DB migration initial

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

@@ -7,6 +7,7 @@ import javax.sql.DataSource;
 import com.avaje.ebean.BackgroundExecutor;
 import com.avaje.ebean.Query;
 
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.PlatformDdl;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -145,6 +146,8 @@ public class DatabasePlatform {
    */
   protected boolean disallowBatchOnCascade;
 
+  protected PlatformDdl platformDdl;
+
   /**
    * Instantiates a new database platform.
    */
@@ -164,6 +167,10 @@ public class DatabasePlatform {
     return name;
   }
 
+  public PlatformDdl getPlatformDdl() {
+    return platformDdl;
+  }
+
   /**
    * Return true if the JDBC driver does not allow additional queries to execute
    * when a resultSet is being 'streamed' as is the case with findEach() etc.

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

@@ -1,6 +1,7 @@
 package com.avaje.ebean.config.dbplatform;
 
 import com.avaje.ebean.BackgroundExecutor;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.H2Ddl;
 
 import javax.sql.DataSource;
 
@@ -12,6 +13,7 @@ public class H2Platform extends DatabasePlatform {
   public H2Platform() {
     super();
     this.name = "h2";
+    this.platformDdl = new H2Ddl(this.dbTypeMap);
     this.dbEncrypt = new H2DbEncrypt();
     // like ? escape'' not working in the latest version H2 so just using no
     // escape clause for now noting that backslash is an escape char for like in H2

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

@@ -1,6 +1,8 @@
 package com.avaje.ebean.config.dbplatform;
 
 import com.avaje.ebean.BackgroundExecutor;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.H2Ddl;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.PostgresDdl;
 
 import javax.sql.DataSource;
 import java.sql.Types;
@@ -16,6 +18,8 @@ public class PostgresPlatform extends DatabasePlatform {
   public PostgresPlatform() {
     super();
     this.name = "postgres";
+    this.platformDdl = new PostgresDdl(this.dbTypeMap);
+
     // OnQueryOnly.CLOSE as a performance optimisation on Postgres
     this.onQueryOnly = OnQueryOnly.CLOSE;
     this.likeClause = "like ? escape''";

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

@@ -0,0 +1,59 @@
+package com.avaje.ebean.dbmigration.ddlgeneration;
+
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.BaseColumnDdl;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.BaseTableDdl;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.DdlNamingConvention;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.PlatformDdl;
+import com.avaje.ebean.dbmigration.migration.AddColumn;
+import com.avaje.ebean.dbmigration.migration.ChangeSet;
+import com.avaje.ebean.dbmigration.migration.CreateTable;
+import com.avaje.ebean.dbmigration.migration.DropColumn;
+
+import java.io.IOException;
+import java.util.List;
+
+/**
+ *
+ */
+public class BaseDdlHandler implements DdlHandler {
+
+  protected final ColumnDdl columnDdl;
+
+  protected final TableDdl tableDdl;
+
+  public BaseDdlHandler(DdlNamingConvention namingConvention, PlatformDdl platformDdl) {
+    this.tableDdl = new BaseTableDdl(namingConvention, platformDdl);
+    this.columnDdl = new BaseColumnDdl();
+  }
+
+  @Override
+  public void generate(DdlWrite writer, ChangeSet changeSet) throws IOException {
+
+    List<Object> changeSetChildren = changeSet.getChangeSetChildren();
+    for (Object change : changeSetChildren) {
+      if (change instanceof  CreateTable) {
+        generate(writer, (CreateTable) change);
+      } else if (change instanceof AddColumn) {
+        generate(writer, (AddColumn) change);
+      } else if (change instanceof DropColumn) {
+        generate(writer, (DropColumn) change);
+      }
+    }
+  }
+
+  @Override
+  public void generate(DdlWrite writer, CreateTable createTable) throws IOException {
+    tableDdl.generate(writer, createTable);
+  }
+
+  @Override
+  public void generate(DdlWrite writer, AddColumn addColumn) throws IOException {
+    columnDdl.generate(writer, addColumn);
+  }
+
+  @Override
+  public void generate(DdlWrite writer, DropColumn dropColumn) throws IOException {
+    columnDdl.generate(writer, dropColumn);
+  }
+
+}

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

@@ -0,0 +1,23 @@
+package com.avaje.ebean.dbmigration.ddlgeneration;
+
+import com.avaje.ebean.dbmigration.migration.AddColumn;
+import com.avaje.ebean.dbmigration.migration.DropColumn;
+
+import java.io.IOException;
+
+/**
+ * Write AddColumn or DropColumn.
+ */
+public interface ColumnDdl {
+
+  /**
+   * Write a AddColumn change.
+   */
+  void generate(DdlWrite writer, AddColumn addColumn) throws IOException;
+
+  /**
+   * Write a DropColumn change.
+   */
+  void generate(DdlWrite writer, DropColumn dropColumn) throws IOException;
+
+}

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

@@ -0,0 +1,52 @@
+package com.avaje.ebean.dbmigration.ddlgeneration;
+
+import com.avaje.ebean.dbmigration.model.MConfiguration;
+
+import java.io.IOException;
+
+/**
+ * Buffer to append generated DDL to.
+ */
+public interface DdlBuffer {
+
+  /**
+   * Return the configuration (default tablespaces etc).
+   */
+  MConfiguration getConfiguration();
+
+  /**
+   * Append DDL content to the buffer.
+   */
+  DdlBuffer append(String content) throws IOException;
+
+  /**
+   * Append DDL content to the buffer with space padding.
+   */
+  DdlBuffer append(String type, int space) throws IOException;
+
+  /**
+   * Append a value that is potentially null or empty and proceed it with a space if so.
+   */
+  DdlBuffer appendWithSpace(String foreignKeyRestrict) throws IOException;
+
+  /**
+   * Append new line character to the buffer.
+   */
+  DdlBuffer newLine() throws IOException;
+
+  /**
+   * Append the end of statement content.
+   */
+  DdlBuffer endOfStatement() throws IOException;
+
+  /**
+   * End of a change - add some whitespace.
+   */
+  DdlBuffer end() throws IOException;
+
+  /**
+   * Return the buffer content.
+   */
+  String getBuffer();
+
+}

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

@@ -0,0 +1,21 @@
+package com.avaje.ebean.dbmigration.ddlgeneration;
+
+import com.avaje.ebean.dbmigration.migration.AddColumn;
+import com.avaje.ebean.dbmigration.migration.ChangeSet;
+import com.avaje.ebean.dbmigration.migration.CreateTable;
+import com.avaje.ebean.dbmigration.migration.DropColumn;
+
+import java.io.IOException;
+
+/**
+ */
+public interface DdlHandler {
+
+  void generate(DdlWrite writer, ChangeSet changeSet) throws IOException;
+
+  void generate(DdlWrite writer, CreateTable createTable) throws IOException;
+
+  void generate(DdlWrite writer, AddColumn addColumn) throws IOException;
+
+  void generate(DdlWrite writer, DropColumn dropColumn) throws IOException;
+}

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

@@ -0,0 +1,97 @@
+package com.avaje.ebean.dbmigration.ddlgeneration;
+
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.BaseDdlBuffer;
+import com.avaje.ebean.dbmigration.model.MConfiguration;
+import com.avaje.ebean.dbmigration.model.MTable;
+import com.avaje.ebean.dbmigration.model.ModelContainer;
+
+/**
+ * Write context holding the buffers for both apply and rollback DDL.
+ */
+public class DdlWrite {
+
+  private final ModelContainer currentModel;
+
+  private final DdlBuffer apply;
+
+  private final DdlBuffer applyForeignKeys;
+
+  private final DdlBuffer applyHistory;
+
+  private final DdlBuffer rollbackForeignKeys;
+
+  private final DdlBuffer rollbackLast;
+
+  /**
+   * Create without any configuration or current model (no history support).
+   */
+  public DdlWrite() {
+    this(new MConfiguration(), new ModelContainer());
+  }
+
+  /**
+   * Create with a configuration.
+   */
+  public DdlWrite(MConfiguration configuration, ModelContainer currentModel) {
+    this.currentModel = currentModel;
+    this.apply = new BaseDdlBuffer(configuration);
+    this.applyForeignKeys = new BaseDdlBuffer(configuration);
+    this.applyHistory = new BaseDdlBuffer(configuration);
+    this.rollbackForeignKeys = new BaseDdlBuffer(configuration);
+    this.rollbackLast = new BaseDdlBuffer(configuration);
+  }
+
+  /**
+   * Return the Table information from the current model.
+   * <p>
+   * This is typically required for the history support (used to determine the list of columns
+   * included in the history when creating or recreating the associated trigger/stored procedure).
+   * </p>
+   */
+  public MTable getTable(String tableName) {
+    return currentModel.getTable(tableName);
+  }
+
+  /**
+   * Return the buffer that APPLY DDL is written to.
+   */
+  public DdlBuffer apply() {
+    return apply;
+  }
+
+  /**
+   * Return the buffer that APPLY DDL is written to for foreign keys and their associated indexes.
+   * <p>
+   * Statements added to this buffer are executed after all the normal apply statements and
+   * typically 'add foreign key' is added to this buffer.
+   */
+  public DdlBuffer applyForeignKeys() {
+    return applyForeignKeys;
+  }
+
+  /**
+   * Return the buffer that apply history DDL is written to.
+   */
+  public DdlBuffer applyHistory() {
+    return applyHistory;
+  }
+
+  /**
+   * Return the buffer that ROLLBACK DDL is written to for foreign keys and associated indexes.
+   */
+  public DdlBuffer rollbackForeignKeys() {
+    return rollbackForeignKeys;
+  }
+
+  /**
+   * Return the buffer that ROLLBACK DDL is written to (typically drop tables).
+   * <p>
+   * Statements added to this rollback buffer are executed after foreign key rollback
+   * has been executed.
+   */
+  public DdlBuffer rollback() {
+    return rollbackLast;
+  }
+
+
+}

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

@@ -0,0 +1,16 @@
+package com.avaje.ebean.dbmigration.ddlgeneration;
+
+import com.avaje.ebean.dbmigration.migration.CreateTable;
+
+import java.io.IOException;
+
+/**
+ * Write table DDL.
+ */
+public interface TableDdl {
+
+  /**
+   * Generate the create table DDL.
+   */
+  void generate(DdlWrite writer, CreateTable createTable) throws IOException;
+}

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/platform/BaseColumnDdl.java

@@ -0,0 +1,69 @@
+package com.avaje.ebean.dbmigration.ddlgeneration.platform;
+
+import com.avaje.ebean.dbmigration.ddlgeneration.ColumnDdl;
+import com.avaje.ebean.dbmigration.ddlgeneration.DdlBuffer;
+import com.avaje.ebean.dbmigration.ddlgeneration.DdlWrite;
+import com.avaje.ebean.dbmigration.migration.AddColumn;
+import com.avaje.ebean.dbmigration.migration.Column;
+import com.avaje.ebean.dbmigration.migration.DropColumn;
+
+import java.io.IOException;
+import java.util.List;
+
+/**
+ */
+public class BaseColumnDdl implements ColumnDdl {
+
+
+  @Override
+  public void generate(DdlWrite writer, AddColumn addColumn) throws IOException {
+
+    String tableName = addColumn.getTableName();
+    List<Column> columns = addColumn.getColumn();
+    for (Column column : columns) {
+      // apply
+      alterTableAddColumn(writer.apply(), tableName, column);
+
+      // rollback
+      alterTableDropColumn(writer.rollback(), tableName, column.getName());
+    }
+  }
+
+  @Override
+  public void generate(DdlWrite writer, DropColumn dropColumn) throws IOException {
+
+    String tableName = dropColumn.getTableName();
+
+    alterTableDropColumn(writer.apply(), tableName, dropColumn.getColumnName());
+
+    // no good rollback option here, it is best if drop columns
+    // are put into a separate changeSet that is run last
+  }
+
+  protected void alterTableDropColumn(DdlBuffer buffer, String tableName, String columnName) throws IOException {
+
+    buffer.append("alter table ").append(tableName)
+        .append(" drop column ").append(columnName)
+        .endOfStatement().end();
+  }
+
+  protected void alterTableAddColumn(DdlBuffer buffer, String tableName, Column column) throws IOException {
+
+    buffer.append("alter table ").append(tableName)
+        .append(" add column ").append(column.getName())
+        .append(" ").append(column.getType());
+
+    if (Boolean.TRUE.equals(column.isNotnull())) {
+      buffer.append(" not null");
+    }
+    if (hasValue(column.getCheckConstraint())) {
+      buffer.append(" ").append(column.getCheckConstraint());
+    }
+    buffer.endOfStatement().end();
+  }
+
+
+  protected boolean hasValue(String value) {
+    return value != null && !value.trim().isEmpty();
+  }
+}

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/platform/BaseDdlBuffer.java

@@ -0,0 +1,84 @@
+package com.avaje.ebean.dbmigration.ddlgeneration.platform;
+
+import com.avaje.ebean.dbmigration.ddlgeneration.DdlBuffer;
+import com.avaje.ebean.dbmigration.model.MConfiguration;
+
+import java.io.IOException;
+import java.io.StringWriter;
+import java.io.Writer;
+
+/**
+ * Base implementation of DdlBuffer using an underlying writer.
+ */
+public class BaseDdlBuffer implements DdlBuffer {
+
+  protected final Writer writer;
+
+  protected final MConfiguration configuration;
+
+  public BaseDdlBuffer(MConfiguration configuration) {
+    this.configuration = configuration;
+    this.writer = new StringWriter();
+  }
+
+  @Override
+  public MConfiguration getConfiguration() {
+    return configuration;
+  }
+
+  @Override
+  public DdlBuffer appendWithSpace(String foreignKeyRestrict) throws IOException {
+    if (foreignKeyRestrict != null && !foreignKeyRestrict.isEmpty()) {
+      writer.append(" ").append(foreignKeyRestrict);
+    }
+    return this;
+  }
+
+  @Override
+  public DdlBuffer append(String content) throws IOException {
+    writer.append(content);
+    return this;
+  }
+
+  @Override
+  public DdlBuffer append(String content, int space) throws IOException {
+    writer.append(content);
+    appendSpace(space, content);
+    return this;
+  }
+
+  protected void appendSpace(int max, String content) throws IOException {
+    int space = max - content.length();
+    if (space > 0) {
+      for (int i = 0; i < space; i++) {
+        append(" ");
+      }
+    }
+  }
+
+  @Override
+  public DdlBuffer endOfStatement() throws IOException {
+    writer.append(";\n");
+    return this;
+  }
+
+  /**
+   * Used to demarcate the end of a series of statements.
+   * This should be just whitespace or a sql comment.
+   */
+  @Override
+  public DdlBuffer end() throws IOException {
+    writer.append("\n");
+    return this;
+  }
+
+  @Override
+  public DdlBuffer newLine() throws IOException {
+    writer.append("\n");
+    return this;
+  }
+
+  public String getBuffer() {
+    return writer.toString();
+  }
+}

