" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="onDelete" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="onUpdate" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
  * </pre>
  */
 @XmlAccessorType(XmlAccessType.FIELD)
 @XmlType(name = "")
-@XmlRootElement(name = "foreignKey")
+@XmlRootElement(name = "alterForeignKey")
 public class AlterForeignKey {
 
   @XmlAttribute(name = "name", required = true)
   protected String name;
-  @XmlAttribute(name = "columnNames", required = true)
+  @XmlAttribute(name = "columnNames")
   protected String columnNames;
   @XmlAttribute(name = "refColumnNames")
   protected String refColumnNames;
@@ -37,6 +50,7 @@ public class AlterForeignKey {
   protected String onDelete;
   @XmlAttribute(name = "onUpdate")
   protected String onUpdate;
+
   /**
    * Gets the value of the name property.
    *
@@ -196,4 +210,5 @@ public class AlterForeignKey {
   public void setOnUpdate(String value) {
     this.onUpdate = value;
   }
+
 }

src/main/java/io/ebeaninternal/dbmigration/migration/AlterHistoryTable.java

@@ -9,9 +9,9 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>

src/main/java/io/ebeaninternal/dbmigration/migration/Apply.java

@@ -9,9 +9,9 @@ import javax.xml.bind.annotation.XmlValue;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;simpleContent>

src/main/java/io/ebeaninternal/dbmigration/migration/ChangeSet.java

@@ -13,9 +13,9 @@ import java.util.List;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>
@@ -50,16 +50,16 @@ public class ChangeSet {
     @XmlElement(name = "dropTable", type = DropTable.class),
     @XmlElement(name = "renameTable", type = RenameTable.class),
     @XmlElement(name = "addTableComment", type = AddTableComment.class),
+    @XmlElement(name = "addUniqueConstraint", type = AddUniqueConstraint.class),
     @XmlElement(name = "addHistoryTable", type = AddHistoryTable.class),
     @XmlElement(name = "dropHistoryTable", type = DropHistoryTable.class),
+    @XmlElement(name = "alterForeignKey", type = AlterForeignKey.class),
     @XmlElement(name = "addColumn", type = AddColumn.class),
     @XmlElement(name = "dropColumn", type = DropColumn.class),
     @XmlElement(name = "alterColumn", type = AlterColumn.class),
     @XmlElement(name = "renameColumn", type = RenameColumn.class),
     @XmlElement(name = "createIndex", type = CreateIndex.class),
-    @XmlElement(name = "dropIndex", type = DropIndex.class),
-    @XmlElement(name = "addUniqueConstraint", type = AddUniqueConstraint.class),
-    @XmlElement(name = "alterForeignKey", type = AlterForeignKey.class),
+    @XmlElement(name = "dropIndex", type = DropIndex.class)
   })
   protected List<Object> changeSetChildren;
   @XmlAttribute(name = "type", required = true)
@@ -77,20 +77,20 @@ public class ChangeSet {
 
   /**
    * Gets the value of the changeSetChildren property.
-   * <p>
+   *
    * <p>
    * This accessor method returns a reference to the live list,
    * not a snapshot. Therefore any modification you make to the
    * returned list will be present inside the JAXB object.
    * This is why there is not a <CODE>set</CODE> method for the changeSetChildren property.
-   * <p>
+   *
    * <p>
    * For example, to add a new item, do as follows:
    * <pre>
    *    getChangeSetChildren().add(newItem);
    * </pre>
-   * <p>
-   * <p>
+   *
+   *
    * <p>
    * Objects of the following type(s) are allowed in the list
    * {@link Configuration }
@@ -99,8 +99,10 @@ public class ChangeSet {
    * {@link DropTable }
    * {@link RenameTable }
    * {@link AddTableComment }
+   * {@link AddUniqueConstraint }
    * {@link AddHistoryTable }
    * {@link DropHistoryTable }
+   * {@link AlterForeignKey }
    * {@link AddColumn }
    * {@link DropColumn }
    * {@link AlterColumn }

src/main/java/io/ebeaninternal/dbmigration/migration/ChangeSetType.java

@@ -7,7 +7,7 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for changeSetType.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
  * <p>
  * <pre>
@@ -16,6 +16,7 @@ import javax.xml.bind.annotation.XmlType;
  *     &lt;enumeration value="apply"/>
  *     &lt;enumeration value="pendingDrops"/>
  *     &lt;enumeration value="baseline"/>
+ *     &lt;enumeration value="drop"/>
  *   &lt;/restriction>
  * &lt;/simpleType>
  * </pre>
@@ -29,7 +30,9 @@ public enum ChangeSetType {
   @XmlEnumValue("pendingDrops")
   PENDING_DROPS("pendingDrops"),
   @XmlEnumValue("baseline")
-  BASELINE("baseline");
+  BASELINE("baseline"),
+  @XmlEnumValue("drop")
+  DROP("drop");
   private final String value;
 
   ChangeSetType(String v) {

src/main/java/io/ebeaninternal/dbmigration/migration/Column.java

@@ -3,7 +3,6 @@ package io.ebeaninternal.dbmigration.migration;
 import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;
 import javax.xml.bind.annotation.XmlAttribute;
-import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlType;
 import java.util.ArrayList;
@@ -12,13 +11,17 @@ import java.util.List;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>
  *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;sequence>
+ *         &lt;element name="before" type="{http://ebean-orm.github.io/xml/ns/dbmigration}ddl-script" maxOccurs="unbounded" minOccurs="0"/>
+ *         &lt;element name="after" type="{http://ebean-orm.github.io/xml/ns/dbmigration}ddl-script" maxOccurs="unbounded" minOccurs="0"/>
+ *       &lt;/sequence>
  *       &lt;attribute name="name" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
  *       &lt;attribute name="type" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
  *       &lt;attribute name="defaultValue" type="{http://www.w3.org/2001/XMLSchema}string" />
@@ -43,16 +46,14 @@ import java.util.List;
  */
 @XmlAccessorType(XmlAccessType.FIELD)
 @XmlType(name = "", propOrder = {
-  "before", "after"
+  "before",
+  "after"
 })
 @XmlRootElement(name = "column")
 public class Column {
 
