Hibernate example source code file (SubselectFetchTest.java)

This example Hibernate source code file (SubselectFetchTest.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

basecorefunctionaltestcase, child, child, list, override, parent, parent, session, session, string, subselectfetchtest, test, test, transaction, util

The Hibernate SubselectFetchTest.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.subselectfetch;

import java.util.List;

import org.hibernate.FetchMode;
import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.cfg.Environment;
import org.hibernate.criterion.Order;
import org.hibernate.criterion.Property;

import org.junit.Test;

import org.hibernate.testing.junit4.BaseCoreFunctionalTestCase;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

/**
 * @author Gavin King
 */
public class SubselectFetchTest extends BaseCoreFunctionalTestCase {
	@Override
	public String[] getMappings() {
		return new String[] { "subselectfetch/ParentChild.hbm.xml" };
	}

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

	@Override
	public String getCacheConcurrencyStrategy() {
		return null;
	}

	@Test
	public void testSubselectFetchHql() {
		Session s = openSession();
		Transaction t = s.beginTransaction();
		Parent p = new Parent("foo");
		p.getChildren().add( new Child("foo1") );
		p.getChildren().add( new Child("foo2") );
		Parent q = new Parent("bar");
		q.getChildren().add( new Child("bar1") );
		q.getChildren().add( new Child("bar2") );
		q.getMoreChildren().addAll( p.getChildren() );
		s.persist(p); 
		s.persist(q);
		t.commit();
		s.close();
		
		s = openSession();
		t = s.beginTransaction();
		
		sessionFactory().getStatistics().clear();
		
		List parents = s.createQuery("from Parent where name between 'bar' and 'foo' order by name desc")
			.list();
		p = (Parent) parents.get(0);
		q = (Parent) parents.get(1);

		assertFalse( Hibernate.isInitialized( p.getChildren() ) );
		assertFalse( Hibernate.isInitialized( q.getChildren() ) );

		assertEquals( p.getChildren().size(), 2 );
		
		assertTrue( Hibernate.isInitialized( p.getChildren().iterator().next() ) );
				
		assertTrue( Hibernate.isInitialized( q.getChildren() ) );
		
		assertEquals( q.getChildren().size(), 2 );
		
		assertTrue( Hibernate.isInitialized( q.getChildren().iterator().next() ) );
		
		assertFalse( Hibernate.isInitialized( p.getMoreChildren() ) );
		assertFalse( Hibernate.isInitialized( q.getMoreChildren() ) );

		assertEquals( p.getMoreChildren().size(), 0 );
		
		assertTrue( Hibernate.isInitialized( q.getMoreChildren() ) );
	
		assertEquals( q.getMoreChildren().size(), 2 );
		
		assertTrue( Hibernate.isInitialized( q.getMoreChildren().iterator().next() ) );
		
		assertEquals( 3, sessionFactory().getStatistics().getPrepareStatementCount() );

		Child c = (Child) p.getChildren().get(0);
		c.getFriends().size();

		s.delete(p);
		s.delete(q);		

		t.commit();
		s.close();
	}

	@Test
	public void testSubselectFetchNamedParam() {
		Session s = openSession();
		Transaction t = s.beginTransaction();
		Parent p = new Parent("foo");
		p.getChildren().add( new Child("foo1") );
		p.getChildren().add( new Child("foo2") );
		Parent q = new Parent("bar");
		q.getChildren().add( new Child("bar1") );
		q.getChildren().add( new Child("bar2") );
		q.getMoreChildren().addAll( p.getChildren() );
		s.persist(p); 
		s.persist(q);
		t.commit();
		s.close();
		
		s = openSession();
		t = s.beginTransaction();
		
		sessionFactory().getStatistics().clear();
		
		List parents = s.createQuery("from Parent where name between :bar and :foo order by name desc")
			.setParameter("bar", "bar")
			.setParameter("foo", "foo")
			.list();
		p = (Parent) parents.get(0);
		q = (Parent) parents.get(1);

		assertFalse( Hibernate.isInitialized( p.getChildren() ) );
		assertFalse( Hibernate.isInitialized( q.getChildren() ) );

		assertEquals( p.getChildren().size(), 2 );
		
		assertTrue( Hibernate.isInitialized( p.getChildren().iterator().next() ) );
				
		assertTrue( Hibernate.isInitialized( q.getChildren() ) );
		
		assertEquals( q.getChildren().size(), 2 );
		
		assertTrue( Hibernate.isInitialized( q.getChildren().iterator().next() ) );
		
		assertFalse( Hibernate.isInitialized( p.getMoreChildren() ) );
		assertFalse( Hibernate.isInitialized( q.getMoreChildren() ) );

		assertEquals( p.getMoreChildren().size(), 0 );
		
		assertTrue( Hibernate.isInitialized( q.getMoreChildren() ) );
	
		assertEquals( q.getMoreChildren().size(), 2 );
		
		assertTrue( Hibernate.isInitialized( q.getMoreChildren().iterator().next() ) );
		
		assertEquals( 3, sessionFactory().getStatistics().getPrepareStatementCount() );

		Child c = (Child) p.getChildren().get(0);
		c.getFriends().size();

		s.delete(p);
		s.delete(q);		

		t.commit();
		s.close();
	}

	@Test
	public void testSubselectFetchPosParam() {
		Session s = openSession();
		Transaction t = s.beginTransaction();
		Parent p = new Parent("foo");
		p.getChildren().add( new Child("foo1") );
		p.getChildren().add( new Child("foo2") );
		Parent q = new Parent("bar");
		q.getChildren().add( new Child("bar1") );
		q.getChildren().add( new Child("bar2") );
		q.getMoreChildren().addAll( p.getChildren() );
		s.persist(p); 
		s.persist(q);
		t.commit();
		s.close();
		
		s = openSession();
		t = s.beginTransaction();
		
		sessionFactory().getStatistics().clear();
		