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/platform/BaseTableDdl.java

@@ -0,0 +1,356 @@
+package com.avaje.ebean.dbmigration.ddlgeneration.platform;
+
+import com.avaje.ebean.dbmigration.ddlgeneration.DdlBuffer;
+import com.avaje.ebean.dbmigration.ddlgeneration.DdlWrite;
+import com.avaje.ebean.dbmigration.ddlgeneration.TableDdl;
+import com.avaje.ebean.dbmigration.migration.Column;
+import com.avaje.ebean.dbmigration.migration.CreateTable;
+import com.avaje.ebean.dbmigration.model.MTable;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Base implementation for 'create table' and 'alter table' statements.
+ */
+public class BaseTableDdl implements TableDdl {
+
+  protected final DdlNamingConvention namingConvention;
+
+  protected final PlatformDdl platformDdl;
+
+  public BaseTableDdl(DdlNamingConvention namingConvention, PlatformDdl platformDdl) {
+    this.namingConvention = namingConvention;
+    this.platformDdl = platformDdl;
+  }
+
+  /**
+   * Generate the appropriate 'create table' and matching 'drop table' statements
+   * and add them to the 'apply' and 'rollback' buffers.
+   */
+  @Override
+  public void generate(DdlWrite writer, CreateTable createTable) throws IOException {
+
+    String tableName = createTable.getName();
+    List<Column> columns = createTable.getColumn();
+    List<Column> pk = determinePrimaryKeyColumns(columns);
+
+    DdlBuffer apply = writer.apply();
+    apply.append("create table ").append(tableName).append(" (");
+    for (int i = 0; i < columns.size(); i++) {
+      apply.newLine();
+      writeColumnDefinition(apply, columns.get(i));
+      if (i < columns.size() - 1) {
+        apply.append(",");
+      }
+    }
+
+    writeCheckConstraints(apply, createTable);
+    writeUniqueConstraints(apply, createTable);
+    writeCompoundUniqueConstraints(apply, createTable);
+    if (!pk.isEmpty()) {
+      writePrimaryKeyConstraint(apply, tableName, pk);
+    }
+
+    apply.newLine().append(")").endOfStatement();
+    apply.end();
+
+    writeAddForeignKeys(writer, createTable);
+
+    // add drop table to the rollback buffer
+    dropTable(writer.rollback(), tableName);
+
+    if (isTrue(createTable.isWithHistory())) {
+      createWithHistory(writer, createTable.getName());
+    }
+
+  }
+
+  private void createWithHistory(DdlWrite writer, String name) throws IOException {
+
+    MTable table = writer.getTable(name);
+    platformDdl.createWithHistory(writer, table);
+  }
+
+  protected void writeAddForeignKeys(DdlWrite write, CreateTable createTable) throws IOException {
+
+    List<Column> columns = createTable.getColumn();
+    for (Column column : columns) {
+      String references = column.getReferences();
+      if (hasValue(references)) {
+        writeForeignKey(write, createTable.getName(), column.getName(), references);
+      }
+    }
+    //createTable.
+
+  }
+
+  protected void writeForeignKey(DdlWrite write, String tableName, String columnName, String references) throws IOException {
+
+    String fkName = determineForeignKeyConstraintName(tableName, columnName);
+
+    int pos = references.lastIndexOf('.');
+    if (pos == -1) {
+      throw new IllegalStateException("Expecting period '.' character for table.column split but not found in [" + references + "]");
+    }
+    String refTableName = references.substring(0, pos);
+    String refColumnName = references.substring(pos + 1);
+
+    String[] cols = {columnName};
+    String[] refCols = {refColumnName};
+
+    writeForeignKey(write, fkName, tableName, cols, refTableName, refCols);
+  }
+
+  protected void writeForeignKey(DdlWrite write, String fkName, String tableName, String[] columns, String refTable, String[] refColumns) throws IOException {
+
+    DdlBuffer fkeyBuffer = write.applyForeignKeys();
+    fkeyBuffer
+        .append("alter table ").append(tableName)
+        .append(" add constraint ").append(fkName)
+        .append(" foreign key (");
+    appendColumns(columns, fkeyBuffer);
+    fkeyBuffer
+        .append(") references ")
+        .append(refTable);
+    appendColumns(refColumns, fkeyBuffer);
+    fkeyBuffer.appendWithSpace(platformDdl.getForeignKeyRestrict())
+        .endOfStatement();
+
+    String indexName = determineForeignKeyIndexName(tableName, columns);
+
+    fkeyBuffer.append("create index ").append(indexName).append(" on ").append(tableName);
+    appendColumns(columns, fkeyBuffer);
+    fkeyBuffer.endOfStatement();
+
+    fkeyBuffer.end();
+
+    write.rollbackForeignKeys()
+        .append("drop index ").append(indexName)
+        .endOfStatement();
+
+    write.rollbackForeignKeys()
+        .append("alter table ").append(tableName).append(" drop constraint ").append(fkName)
+        .endOfStatement();
+
+    write.rollbackForeignKeys().end();
+
+  }
+
+  private void appendColumns(String[] columns, DdlBuffer buffer) throws IOException {
+    buffer.append(" (");
+    for (int i = 0; i <columns.length ; i++) {
+      if (i > 0) {
+        buffer.append(",");
+      }
+      buffer.append(columns[i]);
+    }
+    buffer.append(")");
+  }
+
+
+  /**
+   * Add 'drop table' statement to the buffer.
+   */
+  protected void dropTable(DdlBuffer buffer, String tableName) throws IOException {
+
+    buffer.append("drop table ").append(tableName).endOfStatement().end();
+  }
+
+  /**
+   * Write all the check constraints.
+   */
+  protected void writeCheckConstraints(DdlBuffer apply, CreateTable createTable) throws IOException {
+
+    List<Column> columns = createTable.getColumn();
+    for (Column column : columns) {
+      String checkConstraint = column.getCheckConstraint();
+      if (hasValue(checkConstraint)) {
+        writeCheckConstraint(apply, createTable.getName(), column, checkConstraint);
+      }
+    }
+  }
+
+  /**
+   * Write a check constraint.
+   */
+  protected void writeCheckConstraint(DdlBuffer buffer, String tableName, Column column, String checkConstraint) throws IOException {
+
+    String ckName = determineCheckConstraintName(tableName, column.getName());
+
+    buffer.append(",").newLine();
+    buffer.append("  constraint ").append(ckName);
+    buffer.append(" ").append(checkConstraint);
+  }
+
+  protected void writeCompoundUniqueConstraints(DdlBuffer apply, CreateTable createTable) {
+    //TODO: Write compound unique constraints
+  }
+
+  /**
+   * Write the unique constraints inline with the create table statement.
+   */
+  protected void writeUniqueConstraints(DdlBuffer apply, CreateTable createTable) throws IOException {
+
+    List<Column> columns = createTable.getColumn();
+    for (Column column : columns) {
+      if (isTrue(column.isUnique())) {
+        inlineUniqueConstraintSingle(apply, createTable.getName(), column);
+      }
+    }
+  }
+
+  /**
+   * Write the unique constraint inline with the create table statement.
+   */
+  protected void inlineUniqueConstraintSingle(DdlBuffer buffer, String tableName, Column column) throws IOException {
+
+    String uqName = determineUniqueConstraintName(tableName, column.getName());
+
+    buffer.append(",").newLine();
+    buffer.append("  constraint ").append(uqName).append(" unique ");
+    buffer.append("(");
+    buffer.append(column.getName());
+    buffer.append(")");
+  }
+
+  /**
+   * Write the primary key constraint inline with the create table statement.
+   */
+  protected void writePrimaryKeyConstraint(DdlBuffer buffer, String tableName, List<Column> pk) throws IOException {
+
+    String pkName = determinePrimaryKeyName(tableName, pk);
+
+    buffer.append(",").newLine();
+    buffer.append("  constraint ").append(pkName).append(" primary key ");
+    buffer.append("(");
+    for (int i = 0; i < pk.size(); i++) {
+      if (i > 0) {
+        buffer.append(",");
+      }
+      buffer.append(pk.get(i).getName());
+    }
+    buffer.append(")");
+  }
+
+  /**
+   * Write alter table add primary key statement.
+   */
+  public void alterTableAddPrimaryKey(DdlBuffer buffer, String tableName, List<Column> pk) throws IOException {
+
+    String pkName = determinePrimaryKeyName(tableName, pk);
+
+    buffer.append("alter table ").append(tableName);
+    buffer.append(" add primary key ").append(pkName).append(" (");
+    for (int i = 0; i < pk.size(); i++) {
+      if (i > 0) {
+        buffer.append(",");
+      }
+      buffer.append(pk.get(i).getName());
+    }
+    buffer.append(")").endOfStatement();
+  }
+
+  /**
+   * Write the column definition to the create table statement.
+   */
+  protected void writeColumnDefinition(DdlBuffer buffer, Column column) throws IOException {
+
+    String platformType = convertToPlatformType(column.getType(), isTrue(column.isIdentity()));
+
+    buffer.append("  ");
+    buffer.append(column.getName(), 30);
+    buffer.append(platformType);
+    if (isTrue(column.isNotnull()) || isTrue(column.isPrimaryKey())) {
+      buffer.append(" not null");
+    }
+
+    // add check constraints later as we really want to give them a nice name
+    // so that the database can potentially provide a nice SQL error
+  }
+
+  /**
+   * Convert the expected logical type into a platform specific one.
+   * <p>
+   * For example clob -> text for postgres.
+   * </p>
+   */
+  protected String convertToPlatformType(String type, boolean identity) {
+    return platformDdl.convert(type, identity);
+  }
+
+  /**
+   * Return the primary key constraint name.
+   */
+  protected String determinePrimaryKeyName(String tableName, List<Column> pkColumns) {
+
+    // collect the primary key column names
+    List<String> pkColumnNames = new ArrayList<String>(pkColumns.size());
+    for (int i = 0; i < pkColumns.size(); i++) {
+      pkColumnNames.add(pkColumns.get(i).getName());
+    }
+    return namingConvention.primaryKeyName(tableName, pkColumnNames);
+  }
+
+  /**
+   * Return the foreign key constraint name given a single column foreign key.
+   */
+  protected String determineForeignKeyConstraintName(String tableName, String columnName) {
+
+    return namingConvention.foreignKeyConstraintName(tableName, columnName);
+  }
+
+  /**
+   * Return the foreign key constraint name given a single column foreign key.
+   */
+  protected String determineForeignKeyIndexName(String tableName, String[] columns) {
+
+    return namingConvention.foreignKeyIndexName(tableName, columns);
+  }
+
+  /**
+   * Return the unique constraint name.
+   */
+  protected String determineUniqueConstraintName(String tableName, String columnName) {
+
+    return namingConvention.uniqueConstraintName(tableName, columnName);
+  }
+
+  /**
+   * Return the constraint name.
+   */
+  protected String determineCheckConstraintName(String tableName, String columnName) {
+
+    return namingConvention.checkConstraintName(tableName, columnName);
+  }
+
+  /**
+   * Return the list of columns that make the primary key.
+   */
+  protected List<Column> determinePrimaryKeyColumns(List<Column> columns) {
+    List<Column> pk = new ArrayList<Column>(3);
+    for (Column column : columns) {
+      if (isTrue(column.isPrimaryKey())) {
+        pk.add(column);
+      }
+    }
+    return pk;
+  }
+
+  /**
+   * Return true if null or trimmed string is empty.
+   */
+  protected boolean hasValue(String value) {
+    return value != null && !value.trim().isEmpty();
+  }
+
+  /**
+   * Null safe Boolean true test.
+   */
+  protected boolean isTrue(Boolean value) {
+    return Boolean.TRUE.equals(value);
+  }
+
+
+}

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/platform/DbNameNormalise.java

@@ -0,0 +1,42 @@
+package com.avaje.ebean.dbmigration.ddlgeneration.platform;
+
+/**
+ * Used to normalise table and column names which means stripping out
+ * quoted identifier characters and any catalog or schema prefix.
+ */
+public class DbNameNormalise {
+
+  protected boolean lowerCase = true;
+
+  protected String[] quotedIdentifiers = {"\"", "'", "[", "]", "`"};
+
+  /**
+   * Normalise the table name by trimming catalog and schema and removing any
+   * quoted identifier characters (",',[,] etc).
+   */
+  public String normalise(String tableName) {
+
+    tableName = trimQuotes(tableName);
+    int lastPeriod = tableName.lastIndexOf('.');
+    if (lastPeriod > -1) {
+      tableName = tableName.substring(lastPeriod + 1);
+    }
+    if (lowerCase) {
+      tableName = tableName.toLowerCase();
+    }
+    return tableName;
+  }
+
+  /**
+   * Trim off the platform quoted identifier quotes like [ ' and ".
+   */
+  protected String trimQuotes(String tableName) {
+
+    // remove quoted identifier characters
+    for (int i = 0; i < quotedIdentifiers.length; i++) {
+      tableName = tableName.replace(quotedIdentifiers[i], "");
+    }
+    return tableName;
+  }
+
+}

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/platform/DdlNamingConvention.java

@@ -0,0 +1,96 @@
+package com.avaje.ebean.dbmigration.ddlgeneration.platform;
+
+import com.avaje.ebeaninternal.server.type.ScalarTypeBoolean;
+
+import java.util.List;
+
+/**
+ * Naming convention used for constraint names.
+ */
+public class DdlNamingConvention {
+
+  protected String pkPrefix = "pk_";
+  protected String pkSuffix = "";
+
+  protected String fkPrefix = "fk_";
+  protected String fkMiddle = "_";
+  protected String fkSuffix = "";
+
+  protected String fkIndexPrefix = "ix_";
+  protected String fkIndexMiddle = "_";
+  protected String fkIndexSuffix = "";
+
+  protected String uqPrefix = "uq_";
+  protected String uqSuffix = "";
+
+  protected String ckPrefix = "ck_";
+  protected String ckSuffix = "";
+
+  protected final DbNameNormalise normalise;
+
+  public DdlNamingConvention() {
+    this.normalise = new DbNameNormalise();
+  }
+
+  /**
+   * Return the primary key constraint name.
+   */
+  public String primaryKeyName(String tableName, List<String> pkColumns) {
+
+    return pkPrefix + normalise(tableName) + pkSuffix;
+  }
+
+  /**
+   * Return the foreign key constraint name given a single column foreign key.
+   */
+  public String foreignKeyConstraintName(String tableName, String columnName) {
+    return fkPrefix + normalise(tableName) + fkMiddle + normalise(columnName) + fkSuffix;
+  }
+
+  /**
+   * Return the index name associated with a foreign key constraint given a single column foreign key.
+   */
+  public String foreignKeyIndexName(String tableName, String[] columns) {
+
+    String cols = columns.length == 1 ? normalise(columns[0]) : joinColumns(columns);
+    return fkIndexPrefix + normalise(tableName) + fkIndexMiddle + cols + fkIndexSuffix;
+  }
+
+  private String joinColumns(String[] columns) {
+
+    //TODO: Fix this to handle maximum constraint name limits
+    StringBuilder sb = new StringBuilder(30);
+    for (int i = 0; i < columns.length; i++) {
+      if (i > 0) {
+        sb.append("-");
+      }
+      sb.append(columns[i]);
+    }
+    return sb.toString();
+  }
+
+  /**
+   * Return the unique constraint name.
+   */
+  public String uniqueConstraintName(String tableName, String columnName) {
+
+    return uqPrefix + normalise(tableName) + "_" + normalise(columnName) + uqSuffix;
+  }
+
+  /**
+   * Return the check constraint name.
+   */
+  public String checkConstraintName(String tableName, String columnName) {
+
+    return ckPrefix + normalise(tableName) + "_" + normalise(columnName) + ckSuffix;
+  }
+
+  /**
+   * Normalise the table name by trimming catalog and schema and removing any
+   * quoted identifier characters (",',[,] etc).
+   */
+  protected String normalise(String tableName) {
+
+    return normalise.normalise(tableName);
+  }
+}

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/platform/H2Ddl.java

@@ -0,0 +1,14 @@
+package com.avaje.ebean.dbmigration.ddlgeneration.platform;
+
+import com.avaje.ebean.config.dbplatform.DbTypeMap;
+
+/**
+ * H2 platform specific DDL.
+ */
+public class H2Ddl extends PlatformDdl {
+
+  public H2Ddl(DbTypeMap platformTypes) {
+    super(platformTypes, new H2HistoryDdl());
+    this.foreignKeyRestrict = "on delete restrict on update restrict";
+  }
+}

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/platform/H2HistoryDdl.java

@@ -0,0 +1,17 @@
+package com.avaje.ebean.dbmigration.ddlgeneration.platform;
+
+import com.avaje.ebean.dbmigration.ddlgeneration.DdlWrite;
+import com.avaje.ebean.dbmigration.model.MTable;
+
+import java.io.IOException;
+
+/**
+ *
+ */
+public class H2HistoryDdl implements PlatformHistoryDdl {
+
+  @Override
+  public void createWithHistory(DdlWrite writer, MTable table) throws IOException {
+    // does nothing, not supported yet
+  }
+}

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/platform/PlatformDdl.java

@@ -0,0 +1,53 @@
+package com.avaje.ebean.dbmigration.ddlgeneration.platform;
+
+import com.avaje.ebean.config.dbplatform.DbTypeMap;
+import com.avaje.ebean.dbmigration.ddlgeneration.DdlWrite;
+import com.avaje.ebean.dbmigration.model.MTable;
+
+import java.io.IOException;
+
+/**
+ *
+ */
+public class PlatformDdl {
+
+  protected final PlatformHistoryDdl historyDdl;
+
+  protected final PlatformTypeConverter typeConverter;
+
+  protected String foreignKeyRestrict = "";
+
+  public PlatformDdl(DbTypeMap platformTypes, PlatformHistoryDdl historyDdl) {
+    this.typeConverter = new PlatformTypeConverter(platformTypes);
+    this.historyDdl = historyDdl;
+  }
+
+  /**
+   * Modify and return the column definition for autoincrement or identity definition.
+   */
+  public String asIdentityColumn(String columnDefn) {
+    return columnDefn;
+  }
+
+  /**
+   * Return the foreign key on delete on update restrict clause.
+   */
+  public String getForeignKeyRestrict() {
+    return foreignKeyRestrict;
+  }
+
+  /**
+   * Convert the standard type to the platform specific type.
+   */
+  public String convert(String type, boolean identity) {
+    String platformType = typeConverter.convert(type);
+    return identity ? asIdentityColumn(platformType) : platformType;
+  }
+
+  /**
+   * Add history support to this table using the platform specific mechanism.
+   */
+  public void createWithHistory(DdlWrite writer, MTable table) throws IOException {
+    historyDdl.createWithHistory(writer, table);
+  }
+}

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/platform/PlatformHistoryDdl.java