-  @XmlElement(required = false)
   protected List<DdlScript> before;
-  @XmlElement(required = false)
   protected List<DdlScript> after;
-
   @XmlAttribute(name = "name", required = true)
   protected String name;
   @XmlAttribute(name = "type", required = true)
@@ -88,19 +89,58 @@ public class Column {
   @XmlAttribute(name = "comment")
   protected String comment;
 
-
+  /**
+   * Gets the value of the before property.
+   *
+   * <p>
+   * This accessor method returns a reference to the live list,
+   * not a snapshot. Therefore any modification you make to the
+   * returned list will be present inside the JAXB object.
+   * This is why there is not a <CODE>set</CODE> method for the before property.
+   *
+   * <p>
+   * For example, to add a new item, do as follows:
+   * <pre>
+   *    getBefore().add(newItem);
+   * </pre>
+   *
+   *
+   * <p>
+   * Objects of the following type(s) are allowed in the list
+   * {@link DdlScript }
+   */
   public List<DdlScript> getBefore() {
     if (before == null) {
       before = new ArrayList<>();
     }
-    return before;
+    return this.before;
   }
 
+  /**
+   * Gets the value of the after property.
+   *
+   * <p>
+   * This accessor method returns a reference to the live list,
+   * not a snapshot. Therefore any modification you make to the
+   * returned list will be present inside the JAXB object.
+   * This is why there is not a <CODE>set</CODE> method for the after property.
+   *
+   * <p>
+   * For example, to add a new item, do as follows:
+   * <pre>
+   *    getAfter().add(newItem);
+   * </pre>
+   *
+   *
+   * <p>
+   * Objects of the following type(s) are allowed in the list
+   * {@link DdlScript }
+   */
   public List<DdlScript> getAfter() {
     if (after == null) {
       after = new ArrayList<>();
     }
-    return after;
+    return this.after;
   }
 
   /**
@@ -384,7 +424,7 @@ public class Column {
   }
 
   /**
-   * Gets the value of the foreignOnDelete property.
+   * Gets the value of the foreignKeyOnDelete property.
    *
    * @return possible object is
    * {@link String }
@@ -404,7 +444,7 @@ public class Column {
   }
 
   /**
-   * Gets the value of the foreignOnUpdate property.
+   * Gets the value of the foreignKeyOnUpdate property.
    *
    * @return possible object is
    * {@link String }

src/main/java/io/ebeaninternal/dbmigration/migration/Configuration.java

@@ -9,9 +9,9 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>

src/main/java/io/ebeaninternal/dbmigration/migration/CreateIndex.java

@@ -9,9 +9,9 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>

src/main/java/io/ebeaninternal/dbmigration/migration/CreateTable.java

@@ -14,9 +14,9 @@ import java.util.List;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>
@@ -28,6 +28,8 @@ import java.util.List;
  *       &lt;/sequence>
  *       &lt;attGroup ref="{http://ebean-orm.github.io/xml/ns/dbmigration}tablespaceAttributes"/>
  *       &lt;attribute name="name" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="partitionMode" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="partitionColumn" type="{http://www.w3.org/2001/XMLSchema}string" />
  *       &lt;attribute name="withHistory" type="{http://www.w3.org/2001/XMLSchema}boolean" />
  *       &lt;attribute name="draft" type="{http://www.w3.org/2001/XMLSchema}boolean" />
  *       &lt;attribute name="identityType" type="{http://ebean-orm.github.io/xml/ns/dbmigration}identityType" />
@@ -55,6 +57,10 @@ public class CreateTable {
   protected List<ForeignKey> foreignKey;
   @XmlAttribute(name = "name", required = true)
   protected String name;
+  @XmlAttribute(name = "partitionMode")
+  protected String partitionMode;
+  @XmlAttribute(name = "partitionColumn")
+  protected String partitionColumn;
   @XmlAttribute(name = "withHistory")
   protected Boolean withHistory;
   @XmlAttribute(name = "draft")
@@ -80,20 +86,20 @@ public class CreateTable {
 
   /**
    * Gets the value of the column property.
-   * <p>
+   *
    * <p>
    * This accessor method returns a reference to the live list,
    * not a snapshot. Therefore any modification you make to the
    * returned list will be present inside the JAXB object.
    * This is why there is not a <CODE>set</CODE> method for the column property.
-   * <p>
+   *
    * <p>
    * For example, to add a new item, do as follows:
    * <pre>
    *    getColumn().add(newItem);
    * </pre>
-   * <p>
-   * <p>
+   *
+   *
    * <p>
    * Objects of the following type(s) are allowed in the list
    * {@link Column }
@@ -107,20 +113,20 @@ public class CreateTable {
 
   /**
    * Gets the value of the uniqueConstraint property.
-   * <p>
+   *
    * <p>
    * This accessor method returns a reference to the live list,
    * not a snapshot. Therefore any modification you make to the
    * returned list will be present inside the JAXB object.
    * This is why there is not a <CODE>set</CODE> method for the uniqueConstraint property.
-   * <p>
+   *
    * <p>
    * For example, to add a new item, do as follows:
    * <pre>
    *    getUniqueConstraint().add(newItem);
    * </pre>
-   * <p>
-   * <p>
+   *
+   *
    * <p>
    * Objects of the following type(s) are allowed in the list
    * {@link UniqueConstraint }
@@ -134,20 +140,20 @@ public class CreateTable {
 
   /**
    * Gets the value of the foreignKey property.
-   * <p>
+   *
    * <p>
    * This accessor method returns a reference to the live list,
    * not a snapshot. Therefore any modification you make to the
    * returned list will be present inside the JAXB object.
    * This is why there is not a <CODE>set</CODE> method for the foreignKey property.
-   * <p>
+   *
    * <p>
    * For example, to add a new item, do as follows:
    * <pre>
    *    getForeignKey().add(newItem);
    * </pre>
-   * <p>
-   * <p>
+   *
+   *
    * <p>
    * Objects of the following type(s) are allowed in the list
    * {@link ForeignKey }
@@ -179,6 +185,46 @@ public class CreateTable {
     this.name = value;
   }
 
