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Hibernate example source code file (SequenceIdentityGenerator.java)

This example Hibernate source code file (SequenceIdentityGenerator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Hibernate tags/keywords

delegate, dialect, dialect, hibernateexception, identifiergeneratinginsert, io, jdbc, mappingexception, nocommentsinsert, nocommentsinsert, override, override, serializable, sql, sqlexception, string, string, util

The Hibernate SequenceIdentityGenerator.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
 * indicated by the @author tags or express copyright attribution
 * statements applied by the authors.  All third-party contributions are
 * distributed under license by Red Hat Middleware LLC.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 *
 */
package org.hibernate.id;

import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Properties;
import org.hibernate.HibernateException;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.internal.CoreMessageLogger;
import org.hibernate.MappingException;
import org.hibernate.dialect.Dialect;
import org.hibernate.id.insert.AbstractReturningDelegate;
import org.hibernate.id.insert.IdentifierGeneratingInsert;
import org.hibernate.id.insert.InsertGeneratedIdentifierDelegate;
import org.hibernate.sql.Insert;
import org.hibernate.type.Type;
import org.jboss.logging.Logger;

/**
 * A generator which combines sequence generation with immediate retrieval
 * through JDBC3 {@link java.sql.Connection#prepareStatement(String, String[]) getGeneratedKeys}.
 * In this respect it works much like ANSI-SQL IDENTITY generation.
 * <p/>
 * This generator only known to work with newer Oracle drivers compiled for
 * JDK 1.4 (JDBC3).
 * <p/>
 * Note: Due to a bug in Oracle drivers, sql comments on these insert statements
 * are completely disabled.
 *
 * @author Steve Ebersole
 */
public class SequenceIdentityGenerator extends SequenceGenerator
		implements PostInsertIdentifierGenerator {

    private static final CoreMessageLogger LOG = Logger.getMessageLogger(CoreMessageLogger.class,
                                                                       SequenceIdentityGenerator.class.getName());

	@Override
    public Serializable generate(SessionImplementor s, Object obj) {
		return IdentifierGeneratorHelper.POST_INSERT_INDICATOR;
	}

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

	@Override
    public void configure(Type type, Properties params, Dialect dialect) throws MappingException {
		super.configure( type, params, dialect );
	}

	public static class Delegate extends AbstractReturningDelegate {
		private final Dialect dialect;
		private final String sequenceNextValFragment;
		private final String[] keyColumns;

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

		public IdentifierGeneratingInsert prepareIdentifierGeneratingInsert() {
			NoCommentsInsert insert = new NoCommentsInsert( dialect );
			insert.addColumn( getPersister().getRootTableKeyColumnNames()[0], sequenceNextValFragment );
			return insert;
		}

		@Override
        protected PreparedStatement prepare(String insertSQL, SessionImplementor session) throws SQLException {
			return session.getTransactionCoordinator().getJdbcCoordinator().getStatementPreparer().prepareStatement( insertSQL, keyColumns );
		}

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

	public static class NoCommentsInsert extends IdentifierGeneratingInsert {
		public NoCommentsInsert(Dialect dialect) {
			super( dialect );
		}

		@Override
        public Insert setComment(String comment) {
			// don't allow comments on these insert statements as comments totally
			// blow up the Oracle getGeneratedKeys "support" :(
            LOG.disallowingInsertStatementComment();
			return this;
		}
	}
}

Other Hibernate examples (source code examples)

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