@@ -0,0 +1,17 @@
+package com.avaje.ebean.dbmigration.ddlgeneration.platform;
+
+import com.avaje.ebean.dbmigration.ddlgeneration.DdlWrite;
+import com.avaje.ebean.dbmigration.model.MTable;
+
+import java.io.IOException;
+
+/**
+ * Defines the implementation for adding history support to a table.
+ */
+public interface PlatformHistoryDdl {
+
+  /**
+   * Add history support to the table using platform specific mechanism.
+   */
+  void createWithHistory(DdlWrite writer, MTable table) throws IOException;
+}

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/platform/PlatformTypeConverter.java

@@ -0,0 +1,84 @@
+package com.avaje.ebean.dbmigration.ddlgeneration.platform;
+
+import com.avaje.ebean.config.dbplatform.DbType;
+import com.avaje.ebean.config.dbplatform.DbTypeMap;
+
+/**
+ * Converts a logical column definition into platform specific one.
+ *
+ * This translates standard sql types into platform specific ones.
+ */
+public class PlatformTypeConverter {
+
+  protected final DbTypeMap platformTypes;
+
+  /**
+   * Construct with the platform specific types.
+   */
+  public PlatformTypeConverter(DbTypeMap platformTypes) {
+    this.platformTypes = platformTypes;
+  }
+
+  /**
+   * Convert the standard type to the platform specific type.
+   */
+  public String convert(String columnDefinition) {
+
+    int open = columnDefinition.indexOf('(');
+    if (open > -1) {
+      // no scale or precision
+      return convertWithScale(columnDefinition, open);
+    } else {
+      return convertNoScale(columnDefinition);
+    }
+  }
+
+  /**
+   * Convert a type that has scale and possibly precision.
+   */
+  protected String convertWithScale(String columnDefinition, int open) {
+
+    int close = columnDefinition.lastIndexOf(')');
+    if (close == -1) {
+      // assume already platform specific, leave as is
+      return columnDefinition;
+    }
+
+    String type = columnDefinition.substring(0,open);
+    try {
+      DbType dbType = platformTypes.lookup(type);
+      int comma = columnDefinition.indexOf(',',open);
+      if (comma > -1) {
+        // scale and precision - decimal(10,4)
+        int scale = Integer.parseInt(columnDefinition.substring(open+1, comma));
+        int precision = Integer.parseInt(columnDefinition.substring(comma+1, close));
+        return  dbType.renderType(scale,precision);
+
+      } else {
+        // scale - varchar(10)
+        int scale = Integer.parseInt(columnDefinition.substring(open+1, close));
+        return  dbType.renderType(scale,0);
+      }
+
+    } catch (IllegalArgumentException e) {
+      // assume already platform specific, leave as is
+      return columnDefinition;
+    }
+  }
+
+  /**
+   * Convert a simple type with not scale or precision.
+   */
+  protected String convertNoScale(String columnDefinition) {
+
+    try {
+      DbType dbType = platformTypes.lookup(columnDefinition);
+      return  dbType.renderType(0,0);
+
+    } catch (IllegalArgumentException e) {
+      // assume already platform specific, leave as is
+      return columnDefinition;
+    }
+  }
+
+}

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/platform/PostgresDdl.java

@@ -0,0 +1,31 @@
+package com.avaje.ebean.dbmigration.ddlgeneration.platform;
+
+import com.avaje.ebean.config.dbplatform.DbTypeMap;
+
+/**
+ * Postgres specific DDL.
+ */
+public class PostgresDdl extends PlatformDdl {
+
+  public PostgresDdl(DbTypeMap platformTypes) {
+    super(platformTypes, new PostgresHistoryDdl());
+    this.foreignKeyRestrict = "on delete restrict on update restrict";
+  }
+
+  /**
+   * Map bigint, integer and smallint into their equivalent serial types.
+   */
+  public String asIdentityColumn(String columnDefn) {
+
+    if ("bigint".equalsIgnoreCase(columnDefn)) {
+      return "bigserial";
+    }
+    if ("integer".equalsIgnoreCase(columnDefn)) {
+      return "serial";
+    }
+    if ("smallint".equalsIgnoreCase(columnDefn)) {
+      return "smallserial";
+    }
+    return columnDefn;
+  }
+}

src/main/java/com/avaje/ebean/dbmigration/ddlgeneration/platform/PostgresHistoryDdl.java

@@ -0,0 +1,135 @@
+package com.avaje.ebean.dbmigration.ddlgeneration.platform;
+
+import com.avaje.ebean.dbmigration.ddlgeneration.DdlBuffer;
+import com.avaje.ebean.dbmigration.ddlgeneration.DdlWrite;
+import com.avaje.ebean.dbmigration.model.MColumn;
+import com.avaje.ebean.dbmigration.model.MTable;
+
+import java.io.IOException;
+import java.util.Collection;
+
+/**
+ *
+ */
+public class PostgresHistoryDdl implements PlatformHistoryDdl {
+
+  DbNameNormalise normalise = new DbNameNormalise();
+
+  protected String historyTableName(String baseTableName) {
+    return baseTableName + "_history";
+  }
+
+  protected String procedureName(String baseTableName) {
+    return baseTableName + "_history_version";
+  }
+
+  protected String triggerName(String baseTableName) {
+    return baseTableName + "_history_upd";
+  }
+
+  public void createWithHistory(DdlWrite writer, MTable table) throws IOException {
+
+    // naming convention
+
+    addHistoryTable(writer, table);
+    addStoredFunction(writer, table);
+    addTrigger(writer, table);
+  }
+
+  public void addHistoryTable(DdlWrite writer, MTable table) throws IOException {
+
+    String baseTableName = this.normalise.normalise(table.getName());
+
+    DdlBuffer buffer = writer.applyHistory();
+
+    buffer
+        .append("alter table ").append(baseTableName)
+        .append(" add column sys_period tstzrange not null")
+        .endOfStatement().end();
+
+    buffer
+        .append("create table ").append(baseTableName).append("_history")
+        .append(" (like ").append(baseTableName).append(")")
+        .endOfStatement().end();
+
+    buffer
+        .append("create view ").append(baseTableName).append("_with_history")
+        .append(" as select * from").append(baseTableName)
+        .append(" union all select * from").append(baseTableName).append("_history")
+        .endOfStatement().end();
+
+  }
+
+  public void addTrigger(DdlWrite writer, MTable table) throws IOException {
+
+    String baseTableName = this.normalise.normalise(table.getName());
+    String procedureName = procedureName(baseTableName);
+    String triggerName = triggerName(baseTableName);
+
+    DdlBuffer buffer = writer.applyHistory();
+    buffer
+        .append("create trigger ").append(triggerName).newLine()
+        .append("  before insert or update or delete on ").append(baseTableName).newLine()
+        .append("  for each row execute procedure ").append(procedureName).append("();").newLine().newLine();
+
+  }
+
+
+  public void addStoredFunction(DdlWrite writer, MTable table) throws IOException {
+
+    String baseTableName = this.normalise.normalise(table.getName());
+    String procedureName = procedureName(baseTableName);
+    DdlBuffer buffer = writer.applyHistory();
+
+    buffer
+        .append("create or replace function ").append(procedureName).append("() returns trigger as $$").newLine()
+        .append("begin").newLine();
+    buffer
+        .append("  if (TG_OP = 'INSERT') then").newLine()
+        .append("    NEW.sys_period = tstzrange(CURRENT_TIMESTAMP,null);").newLine()
+        .append("    return new;").newLine().newLine();
+    buffer
+        .append("  elsif (TG_OP = 'UPDATE') then").newLine();
+    appendInsertIntoHistory(buffer, table);
+    buffer
+        .append("    NEW.sys_period = tstzrange(CURRENT_TIMESTAMP,null);").newLine()
+        .append("    return new;").newLine().newLine();
+    buffer
+        .append("  elsif (TG_OP = 'DELETE') then").newLine();
+    appendInsertIntoHistory(buffer, table);
+    buffer
+        .append("    return old;").newLine().newLine();
+
+    buffer
+        .append("  end if;").newLine()
+        .append("end;").newLine()
+        .append("$$ LANGUAGE plpgsql;").newLine();
+
+    buffer.end();
+  }
+
+  protected void appendInsertIntoHistory(DdlBuffer buffer, MTable table) throws IOException {
+
+    String historyTable  = historyTableName(table.getName());
+
+    buffer.append("    insert into ").append(historyTable).append(" (sys_period,");
+    appendColumnNames(buffer, table, "");
+    buffer.append(") values (tstzrange(lower(OLD.sys_period), CURRENT_TIMESTAMP), ");
+    appendColumnNames(buffer, table, "OLD.");
+    buffer.append(");").newLine();
+  }
+
+  protected void appendColumnNames(DdlBuffer buffer, MTable table, String columnPrefix) throws IOException {
+
+    //id, line1, line2, city, country_code, version, when_created, when_updated
+    Collection<MColumn> columns = table.getColumns().values();
+    int i = 0;
+    for (MColumn column : columns) {
+      if (++i > 1) {
+        buffer.append(", ");
+      }
+      buffer.append(columnPrefix);
+      buffer.append(column.getName());
+    }
+  }
+}

src/main/java/com/avaje/ebean/dbmigration/migration/AddColumn.java

@@ -0,0 +1,99 @@
+
+package com.avaje.ebean.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;
+import java.util.List;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;sequence>
+ *         &lt;element ref="{http://ebean-orm.github.io/xml/ns/dbmigration}column" maxOccurs="unbounded"/>
+ *       &lt;/sequence>
+ *       &lt;attribute name="tableName" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "", propOrder = {
+    "column"
+})
+@XmlRootElement(name = "addColumn")
+public class AddColumn {
+
+    @XmlElement(required = true)
+    protected List<Column> column;
+    @XmlAttribute(name = "tableName", required = true)
+    protected String tableName;
+
+    /**
+     * Gets the value of the column 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 column property.
+     * 
+     * <p>
+     * For example, to add a new item, do as follows:
+     * <pre>
+     *    getColumn().add(newItem);
+     * </pre>
+     * 
+     * 
+     * <p>
+     * Objects of the following type(s) are allowed in the list
+     * {@link Column }
+     * 
+     * 
+     */
+    public List<Column> getColumn() {
+        if (column == null) {
+            column = new ArrayList<Column>();
+        }
+        return this.column;
+    }
+
+    /**
+     * Gets the value of the tableName property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getTableName() {
+        return tableName;
+    }
+
+    /**
+     * Sets the value of the tableName property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setTableName(String value) {
+        this.tableName = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/AddForeignKey.java

@@ -0,0 +1,143 @@
+
+package com.avaje.ebean.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.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+import javax.xml.bind.annotation.XmlValue;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;simpleContent>
+ *     &lt;extension base="&lt;http://www.w3.org/2001/XMLSchema>string">
+ *       &lt;attribute name="name" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="columns" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="references" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *     &lt;/extension>
+ *   &lt;/simpleContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "", propOrder = {
+    "value"
+})
+@XmlRootElement(name = "addForeignKey")
+public class AddForeignKey {
+
+    @XmlValue
+    protected String value;
+    @XmlAttribute(name = "name", required = true)
+    protected String name;
+    @XmlAttribute(name = "columns", required = true)
+    protected String columns;
+    @XmlAttribute(name = "references", required = true)
+    protected String references;
+
+    /**
+     * Gets the value of the value property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getValue() {
+        return value;
+    }
+
+    /**
+     * Sets the value of the value property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setValue(String value) {
+        this.value = value;
+    }
+
+    /**
+     * Gets the value of the name property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * Sets the value of the name property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setName(String value) {
+        this.name = value;
+    }
+
+    /**
+     * Gets the value of the columns property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getColumns() {
+        return columns;
+    }
+
+    /**
+     * Sets the value of the columns property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setColumns(String value) {
+        this.columns = value;
+    }
+
+    /**
+     * Gets the value of the references property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getReferences() {
+        return references;
+    }
+
+    /**
+     * Sets the value of the references property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setReferences(String value) {
+        this.references = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/Application.java

@@ -0,0 +1,87 @@
+
+package com.avaje.ebean.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.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <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="resourcePath" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "")
+@XmlRootElement(name = "application")
+public class Application {
+
+    @XmlAttribute(name = "name", required = true)
+    protected String name;
+    @XmlAttribute(name = "resourcePath", required = true)
+    protected String resourcePath;
+
+    /**
+     * Gets the value of the name property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * Sets the value of the name property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setName(String value) {
+        this.name = value;
+    }
+
+    /**
+     * Gets the value of the resourcePath property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getResourcePath() {
+        return resourcePath;
+    }
+
+    /**
+     * Sets the value of the resourcePath property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setResourcePath(String value) {
+        this.resourcePath = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/Applications.java

@@ -0,0 +1,69 @@
+
+package com.avaje.ebean.dbmigration.migration;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+import java.util.ArrayList;
+import java.util.List;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;sequence>
+ *         &lt;element ref="{http://ebean-orm.github.io/xml/ns/dbmigration}application" maxOccurs="unbounded" minOccurs="0"/>
+ *       &lt;/sequence>
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "", propOrder = {
+    "application"
+})
+@XmlRootElement(name = "applications")
+public class Applications {
+
+    protected List<Application> application;
+
+    /**
+     * Gets the value of the application 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 application property.
+     * 
+     * <p>
+     * For example, to add a new item, do as follows:
+     * <pre>
+     *    getApplication().add(newItem);
+     * </pre>
+     * 
+     * 
+     * <p>
+     * Objects of the following type(s) are allowed in the list
+     * {@link Application }
+     * 
+     * 
+     */
+    public List<Application> getApplication() {
+        if (application == null) {
+            application = new ArrayList<Application>();
+        }
+        return this.application;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/Apply.java

@@ -0,0 +1,61 @@
+
+package com.avaje.ebean.dbmigration.migration;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+import javax.xml.bind.annotation.XmlValue;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;simpleContent>
+ *     &lt;extension base="&lt;http://www.w3.org/2001/XMLSchema>string">
+ *     &lt;/extension>
+ *   &lt;/simpleContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "", propOrder = {
+    "value"
+})
+@XmlRootElement(name = "apply")
+public class Apply {
+
+    @XmlValue
+    protected String value;
+
+    /**
+     * Gets the value of the value property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getValue() {
+        return value;
+    }
+
+    /**
+     * Sets the value of the value property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setValue(String value) {
+        this.value = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/ChangeSet.java

@@ -0,0 +1,160 @@
+
+package com.avaje.ebean.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.XmlElements;
+import javax.xml.bind.annotation.XmlRootElement;
+import javax.xml.bind.annotation.XmlSchemaType;
+import javax.xml.bind.annotation.XmlType;
+import java.math.BigInteger;
+import java.util.ArrayList;
+import java.util.List;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;sequence>
+ *         &lt;choice>
+ *           &lt;group ref="{http://ebean-orm.github.io/xml/ns/dbmigration}changeSetChildren" maxOccurs="unbounded" minOccurs="0"/>
+ *         &lt;/choice>
+ *       &lt;/sequence>
+ *       &lt;attribute name="id" use="required" type="{http://www.w3.org/2001/XMLSchema}positiveInteger" />
+ *       &lt;attribute name="comment" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "", propOrder = {
+    "changeSetChildren"
+})
+@XmlRootElement(name = "changeSet")
+public class ChangeSet {
+
+    @XmlElements({
+        @XmlElement(name = "configuration", type = Configuration.class),
+        @XmlElement(name = "sql", type = Sql.class),
+        @XmlElement(name = "createTable", type = CreateTable.class),
+        @XmlElement(name = "dropTable", type = DropTable.class),
+        @XmlElement(name = "renameTable", type = RenameTable.class),
+        @XmlElement(name = "addHistoryTable", type = CreateHistoryTable.class),
+        @XmlElement(name = "createView", type = CreateView.class),
+        @XmlElement(name = "dropView", type = DropView.class),
+        @XmlElement(name = "renameView", type = RenameView.class),
+        @XmlElement(name = "addColumn", type = AddColumn.class),
+        @XmlElement(name = "dropColumn", type = DropColumn.class),
+        @XmlElement(name = "renameColumn", type = RenameColumn.class),
+        @XmlElement(name = "addForeignKey", type = AddForeignKey.class),
+        @XmlElement(name = "dropForeignKey", type = DropForeignKey.class)
+    })
+    protected List<Object> changeSetChildren;
+    @XmlAttribute(name = "id", required = true)
+    @XmlSchemaType(name = "positiveInteger")
+    protected BigInteger id;
+    @XmlAttribute(name = "comment")
+    protected String comment;
+
+    /**
+     * Gets the value of the changeSetChildren 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 changeSetChildren property.
+     * 
+     * <p>
+     * For example, to add a new item, do as follows:
+     * <pre>
+     *    getChangeSetChildren().add(newItem);
+     * </pre>
+     * 
+     * 
+     * <p>
+     * Objects of the following type(s) are allowed in the list
+     * {@link Configuration }
+     * {@link Sql }
+     * {@link CreateTable }
+     * {@link DropTable }
+     * {@link RenameTable }
+     * {@link CreateHistoryTable }
+     * {@link CreateView }
+     * {@link DropView }
+     * {@link RenameView }
+     * {@link AddColumn }
+     * {@link DropColumn }
+     * {@link RenameColumn }
+     * {@link AddForeignKey }
+     * {@link DropForeignKey }
+     * 
+     * 
+     */
+    public List<Object> getChangeSetChildren() {
+        if (changeSetChildren == null) {
+            changeSetChildren = new ArrayList<Object>();
+        }
+        return this.changeSetChildren;
+    }
+
+    /**
+     * Gets the value of the id property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link BigInteger }
+     *     
+     */
+    public BigInteger getId() {
+        return id;
+    }
+
+    /**
+     * Sets the value of the id property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link BigInteger }
+     *     
+     */
+    public void setId(BigInteger value) {
+        this.id = value;
+    }
+
+    /**
+     * Gets the value of the comment property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getComment() {
+        return comment;
+    }
+
+    /**
+     * Sets the value of the comment property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setComment(String value) {
+        this.comment = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/Column.java