+  /**
+   * Gets the value of the partitionMode property.
+   *
+   * @return possible object is
+   * {@link String }
+   */
+  public String getPartitionMode() {
+    return partitionMode;
+  }
+
+  /**
+   * Sets the value of the partitionMode property.
+   *
+   * @param value allowed object is
+   *              {@link String }
+   */
+  public void setPartitionMode(String value) {
+    this.partitionMode = value;
+  }
+
+  /**
+   * Gets the value of the partitionColumn property.
+   *
+   * @return possible object is
+   * {@link String }
+   */
+  public String getPartitionColumn() {
+    return partitionColumn;
+  }
+
+  /**
+   * Sets the value of the partitionColumn property.
+   *
+   * @param value allowed object is
+   *              {@link String }
+   */
+  public void setPartitionColumn(String value) {
+    this.partitionColumn = value;
+  }
+
   /**
    * Gets the value of the withHistory property.
    *

src/main/java/io/ebeaninternal/dbmigration/migration/DdlScript.java

@@ -1,42 +1,61 @@
 package io.ebeaninternal.dbmigration.migration;
 
-import java.util.ArrayList;
-import java.util.List;
-
 import javax.xml.bind.annotation.XmlAccessType;
 import javax.xml.bind.annotation.XmlAccessorType;
 import javax.xml.bind.annotation.XmlAttribute;
-import javax.xml.bind.annotation.XmlRootElement;
+import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlType;
-import javax.xml.bind.annotation.XmlValue;
+import java.util.ArrayList;
+import java.util.List;
 
 
 /**
- * <p>Java class for anonymous complex type.
- * <p>
+ * <p>Java class for ddl-script complex type.
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
- * TODO @Rob: Can this generated automatically?
+ * &lt;complexType name="ddl-script">
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;sequence>
+ *         &lt;element name="ddl" type="{http://www.w3.org/2001/XMLSchema}string" maxOccurs="unbounded"/>
+ *       &lt;/sequence>
+ *       &lt;attribute name="platforms" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
  * </pre>
  */
 @XmlAccessorType(XmlAccessType.FIELD)
-@XmlType(name = "", propOrder = {
+@XmlType(name = "ddl-script", propOrder = {
   "ddl"
 })
-@XmlRootElement(name = "ddl-script")
 public class DdlScript {
 
-  @XmlValue
+  @XmlElement(required = true)
   protected List<String> ddl;
-
   @XmlAttribute(name = "platforms")
   protected String platforms;
 
   /**
-   * Gets the value of the value property.
+   * Gets the value of the ddl property.
    *
-   * @return possible object is
+   * <p>
+   * This accessor method returns a reference to the live list,
+   * not a snapshot. Therefore any modification you make to the
+   * returned list will be present inside the JAXB object.
+   * This is why there is not a <CODE>set</CODE> method for the ddl property.
+   *
+   * <p>
+   * For example, to add a new item, do as follows:
+   * <pre>
+   *    getDdl().add(newItem);
+   * </pre>
+   *
+   *
+   * <p>
+   * Objects of the following type(s) are allowed in the list
    * {@link String }
    */
   public List<String> getDdl() {

src/main/java/io/ebeaninternal/dbmigration/migration/DefaultTablespace.java

@@ -9,9 +9,9 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>

src/main/java/io/ebeaninternal/dbmigration/migration/DropColumn.java

@@ -9,9 +9,9 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>

src/main/java/io/ebeaninternal/dbmigration/migration/DropHistoryTable.java

@@ -9,9 +9,9 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>

src/main/java/io/ebeaninternal/dbmigration/migration/DropIndex.java

@@ -9,9 +9,9 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>

src/main/java/io/ebeaninternal/dbmigration/migration/DropTable.java

@@ -9,14 +9,16 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>
  *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
  *       &lt;attribute name="name" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="sequenceCol" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="sequenceName" type="{http://www.w3.org/2001/XMLSchema}string" />
  *     &lt;/restriction>
  *   &lt;/complexContent>
  * &lt;/complexType>
@@ -64,16 +66,6 @@ public class DropTable {
     return sequenceCol;
   }
 
-  /**
-   * Gets the value of the sequenceName property.
-   *
-   * @return possible object is
-   * {@link String }
-   */
-  public String getSequenceName() {
-    return sequenceName;
-  }
-
   /**
    * Sets the value of the sequenceCol property.
    *
@@ -84,6 +76,16 @@ public class DropTable {
     this.sequenceCol = value;
   }
 
+  /**
+   * Gets the value of the sequenceName property.
+   *
+   * @return possible object is
+   * {@link String }
+   */
+  public String getSequenceName() {
+    return sequenceName;
+  }
+
   /**
    * Sets the value of the sequenceName property.
    *

src/main/java/io/ebeaninternal/dbmigration/migration/ForeignKey.java

@@ -9,9 +9,9 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>
@@ -47,6 +47,7 @@ public class ForeignKey {
   protected String onDelete;
   @XmlAttribute(name = "onUpdate")
   protected String onUpdate;
+
   /**
    * Gets the value of the name property.
    *

src/main/java/io/ebeaninternal/dbmigration/migration/IdentityType.java

@@ -7,7 +7,7 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for identityType.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
  * <p>
  * <pre>

src/main/java/io/ebeaninternal/dbmigration/migration/Migration.java

@@ -11,9 +11,9 @@ import java.util.List;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>
@@ -38,20 +38,20 @@ public class Migration {
 
