return session.getBatcher().prepareStatement(insertSQL, keyColumns);

IdentifierGeneratorHelper.getGeneratedIdentity(insert.getGeneratedKeys(), getPersister().getIdentifierType());

import java.sql.PreparedStatement;
import java.sql.SQLException;

import org.hibernate.HibernateException;
import org.hibernate.dialect.Dialect;
import org.hibernate.engine.jdbc.batch.spi.BatchBuilder;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.id.AbstractPostInsertGenerator;

import org.hibernate.id.IdentifierGeneratorHelper;
import org.hibernate.id.PostInsertIdentityPersister;
import org.hibernate.id.SequenceIdentityGenerator.NoCommentsInsert;
import org.hibernate.id.insert.AbstractReturningDelegate;
import org.hibernate.id.insert.IdentifierGeneratingInsert;
import org.hibernate.id.insert.InsertGeneratedIdentifierDelegate;


/**
* A generator with immediate retrieval through JDBC3 {@link java.sql.Connection#prepareStatement(String, String[]) getGeneratedKeys}.
* The value of the identity column must be set from a "before insert trigger"
* <p/>
* This generator only known to work with newer Oracle drivers compiled for
* JDK 1.4 (JDBC3). The minimum version is 10.2.0.1
* <p/>
* Note: Due to a bug in Oracle drivers, sql comments on these insert statements
* are completely disabled.
*
* @author Jean-Pol Landrain
*/
public class TriggerAssignedIdentityGenerator extends AbstractPostInsertGenerator {

    public InsertGeneratedIdentifierDelegate getInsertGeneratedIdentifierDelegate(PostInsertIdentityPersister persister, Dialect dialect, boolean isGetGeneratedKeysEnabled) throws HibernateException {
        return new Delegate(persister, dialect);
    }

    public static class Delegate extends AbstractReturningDelegate {
        private final Dialect dialect;

        private final String[] keyColumns;

        public Delegate(PostInsertIdentityPersister persister, Dialect dialect) {
            super(persister);
            this.dialect = dialect;
            this.keyColumns = getPersister().getRootTableKeyColumnNames();
            if (keyColumns.length > 1) {
                throw new HibernateException("trigger assigned identity generator cannot be used with multi-column keys");
            }
        }

        public IdentifierGeneratingInsert prepareIdentifierGeneratingInsert() {
            NoCommentsInsert insert = new NoCommentsInsert(dialect);
            return insert;
        }

        protected PreparedStatement prepare(String insertSQL, SessionImplementor session) throws SQLException {
           BatchBuilder bb =
            return session.getBatcher().prepareStatement(insertSQL, keyColumns);
        }

        protected Serializable executeAndExtract(PreparedStatement insert) throws SQLException {
            insert.executeUpdate();
            return IdentifierGeneratorHelper.getGeneratedIdentity(insert.getGeneratedKeys(), getPersister().getIdentifierType());
        }
    }

/* ... */
import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.hibernate.HibernateException;
import org.hibernate.dialect.Dialect;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.id.AbstractPostInsertGenerator;
import org.hibernate.id.IdentifierGeneratorHelper;
import org.hibernate.id.PostInsertIdentityPersister;
import org.hibernate.id.SequenceIdentityGenerator.NoCommentsInsert;
import org.hibernate.id.insert.AbstractReturningDelegate;
import org.hibernate.id.insert.IdentifierGeneratingInsert;
import org.hibernate.id.insert.InsertGeneratedIdentifierDelegate;

/* ... */
public class TriggerAssignedIdentityGenerator extends AbstractPostInsertGenerator {

   /**
    * {@inheritDoc}
    */
   @Override
   public InsertGeneratedIdentifierDelegate getInsertGeneratedIdentifierDelegate(
      PostInsertIdentityPersister persister, Dialect dialect, boolean isGetGeneratedKeysEnabled)
      throws HibernateException {
      return new Delegate(persister, dialect);
   }

   public static class Delegate extends AbstractReturningDelegate {

      private Dialect dialect;
      private String[] keyColumns;

      public Delegate(PostInsertIdentityPersister persister, Dialect dialect) {
         super(persister);
         this.dialect = dialect;
         this.keyColumns = getPersister().getRootTableKeyColumnNames();
         if (keyColumns.length > 1) {
            throw new HibernateException(
               "trigger assigned identity generator cannot be used with multi-column keys");
         }
      }

      /**
       * {@inheritDoc}
       */
      @Override
      public IdentifierGeneratingInsert prepareIdentifierGeneratingInsert() {
         return new NoCommentsInsert(dialect);
      }

      /**
       * {@inheritDoc}
       */
      @Override
      protected PreparedStatement prepare(String insertSQL, SessionImplementor session) throws SQLException {
         return session.connection().prepareStatement(insertSQL, keyColumns);
      }

      /**
       * {@inheritDoc}
       */
      @Override
      protected Serializable executeAndExtract(PreparedStatement insert, SessionImplementor session)
         throws SQLException {
         insert.executeUpdate();
         ResultSet generatedKeys = insert.getGeneratedKeys();
         try {
            return IdentifierGeneratorHelper.getGeneratedIdentity(generatedKeys, keyColumns[0], getPersister()
               .getIdentifierType());
         } finally {
            generatedKeys.close();
         }
      }
   }
}