@@ -0,0 +1,402 @@
+
+package com.avaje.ebean.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.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+import javax.xml.bind.annotation.XmlValue;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;attGroup ref="{http://ebean-orm.github.io/xml/ns/dbmigration}column"/>
+ *       &lt;attGroup ref="{http://ebean-orm.github.io/xml/ns/dbmigration}columnAttributes"/>
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "", propOrder = {
+    "content"
+})
+@XmlRootElement(name = "column")
+public class Column {
+
+    @XmlValue
+    protected String content;
+    @XmlAttribute(name = "name", required = true)
+    protected String name;
+    @XmlAttribute(name = "type", required = true)
+    protected String type;
+    @XmlAttribute(name = "defaultValue")
+    protected String defaultValue;
+    @XmlAttribute(name = "remarks")
+    protected String remarks;
+    @XmlAttribute(name = "notnull")
+    protected Boolean notnull;
+    @XmlAttribute(name = "checkConstraint")
+    protected String checkConstraint;
+    @XmlAttribute(name = "unique")
+    protected Boolean unique;
+    @XmlAttribute(name = "primaryKey")
+    protected Boolean primaryKey;
+    @XmlAttribute(name = "identity")
+    protected Boolean identity;
+    @XmlAttribute(name = "references")
+    protected String references;
+    @XmlAttribute(name = "deleteCascade")
+    protected Boolean deleteCascade;
+    @XmlAttribute(name = "deferrable")
+    protected Boolean deferrable;
+    @XmlAttribute(name = "initiallyDeferred")
+    protected Boolean initiallyDeferred;
+
+    /**
+     * Gets the value of the content property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getContent() {
+        return content;
+    }
+
+    /**
+     * Sets the value of the content property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setContent(String value) {
+        this.content = value;
+    }
+
+    /**
+     * Gets the value of the name property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * Sets the value of the name property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setName(String value) {
+        this.name = value;
+    }
+
+    /**
+     * Gets the value of the type property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getType() {
+        return type;
+    }
+
+    /**
+     * Sets the value of the type property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setType(String value) {
+        this.type = value;
+    }
+
+    /**
+     * Gets the value of the defaultValue property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getDefaultValue() {
+        return defaultValue;
+    }
+
+    /**
+     * Sets the value of the defaultValue property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setDefaultValue(String value) {
+        this.defaultValue = value;
+    }
+
+    /**
+     * Gets the value of the remarks property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getRemarks() {
+        return remarks;
+    }
+
+    /**
+     * Sets the value of the remarks property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setRemarks(String value) {
+        this.remarks = value;
+    }
+
+    /**
+     * Gets the value of the notnull property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link Boolean }
+     *     
+     */
+    public Boolean isNotnull() {
+        return notnull;
+    }
+
+    /**
+     * Sets the value of the notnull property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link Boolean }
+     *     
+     */
+    public void setNotnull(Boolean value) {
+        this.notnull = value;
+    }
+
+    /**
+     * Gets the value of the checkConstraint property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getCheckConstraint() {
+        return checkConstraint;
+    }
+
+    /**
+     * Sets the value of the checkConstraint property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setCheckConstraint(String value) {
+        this.checkConstraint = value;
+    }
+
+    /**
+     * Gets the value of the unique property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link Boolean }
+     *     
+     */
+    public Boolean isUnique() {
+        return unique;
+    }
+
+    /**
+     * Sets the value of the unique property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link Boolean }
+     *     
+     */
+    public void setUnique(Boolean value) {
+        this.unique = value;
+    }
+
+    /**
+     * Gets the value of the primaryKey property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link Boolean }
+     *     
+     */
+    public Boolean isPrimaryKey() {
+        return primaryKey;
+    }
+
+    /**
+     * Sets the value of the primaryKey property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link Boolean }
+     *     
+     */
+    public void setPrimaryKey(Boolean value) {
+        this.primaryKey = value;
+    }
+
+    /**
+     * Gets the value of the identity property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link Boolean }
+     *     
+     */
+    public Boolean isIdentity() {
+        return identity;
+    }
+
+    /**
+     * Sets the value of the identity property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link Boolean }
+     *     
+     */
+    public void setIdentity(Boolean value) {
+        this.identity = value;
+    }
+
+    /**
+     * Gets the value of the references property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getReferences() {
+        return references;
+    }
+
+    /**
+     * Sets the value of the references property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setReferences(String value) {
+        this.references = value;
+    }
+
+    /**
+     * Gets the value of the deleteCascade property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link Boolean }
+     *     
+     */
+    public Boolean isDeleteCascade() {
+        return deleteCascade;
+    }
+
+    /**
+     * Sets the value of the deleteCascade property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link Boolean }
+     *     
+     */
+    public void setDeleteCascade(Boolean value) {
+        this.deleteCascade = value;
+    }
+
+    /**
+     * Gets the value of the deferrable property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link Boolean }
+     *     
+     */
+    public Boolean isDeferrable() {
+        return deferrable;
+    }
+
+    /**
+     * Sets the value of the deferrable property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link Boolean }
+     *     
+     */
+    public void setDeferrable(Boolean value) {
+        this.deferrable = value;
+    }
+
+    /**
+     * Gets the value of the initiallyDeferred property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link Boolean }
+     *     
+     */
+    public Boolean isInitiallyDeferred() {
+        return initiallyDeferred;
+    }
+
+    /**
+     * Sets the value of the initiallyDeferred property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link Boolean }
+     *     
+     */
+    public void setInitiallyDeferred(Boolean value) {
+        this.initiallyDeferred = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/Configuration.java

@@ -0,0 +1,64 @@
+
+package com.avaje.ebean.dbmigration.migration;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.XmlElement;
+import javax.xml.bind.annotation.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;sequence>
+ *         &lt;element ref="{http://ebean-orm.github.io/xml/ns/dbmigration}defaultTablespace"/>
+ *       &lt;/sequence>
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "", propOrder = {
+    "defaultTablespace"
+})
+@XmlRootElement(name = "configuration")
+public class Configuration {
+
+    @XmlElement(required = true)
+    protected DefaultTablespace defaultTablespace;
+
+    /**
+     * Gets the value of the defaultTablespace property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link DefaultTablespace }
+     *     
+     */
+    public DefaultTablespace getDefaultTablespace() {
+        return defaultTablespace;
+    }
+
+    /**
+     * Sets the value of the defaultTablespace property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link DefaultTablespace }
+     *     
+     */
+    public void setDefaultTablespace(DefaultTablespace value) {
+        this.defaultTablespace = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/CreateDropHistoryTable.java

@@ -0,0 +1,60 @@
+
+package com.avaje.ebean.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.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;attribute name="baseTable" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "")
+@XmlRootElement(name = "createDropHistoryTable", namespace = "http://ebean-orm.github.io/xml/ns/dbmigration")
+public class CreateDropHistoryTable {
+
+    @XmlAttribute(name = "baseTable", required = true)
+    protected String baseTable;
+
+    /**
+     * Gets the value of the baseTable property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getBaseTable() {
+        return baseTable;
+    }
+
+    /**
+     * Sets the value of the baseTable property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setBaseTable(String value) {
+        this.baseTable = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/CreateHistoryTable.java

@@ -0,0 +1,60 @@
+
+package com.avaje.ebean.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.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;attribute name="baseTable" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "")
+@XmlRootElement(name = "addHistoryTable")
+public class CreateHistoryTable {
+
+    @XmlAttribute(name = "baseTable", required = true)
+    protected String baseTable;
+
+    /**
+     * Gets the value of the baseTable property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getBaseTable() {
+        return baseTable;
+    }
+
+    /**
+     * Sets the value of the baseTable property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setBaseTable(String value) {
+        this.baseTable = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/CreateTable.java

@@ -0,0 +1,237 @@
+
+package com.avaje.ebean.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;
+import java.util.List;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;sequence>
+ *         &lt;element ref="{http://ebean-orm.github.io/xml/ns/dbmigration}column" maxOccurs="unbounded"/>
+ *         &lt;element ref="{http://ebean-orm.github.io/xml/ns/dbmigration}uniqueConstraint" maxOccurs="unbounded" minOccurs="0"/>
+ *       &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="withHistory" type="{http://www.w3.org/2001/XMLSchema}boolean" />
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "", propOrder = {
+    "column",
+    "uniqueConstraint"
+})
+@XmlRootElement(name = "createTable")
+public class CreateTable {
+
+    @XmlElement(required = true)
+    protected List<Column> column;
+    protected List<UniqueConstraint> uniqueConstraint;
+    @XmlAttribute(name = "name", required = true)
+    protected String name;
+    @XmlAttribute(name = "withHistory")
+    protected Boolean withHistory;
+    @XmlAttribute(name = "tablespace")
+    protected String tablespace;
+    @XmlAttribute(name = "indexTablespace")
+    protected String indexTablespace;
+    @XmlAttribute(name = "remarks")
+    protected String remarks;
+
+    /**
+     * Gets the value of the column 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 column property.
+     * 
+     * <p>
+     * For example, to add a new item, do as follows:
+     * <pre>
+     *    getColumn().add(newItem);
+     * </pre>
+     * 
+     * 
+     * <p>
+     * Objects of the following type(s) are allowed in the list
+     * {@link Column }
+     * 
+     * 
+     */
+    public List<Column> getColumn() {
+        if (column == null) {
+            column = new ArrayList<Column>();
+        }
+        return this.column;
+    }
+
+    /**
+     * Gets the value of the uniqueConstraint 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 uniqueConstraint property.
+     * 
+     * <p>
+     * For example, to add a new item, do as follows:
+     * <pre>
+     *    getUniqueConstraint().add(newItem);
+     * </pre>
+     * 
+     * 
+     * <p>
+     * Objects of the following type(s) are allowed in the list
+     * {@link UniqueConstraint }
+     * 
+     * 
+     */
+    public List<UniqueConstraint> getUniqueConstraint() {
+        if (uniqueConstraint == null) {
+            uniqueConstraint = new ArrayList<UniqueConstraint>();
+        }
+        return this.uniqueConstraint;
+    }
+
+    /**
+     * Gets the value of the name property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * Sets the value of the name property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setName(String value) {
+        this.name = value;
+    }
+
+    /**
+     * Gets the value of the withHistory property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link Boolean }
+     *     
+     */
+    public Boolean isWithHistory() {
+        return withHistory;
+    }
+
+    /**
+     * Sets the value of the withHistory property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link Boolean }
+     *     
+     */
+    public void setWithHistory(Boolean value) {
+        this.withHistory = value;
+    }
+
+    /**
+     * Gets the value of the tablespace property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getTablespace() {
+        return tablespace;
+    }
+
+    /**
+     * Sets the value of the tablespace property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setTablespace(String value) {
+        this.tablespace = value;
+    }
+
+    /**
+     * Gets the value of the indexTablespace property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getIndexTablespace() {
+        return indexTablespace;
+    }
+
+    /**
+     * Sets the value of the indexTablespace property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setIndexTablespace(String value) {
+        this.indexTablespace = value;
+    }
+
+    /**
+     * Gets the value of the remarks property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getRemarks() {
+        return remarks;
+    }
+
+    /**
+     * Sets the value of the remarks property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setRemarks(String value) {
+        this.remarks = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/CreateView.java

@@ -0,0 +1,116 @@
+
+package com.avaje.ebean.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.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+import javax.xml.bind.annotation.XmlValue;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;simpleContent>
+ *     &lt;extension base="&lt;http://www.w3.org/2001/XMLSchema>string">
+ *       &lt;attribute name="name" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="replaceIfExists" type="{http://www.w3.org/2001/XMLSchema}boolean" />
+ *     &lt;/extension>
+ *   &lt;/simpleContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "", propOrder = {
+    "value"
+})
+@XmlRootElement(name = "createView")
+public class CreateView {
+
+    @XmlValue
+    protected String value;
+    @XmlAttribute(name = "name", required = true)
+    protected String name;
+    @XmlAttribute(name = "replaceIfExists")
+    protected Boolean replaceIfExists;
+
+    /**
+     * Gets the value of the value property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getValue() {
+        return value;
+    }
+
+    /**
+     * Sets the value of the value property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setValue(String value) {
+        this.value = value;
+    }
+
+    /**
+     * Gets the value of the name property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * Sets the value of the name property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setName(String value) {
+        this.name = value;
+    }
+
+    /**
+     * Gets the value of the replaceIfExists property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link Boolean }
+     *     
+     */
+    public Boolean isReplaceIfExists() {
+        return replaceIfExists;
+    }
+
+    /**
+     * Sets the value of the replaceIfExists property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link Boolean }
+     *     
+     */
+    public void setReplaceIfExists(Boolean value) {
+        this.replaceIfExists = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/DefaultTablespace.java

@@ -0,0 +1,114 @@
+
+package com.avaje.ebean.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.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;attribute name="tables" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="indexes" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="history" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "")
+@XmlRootElement(name = "defaultTablespace")
+public class DefaultTablespace {
+
+    @XmlAttribute(name = "tables")
+    protected String tables;
+    @XmlAttribute(name = "indexes")
+    protected String indexes;
+    @XmlAttribute(name = "history")
+    protected String history;
+
+    /**
+     * Gets the value of the tables property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getTables() {
+        return tables;
+    }
+
+    /**
+     * Sets the value of the tables property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setTables(String value) {
+        this.tables = value;
+    }
+
+    /**
+     * Gets the value of the indexes property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getIndexes() {
+        return indexes;
+    }
+
+    /**
+     * Sets the value of the indexes property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setIndexes(String value) {
+        this.indexes = value;
+    }
+
+    /**
+     * Gets the value of the history property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getHistory() {
+        return history;
+    }
+
+    /**
+     * Sets the value of the history property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setHistory(String value) {
+        this.history = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/DropColumn.java

@@ -0,0 +1,87 @@
+
+package com.avaje.ebean.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.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &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;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "")
+@XmlRootElement(name = "dropColumn")
+public class DropColumn {
+
+    @XmlAttribute(name = "columnName", required = true)
+    protected String columnName;
+    @XmlAttribute(name = "tableName", required = true)
+    protected String tableName;
+
+    /**
+     * Gets the value of the columnName property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getColumnName() {
+        return columnName;
+    }
+
+    /**
+     * Sets the value of the columnName property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setColumnName(String value) {
+        this.columnName = value;
+    }
+
+    /**
+     * Gets the value of the tableName property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getTableName() {
+        return tableName;
+    }
+
+    /**
+     * Sets the value of the tableName property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setTableName(String value) {
+        this.tableName = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/DropForeignKey.java

@@ -0,0 +1,89 @@
+
+package com.avaje.ebean.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.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+import javax.xml.bind.annotation.XmlValue;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <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;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "", propOrder = {
+    "content"
+})
+@XmlRootElement(name = "dropForeignKey")
+public class DropForeignKey {
+
+    @XmlValue
+    protected String content;
+    @XmlAttribute(name = "name", required = true)
+    protected String name;
+
+    /**
+     * Gets the value of the content property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getContent() {
+        return content;
+    }
+
+    /**
+     * Sets the value of the content property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setContent(String value) {
+        this.content = value;
+    }
+
+    /**
+     * Gets the value of the name property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * Sets the value of the name property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setName(String value) {
+        this.name = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/DropHistoryTable.java

@@ -0,0 +1,60 @@
+
+package com.avaje.ebean.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.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;attribute name="baseTable" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "")
+@XmlRootElement(name = "dropHistoryTable")
+public class DropHistoryTable {
+
+    @XmlAttribute(name = "baseTable", required = true)
+    protected String baseTable;
+
+    /**
+     * Gets the value of the baseTable property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getBaseTable() {
+        return baseTable;
+    }
+
+    /**
+     * Sets the value of the baseTable property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setBaseTable(String value) {
+        this.baseTable = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/DropTable.java