   /**
    * Gets the value of the changeSet property.
-   * <p>
+   *
    * <p>
    * This accessor method returns a reference to the live list,
    * not a snapshot. Therefore any modification you make to the
    * returned list will be present inside the JAXB object.
    * This is why there is not a <CODE>set</CODE> method for the changeSet property.
-   * <p>
+   *
    * <p>
    * For example, to add a new item, do as follows:
    * <pre>
    *    getChangeSet().add(newItem);
    * </pre>
-   * <p>
-   * <p>
+   *
+   *
    * <p>
    * Objects of the following type(s) are allowed in the list
    * {@link ChangeSet }

src/main/java/io/ebeaninternal/dbmigration/migration/ObjectFactory.java

@@ -6,7 +6,7 @@ import javax.xml.bind.annotation.XmlRegistry;
 /**
  * This object contains factory methods for each
  * Java content interface and Java element interface
- * generated in the io.ebean.dbmigration.migration package.
+ * generated in the io.ebeaninternal.dbmigration.migration package.
  * <p>An ObjectFactory allows you to programatically
  * construct new instances of the Java representation
  * for XML content. The Java representation of XML
@@ -21,23 +21,23 @@ public class ObjectFactory {
 
 
   /**
-   * Create a new ObjectFactory that can be used to create new instances of schema derived classes for package: io.ebean.dbmigration.migration
+   * Create a new ObjectFactory that can be used to create new instances of schema derived classes for package: io.ebeaninternal.dbmigration.migration
    */
   public ObjectFactory() {
   }
 
   /**
-   * Create an instance of {@link Rollback }
+   * Create an instance of {@link AddUniqueConstraint }
    */
-  public Rollback createRollback() {
-    return new Rollback();
+  public AddUniqueConstraint createAddUniqueConstraint() {
+    return new AddUniqueConstraint();
   }
 
   /**
-   * Create an instance of {@link AddColumn }
+   * Create an instance of {@link CreateTable }
    */
-  public AddColumn createAddColumn() {
-    return new AddColumn();
+  public CreateTable createCreateTable() {
+    return new CreateTable();
   }
 
   /**
@@ -48,10 +48,10 @@ public class ObjectFactory {
   }
 
   /**
-   * Create an instance of {@link CreateTable }
+   * Create an instance of {@link DdlScript }
    */
-  public CreateTable createCreateTable() {
-    return new CreateTable();
+  public DdlScript createDdlScript() {
+    return new DdlScript();
   }
 
   /**
@@ -68,13 +68,6 @@ public class ObjectFactory {
     return new ForeignKey();
   }
 
-  /**
-   * Create an instance of {@link Apply }
-   */
-  public Apply createApply() {
-    return new Apply();
-  }
-
   /**
    * Create an instance of {@link Configuration }
    */
@@ -89,13 +82,6 @@ public class ObjectFactory {
     return new DefaultTablespace();
   }
 
-  /**
-   * Create an instance of {@link AddTableComment }
-   */
-  public AddTableComment createAddTableComment() {
-    return new AddTableComment();
-  }
-
   /**
    * Create an instance of {@link RenameTable }
    */
@@ -111,10 +97,10 @@ public class ObjectFactory {
   }
 
   /**
-   * Create an instance of {@link AlterColumn }
+   * Create an instance of {@link AlterForeignKey }
    */
-  public AlterColumn createAlterColumn() {
-    return new AlterColumn();
+  public AlterForeignKey createAlterForeignKey() {
+    return new AlterForeignKey();
   }
 
   /**
@@ -124,6 +110,69 @@ public class ObjectFactory {
     return new DropColumn();
   }
 
+  /**
+   * Create an instance of {@link Sql }
+   */
+  public Sql createSql() {
+    return new Sql();
+  }
+
+  /**
+   * Create an instance of {@link Apply }
+   */
+  public Apply createApply() {
+    return new Apply();
+  }
+
+  /**
+   * Create an instance of {@link Rollback }
+   */
+  public Rollback createRollback() {
+    return new Rollback();
+  }
+
+  /**
+   * Create an instance of {@link DropIndex }
+   */
+  public DropIndex createDropIndex() {
+    return new DropIndex();
+  }
+
+  /**
+   * Create an instance of {@link RenameColumn }
+   */
+  public RenameColumn createRenameColumn() {
+    return new RenameColumn();
+  }
+
+  /**
+   * Create an instance of {@link DropTable }
+   */
+  public DropTable createDropTable() {
+    return new DropTable();
+  }
+
+  /**
+   * Create an instance of {@link AddColumn }
+   */
+  public AddColumn createAddColumn() {
+    return new AddColumn();
+  }
+
+  /**
+   * Create an instance of {@link AddTableComment }
+   */
+  public AddTableComment createAddTableComment() {
+    return new AddTableComment();
+  }
+
+  /**
+   * Create an instance of {@link AlterColumn }
+   */
+  public AlterColumn createAlterColumn() {
+    return new AlterColumn();
+  }
+
   /**
    * Create an instance of {@link CreateIndex }
    */
@@ -138,20 +187,6 @@ public class ObjectFactory {
     return new ChangeSet();
   }
 
-  /**
-   * Create an instance of {@link Sql }
-   */
-  public Sql createSql() {
-    return new Sql();
-  }
-
-  /**
-   * Create an instance of {@link DropTable }
-   */
-  public DropTable createDropTable() {
-    return new DropTable();
-  }
-
   /**
    * Create an instance of {@link AddHistoryTable }
    */
@@ -159,20 +194,6 @@ public class ObjectFactory {
     return new AddHistoryTable();
   }
 
-  /**
-   * Create an instance of {@link RenameColumn }
-   */
-  public RenameColumn createRenameColumn() {
-    return new RenameColumn();
-  }
-
-  /**
-   * Create an instance of {@link DropIndex }
-   */
-  public DropIndex createDropIndex() {
-    return new DropIndex();
-  }
-
   /**
    * Create an instance of {@link AlterHistoryTable }
    */
@@ -187,24 +208,4 @@ public class ObjectFactory {
     return new Migration();
   }
 
