Hibernate example source code file (DiscrimSubclassOneToOneTest.java)

This example Hibernate source code file (DiscrimSubclassOneToOneTest.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

address, address, entity, entitystatistics, gavin, gavin, ifa, org, org, override, person, person, string, util, vic

The Hibernate DiscrimSubclassOneToOneTest.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2006-2011, 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.test.onetoone.singletable;
import java.util.List;

import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.cfg.Environment;
import org.hibernate.stat.EntityStatistics;

import org.junit.Test;

import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;

/**
 * @author Gavin King
 */
public class DiscrimSubclassOneToOneTest extends BaseCoreFunctionalTestCase {
	@Override
	public String[] getMappings() {
		return new String[] { "onetoone/singletable/Person.hbm.xml" };
	}

	@Override
	public void configure(Configuration cfg) {
		cfg.setProperty(Environment.USE_SECOND_LEVEL_CACHE, "false");
		cfg.setProperty(Environment.GENERATE_STATISTICS, "true");
	}

	@Test
	public void testOneToOneOnSubclass() {
		Person p = new Person();
		p.name = "Gavin";
		Address a = new Address();
		a.entityName = "Gavin";
		a.zip = "3181";
		a.state = "VIC";
		a.street = "Karbarook Ave";
		p.address = a;
		
		Session s = openSession();
		Transaction t = s.beginTransaction();
		s.persist(p);
		t.commit();
		s.close();
		
		s = openSession();
		t = s.beginTransaction();
		
		EntityStatistics addressStats = sessionFactory().getStatistics().getEntityStatistics( Address.class.getName() );
		EntityStatistics mailingAddressStats = sessionFactory().getStatistics().getEntityStatistics("MailingAddress");

		p = (Person) s.createQuery("from Person p join fetch p.address left join fetch p.mailingAddress").uniqueResult();
		assertNotNull(p.address); assertNull(p.mailingAddress);
		s.clear();

		assertEquals( addressStats.getFetchCount(), 0 );
		assertEquals( mailingAddressStats.getFetchCount(), 0 );
		
		p = (Person) s.createQuery("from Person p join fetch p.address").uniqueResult();
		assertNotNull(p.address); assertNull(p.mailingAddress);
		s.clear();
		
		assertEquals( addressStats.getFetchCount(), 0 );
		assertEquals( mailingAddressStats.getFetchCount(), 1 );

		p = (Person) s.createQuery("from Person").uniqueResult();
		assertNotNull(p.address); assertNull(p.mailingAddress);
		s.clear();
		
		assertEquals( addressStats.getFetchCount(), 1 );
		assertEquals( mailingAddressStats.getFetchCount(), 2 );

		p = (Person) s.createQuery("from Entity").uniqueResult();
		assertNotNull(p.address); assertNull(p.mailingAddress);
		s.clear();
		
		assertEquals( addressStats.getFetchCount(), 2 );
		assertEquals( mailingAddressStats.getFetchCount(), 3 );

		//note that in here join fetch is used for the nullable
		//one-to-one, due to a very special case of default
		p = (Person) s.get(Person.class, "Gavin");
		assertNotNull(p.address); assertNull(p.mailingAddress);
		s.clear();
		
		assertEquals( addressStats.getFetchCount(), 2 );
		assertEquals( mailingAddressStats.getFetchCount(), 3 );

		p = (Person) s.get(Entity.class, "Gavin");
		assertNotNull(p.address); assertNull(p.mailingAddress);
		s.clear();
		
		assertEquals( addressStats.getFetchCount(), 2 );
		assertEquals( mailingAddressStats.getFetchCount(), 3 );
		
		t.commit();
		s.close();
		
		s = openSession();
		t = s.beginTransaction();
		Org org = new Org();
		org.name = "IFA";
		Address a2 = new Address();
		a2.entityName = "IFA";
		a2.zip = "3181";
		a2.state = "VIC";
		a2.street = "Orrong Rd";
		org.addresses.add(a2);
		s.persist(org);
		t.commit();
		s.close();
		
		s = openSession();
		t = s.beginTransaction();
		org = (Org) s.get(Entity.class, "IFA");
		s.clear();
		
		List list = s.createQuery("from Entity e order by e.name").list();
		p = (Person) list.get(0);
		assertNotNull(p.address); assertNull(p.mailingAddress);
		org = (Org) list.get(1);
		assertEquals( org.addresses.size(), 1 );
		s.clear();
		
		list = s.createQuery("from Entity e left join fetch e.address left join fetch e.mailingAddress order by e.name").list();
		p = (Person) list.get(0);
		org = (Org) list.get(1);
		assertNotNull(p.address); assertNull(p.mailingAddress);
		assertEquals( org.addresses.size(), 1 );
		
		s.delete(p);
		s.delete(org);
		
		t.commit();
		s.close();
		
	}

}