@@ -0,0 +1,60 @@
+
+package com.avaje.ebean.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.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <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;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "")
+@XmlRootElement(name = "dropTable")
+public class DropTable {
+
+    @XmlAttribute(name = "name", required = true)
+    protected String name;
+
+    /**
+     * Gets the value of the name property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * Sets the value of the name property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setName(String value) {
+        this.name = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/DropView.java

@@ -0,0 +1,60 @@
+
+package com.avaje.ebean.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.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <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;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "")
+@XmlRootElement(name = "dropView")
+public class DropView {
+
+    @XmlAttribute(name = "name", required = true)
+    protected String name;
+
+    /**
+     * Gets the value of the name property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * Sets the value of the name property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setName(String value) {
+        this.name = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/Migration.java

@@ -0,0 +1,71 @@
+
+package com.avaje.ebean.dbmigration.migration;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.XmlElement;
+import javax.xml.bind.annotation.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+import java.util.ArrayList;
+import java.util.List;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;sequence>
+ *         &lt;element ref="{http://ebean-orm.github.io/xml/ns/dbmigration}changeSet" maxOccurs="unbounded"/>
+ *       &lt;/sequence>
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "", propOrder = {
+    "changeSet"
+})
+@XmlRootElement(name = "migration")
+public class Migration {
+
+    @XmlElement(required = true)
+    protected List<ChangeSet> changeSet;
+
+    /**
+     * Gets the value of the changeSet 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 changeSet property.
+     * 
+     * <p>
+     * For example, to add a new item, do as follows:
+     * <pre>
+     *    getChangeSet().add(newItem);
+     * </pre>
+     * 
+     * 
+     * <p>
+     * Objects of the following type(s) are allowed in the list
+     * {@link ChangeSet }
+     * 
+     * 
+     */
+    public List<ChangeSet> getChangeSet() {
+        if (changeSet == null) {
+            changeSet = new ArrayList<ChangeSet>();
+        }
+        return this.changeSet;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/ObjectFactory.java

@@ -0,0 +1,224 @@
+
+package com.avaje.ebean.dbmigration.migration;
+
+import javax.xml.bind.annotation.XmlRegistry;
+
+
+/**
+ * This object contains factory methods for each 
+ * Java content interface and Java element interface 
+ * generated in the org.avaje.ebean.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 
+ * content can consist of schema derived interfaces 
+ * and classes representing the binding of schema 
+ * type definitions, element declarations and model 
+ * groups.  Factory methods for each of these are 
+ * provided in this class.
+ * 
+ */
+@XmlRegistry
+public class ObjectFactory {
+
+
+    /**
+     * Create a new ObjectFactory that can be used to create new instances of schema derived classes for package: org.avaje.ebean.dbmigration.migration
+     * 
+     */
+    public ObjectFactory() {
+    }
+
+    /**
+     * Create an instance of {@link Rollback }
+     * 
+     */
+    public Rollback createRollback() {
+        return new Rollback();
+    }
+
+    /**
+     * Create an instance of {@link AddColumn }
+     * 
+     */
+    public AddColumn createAddColumn() {
+        return new AddColumn();
+    }
+
+    /**
+     * Create an instance of {@link Column }
+     * 
+     */
+    public Column createColumn() {
+        return new Column();
+    }
+
+    /**
+     * Create an instance of {@link CreateTable }
+     * 
+     */
+    public CreateTable createCreateTable() {
+        return new CreateTable();
+    }
+
+    /**
+     * Create an instance of {@link UniqueConstraint }
+     * 
+     */
+    public UniqueConstraint createUniqueConstraint() {
+        return new UniqueConstraint();
+    }
+
+    /**
+     * Create an instance of {@link DropForeignKey }
+     * 
+     */
+    public DropForeignKey createDropForeignKey() {
+        return new DropForeignKey();
+    }
+
+    /**
+     * Create an instance of {@link Apply }
+     * 
+     */
+    public Apply createApply() {
+        return new Apply();
+    }
+
+    /**
+     * Create an instance of {@link Configuration }
+     * 
+     */
+    public Configuration createConfiguration() {
+        return new Configuration();
+    }
+
+    /**
+     * Create an instance of {@link DefaultTablespace }
+     * 
+     */
+    public DefaultTablespace createDefaultTablespace() {
+        return new DefaultTablespace();
+    }
+
+    /**
+     * Create an instance of {@link RenameTable }
+     * 
+     */
+    public RenameTable createRenameTable() {
+        return new RenameTable();
+    }
+
+    /**
+     * Create an instance of {@link DropHistoryTable }
+     * 
+     */
+    public DropHistoryTable createDropHistoryTable() {
+        return new DropHistoryTable();
+    }
+
+    /**
+     * Create an instance of {@link RenameView }
+     * 
+     */
+    public RenameView createRenameView() {
+        return new RenameView();
+    }
+
+    /**
+     * Create an instance of {@link AddForeignKey }
+     * 
+     */
+    public AddForeignKey createAddForeignKey() {
+        return new AddForeignKey();
+    }
+
+    /**
+     * Create an instance of {@link DropColumn }
+     * 
+     */
+    public DropColumn createDropColumn() {
+        return new DropColumn();
+    }
+
+    /**
+     * Create an instance of {@link DropView }
+     * 
+     */
+    public DropView createDropView() {
+        return new DropView();
+    }
+
+    /**
+     * Create an instance of {@link ChangeSet }
+     * 
+     */
+    public ChangeSet createChangeSet() {
+        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 CreateHistoryTable }
+     * 
+     */
+    public CreateHistoryTable createCreateHistoryTable() {
+        return new CreateHistoryTable();
+    }
+
+    /**
+     * Create an instance of {@link CreateView }
+     * 
+     */
+    public CreateView createCreateView() {
+        return new CreateView();
+    }
+
+    /**
+     * Create an instance of {@link RenameColumn }
+     * 
+     */
+    public RenameColumn createRenameColumn() {
+        return new RenameColumn();
+    }
+
+    /**
+     * Create an instance of {@link Application }
+     * 
+     */
+    public Application createApplication() {
+        return new Application();
+    }
+
+    /**
+     * Create an instance of {@link Migration }
+     * 
+     */
+    public Migration createMigration() {
+        return new Migration();
+    }
+
+    /**
+     * Create an instance of {@link Applications }
+     * 
+     */
+    public Applications createApplications() {
+        return new Applications();
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/RenameColumn.java

@@ -0,0 +1,141 @@
+
+package com.avaje.ebean.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.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;attribute name="oldName" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="newName" 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="dataType" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "")
+@XmlRootElement(name = "renameColumn")
+public class RenameColumn {
+
+    @XmlAttribute(name = "oldName", required = true)
+    protected String oldName;
+    @XmlAttribute(name = "newName", required = true)
+    protected String newName;
+    @XmlAttribute(name = "tableName", required = true)
+    protected String tableName;
+    @XmlAttribute(name = "dataType")
+    protected String dataType;
+
+    /**
+     * Gets the value of the oldName property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getOldName() {
+        return oldName;
+    }
+
+    /**
+     * Sets the value of the oldName property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setOldName(String value) {
+        this.oldName = value;
+    }
+
+    /**
+     * Gets the value of the newName property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getNewName() {
+        return newName;
+    }
+
+    /**
+     * Sets the value of the newName property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setNewName(String value) {
+        this.newName = value;
+    }
+
+    /**
+     * Gets the value of the tableName property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getTableName() {
+        return tableName;
+    }
+
+    /**
+     * Sets the value of the tableName property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setTableName(String value) {
+        this.tableName = value;
+    }
+
+    /**
+     * Gets the value of the dataType property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getDataType() {
+        return dataType;
+    }
+
+    /**
+     * Sets the value of the dataType property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setDataType(String value) {
+        this.dataType = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/RenameTable.java

@@ -0,0 +1,87 @@
+
+package com.avaje.ebean.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.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;attribute name="oldName" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="newName" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "")
+@XmlRootElement(name = "renameTable")
+public class RenameTable {
+
+    @XmlAttribute(name = "oldName", required = true)
+    protected String oldName;
+    @XmlAttribute(name = "newName", required = true)
+    protected String newName;
+
+    /**
+     * Gets the value of the oldName property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getOldName() {
+        return oldName;
+    }
+
+    /**
+     * Sets the value of the oldName property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setOldName(String value) {
+        this.oldName = value;
+    }
+
+    /**
+     * Gets the value of the newName property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getNewName() {
+        return newName;
+    }
+
+    /**
+     * Sets the value of the newName property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setNewName(String value) {
+        this.newName = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/RenameView.java

@@ -0,0 +1,87 @@
+
+package com.avaje.ebean.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.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;attribute name="oldName" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="newName" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "")
+@XmlRootElement(name = "renameView")
+public class RenameView {
+
+    @XmlAttribute(name = "oldName", required = true)
+    protected String oldName;
+    @XmlAttribute(name = "newName", required = true)
+    protected String newName;
+
+    /**
+     * Gets the value of the oldName property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getOldName() {
+        return oldName;
+    }
+
+    /**
+     * Sets the value of the oldName property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setOldName(String value) {
+        this.oldName = value;
+    }
+
+    /**
+     * Gets the value of the newName property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getNewName() {
+        return newName;
+    }
+
+    /**
+     * Sets the value of the newName property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setNewName(String value) {
+        this.newName = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/Rollback.java

@@ -0,0 +1,61 @@
+
+package com.avaje.ebean.dbmigration.migration;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+import javax.xml.bind.annotation.XmlValue;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;simpleContent>
+ *     &lt;extension base="&lt;http://www.w3.org/2001/XMLSchema>string">
+ *     &lt;/extension>
+ *   &lt;/simpleContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "", propOrder = {
+    "value"
+})
+@XmlRootElement(name = "rollback")
+public class Rollback {
+
+    @XmlValue
+    protected String value;
+
+    /**
+     * Gets the value of the value property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getValue() {
+        return value;
+    }
+
+    /**
+     * Sets the value of the value property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setValue(String value) {
+        this.value = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/Sql.java

@@ -0,0 +1,92 @@
+
+package com.avaje.ebean.dbmigration.migration;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+import javax.xml.bind.annotation.XmlElement;
+import javax.xml.bind.annotation.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;sequence>
+ *         &lt;element ref="{http://ebean-orm.github.io/xml/ns/dbmigration}apply"/>
+ *         &lt;element ref="{http://ebean-orm.github.io/xml/ns/dbmigration}rollback"/>
+ *       &lt;/sequence>
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "", propOrder = {
+    "apply",
+    "rollback"
+})
+@XmlRootElement(name = "sql")
+public class Sql {
+
+    @XmlElement(required = true)
+    protected Apply apply;
+    @XmlElement(required = true)
+    protected Rollback rollback;
+
+    /**
+     * Gets the value of the apply property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link Apply }
+     *     
+     */
+    public Apply getApply() {
+        return apply;
+    }
+
+    /**
+     * Sets the value of the apply property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link Apply }
+     *     
+     */
+    public void setApply(Apply value) {
+        this.apply = value;
+    }
+
+    /**
+     * Gets the value of the rollback property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link Rollback }
+     *     
+     */
+    public Rollback getRollback() {
+        return rollback;
+    }
+
+    /**
+     * Sets the value of the rollback property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link Rollback }
+     *     
+     */
+    public void setRollback(Rollback value) {
+        this.rollback = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/UniqueConstraint.java

@@ -0,0 +1,87 @@
+
+package com.avaje.ebean.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.XmlRootElement;
+import javax.xml.bind.annotation.XmlType;
+
+
+/**
+ * <p>Java class for anonymous complex type.
+ * 
+ * <p>The following schema fragment specifies the expected content contained within this class.
+ * 
+ * <pre>
+ * &lt;complexType>
+ *   &lt;complexContent>
+ *     &lt;restriction base="{http://www.w3.org/2001/XMLSchema}anyType">
+ *       &lt;attribute name="columnNames" use="required" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *       &lt;attribute name="constraintName" type="{http://www.w3.org/2001/XMLSchema}string" />
+ *     &lt;/restriction>
+ *   &lt;/complexContent>
+ * &lt;/complexType>
+ * </pre>
+ * 
+ * 
+ */
+@XmlAccessorType(XmlAccessType.FIELD)
+@XmlType(name = "")
+@XmlRootElement(name = "uniqueConstraint")
+public class UniqueConstraint {
+
+    @XmlAttribute(name = "columnNames", required = true)
+    protected String columnNames;
+    @XmlAttribute(name = "constraintName")
+    protected String constraintName;
+
+    /**
+     * Gets the value of the columnNames property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getColumnNames() {
+        return columnNames;
+    }
+
+    /**
+     * Sets the value of the columnNames property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setColumnNames(String value) {
+        this.columnNames = value;
+    }
+
+    /**
+     * Gets the value of the constraintName property.
+     * 
+     * @return
+     *     possible object is
+     *     {@link String }
+     *     
+     */
+    public String getConstraintName() {
+        return constraintName;
+    }
+
+    /**
+     * Sets the value of the constraintName property.
+     * 
+     * @param value
+     *     allowed object is
+     *     {@link String }
+     *     
+     */
+    public void setConstraintName(String value) {
+        this.constraintName = value;
+    }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migration/package-info.java

@@ -0,0 +1,2 @@
+@javax.xml.bind.annotation.XmlSchema(namespace = "http://ebean-orm.github.io/xml/ns/dbmigration", elementFormDefault = javax.xml.bind.annotation.XmlNsForm.QUALIFIED)
+package com.avaje.ebean.dbmigration.migration;

src/main/java/com/avaje/ebean/dbmigration/migrationreader/MigrationXmlReader.java

@@ -0,0 +1,46 @@
+package com.avaje.ebean.dbmigration.migrationreader;
+
+
+import com.avaje.ebean.dbmigration.migration.Migration;
+
+import javax.xml.bind.JAXBContext;
+import javax.xml.bind.JAXBException;
+import javax.xml.bind.Unmarshaller;
+import java.io.InputStream;
+
+/**
+ * Reads a migration xml document returning the Migration.
+ */
+public class MigrationXmlReader {
+
+  private static final MigrationXmlReader INSTANCE = new MigrationXmlReader();
+
+  /**
+   * Read and return a Migration from an xml document at the given resource path.
+   */
+  public static Migration read(String resourcePath) {
+
+    InputStream is = MigrationXmlReader.class.getResourceAsStream(resourcePath);
+    if (is == null) {
+      throw new IllegalArgumentException("No resource found for path [" + resourcePath + "]");
+    }
+
+    return INSTANCE.read(is);
+  }
+
+  /**
+   * Read and return a Migration from an xml document.
+   */
+  public Migration read(InputStream is) {
+
+    try {
+      JAXBContext jaxbContext = JAXBContext.newInstance(Migration.class);
+      Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
+      return (Migration) unmarshaller.unmarshal(is);
+
+    } catch (JAXBException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+}

src/main/java/com/avaje/ebean/dbmigration/migrationreader/MigrationXmlWriter.java