-  /**
-   * Create an instance of {@link DdlScript }
-   */
-  public DdlScript createDdlScript() {
-    return new DdlScript();
-  }
-
-  /**
-   * Create an instance of {@link AddUniqueConstraint }
-   */
-  public AddUniqueConstraint createAddUniqueConstraint() {
-    return new AddUniqueConstraint();
-  }
-
-  /**
-   * Create an instance of {@link AddUniqueConstraint }
-   */
-  public AlterForeignKey createAlterForeignKey() {
-    return new AlterForeignKey();
-  }
 }

src/main/java/io/ebeaninternal/dbmigration/migration/RenameColumn.java

@@ -9,9 +9,9 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>

src/main/java/io/ebeaninternal/dbmigration/migration/RenameTable.java

@@ -9,9 +9,9 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>

src/main/java/io/ebeaninternal/dbmigration/migration/Rollback.java

@@ -9,9 +9,9 @@ import javax.xml.bind.annotation.XmlValue;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;simpleContent>

src/main/java/io/ebeaninternal/dbmigration/migration/Sql.java

@@ -9,9 +9,9 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>

src/main/java/io/ebeaninternal/dbmigration/migration/UniqueConstraint.java

@@ -9,15 +9,17 @@ import javax.xml.bind.annotation.XmlType;
 
 /**
  * <p>Java class for anonymous complex type.
- * <p>
+ *
  * <p>The following schema fragment specifies the expected content contained within this class.
- * <p>
+ *
  * <pre>
  * &lt;complexType>
  *   &lt;complexContent>
  *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
  *       &lt;attribute name="name" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
  *       &lt;attribute name="columnNames" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="oneToOne" type="{http://www.w3.org/2001/XMLSchema}boolean" />
+ *       &lt;attribute name="nullableColumns" type="{http://www.w3.org/2001/XMLSchema}string" />
  *     &lt;/restriction>
  *   &lt;/complexContent>
  * &lt;/complexType>
@@ -30,16 +32,13 @@ public class UniqueConstraint {
 
   @XmlAttribute(name = "name", required = true)
   protected String name;
-
   @XmlAttribute(name = "columnNames", required = true)
   protected String columnNames;
-
-  @XmlAttribute(name = "oneToOne", required = false)
+  @XmlAttribute(name = "oneToOne")
   protected Boolean oneToOne;
-
-  @XmlAttribute(name = "nullableColumns", required = true)
+  @XmlAttribute(name = "nullableColumns")
   protected String nullableColumns;
-  
+
   /**
    * Gets the value of the name property.
    *
@@ -79,23 +78,25 @@ public class UniqueConstraint {
   public void setColumnNames(String value) {
     this.columnNames = value;
   }
-  
+
   /**
    * Gets the value of the oneToOne property.
    *
-   * @return true if oneToOne was set
+   * @return possible object is
+   * {@link Boolean }
    */
-  public boolean isOneToOne() {
-    return Boolean.TRUE.equals(oneToOne);
+  public Boolean isOneToOne() {
+    return oneToOne;
   }
-  
+
   /**
    * Sets the value of the oneToOne property.
    *
-   * @param value boolean
+   * @param value allowed object is
+   *              {@link Boolean }
    */
-  public void setOneToOne(boolean oneToOne) {
-    this.oneToOne = oneToOne;
+  public void setOneToOne(Boolean value) {
+    this.oneToOne = value;
   }
 
   /**

src/main/java/io/ebeaninternal/dbmigration/model/CurrentModel.java

@@ -9,8 +9,12 @@ import io.ebeaninternal.dbmigration.migration.ChangeSet;
 import io.ebeaninternal.dbmigration.model.build.ModelBuildBeanVisitor;
 import io.ebeaninternal.dbmigration.model.build.ModelBuildContext;
 import io.ebeaninternal.dbmigration.model.visitor.VisitAllUsing;
+import io.ebeaninternal.extraddl.model.DdlScript;
+import io.ebeaninternal.extraddl.model.ExtraDdl;
+import io.ebeaninternal.extraddl.model.ExtraDdlXmlReader;
 
 import java.io.IOException;
+import java.util.List;
 
 /**
  * Reads EbeanServer bean descriptors to build the current model.
@@ -25,6 +29,8 @@ public class CurrentModel {
 
   private final boolean platformTypes;
 
+  private final boolean jaxbPresent;
+
   private ModelContainer model;
 
   private ChangeSet changeSet;
@@ -54,6 +60,21 @@ public class CurrentModel {
     this.constraintNaming = constraintNaming;
     this.maxLength = maxLength(server, constraintNaming);
     this.platformTypes = platformTypes;
+    this.jaxbPresent = server.getServerConfig().getClassLoadConfig().isJavaxJAXBPresent();
+  }
+
+  /**
+   * Return true if the model contains tables that are partitioned.
+   */
+  public boolean isTablePartitioning() {
+    return model.isTablePartitioning();
+  }
+
+  /**
+   * Return the tables that have partitioning.
+   */
+  public List<MTable> getPartitionedTables() {
+    return model.getPartitionedTables();
   }
 
   private static DbConstraintNaming.MaxLength maxLength(SpiEbeanServer server, DbConstraintNaming naming) {
@@ -111,6 +132,11 @@ public class CurrentModel {
     if (header != null && !header.isEmpty()) {
       ddl.append(header).append('\n');
     }
+
+    if (jaxbPresent) {
+      addExtraDdl(ddl, ExtraDdlXmlReader.readBuiltin(), "-- init script ");
+    }
+
     ddl.append(write.apply().getBuffer());
     ddl.append(write.applyForeignKeys().getBuffer());
     ddl.append(write.applyHistoryView().getBuffer());
@@ -119,6 +145,18 @@ public class CurrentModel {
     return ddl.toString();
   }
 
