Hibernate example source code file (PersistTest.java)

This example Hibernate source code file (PersistTest.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

arraylist, collection, employee, entitymanager, entitymanager, entitymanagerfactoryimpl, node, node, numberednode, numberednode, override, persistenceexception, test, test, util

The Hibernate PersistTest.java source code

// $Id$
/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2010, Red Hat Inc. 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 Inc.
 *
 * 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.ejb.test.ops;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceException;
import javax.persistence.RollbackException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Map;

import org.hibernate.cfg.Environment;
import org.hibernate.ejb.EntityManagerFactoryImpl;
import org.hibernate.ejb.test.BaseEntityManagerFunctionalTestCase;

import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.fail;

/**
 * @author Gavin King
 * @author Hardy Ferentschik
 */
public class PersistTest extends BaseEntityManagerFunctionalTestCase {
	@Test
	public void testCreateTree() {

		clearCounts();
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		Node root = new Node( "root" );
		Node child = new Node( "child" );
		root.addChild( child );
		em.persist( root );
		em.getTransaction().commit();
		em.close();

		assertInsertCount( 2 );
		assertUpdateCount( 0 );

		em = getOrCreateEntityManager();
		em.getTransaction().begin();
		root = em.find( Node.class, "root" );
		Node child2 = new Node( "child2" );
		root.addChild( child2 );
		em.getTransaction().commit();
		em.close();

		assertInsertCount( 3 );
		assertUpdateCount( 0 );
	}

	@Test
	public void testCreateTreeWithGeneratedId() {
		clearCounts();

		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		NumberedNode root = new NumberedNode( "root" );
		NumberedNode child = new NumberedNode( "child" );
		root.addChild( child );
		em.persist( root );
		em.getTransaction().commit();
		em.close();

		assertInsertCount( 2 );
		assertUpdateCount( 0 );

		em = getOrCreateEntityManager();
		em.getTransaction().begin();
		root = em.find( NumberedNode.class, root.getId() );
		NumberedNode child2 = new NumberedNode( "child2" );
		root.addChild( child2 );
		em.getTransaction().commit();
		em.close();

		assertInsertCount( 3 );
		assertUpdateCount( 0 );
	}

	@Test
	public void testCreateException() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		Node dupe = new Node( "dupe" );
		em.persist( dupe );
		em.persist( dupe );
		em.getTransaction().commit();
		em.close();

		em = getOrCreateEntityManager();
		em.getTransaction().begin();
		em.persist( dupe );
		try {
			em.getTransaction().commit();
			fail( "Cannot persist() twice the same entity" );
		}
		catch ( Exception cve ) {
			//verify that an exception is thrown!
		}
		em.close();

		Node nondupe = new Node( "nondupe" );
		nondupe.addChild( dupe );

		em = getOrCreateEntityManager();
		em.getTransaction().begin();
		em.persist( nondupe );
		try {
			em.getTransaction().commit();
			assertFalse( true );
		}
		catch ( RollbackException e ) {
			//verify that an exception is thrown!
		}
		em.close();
	}

	@Test
	public void testCreateExceptionWithGeneratedId() {
		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		NumberedNode dupe = new NumberedNode( "dupe" );
		em.persist( dupe );
		em.persist( dupe );
		em.getTransaction().commit();
		em.close();

		em = getOrCreateEntityManager();
		em.getTransaction().begin();
		try {
			em.persist( dupe );
			fail();
		}
		catch ( PersistenceException poe ) {
			//verify that an exception is thrown!
		}
		em.getTransaction().rollback();
		em.close();

		NumberedNode nondupe = new NumberedNode( "nondupe" );
		nondupe.addChild( dupe );

		em = getOrCreateEntityManager();
		em.getTransaction().begin();
		try {
			em.persist( nondupe );
			fail();
		}
		catch ( PersistenceException poe ) {
			//verify that an exception is thrown!
		}
		em.getTransaction().rollback();
		em.close();
	}

	@Test
	public void testBasic() throws Exception {

		EntityManager em = getOrCreateEntityManager();
		em.getTransaction().begin();
		Employer er = new Employer();
		Employee ee = new Employee();
		em.persist( ee );
		Collection<Employee> erColl = new ArrayList();
		Collection<Employer> eeColl = new ArrayList();
		erColl.add( ee );
		eeColl.add( er );
		er.setEmployees( erColl );
		ee.setEmployers( eeColl );
		em.getTransaction().commit();
		em.close();

		em = getOrCreateEntityManager();
		em.getTransaction().begin();
		er = em.find( Employer.class, er.getId() );
		assertNotNull( er );
		assertNotNull( er.getEmployees() );
		assertEquals( 1, er.getEmployees().size() );
		Employee eeFromDb = ( Employee ) er.getEmployees().iterator().next();
		assertEquals( ee.getId(), eeFromDb.getId() );
		em.getTransaction().commit();
		em.close();
	}

	private void clearCounts() {
		( ( EntityManagerFactoryImpl ) entityManagerFactory() ).getSessionFactory().getStatistics().clear();
	}

	private void assertInsertCount(int count) {
		int inserts = ( int ) ( ( EntityManagerFactoryImpl ) entityManagerFactory() ).getSessionFactory()
				.getStatistics()
				.getEntityInsertCount();
		assertEquals( count, inserts );
	}

	private void assertUpdateCount(int count) {
		int updates = ( int ) ( ( EntityManagerFactoryImpl ) entityManagerFactory() ).getSessionFactory()
				.getStatistics()
				.getEntityUpdateCount();
		assertEquals( count, updates );
	}

	@Override
	@SuppressWarnings( {"unchecked"})
	protected void addConfigOptions(Map options) {
		options.put( Environment.GENERATE_STATISTICS, "true" );
		options.put( Environment.STATEMENT_BATCH_SIZE, "0" );
	}

	@Override
	protected Class<?>[] getAnnotatedClasses() {
		return new Class<?>[] { Node.class };
	}

	@Override
	protected String[] getMappings() {
		return new String[] {
				"org/hibernate/ejb/test/ops/Node.hbm.xml",
				"org/hibernate/ejb/test/ops/Employer.hbm.xml"
		};
	}
}