@@ -0,0 +1,32 @@
+package com.avaje.ebean.dbmigration.migrationreader;
+
+
+import com.avaje.ebean.dbmigration.migration.Migration;
+
+import javax.xml.bind.JAXBContext;
+import javax.xml.bind.JAXBException;
+import javax.xml.bind.Marshaller;
+import java.io.File;
+
+/**
+ * Simple writer for output of the Migration/ChangeSet as an XML document.
+ */
+public class MigrationXmlWriter {
+
+  /**
+   * Write a Migration to a file as an xml document to the file.
+   */
+  public void write(Migration migration, File file) {
+
+    try {
+      JAXBContext jaxbContext = JAXBContext.newInstance(Migration.class);
+      Marshaller marshaller = jaxbContext.createMarshaller();
+      marshaller.setProperty( Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
+      marshaller.marshal(migration, file);
+
+    } catch (JAXBException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+}

src/main/java/com/avaje/ebean/dbmigration/model/CurrentModel.java

@@ -0,0 +1,130 @@
+package com.avaje.ebean.dbmigration.model;
+
+import com.avaje.ebean.config.dbplatform.DatabasePlatform;
+import com.avaje.ebean.config.dbplatform.DbTypeMap;
+import com.avaje.ebean.config.dbplatform.PostgresPlatform;
+import com.avaje.ebean.dbmigration.ddlgeneration.BaseDdlHandler;
+import com.avaje.ebean.dbmigration.ddlgeneration.DdlWrite;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.DdlNamingConvention;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.PlatformDdl;
+import com.avaje.ebean.dbmigration.ddlgeneration.platform.PostgresDdl;
+import com.avaje.ebean.dbmigration.migration.ChangeSet;
+import com.avaje.ebean.dbmigration.migration.Migration;
+import com.avaje.ebean.dbmigration.migrationreader.MigrationXmlWriter;
+import com.avaje.ebean.dbmigration.model.build.ModelBuildBeanVisitor;
+import com.avaje.ebean.dbmigration.model.build.ModelBuildContext;
+import com.avaje.ebean.dbmigration.model.visitor.VisitAllUsing;
+import com.avaje.ebeaninternal.api.SpiEbeanServer;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.List;
+
+/**
+ * Reads EbeanServer bean descriptors to build the current model.
+ */
+public class CurrentModel {
+
+  private final SpiEbeanServer server;
+
+  private DdlNamingConvention namingConvention;
+
+  private ModelContainer model;
+  private ChangeSet changeSet;
+  private DdlWrite write;
+
+  public CurrentModel(SpiEbeanServer server) {
+    this.server = server;
+    this.namingConvention = new DdlNamingConvention();
+  }
+
+  public ModelContainer read() {
+    if (model == null) {
+      model = new ModelContainer();
+      ModelBuildContext context = new ModelBuildContext(model);
+      ModelBuildBeanVisitor visitor = new ModelBuildBeanVisitor(context);
+      VisitAllUsing visit = new VisitAllUsing(visitor, server);
+      visit.visitAllBeans();
+    }
+    return model;
+  }
+
+  public ChangeSet getChangeSet() {
+    read();
+    if (changeSet == null) {
+      changeSet = asChangeSet();
+    }
+    return changeSet;
+  }
+
+  public void writeMigration(File file) {
+
+    ChangeSet changeSet = getChangeSet();
+    Migration migration = new Migration();
+    migration.getChangeSet().add(changeSet);
+
+    MigrationXmlWriter writer = new MigrationXmlWriter();
+    writer.write(migration, file);
+  }
+
+  public String getCreateDdl() throws IOException {
+
+    createDdl();
+
+    StringBuilder ddl = new StringBuilder(2000);
+    ddl.append(write.apply().getBuffer());
+    ddl.append(write.applyForeignKeys().getBuffer());
+    ddl.append(write.applyHistory().getBuffer());
+
+    return ddl.toString();
+  }
+
+  public String getDropDdl() throws IOException {
+
+    createDdl();
+
+    StringBuilder ddl = new StringBuilder(2000);
+    ddl.append(write.rollbackForeignKeys().getBuffer());
+    ddl.append(write.rollback().getBuffer());
+
+    return ddl.toString();
+  }
+
+  private void createDdl() throws IOException {
+
+    if (write == null) {
+      ChangeSet createChangeSet = getChangeSet();
+
+      write = new DdlWrite();
+
+      BaseDdlHandler handler = handler();
+      handler.generate(write, createChangeSet);
+    }
+  }
+
+  private BaseDdlHandler handler() {
+
+    DatabasePlatform databasePlatform = server.getDatabasePlatform();
+    PlatformDdl platformDdl = databasePlatform.getPlatformDdl();
+
+    return new BaseDdlHandler(namingConvention, platformDdl);
+  }
+
+  /**
+   * Convert the model into a ChangeSet.
+   */
+  private ChangeSet asChangeSet() {
+
+    // empty diff so changes will effectively all be create
+    ModelDiff diff = new ModelDiff();
+    diff.compareTo(model);
+
+    List<Object> createChanges = diff.getCreateChanges();
+
+    // put the changes into a ChangeSet
+    ChangeSet createChangeSet = new ChangeSet();
+    createChangeSet.getChangeSetChildren().addAll(createChanges);
+    return createChangeSet;
+  }
+
+}

src/main/java/com/avaje/ebean/dbmigration/model/MColumn.java

@@ -0,0 +1,125 @@
+package com.avaje.ebean.dbmigration.model;
+
+import com.avaje.ebean.dbmigration.migration.Column;
+
+/**
+ * A column in the logical model.
+ */
+public class MColumn {
+
+  private final String name;
+  private final String type;
+  private String checkConstraint;
+  private String defaultValue;
+  private String references;
+  private boolean notnull;
+  private boolean primaryKey;
+  private boolean identity;
+  private boolean unique;
+
+  public MColumn(Column column) {
+    this.name = column.getName();
+    this.type = column.getType();
+    this.checkConstraint = column.getCheckConstraint();
+    this.defaultValue = column.getDefaultValue();
+    this.references = column.getReferences();
+    this.notnull = Boolean.TRUE.equals(column.isNotnull());
+    this.primaryKey = Boolean.TRUE.equals(column.isPrimaryKey());
+    this.identity = Boolean.TRUE.equals(column.isIdentity());
+    this.unique = Boolean.TRUE.equals(column.isUnique());
+  }
+
+  public MColumn(String name, String type) {
+    this.name = name;
+    this.type = type;
+  }
+
+  public MColumn(String name, String type, boolean notnull) {
+    this.name = name;
+    this.type = type;
+    this.notnull = notnull;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getType() {
+    return type;
+  }
+
+  public boolean isPrimaryKey() {
+    return primaryKey;
+  }
+
+  public void setPrimaryKey(boolean primaryKey) {
+    this.primaryKey = primaryKey;
+  }
+
+  public boolean isIdentity() {
+    return identity;
+  }
+
+  public void setIdentity(boolean identity) {
+    this.identity = identity;
+  }
+
+  public String getCheckConstraint() {
+    return checkConstraint;
+  }
+
+  public void setCheckConstraint(String checkConstraint) {
+    this.checkConstraint = checkConstraint;
+  }
+
+  public String getDefaultValue() {
+    return defaultValue;
+  }
+
+  public void setDefaultValue(String defaultValue) {
+    this.defaultValue = defaultValue;
+  }
+
+  public String getReferences() {
+    return references;
+  }
+
+  public void setReferences(String references) {
+    this.references = references;
+  }
+
+  public boolean isNotnull() {
+    return notnull;
+  }
+
+  public void setNotnull(boolean notnull) {
+    this.notnull = notnull;
+  }
+
+  public void setUnique(boolean unique) {
+    this.unique = unique;
+  }
+
+  public boolean isUnique() {
+    return unique;
+  }
+
+  public Column createColumn() {
+
+    Column c = new Column();
+    c.setName(name);
+    c.setType(type);
+    c.setNotnull(notnull);
+    c.setCheckConstraint(checkConstraint);
+    c.setUnique(unique);
+    c.setPrimaryKey(primaryKey);
+    c.setIdentity(identity);
+    c.setReferences(references);
+    c.setDefaultValue(defaultValue);
+
+    //c.setDeleteCascade();
+    //c.setDeferrable(deferrable);
+
+    return c;
+  }
+}

src/main/java/com/avaje/ebean/dbmigration/model/MCompoundForeignKey.java

@@ -0,0 +1,27 @@
+package com.avaje.ebean.dbmigration.model;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A unique constraint for multiple columns.
+ * <p>
+ *   Note that unique constraint on a single column is instead
+ *   a boolean flag on the associated MColumn.
+ * </p>
+ */
+public class MCompoundForeignKey {
+
+  private final String referenceTable;
+  private final List<String> columns = new ArrayList<String>();
+  private final List<String> referenceColumns = new ArrayList<String>();
+
+  public MCompoundForeignKey(String referenceTable) {
+    this.referenceTable = referenceTable;
+  }
+
+  public void addColumnPair(String dbCol, String refColumn) {
+    columns.add(dbCol);
+    referenceColumns.add(refColumn);
+  }
+}

src/main/java/com/avaje/ebean/dbmigration/model/MCompoundUniqueConstraint.java

@@ -0,0 +1,24 @@
+package com.avaje.ebean.dbmigration.model;
+
+/**
+ * A unique constraint for multiple columns.
+ * <p>
+ *   Note that unique constraint on a single column is instead
+ *   a boolean flag on the associated MColumn.
+ * </p>
+ */
+public class MCompoundUniqueConstraint {
+
+  /**
+   * The columns combined to be unique.
+   */
+  private final String[] columns;
+
+  public MCompoundUniqueConstraint(String[] columns) {
+    this.columns = columns;
+  }
+
+  public String[] getColumns() {
+    return columns;
+  }
+}

src/main/java/com/avaje/ebean/dbmigration/model/MConfiguration.java

@@ -0,0 +1,77 @@
+package com.avaje.ebean.dbmigration.model;
+
+import com.avaje.ebean.dbmigration.migration.Configuration;
+import com.avaje.ebean.dbmigration.migration.DefaultTablespace;
+
+/**
+ * Holds configuration such as the default tablespaces to use for tables,
+ * indexes, history tables etc.
+ */
+public class MConfiguration {
+
+  /**
+   * Default tablespace for tables.
+   */
+  protected String tableTablespace;
+
+  /**
+   * Default tablespace for indexes.
+   */
+  protected String indexTablespace;
+
+  /**
+   * Default tablespace for history tables.
+   */
+  protected String historyTablespace;
+
+  /**
+   * Apply the migration configuration.
+   * <p>
+   *   It is expected that these are applied in the correct chronological order
+   *   from earliest to latest.
+   * </p>
+   */
+  public void apply(Configuration configuration) {
+
+    DefaultTablespace defaultTablespace = configuration.getDefaultTablespace();
+    if (defaultTablespace != null) {
+      String tables = defaultTablespace.getTables();
+      if (isNotEmpty(tables)) {
+        this.tableTablespace = tables;
+      }
+      String indexes = defaultTablespace.getIndexes();
+      if (isNotEmpty(indexes)) {
+        this.indexTablespace = indexes;
+      }
+      String history = defaultTablespace.getHistory();
+      if (isNotEmpty(history)) {
+        this.historyTablespace = history;
+      }
+    }
+  }
+
+  /**
+   * Return the default tablespace to use for tables.
+   */
+  public String getTableTablespace() {
+    return tableTablespace;
+  }
+
+  /**
+   * Return the default tablespace to use for indexes.
+   */
+  public String getIndexTablespace() {
+    return indexTablespace;
+  }
+
+  /**
+   * Return the default tablespace to use for history tables.
+   */
+  public String getHistoryTablespace() {
+    return historyTablespace;
+  }
+
+  protected boolean isNotEmpty(String tables) {
+    return tables != null && !tables.trim().isEmpty();
+  }
+}

src/main/java/com/avaje/ebean/dbmigration/model/MIndex.java

@@ -0,0 +1,7 @@
+package com.avaje.ebean.dbmigration.model;
+
+/**
+ * Index as part of the logical model.
+ */
+public class MIndex {
+}

src/main/java/com/avaje/ebean/dbmigration/model/MTable.java

@@ -0,0 +1,186 @@
+package com.avaje.ebean.dbmigration.model;
+
+import com.avaje.ebean.dbmigration.migration.AddColumn;
+import com.avaje.ebean.dbmigration.migration.Column;
+import com.avaje.ebean.dbmigration.migration.CreateTable;
+import com.avaje.ebean.dbmigration.migration.DropColumn;
+
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Holds the logical model for a given Table and everything associated to it.
+ * <p>
+ *   This effectively represents a table, its columns and all associated
+ *   constraints, foreign keys and indexes.
+ * </p>
+ * <p>
+ *   Migrations can be applied to this such that it represents the state
+ *   of a given table after various migrations have been applied.
+ * </p>
+ * <p>
+ *   This table model can also be derived from the EbeanServer bean descriptor
+ *   and associated properties.
+ * </p>
+ */
+public class MTable {
+
+  /**
+   * Flag set to indicate
+   */
+  private boolean matched;
+
+  private final String name;
+
+  private String remarks;
+
+  private String tablespace;
+
+  private String indexTablespace;
+
+  private Boolean withHistory;
+
+  private Map<String,MColumn> columns = new LinkedHashMap<String,MColumn>();
+
+  private List<MCompoundUniqueConstraint> compoundUniqueConstraints = new ArrayList<MCompoundUniqueConstraint>();
+
+  private List<MCompoundForeignKey> compoundKeys = new ArrayList<MCompoundForeignKey>();
+  /**
+   * Construct for migration.
+   */
+  public MTable(CreateTable createTable) {
+    this.name = createTable.getName();
+    this.remarks = createTable.getRemarks();
+    this.tablespace = createTable.getTablespace();
+    this.indexTablespace = createTable.getIndexTablespace();
+    this.withHistory = createTable.isWithHistory();
+    List<Column> cols = createTable.getColumn();
+    for (Column column : cols) {
+      addColumn(column);
+    }
+  }
+
+  /**
+   * Construct typically from EbeanServer meta data.
+   */
+  public MTable(String name) {
+    this.name = name;
+  }
+
+  public CreateTable createTable() {
+
+    CreateTable createTable = new CreateTable();
+    createTable.setName(name);
+    createTable.setRemarks(remarks);
+    createTable.setTablespace(tablespace);
+    createTable.setIndexTablespace(indexTablespace);
+    createTable.setWithHistory(withHistory);
+
+    for (MColumn column : this.columns.values()) {
+      createTable.getColumn().add(column.createColumn());
+    }
+    return createTable;
+  }
+
+  public boolean isMatched() {
+    return matched;
+  }
+
+  public void setMatched(boolean matched) {
+    this.matched = matched;
+  }
+
+  /**
+   * Apply AddColumn migration.
+   */
+  public void apply(AddColumn addColumn) {
+    checkTableName(addColumn.getTableName());
+    for (Column column : addColumn.getColumn()) {
+      addColumn(column);
+    }
+  }
+
+  /**
+   * Apply DropColumn migration.
+   */
+  public void apply(DropColumn dropColumn) {
+    checkTableName(dropColumn.getTableName());
+    columns.remove(dropColumn.getColumnName());
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getRemarks() {
+    return remarks;
+  }
+
+  public String getTablespace() {
+    return tablespace;
+  }
+
+  public String getIndexTablespace() {
+    return indexTablespace;
+  }
+
+  public Boolean getWithHistory() {
+    return withHistory;
+  }
+
+  public Map<String, MColumn> getColumns() {
+    return columns;
+  }
+
+  public List<MCompoundUniqueConstraint> getCompoundUniqueConstraints() {
+    return compoundUniqueConstraints;
+  }
+
+  public List<MCompoundForeignKey> getCompoundKeys() {
+    return compoundKeys;
+  }
+
+  private void checkTableName(String tableName) {
+    if (!name.equals(tableName)) {
+      throw new IllegalArgumentException("addColumn tableName ["+tableName+"] does not match ["+name+"]");
+    }
+  }
+
+  /**
+   * Add a column via migration data.
+   */
+  private void addColumn(Column column) {
+    columns.put(column.getName(), new MColumn(column));
+  }
+
+  /**
+   * Add a model column (typically from EbeanServer meta data).
+   */
+  public void addColumn(MColumn column) {
+    columns.put(column.getName(), column);
+  }
+
+  /**
+   * Add a compound unique constraint.
+   */
+  public void addCompoundUniqueConstraint(String[] columns) {
+   compoundUniqueConstraints.add(new MCompoundUniqueConstraint(columns));
+  }
+
+  /**
+   * Add a compound unique constraint.
+   */
+  public void addCompoundUniqueConstraint(List<MColumn> columns) {
+    String[] cols = new String[columns.size()];
+    for (int i = 0; i < columns.size(); i++) {
+      cols[i] = columns.get(i).getName();
+    }
+    addCompoundUniqueConstraint(cols);
+  }
+
+  public void addForeignKey(MCompoundForeignKey compoundKey) {
+    compoundKeys.add(compoundKey);
+  }
+}

src/main/java/com/avaje/ebean/dbmigration/model/ModelContainer.java

@@ -0,0 +1,110 @@
+package com.avaje.ebean.dbmigration.model;
+
+import com.avaje.ebean.dbmigration.migration.AddColumn;
+import com.avaje.ebean.dbmigration.migration.ChangeSet;
+import com.avaje.ebean.dbmigration.migration.CreateTable;
+import com.avaje.ebean.dbmigration.migration.DropColumn;
+import com.avaje.ebean.dbmigration.migration.Migration;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Holds all the tables, views, indexes etc that represent the model.
+ * <p>
+ * Migration changeSets can be applied to the model.
+ * </p>
+ */
+public class ModelContainer {
+
+  /**
+   * All the tables in the model.
+   */
+  private Map<String, MTable> tables = new LinkedHashMap<String, MTable>();
+
+
+  /**
+   * Return the map of all the tables.
+   */
+  public Map<String, MTable> getTables() {
+    return tables;
+  }
+
+  /**
+   * Return the table by name.
+   */
+  public MTable getTable(String tableName) {
+    return tables.get(tableName);
+  }
+
+
+  /**
+   * Apply a migration with associated changeSets to the model.
+   */
+  public void apply(Migration migration) {
+
+    List<ChangeSet> changeSets = migration.getChangeSet();
+    for (ChangeSet changeSet : changeSets) {
+      applyChangeSet(changeSet);
+    }
+  }
+
+  /**
+   * Apply a changeSet to the model.
+   */
+  protected void applyChangeSet(ChangeSet changeSet) {
+
+    List<Object> changeSetChildren = changeSet.getChangeSetChildren();
+    for (Object change : changeSetChildren) {
+      if (change instanceof CreateTable) {
+        applyChange((CreateTable) change);
+      } else if (change instanceof AddColumn) {
+        applyChange((AddColumn) change);
+      } else if (change instanceof DropColumn) {
+        applyChange((DropColumn) change);
+      }
+    }
+  }
+
+  /**
+   * Apply a CreateTable change to the model.
+   */
+  protected void applyChange(CreateTable createTable) {
+    String tableName = createTable.getName();
+    if (tables.containsKey(tableName)) {
+      throw new IllegalStateException("Table [" + tableName + "] already exists?");
+    }
+    MTable table = new MTable(createTable);
+    tables.put(tableName, table);
+  }
+
+  /**
+   * Apply a AddColumn change to the model.
+   */
+  protected void applyChange(AddColumn addColumn) {
+    MTable table = tables.get(addColumn.getTableName());
+    if (table == null) {
+      throw new IllegalStateException("Table [" + addColumn.getTableName() + "] does not exist?");
+    }
+    table.apply(addColumn);
+  }
+
+  /**
+   * Apply a DropColumn change to the model.
+   */
+  protected void applyChange(DropColumn dropColumn) {
+    MTable table = tables.get(dropColumn.getTableName());
+    if (table == null) {
+      throw new IllegalStateException("Table [" + dropColumn.getTableName() + "] does not exist?");
+    }
+    table.apply(dropColumn);
+  }
+
+  /**
+   * Add a table (typically from reading EbeanServer meta data).
+   */
+  public void addTable(MTable table) {
+    tables.put(table.getName(), table);
+  }
+}