+  private void addExtraDdl(StringBuilder ddl, ExtraDdl extraDdl, String prefix) {
+    if (extraDdl != null) {
+      List<DdlScript> ddlScript = extraDdl.getDdlScript();
+      for (DdlScript script : ddlScript) {
+        if (script.isInit() && ExtraDdlXmlReader.matchPlatform(server.getDatabasePlatform().getName(), script.getPlatforms())) {
+          ddl.append(prefix + script.getName()).append('\n');
+          ddl.append(script.getValue());
+        }
+      }
+    }
+  }
+
   /**
    * Return the 'Drop' DDL.
    */

src/main/java/io/ebeaninternal/dbmigration/model/MCompoundUniqueConstraint.java

@@ -1,11 +1,12 @@
 package io.ebeaninternal.dbmigration.model;
 
-import java.util.Arrays;
-import java.util.Objects;
-
 import io.ebeaninternal.dbmigration.ddlgeneration.platform.DdlHelp;
 import io.ebeaninternal.dbmigration.migration.AddUniqueConstraint;
 import io.ebeaninternal.dbmigration.migration.UniqueConstraint;
+
+import java.util.Arrays;
+import java.util.Objects;
+
 /**
  * A unique constraint for multiple columns.
  * <p>
@@ -26,13 +27,13 @@ public class MCompoundUniqueConstraint {
    * The columns combined to be unique.
    */
   private final String[] columns;
-  
+
   private String[] nullableColumns;
 
-  public MCompoundUniqueConstraint(String[] columns, boolean oneToOne, String name) {
+  public MCompoundUniqueConstraint(String[] columns, Boolean oneToOne, String name) {
     this.name = name;
     this.columns = columns;
-    this.oneToOne = oneToOne;
+    this.oneToOne = Boolean.TRUE.equals(oneToOne);
   }
 
   /**
@@ -55,6 +56,7 @@ public class MCompoundUniqueConstraint {
   public String getName() {
     return name;
   }
+
   public UniqueConstraint getUniqueConstraint() {
     UniqueConstraint uq = new UniqueConstraint();
     uq.setName(getName());
@@ -63,6 +65,7 @@ public class MCompoundUniqueConstraint {
     uq.setOneToOne(isOneToOne());
     return uq;
   }
+
   /**
    * Return a AddUniqueConstraint migration for this constraint.
    */
@@ -87,7 +90,7 @@ public class MCompoundUniqueConstraint {
     dropUniqueConstraint.setNullableColumns(join(nullableColumns));
     return dropUniqueConstraint;
   }
-  
+
   public void setNullableColumns(String[] nullableColumns) {
     if (nullableColumns != null && nullableColumns.length == 0) {
       this.nullableColumns = null;
@@ -109,12 +112,12 @@ public class MCompoundUniqueConstraint {
     }
     return sb.toString();
   }
-  
+
   @Override
   public int hashCode() {
     return Arrays.hashCode(columns) + 31 * Objects.hash(name, oneToOne);
   }
-  
+
   @Override
   public boolean equals(Object obj) {
     if (obj == this) {
@@ -125,8 +128,8 @@ public class MCompoundUniqueConstraint {
     }
     MCompoundUniqueConstraint other = (MCompoundUniqueConstraint) obj;
     return Arrays.equals(columns, other.columns)
-        && Arrays.equals(nullableColumns, other.nullableColumns)
-        && Objects.equals(name, other.name)
-        && oneToOne == other.oneToOne;
+      && Arrays.equals(nullableColumns, other.nullableColumns)
+      && Objects.equals(name, other.name)
+      && oneToOne == other.oneToOne;
   }
 }

src/main/java/io/ebeaninternal/dbmigration/model/MTable.java

@@ -14,6 +14,7 @@ import io.ebeaninternal.dbmigration.migration.DropTable;
 import io.ebeaninternal.dbmigration.migration.ForeignKey;
 import io.ebeaninternal.dbmigration.migration.IdentityType;
 import io.ebeaninternal.dbmigration.migration.UniqueConstraint;
+import io.ebeaninternal.server.deploy.PartitionMeta;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -61,6 +62,8 @@ public class MTable {
    */
   private boolean draft;
 
+  private PartitionMeta partitionMeta;
+
   /**
    * Primary key name.
    */
@@ -237,6 +240,10 @@ public class MTable {
     createTable.setName(name);
     createTable.setPkName(pkName);
     createTable.setComment(comment);
+    if (partitionMeta != null) {
+      createTable.setPartitionMode(partitionMeta.getMode().name());
+      createTable.setPartitionColumn(partitionMeta.getProperty());
+    }
     createTable.setTablespace(tablespace);
     createTable.setIndexTablespace(indexTablespace);
     createTable.setSequenceName(sequenceName);
@@ -419,6 +426,20 @@ public class MTable {
     return draft;
   }
 
+  /**
+   * Return true if this table is partitioned.
+   */
+  public boolean isPartitioned() {
+    return partitionMeta != null;
+  }
+
+  /**
+   * Return the partition meta for this table.
+   */
+  public PartitionMeta getPartitionMeta() {
+    return partitionMeta;
+  }
+
   public void setPkName(String pkName) {
     this.pkName = pkName;
   }
@@ -531,6 +552,17 @@ public class MTable {
     return pk;
   }
 
+  /**
+   * Return the primary key column if it is a simple primary key.
+   */
+  public String singlePrimaryKey() {
+    List<MColumn> columns = primaryKeyColumns();
+    if (columns.size() == 1) {
+      return columns.get(0).getName();
+    }
+    return null;
+  }
+
   private void checkTableName(String tableName) {
     if (!name.equals(tableName)) {
       throw new IllegalArgumentException("addColumn tableName [" + tableName + "] does not match [" + name + "]");
@@ -745,4 +777,8 @@ public class MTable {
       compoundKey.setIndexName(null);
     }
   }
+
+  public void setPartitionMeta(PartitionMeta partitionMeta) {
+    this.partitionMeta = partitionMeta;
+  }
 }

src/main/java/io/ebeaninternal/dbmigration/model/MigrationModel.java

@@ -42,9 +42,10 @@ public class MigrationModel {
 
     // find all the migration xml files
     File[] xmlFiles = modelDirectory.listFiles(pathname -> pathname.getName().toLowerCase().endsWith(modelSuffix));
-
+    if (xmlFiles == null || xmlFiles.length == 0) {
+      return;
+    }
     List<MigrationResource> resources = new ArrayList<>(xmlFiles.length);
-
     for (File xmlFile : xmlFiles) {
       resources.add(new MigrationResource(xmlFile, createVersion(xmlFile)));
     }

src/main/java/io/ebeaninternal/dbmigration/model/ModelContainer.java

@@ -19,6 +19,7 @@ import io.ebeaninternal.dbmigration.migration.DropTable;
 import io.ebeaninternal.dbmigration.migration.Migration;
 import io.ebeaninternal.dbmigration.migration.Sql;
 