src/main/java/com/avaje/ebean/dbmigration/model/ModelDiff.java

@@ -0,0 +1,98 @@
+package com.avaje.ebean.dbmigration.model;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Used to prepare a diff in terms of changes required to migrate from
+ * the base model to the newer model.
+ */
+public class ModelDiff {
+
+  /**
+   * The base model to which we compare the newer model.
+   */
+  protected final ModelContainer baseModel;
+
+  /**
+   * List of 'create' type changes.
+   */
+  protected final List<Object> createChanges = new ArrayList<Object>();
+
+  /**
+   * List of 'drop' type changes. Potential for putting into a separate changeSet.
+   */
+  protected final List<Object> dropChanges = new ArrayList<Object>();
+
+  /**
+   * Construct with a base model.
+   */
+  public ModelDiff(ModelContainer baseModel) {
+    this.baseModel = baseModel;
+  }
+
+  /**
+   * Construct with a base model.
+   */
+  public ModelDiff() {
+    this.baseModel = new ModelContainer();
+  }
+
+  /**
+   * Return the list of 'create' changes.
+   */
+  public List<Object> getCreateChanges() {
+    return createChanges;
+  }
+
+  /**
+   * Return the list of 'drop' changes.
+   */
+  public List<Object> getDropChanges() {
+    return dropChanges;
+  }
+
+  /**
+   * Compare to a 'newer' model and collect the differences.
+   */
+  public void compareTo(ModelContainer newModel) {
+
+    for (MTable newTable : newModel.getTables().values()) {
+
+      MTable currentTable = baseModel.getTable(newTable.getName());
+      if (currentTable == null) {
+        addNewTable(newTable);
+      } else {
+        compareTables(currentTable, newTable);
+      }
+    }
+
+    //TODO: other parts of the model? views, indexes etc
+
+  }
+
+  /**
+   * Add CreateTable to the 'creation' changes.
+   */
+  protected void addNewTable(MTable newTable) {
+
+    createChanges.add(newTable.createTable());
+//    createChanges.add(newTable.createForeignKeys());
+  }
+
+  /**
+   * Compare tables looking for add/drop/modify columns etc.
+   */
+  protected void compareTables(MTable currentTable, MTable newTable) {
+
+    //TODO: compareTables()
+    // changed columns
+    // find additional columns
+    // find removed columns
+    // changes to indexes?
+    // changes to primary key
+    // changes to foreign key
+    // changes to unique constraints?
+
+  }
+}

src/main/java/com/avaje/ebean/dbmigration/model/build/ModelBuildBeanVisitor.java

@@ -0,0 +1,61 @@
+package com.avaje.ebean.dbmigration.model.build;
+
+import com.avaje.ebean.config.dbplatform.DbType;
+import com.avaje.ebeaninternal.server.deploy.BeanDescriptor;
+import com.avaje.ebeaninternal.server.deploy.CompoundUniqueContraint;
+import com.avaje.ebeaninternal.server.deploy.InheritInfo;
+import com.avaje.ebean.dbmigration.model.MColumn;
+import com.avaje.ebean.dbmigration.model.MTable;
+import com.avaje.ebean.dbmigration.model.visitor.BeanPropertyVisitor;
+import com.avaje.ebean.dbmigration.model.visitor.BeanVisitor;
+
+/**
+ * Used to build the Model objects MTable etc.
+ */
+public class ModelBuildBeanVisitor implements BeanVisitor {
+
+	private final ModelBuildContext ctx;
+
+	public ModelBuildBeanVisitor(ModelBuildContext ctx) {
+		this.ctx = ctx;
+	}
+
+  /**
+   * Return the PropertyVisitor used to read all the property meta data
+   * and in this case add MColumn objects to the model.
+   * <p>
+   *   This creates an MTable and adds it to the model.
+   * </p>
+   */
+  public BeanPropertyVisitor visitBean(BeanDescriptor<?> descriptor) {
+
+    if (!descriptor.isInheritanceRoot()) {
+      return null;
+    }
+
+    MTable table = new MTable(descriptor.getBaseTable());
+
+    // add the table to the model
+    ctx.addTable(table);
+
+    InheritInfo inheritInfo = descriptor.getInheritInfo();
+    if (inheritInfo != null && inheritInfo.isRoot()) {
+      // add the discriminator column
+      String discColumn = inheritInfo.getDiscriminatorColumn();
+      DbType dbType = ctx.getDbTypeMap().get(inheritInfo.getDiscriminatorType());
+      String discDbType = dbType.renderType(inheritInfo.getDiscriminatorLength(), 0);
+
+      table.addColumn(new MColumn(discColumn, discDbType, true));
+    }
+
+    CompoundUniqueContraint[] compoundUniqueConstraints = descriptor.getCompoundUniqueConstraints();
+    if (compoundUniqueConstraints != null) {
+      for (int i = 0; i < compoundUniqueConstraints.length; i++) {
+        table.addCompoundUniqueConstraint(compoundUniqueConstraints[i].getColumns());
+      }
+    }
+
+    return new ModelBuildPropertyVisitor(ctx, table);
+  }
+
+}

src/main/java/com/avaje/ebean/dbmigration/model/build/ModelBuildContext.java

@@ -0,0 +1,64 @@
+package com.avaje.ebean.dbmigration.model.build;
+
+import com.avaje.ebean.config.dbplatform.DbType;
+import com.avaje.ebean.config.dbplatform.DbTypeMap;
+import com.avaje.ebeaninternal.server.deploy.BeanProperty;
+import com.avaje.ebean.dbmigration.model.MTable;
+import com.avaje.ebean.dbmigration.model.ModelContainer;
+
+/**
+ * The context used during DDL generation.
+ */
+public class ModelBuildContext {
+
+  /**
+   * Use platform agnostic logical types. These types are converted to
+   * platform specific types in the DDL generation.
+   */
+  private final DbTypeMap dbTypeMap = DbTypeMap.logicalTypes();
+
+  private final ModelContainer model;
+
+  public ModelBuildContext(ModelContainer model) {
+    this.model = model;
+  }
+
+  public void addTable(MTable table) {
+    model.addTable(table);
+  }
+
+  /**
+   * Return the map used to determine the DB specific type
+   * for a given bean property.
+   */
+  public DbTypeMap getDbTypeMap() {
+    return dbTypeMap;
+  }
+
+
+  public String getColumnDefn(BeanProperty p) {
+    DbType dbType = getDbType(p);
+    if (dbType == null) {
+      throw new IllegalStateException("Unknown DbType mapping for " + p.getFullBeanName());
+    }
+    return p.renderDbType(dbType);
+  }
+
+  private DbType getDbType(BeanProperty p) {
+
+    if (p.isDbEncrypted()) {
+      return dbTypeMap.get(p.getDbEncryptedType());
+    }
+
+    int dbType = p.getDbType();
+    if (dbType == 0) {
+//      ScalarType<Object> scalarType = p.getScalarType();
+//      if (scalarType == null) {
+        throw new RuntimeException("No scalarType for " + p.getFullBeanName());
+//      }
+//      dbType = scalarType.getJdbcType();
+    }
+    return dbTypeMap.get(dbType);
+  }
+
+}

src/main/java/com/avaje/ebean/dbmigration/model/build/ModelBuildIntersectionTable.java

@@ -0,0 +1,124 @@
+package com.avaje.ebean.dbmigration.model.build;
+
+import com.avaje.ebeaninternal.server.deploy.BeanDescriptor;
+import com.avaje.ebeaninternal.server.deploy.BeanProperty;
+import com.avaje.ebeaninternal.server.deploy.BeanPropertyAssocMany;
+import com.avaje.ebeaninternal.server.deploy.TableJoin;
+import com.avaje.ebeaninternal.server.deploy.TableJoinColumn;
+import com.avaje.ebean.dbmigration.model.MColumn;
+import com.avaje.ebean.dbmigration.model.MTable;
+
+
+/**
+ * Add the intersection table to the model.
+ */
+public class ModelBuildIntersectionTable {
+
+	private final ModelBuildContext ctx;
+
+	private final BeanPropertyAssocMany<?> manyProp;
+	private final TableJoin intersectionTableJoin;
+	private final TableJoin tableJoin;
+
+	public ModelBuildIntersectionTable(ModelBuildContext ctx, BeanPropertyAssocMany<?> manyProp) {
+		this.ctx = ctx;
+		this.manyProp = manyProp;
+		this.intersectionTableJoin = manyProp.getIntersectionTableJoin();
+		this.tableJoin = manyProp.getTableJoin();
+	}
+
+	public void build() {
+
+    MTable table = createTable();
+    ctx.addTable(table);
+
+    //buildFkConstraints();
+	}
+
+//	private void buildFkConstraints(MTable table) {
+//
+//		BeanDescriptor<?> localDesc = manyProp.getBeanDescriptor();
+//		String fk1 = buildFkConstraints(localDesc, intersectionTableJoin.columns(), true);
+//		ctx.addIntersectionTableFk(fk1);
+//
+//		BeanDescriptor<?> targetDesc = manyProp.getTargetDescriptor();
+//		String fk2 = buildFkConstraints(targetDesc, tableJoin.columns(), false);
+//		ctx.addIntersectionTableFk(fk2);
+//	}
+
+	
+//	private String buildFkConstraints(BeanDescriptor<?> desc, TableJoinColumn[] columns, boolean direction) {
+//
+//
+//		String fkName = "fk_"+intersectionTableJoin.getTable()+"_"+desc.getBaseTable();
+//
+//		fkName = getFkNameWithSuffix(fkName);
+//
+//		fkBuf.append("alter table ");
+//		fkBuf.append(intersectionTableJoin.getTable());
+//		fkBuf.append(" add constraint ").append(fkName);
+//
+//		fkBuf.append(" foreign key (");
+//
+//		for (int i = 0; i < columns.length; i++) {
+//			if (i > 0) {
+//				fkBuf.append(", ");
+//			}
+//			String col = direction ? columns[i].getForeignDbColumn() : columns[i].getLocalDbColumn();
+//			fkBuf.append(col);
+//		}
+//		fkBuf.append(") references ").append(desc.getBaseTable()).append(" (");
+//
+//		for (int i = 0; i < columns.length; i++) {
+//			if (i > 0) {
+//				fkBuf.append(", ");
+//			}
+//			String col = !direction ? columns[i].getForeignDbColumn() : columns[i].getLocalDbColumn();
+//			fkBuf.append(col);
+//		}
+//		fkBuf.append(")");
+//
+//		String fkeySuffix = ctx.getDdlSyntax().getForeignKeySuffix();
+//		if (fkeySuffix != null){
+//			fkBuf.append(" ");
+//			fkBuf.append(fkeySuffix);
+//		}
+//		fkBuf.append(";").append(NEW_LINE);
+//
+//		return fkBuf.toString();
+//	}
+
+	private MTable createTable() {
+
+		BeanDescriptor<?> localDesc = manyProp.getBeanDescriptor();
+		BeanDescriptor<?> targetDesc = manyProp.getTargetDescriptor();
+
+    MTable table = new MTable(intersectionTableJoin.getTable());
+
+		TableJoinColumn[] columns = intersectionTableJoin.columns();
+		for (int i = 0; i < columns.length; i++) {
+			addColumn(table, localDesc, columns[i].getForeignDbColumn(), columns[i].getLocalDbColumn());
+		}
+
+		TableJoinColumn[] otherColumns = tableJoin.columns();
+		for (int i = 0; i < otherColumns.length; i++) {
+			addColumn(table, targetDesc, otherColumns[i].getLocalDbColumn(), otherColumns[i].getForeignDbColumn());
+		}
+
+    return table;
+	}
+
+	private void addColumn(MTable table, BeanDescriptor<?> desc, String column, String findPropColumn) {
+
+		BeanProperty p = desc.getIdBinder().findBeanProperty(findPropColumn);
+		if (p == null) {
+			throw new RuntimeException("Could not find id property for " + findPropColumn);
+		}
+
+    MColumn col = new MColumn(column, ctx.getColumnDefn(p), true);
+    col.setPrimaryKey(true);
+
+    table.addColumn(col);
+	}
+
+}

src/main/java/com/avaje/ebean/dbmigration/model/build/ModelBuildPropertyVisitor.java

@@ -0,0 +1,147 @@
+package com.avaje.ebean.dbmigration.model.build;
+
+import com.avaje.ebean.dbmigration.model.MCompoundForeignKey;
+import com.avaje.ebeaninternal.server.deploy.BeanProperty;
+import com.avaje.ebeaninternal.server.deploy.BeanPropertyAssocMany;
+import com.avaje.ebeaninternal.server.deploy.BeanPropertyAssocOne;
+import com.avaje.ebeaninternal.server.deploy.BeanPropertyCompound;
+import com.avaje.ebeaninternal.server.deploy.TableJoinColumn;
+import com.avaje.ebeaninternal.server.deploy.id.ImportedId;
+import com.avaje.ebean.dbmigration.model.MColumn;
+import com.avaje.ebean.dbmigration.model.MTable;
+import com.avaje.ebean.dbmigration.model.visitor.BaseTablePropertyVisitor;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Used as part of ModelBuildBeanVisitor and generally adds the MColumn to the associated
+ * MTable model objects.
+ */
+public class ModelBuildPropertyVisitor extends BaseTablePropertyVisitor {
+
+  private final ModelBuildContext ctx;
+
+  private final MTable table;
+
+  public ModelBuildPropertyVisitor(ModelBuildContext ctx, MTable table) {
+    this.ctx = ctx;
+    this.table = table;
+  }
+
+  @Override
+  public void visitMany(BeanPropertyAssocMany<?> p) {
+    if (p.isManyToMany()) {
+      if (p.getMappedBy() == null) {
+        // only create on other 'owning' side
+
+        //TableJoin intersectionTableJoin = p.getIntersectionTableJoin();
+        // check if the intersection table has already been created
+
+        // build the create table and fkey constraints
+        // putting the DDL into ctx for later output as we are
+        // in the middle of rendering the create table DDL
+        new ModelBuildIntersectionTable(ctx, p).build();
+      }
+    }
+  }
+
+  @Override
+  public void visitCompoundScalar(BeanPropertyCompound compound, BeanProperty p) {
+    visitScalar(p);
+  }
+
+  @Override
+  public void visitCompound(BeanPropertyCompound p) {
+    // do nothing
+  }
+
+  @Override
+  public void visitEmbeddedScalar(BeanProperty p, BeanPropertyAssocOne<?> embedded) {
+
+    //this.embedded = embedded;
+    visitScalar(p);
+  }
+
+  @Override
+  public void visitOneImported(BeanPropertyAssocOne<?> p) {
+
+    TableJoinColumn[] columns = p.getTableJoin().columns();
+    if (columns.length == 0) {
+      String msg = "No join columns for " + p.getFullBeanName();
+      throw new RuntimeException(msg);
+    }
+
+    ImportedId importedId = p.getImportedId();
+
+    List<MColumn> modelColumns = new ArrayList<MColumn>(columns.length);
+
+    MCompoundForeignKey compoundKey = null;
+    if (columns.length > 1) {
+      // compound foreign key
+      String refTable = p.getTargetDescriptor().getBaseTable();
+      compoundKey = new MCompoundForeignKey(refTable);
+      table.addForeignKey(compoundKey);
+    }
+
+    for (int i = 0; i < columns.length; i++) {
+
+      String dbCol = columns[i].getLocalDbColumn();
+      BeanProperty importedProperty = importedId.findMatchImport(dbCol);
+      if (importedProperty == null) {
+        throw new RuntimeException("Imported BeanProperty not found?");
+      }
+      String columnDefn = ctx.getColumnDefn(importedProperty);
+      String refColumn = importedProperty.getDbColumn();
+
+      MColumn col = new MColumn(dbCol, columnDefn, !p.isNullable());
+      if (columns.length == 1) {
+        // single references column (put it on the column)
+        String refTable = importedProperty.getBeanDescriptor().getBaseTable();
+        col.setReferences(refTable + "." + refColumn);
+      } else {
+        compoundKey.addColumnPair(dbCol, refColumn);
+      }
+      modelColumns.add(col);
+      table.addColumn(col);
+    }
+
+
+
+    if (p.isOneToOne()) {
+      // Adding the unique constraint restricts the cardinality from OneToMany down to OneToOne
+      if (modelColumns.size() == 1) {
+        modelColumns.get(0).setUnique(true);
+      } else {
+        table.addCompoundUniqueConstraint(modelColumns);
+      }
+    }
+  }
+
+	@Override
+	public void visitScalar(BeanProperty p) {
+
+    if (p.isSecondaryTable()) {
+      return;
+    }
+
+    MColumn col = new MColumn(p.getDbColumn(), ctx.getColumnDefn(p));
+
+		if (p.isId()){
+      col.setPrimaryKey(true);
+      if (p.getBeanDescriptor().isUseIdGenerator()) {
+        col.setIdentity(true);
+      }
+		} else if (!p.isNullable() || p.isDDLNotNull()) {
+      col.setNotnull(true);
+		}
+
+    if (p.isUnique() && !p.isId()) {
+      col.setUnique(true);
+    }
+    col.setCheckConstraint(p.getDbConstraintExpression());
+
+    table.addColumn(col);
+	}
+
+}

src/main/java/com/avaje/ebean/dbmigration/model/visitor/BaseTablePropertyVisitor.java