+import java.util.ArrayList;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
@@ -43,9 +44,25 @@ public class ModelContainer {
 
   private final PendingDrops pendingDrops = new PendingDrops();
 
+  private final List<MTable> partitionedTables = new ArrayList<>();
+
   public ModelContainer() {
   }
 
+  /**
+   * Return true if the model contains tables that are partitioned.
+   */
+  public boolean isTablePartitioning() {
+    return !partitionedTables.isEmpty();
+  }
+
+  /**
+   * Return the list of partitioned tables.
+   */
+  public List<MTable> getPartitionedTables() {
+    return partitionedTables;
+  }
+
   /**
    * Adjust the FK references on all the draft tables.
    */
@@ -167,13 +184,12 @@ public class ModelContainer {
   /**
    * Unset the withHistory flag on the associated base table.
    */
-  private void applyChange(DropHistoryTable change) {
+  protected void applyChange(DropHistoryTable change) {
 
     MTable table = tables.get(change.getBaseTable());
-    if (table == null) {
-      throw new IllegalStateException("Table [" + change.getBaseTable() + "] does not exist in model?");
+    if (table != null) {
+      table.setWithHistory(false);
     }
-    table.setWithHistory(false);
   }
 
   private void applyChange(AddUniqueConstraint change) {
@@ -224,19 +240,14 @@ public class ModelContainer {
     if (tables.containsKey(tableName)) {
       throw new IllegalStateException("Table [" + tableName + "] already exists in model?");
     }
-    MTable table = new MTable(createTable);
-    tables.put(tableName, table);
+    tables.put(tableName, new MTable(createTable));
   }
 
   /**
    * Apply a DropTable change to the model.
    */
   protected void applyChange(DropTable dropTable) {
-    String tableName = dropTable.getName();
-    if (!tables.containsKey(tableName)) {
-      throw new IllegalStateException("Table [" + tableName + "] does not exists in model?");
-    }
-    tables.remove(tableName);
+    tables.remove(dropTable.getName());
   }
 
   /**
@@ -247,22 +258,16 @@ public class ModelContainer {
     if (indexes.containsKey(indexName)) {
       throw new IllegalStateException("Index [" + indexName + "] already exists in model?");
     }
-    MIndex index = new MIndex(createIndex);
-    indexes.put(createIndex.getIndexName(), index);
+    indexes.put(createIndex.getIndexName(), new MIndex(createIndex));
   }
 
   /**
    * Apply a DropTable change to the model.
    */
   protected void applyChange(DropIndex dropIndex) {
-    String name = dropIndex.getIndexName();
-    if (!indexes.containsKey(name)) {
-      throw new IllegalStateException("Index [" + name + "] does not exist in model?");
-    }
-    indexes.remove(name);
+    indexes.remove(dropIndex.getIndexName());
   }
 
-
   /**
    * Apply a AddColumn change to the model.
    */
@@ -300,6 +305,9 @@ public class ModelContainer {
    * Add a table (typically from reading EbeanServer meta data).
    */
   public MTable addTable(MTable table) {
+    if (table.isPartitioned()) {
+      partitionedTables.add(table);
+    }
     return tables.put(table.getName(), table);
   }
 

src/main/java/io/ebeaninternal/dbmigration/model/build/ModelBuildBeanVisitor.java

@@ -36,6 +36,7 @@ public class ModelBuildBeanVisitor implements BeanVisitor {
     }
 
     MTable table = new MTable(descriptor.getBaseTable());
+    table.setPartitionMeta(descriptor.getPartitionMeta());
     table.setComment(descriptor.getDbComment());
     if (descriptor.isHistorySupport()) {
       table.setWithHistory(true);

src/main/java/io/ebeaninternal/dbmigration/model/build/ModelBuildElementTable.java

@@ -24,9 +24,6 @@ public class ModelBuildElementTable {
 
     VisitAllUsing.visitOne(targetDescriptor, new ModelBuildPropertyVisitor(ctx, table, targetDescriptor));
 
-    ctx.fkeyBuilder(table)
-      .addForeignKey(manyProp.getBeanDescriptor(), manyProp.getTableJoin(), true);
-
     ctx.addTable(table);
   }
 

src/main/java/io/ebeaninternal/dbmigration/model/build/ModelBuildPropertyVisitor.java

@@ -192,7 +192,7 @@ public class ModelBuildPropertyVisitor extends BaseTablePropertyVisitor {
       col.setDbMigrationInfos(p.getDbMigrationInfos());
       col.setDefaultValue(p.getDbColumnDefault());
       if (columns.length == 1) {
-        if (p.hasForeignKey()) {
+        if (p.hasForeignKey() && !importedProperty.getBeanDescriptor().suppressForeignKey()) {
           // single references column (put it on the column)
           String refTable = importedProperty.getBeanDescriptor().getBaseTable();
           if (refTable == null) {
@@ -251,19 +251,20 @@ public class ModelBuildPropertyVisitor extends BaseTablePropertyVisitor {
         col.setIdentity(true);
       }
       TableJoin primaryKeyJoin = p.getBeanDescriptor().getPrimaryKeyJoin();
-      if (primaryKeyJoin != null) {
+      if (primaryKeyJoin != null && !table.isPartitioned()) {
         TableJoinColumn[] columns = primaryKeyJoin.columns();
         col.setReferences(primaryKeyJoin.getTable() + "." + columns[0].getForeignDbColumn());
         col.setForeignKeyName(determineForeignKeyConstraintName(col.getName()));
       }
     } else {
       col.setDefaultValue(p.getDbColumnDefault());
-      col.setDbMigrationInfos(p.getDbMigrationInfos());
       if (!p.isNullable() || p.isDDLNotNull()) {
         col.setNotnull(true);
       }
     }
 