@@ -0,0 +1,59 @@
+package com.avaje.ebean.dbmigration.model.visitor;
+
+import com.avaje.ebeaninternal.server.deploy.BeanProperty;
+import com.avaje.ebeaninternal.server.deploy.BeanPropertyAssocMany;
+import com.avaje.ebeaninternal.server.deploy.BeanPropertyAssocOne;
+import com.avaje.ebeaninternal.server.deploy.BeanPropertyCompound;
+
+/**
+ * Used to help mark PropertyVisitor methods that need to be implemented
+ * to visit base table properties.
+ */
+public abstract class BaseTablePropertyVisitor implements BeanPropertyVisitor {
+
+  /**
+   * Not required in that you can use the visitEmbeddedScalar.
+   */
+  public void visitEmbedded(BeanPropertyAssocOne<?> p) {
+  }
+
+  /**
+   * Override this method.
+   */
+  public abstract void visitEmbeddedScalar(BeanProperty p, BeanPropertyAssocOne<?> embedded);
+
+  /**
+   * Not part of base table.
+   */
+  public void visitMany(BeanPropertyAssocMany<?> p) {
+  }
+
+  /**
+   * Not part of base table.
+   */
+  public void visitOneExported(BeanPropertyAssocOne<?> p) {
+  }
+
+  /**
+   * Override this method for the foreign key.
+   */
+  public abstract void visitOneImported(BeanPropertyAssocOne<?> p);
+
+  /**
+   * Override this method for normal scalar property.
+   */
+  public abstract void visitScalar(BeanProperty p);
+
+  /**
+   * Not required in that the scalar properties map to the columns.
+   */
+  public void visitCompound(BeanPropertyCompound p) {
+  }
+
+  /**
+   * Override this method for scalar property inside a Immutable Compound Value object.
+   */
+  public abstract void visitCompoundScalar(BeanPropertyCompound compound, BeanProperty p);
+
+
+}

src/main/java/com/avaje/ebean/dbmigration/model/visitor/BeanPropertyVisitor.java

@@ -0,0 +1,53 @@
+package com.avaje.ebean.dbmigration.model.visitor;
+
+import com.avaje.ebeaninternal.server.deploy.BeanProperty;
+import com.avaje.ebeaninternal.server.deploy.BeanPropertyAssocMany;
+import com.avaje.ebeaninternal.server.deploy.BeanPropertyAssocOne;
+import com.avaje.ebeaninternal.server.deploy.BeanPropertyCompound;
+
+/**
+ * Used to visit a BeanProperty given the type of bean property it is.
+ */
+public interface BeanPropertyVisitor {
+
+  /**
+   * Visit a OneToMany or ManyToMany property.
+   */
+  void visitMany(BeanPropertyAssocMany<?> p);
+
+  /**
+   * Visit the imported side of a OneToOne property.
+   */
+  void visitOneImported(BeanPropertyAssocOne<?> p);
+
+  /**
+   * Visit the exported side of a OneToOne property.
+   */
+  void visitOneExported(BeanPropertyAssocOne<?> p);
+
+  /**
+   * Visit an embedded property.
+   */
+  void visitEmbedded(BeanPropertyAssocOne<?> p);
+
+  /**
+   * Visit the scalar property of an embedded bean.
+   */
+  void visitEmbeddedScalar(BeanProperty p, BeanPropertyAssocOne<?> embedded);
+
+  /**
+   * Visit a scalar property.
+   */
+  void visitScalar(BeanProperty p);
+
+  /**
+   * Visit a compound value object.
+   */
+  void visitCompound(BeanPropertyCompound p);
+
+  /**
+   * Visit the scalar value inside a compound value object.
+   */
+  void visitCompoundScalar(BeanPropertyCompound compound, BeanProperty p);
+
+}

src/main/java/com/avaje/ebean/dbmigration/model/visitor/BeanVisitor.java

@@ -0,0 +1,16 @@
+package com.avaje.ebean.dbmigration.model.visitor;
+
+import com.avaje.ebeaninternal.server.deploy.BeanDescriptor;
+
+/**
+ * Visitor pattern for visiting a BeanDescriptor and potentially all its bean
+ * properties.
+ */
+public interface BeanVisitor {
+
+	/**
+	 * Visit a BeanDescriptor and return a PropertyVisitor to use to visit each
+   * property on the entity bean (return null to skip visiting this bean).
+	 */
+  BeanPropertyVisitor visitBean(BeanDescriptor<?> descriptor);
+}

src/main/java/com/avaje/ebean/dbmigration/model/visitor/VisitAllUsing.java

@@ -0,0 +1,158 @@
+package com.avaje.ebean.dbmigration.model.visitor;
+
+import com.avaje.ebeaninternal.api.SpiEbeanServer;
+import com.avaje.ebeaninternal.server.deploy.BeanDescriptor;
+import com.avaje.ebeaninternal.server.deploy.BeanProperty;
+import com.avaje.ebeaninternal.server.deploy.BeanPropertyAssocMany;
+import com.avaje.ebeaninternal.server.deploy.BeanPropertyAssocOne;
+import com.avaje.ebeaninternal.server.deploy.BeanPropertyCompound;
+import com.avaje.ebeaninternal.server.deploy.InheritInfo;
+import com.avaje.ebeaninternal.server.deploy.InheritInfoVisitor;
+
+import java.util.List;
+
+/**
+ * Makes use of BeanVisitor and PropertyVisitor to navigate BeanDescriptors
+ * and their properties.
+ */
+public class VisitAllUsing {
+
+  protected final BeanVisitor visitor;
+
+  protected final List<BeanDescriptor<?>> descriptors;
+
+  /**
+   * Visit all the descriptors for a given server.
+   */
+  public VisitAllUsing(BeanVisitor visitor, SpiEbeanServer server) {
+
+    this(visitor, server.getBeanDescriptors());
+  }
+
+  /**
+   * Visit all the descriptors in the list.
+   */
+  public VisitAllUsing(BeanVisitor visitor, List<BeanDescriptor<?>> descriptors) {
+    this.visitor = visitor;
+    this.descriptors = descriptors;
+  }
+
+  public void visitAllBeans() {
+    for (BeanDescriptor<?> desc : descriptors) {
+      if (desc.getBaseTable() != null) {
+        visitBean(desc, visitor);
+      }
+    }
+  }
+
+  /**
+   * Visit the bean using a visitor.
+   */
+  protected void visitBean(BeanDescriptor<?> desc, BeanVisitor visitor) {
+
+    BeanPropertyVisitor propertyVisitor = visitor.visitBean(desc);
+    if (propertyVisitor != null) {
+
+      BeanProperty idProp = desc.getIdProperty();
+      if (idProp != null) {
+        visit(propertyVisitor, idProp);
+      }
+
+      BeanPropertyAssocOne<?> unidirectional = desc.getUnidirectional();
+      if (unidirectional != null) {
+        visit(propertyVisitor, unidirectional);
+      }
+
+      BeanProperty[] propertiesNonTransient = desc.propertiesNonTransient();
+      for (int i = 0; i < propertiesNonTransient.length; i++) {
+        BeanProperty p = propertiesNonTransient[i];
+        if (!p.isFormula() && !p.isSecondaryTable()) {
+          visit(propertyVisitor, p);
+        }
+      }
+
+      visitInheritanceProperties(desc, propertyVisitor);
+    }
+  }
+
+  /**
+   * Visit the property.
+   */
+  protected void visit(BeanPropertyVisitor pv, BeanProperty p) {
+
+    if (p instanceof BeanPropertyAssocMany<?>) {
+      // oneToMany or manyToMany
+      pv.visitMany((BeanPropertyAssocMany<?>) p);
+
+    } else if (p instanceof BeanPropertyAssocOne<?>) {
+      BeanPropertyAssocOne<?> assocOne = (BeanPropertyAssocOne<?>) p;
+      if (assocOne.isEmbedded()) {
+        // Embedded bean
+        pv.visitEmbedded(assocOne);
+        BeanProperty[] embProps = assocOne.getProperties();
+        for (int i = 0; i < embProps.length; i++) {
+          pv.visitEmbeddedScalar(embProps[i], assocOne);
+        }
+
+      } else if (assocOne.isOneToOneExported()) {
+        // associated one exported
+        pv.visitOneExported(assocOne);
+
+      } else {
+        // associated one imported
+        pv.visitOneImported(assocOne);
+      }
+
+    } else if (p instanceof BeanPropertyCompound) {
+      // compound type
+      BeanPropertyCompound compound = (BeanPropertyCompound) p;
+      pv.visitCompound(compound);
+
+      BeanProperty[] properties = compound.getScalarProperties();
+      for (int i = 0; i < properties.length; i++) {
+        pv.visitCompoundScalar(compound, properties[i]);
+      }
+
+    } else {
+      // simple scalar type
+      pv.visitScalar(p);
+    }
+  }
+
+
+  /**
+   * Visit all the other inheritance properties that are not on the root.
+   */
+  protected void visitInheritanceProperties(BeanDescriptor<?> descriptor, BeanPropertyVisitor pv) {
+
+    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);
+    }
+  }
+
+
+  /**
+   * Helper used to visit all the inheritInfo/BeanDescriptor in
+   * the inheritance hierarchy (to add their 'local' properties).
+   */
+  protected class InheritChildVisitor implements InheritInfoVisitor {
+
+    private final VisitAllUsing owner;
+    private final BeanPropertyVisitor pv;
+
+    protected InheritChildVisitor(VisitAllUsing owner, BeanPropertyVisitor pv) {
+      this.owner = owner;
+      this.pv = pv;
+    }
+
+    public void visit(InheritInfo inheritInfo) {
+      BeanProperty[] propertiesLocal = inheritInfo.getBeanDescriptor().propertiesLocal();
+      for (int i = 0; i <propertiesLocal.length ; i++) {
+        owner.visit(pv, propertiesLocal[i]);
+      }
+    }
+  }
+}

src/main/java/com/avaje/ebeaninternal/server/ddl/DdlGenerator.java

@@ -15,6 +15,7 @@ import java.util.List;
 
 import javax.persistence.PersistenceException;
 
+import com.avaje.ebean.dbmigration.model.CurrentModel;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -39,6 +40,7 @@ public class DdlGenerator implements SpiEbeanPlugin {
   private boolean generateDdl;
   private boolean runDdl;
 
+  private CurrentModel currentModel;
   private String dropContent;
   private String createContent;
 
@@ -70,6 +72,10 @@ public class DdlGenerator implements SpiEbeanPlugin {
     if (generateDdl) {
       writeDrop(getDropFileName());
       writeCreate(getCreateFileName());
+
+      String mn = server.getName() + "-migration.xml";
+      File migrationXml = new File(mn);
+      writeMigration(migrationXml);
     }
   }
 
@@ -122,44 +128,60 @@ public class DdlGenerator implements SpiEbeanPlugin {
 
   public String generateDropDdl() {
 
-    DdlGenContext ctx = createContext();
-
-    if (ctx.getDdlSyntax().isDropKeyConstraints()) {
-      // generate drop foreign key constraint statements (sql server joy)
-      AddForeignKeysVisitor fkeys = new AddForeignKeysVisitor(false, ctx);
-      VisitorUtil.visit(server, fkeys);
-      ctx.writeNewLine();
+    try {
+      dropContent = currentModel().getDropDdl();
+      return dropContent;
+    } catch (IOException e) {
+      throw new RuntimeException(e);
     }
+//    DdlGenContext ctx = createContext();
+//
+//    if (ctx.getDdlSyntax().isDropKeyConstraints()) {
+//      // generate drop foreign key constraint statements (sql server joy)
+//      AddForeignKeysVisitor fkeys = new AddForeignKeysVisitor(false, ctx);
+//      VisitorUtil.visit(server, fkeys);
+//      ctx.writeNewLine();
+//    }
+//
+//    DropTableVisitor drop = new DropTableVisitor(ctx);
+//    VisitorUtil.visit(server, drop);
+//
+//    DropSequenceVisitor dropSequence = new DropSequenceVisitor(ctx);
+//    VisitorUtil.visit(server, dropSequence);
+//
+//    ctx.flush();
+//    dropContent = ctx.getContent();
+//    return dropContent;
+  }
+  public void writeMigration(File file) {
 
-    DropTableVisitor drop = new DropTableVisitor(ctx);
-    VisitorUtil.visit(server, drop);
-
-    DropSequenceVisitor dropSequence = new DropSequenceVisitor(ctx);
-    VisitorUtil.visit(server, dropSequence);
-
-    ctx.flush();
-    dropContent = ctx.getContent();
-    return dropContent;
+    currentModel().writeMigration(file);
   }
 
   public String generateCreateDdl() {
 
-    DdlGenContext ctx = createContext();
-    CreateTableVisitor create = new CreateTableVisitor(ctx);
-    VisitorUtil.visit(server, create);
-
-    CreateSequenceVisitor createSequence = new CreateSequenceVisitor(ctx);
-    VisitorUtil.visit(server, createSequence);
-
-    AddForeignKeysVisitor fkeys = new AddForeignKeysVisitor(true, ctx);
-    VisitorUtil.visit(server, fkeys);
-
-    CreateIndexVisitor indexes = new CreateIndexVisitor(ctx);
-    VisitorUtil.visit(server, indexes);
-
-    ctx.flush();
-    createContent = ctx.getContent();
-    return createContent;
+    try {
+      createContent = currentModel().getCreateDdl();
+      return createContent;
+    } catch (IOException e) {
+      throw new RuntimeException(e);
+    }
+//    DdlGenContext ctx = createContext();
+//    CreateTableVisitor create = new CreateTableVisitor(ctx);
+//    VisitorUtil.visit(server, create);
+//
+//    CreateSequenceVisitor createSequence = new CreateSequenceVisitor(ctx);
+//    VisitorUtil.visit(server, createSequence);
+//
+//    AddForeignKeysVisitor fkeys = new AddForeignKeysVisitor(true, ctx);
+//    VisitorUtil.visit(server, fkeys);
+//
+//    CreateIndexVisitor indexes = new CreateIndexVisitor(ctx);
+//    VisitorUtil.visit(server, indexes);
+//
+//    ctx.flush();
+//    createContent = ctx.getContent();
+//    return createContent;
   }
 
   protected String getDropFileName() {
@@ -174,6 +196,15 @@ public class DdlGenerator implements SpiEbeanPlugin {
     return new DdlGenContext(dbPlatform, namingConvention);
   }
 
+
+
+  protected CurrentModel currentModel() {
+    if (currentModel == null) {
+      currentModel = new CurrentModel(server);
+    }
+    return currentModel;
+  }
+
   protected void writeFile(String fileName, String fileContent) throws IOException {
 
     File f = new File(fileName);
@@ -199,7 +230,7 @@ public class DdlGenerator implements SpiEbeanPlugin {
     FileReader fr = new FileReader(f);
     LineNumberReader lr = new LineNumberReader(fr);
     try {
-      String s = null;
+      String s;
       while ((s = lr.readLine()) != null) {
         buf.append(s).append("\n");
       }