+    col.setDbMigrationInfos(p.getDbMigrationInfos());
+
     if (p.isUnique() && !p.isId()) {
       col.setUnique(determineUniqueConstraintName(col.getName()));
       indexSetAdd(col.getName());

src/main/java/io/ebeaninternal/dbmigration/model/visitor/VisitAllUsing.java

@@ -133,8 +133,7 @@ public class VisitAllUsing {
     InheritInfo inheritInfo = descriptor.getInheritInfo();
     if (inheritInfo != null && inheritInfo.isRoot()) {
       // add all properties on the children objects
-      InheritChildVisitor childVisitor = new InheritChildVisitor(this, pv);
-      inheritInfo.visitChildren(childVisitor);
+      inheritInfo.visitChildren(new InheritChildVisitor(this, pv));
     }
   }
 
@@ -155,9 +154,10 @@ public class VisitAllUsing {
 
     @Override
     public void visit(InheritInfo inheritInfo) {
-      BeanProperty[] propertiesLocal = inheritInfo.desc().propertiesLocal();
-      for (BeanProperty aPropertiesLocal : propertiesLocal) {
-        owner.visit(pv, aPropertiesLocal);
+      for (BeanProperty beanProperty : inheritInfo.desc().propertiesLocal()) {
+        if (beanProperty.isDDLColumn()) {
+          owner.visit(pv, beanProperty);
+        }
       }
     }
   }

src/main/java/io/ebeaninternal/extraddl/model/DdlScript.java

@@ -39,7 +39,8 @@ public class DdlScript {
   protected String platforms;
   @XmlAttribute(name = "drop")
   protected boolean drop;
-
+  @XmlAttribute(name = "init")
+  protected boolean init;
   /**
    * Gets the value of the value property.
    *
@@ -114,4 +115,17 @@ public class DdlScript {
     this.drop = drop;
   }
 
+  /**
+   * Return if this a init script.
+   */
+  public boolean isInit() {
+    return init;
+  }
+
+  /**
+   * Sets that this is a init script.
+   */
+  public void setInit(boolean init) {
+    this.init = init;
+  }
 }

src/main/java/io/ebeaninternal/extraddl/model/ExtraDdlXmlReader.java

@@ -26,9 +26,22 @@ public class ExtraDdlXmlReader {
   public static String buildExtra(String platformName, boolean drops) {
 
     ExtraDdl read = ExtraDdlXmlReader.read("/extra-ddl.xml");
+    return buildExtra(platformName, drops, read);
+  }
+
+  /**
+   * Return any extra DDL for supporting partitioning given the database platform.
+   */
+  public static String buildPartitioning(String platformName) {
+    return buildExtra(platformName, false, readBuiltinTablePartitioning());
+  }
+
+  private static String buildExtra(String platformName, boolean drops, ExtraDdl read) {
+
     if (read == null) {
       return null;
     }
+
     StringBuilder sb = new StringBuilder(300);
     for (DdlScript script : read.getDdlScript()) {
       if (script.isDrop() == drops && matchPlatform(platformName, script.getPlatforms())) {
@@ -83,10 +96,31 @@ public class ExtraDdlXmlReader {
     }
   }
 
+  /**
+   * Read the builtin extra ddl. (Stored procedures, tvp types etc)
+   */
+  public static ExtraDdl readBuiltin() {
+    return read("/io/ebeaninternal/dbmigration/builtin-extra-ddl.xml");
+  }
+
+  /**
+   * Read the builtin extra ddl to support table partitioning.
+   */
+  public static ExtraDdl readBuiltinTablePartitioning() {
+    return read("/io/ebeaninternal/dbmigration/builtin-extra-ddl-partitioning.xml");
+  }
+
+  /**
+   * Read the extra ddl.
+   */
+  public static ExtraDdl read() {
+    return read("/extra-ddl.xml");
+  }
+
   /**
    * Read and return a ExtraDdl from an xml document at the given resource path.
    */
-  public static ExtraDdl read(String resourcePath) {
+  private static ExtraDdl read(String resourcePath) {
 
     try (InputStream is = ExtraDdlXmlReader.class.getResourceAsStream(resourcePath)) {
       if (is == null) {

src/main/java/io/ebeaninternal/server/cache/CachedBeanDataFromBean.java

@@ -66,7 +66,7 @@ public class CachedBeanDataFromBean {
       Object v = aPropertiesNonTransient.getValue(bean);
       aPropertiesNonTransient.setValue(sharableBean, v);
     }
-    EntityBeanIntercept intercept = sharableBean._ebean_intercept();
+    EntityBeanIntercept intercept = sharableBean._ebean_getIntercept();
     intercept.setReadOnly(true);
     intercept.setLoaded();
     return sharableBean;

src/main/java/io/ebeaninternal/server/cache/DefaultServerQueryCache.java

@@ -19,6 +19,7 @@ public class DefaultServerQueryCache extends DefaultServerCache {
     this.queryCacheEntryValidate = config.getQueryCacheEntryValidate();
   }
 
+  @Override
   protected Object unwrapEntry(CacheEntry entry) {
     return ((QueryCacheEntry) entry.getValue()).getValue();
   }

src/main/java/io/ebeaninternal/server/cluster/ClusterManager.java

@@ -59,6 +59,7 @@ public class ClusterManager implements ServerLookup {
     }
   }
 
+  @Override
   public EbeanServer getServer(String name) {
     synchronized (monitor) {
       return serverMap.get(name);