		List parents = s.createQuery("from Parent where name between ? and ? order by name desc")
			.setParameter(0, "bar")
			.setParameter(1, "foo")
			.list();
		p = (Parent) parents.get(0);
		q = (Parent) parents.get(1);

		assertFalse( Hibernate.isInitialized( p.getChildren() ) );
		assertFalse( Hibernate.isInitialized( q.getChildren() ) );

		assertEquals( p.getChildren().size(), 2 );
		
		assertTrue( Hibernate.isInitialized( p.getChildren().iterator().next() ) );
				
		assertTrue( Hibernate.isInitialized( q.getChildren() ) );
		
		assertEquals( q.getChildren().size(), 2 );
		
		assertTrue( Hibernate.isInitialized( q.getChildren().iterator().next() ) );
		
		assertFalse( Hibernate.isInitialized( p.getMoreChildren() ) );
		assertFalse( Hibernate.isInitialized( q.getMoreChildren() ) );

		assertEquals( p.getMoreChildren().size(), 0 );
		
		assertTrue( Hibernate.isInitialized( q.getMoreChildren() ) );
	
		assertEquals( q.getMoreChildren().size(), 2 );
		
		assertTrue( Hibernate.isInitialized( q.getMoreChildren().iterator().next() ) );
		
		assertEquals( 3, sessionFactory().getStatistics().getPrepareStatementCount() );

		Child c = (Child) p.getChildren().get(0);
		c.getFriends().size();

		s.delete(p);
		s.delete(q);		

		t.commit();
		s.close();
	}

	@Test
	public void testSubselectFetchWithLimit() {
		Session s = openSession();
		Transaction t = s.beginTransaction();
		Parent p = new Parent("foo");
		p.getChildren().add( new Child("foo1") );
		p.getChildren().add( new Child("foo2") );
		Parent q = new Parent("bar");
		q.getChildren().add( new Child("bar1") );
		q.getChildren().add( new Child("bar2") );
		Parent r = new Parent("aaa");
		r.getChildren().add( new Child("aaa1") );
		s.persist(p); 
		s.persist(q);
		s.persist(r);
		t.commit();
		s.close();
		
		s = openSession();
		t = s.beginTransaction();
		
		sessionFactory().getStatistics().clear();
		
		List parents = s.createQuery("from Parent order by name desc")
			.setMaxResults(2)
			.list();
		p = (Parent) parents.get(0);
		q = (Parent) parents.get(1);
		assertFalse( Hibernate.isInitialized( p.getChildren() ) );
		assertFalse( Hibernate.isInitialized( p.getMoreChildren() ) );
		assertFalse( Hibernate.isInitialized( q.getChildren() ) );
		assertFalse( Hibernate.isInitialized( q.getMoreChildren() ) );
		assertEquals( p.getMoreChildren().size(), 0 );
		assertEquals( p.getChildren().size(), 2 );
		assertTrue( Hibernate.isInitialized( q.getChildren() ) );
		assertTrue( Hibernate.isInitialized( q.getMoreChildren() ) );
		
		assertEquals( 3, sessionFactory().getStatistics().getPrepareStatementCount() );
		
		r = (Parent) s.get( Parent.class, r.getName() );
		assertTrue( Hibernate.isInitialized( r.getChildren() ) );
		assertFalse( Hibernate.isInitialized( r.getMoreChildren() ) );
		assertEquals( r.getChildren().size(), 1 );
		assertEquals( r.getMoreChildren().size(), 0 );

		s.delete(p);
		s.delete(q);		
		s.delete(r);
		
		t.commit();
		s.close();
	}

	@Test
	public void testManyToManyCriteriaJoin() {
		Session s = openSession();
		Transaction t = s.beginTransaction();
		Parent p = new Parent("foo");
		p.getChildren().add( new Child("foo1") );
		p.getChildren().add( new Child("foo2") );
		Parent q = new Parent("bar");
		q.getChildren().add( new Child("bar1") );
		q.getChildren().add( new Child("bar2") );
		q.getMoreChildren().addAll( p.getChildren() );
		s.persist(p); 
		s.persist(q);
		t.commit();
		s.close();
		
		s = openSession();
		t = s.beginTransaction();
		
		List parents = s.createCriteria(Parent.class)
			.createCriteria("moreChildren")
			.createCriteria("friends")
			.addOrder( Order.desc("name") )
			.list();

		parents = s.createCriteria(Parent.class)
			.setFetchMode("moreChildren", FetchMode.JOIN)
			.setFetchMode("moreChildren.friends", FetchMode.JOIN)
			.addOrder( Order.desc("name") )
			.list();

		s.delete( parents.get(0) );
		s.delete( parents.get(1) );

		t.commit();
		s.close();
	}

	@Test
	public void testSubselectFetchCriteria() {
		Session s = openSession();
		Transaction t = s.beginTransaction();
		Parent p = new Parent("foo");
		p.getChildren().add( new Child("foo1") );
		p.getChildren().add( new Child("foo2") );
		Parent q = new Parent("bar");
		q.getChildren().add( new Child("bar1") );
		q.getChildren().add( new Child("bar2") );
		q.getMoreChildren().addAll( p.getChildren() );
		s.persist(p); 
		s.persist(q);
		t.commit();
		s.close();
		
		s = openSession();
		t = s.beginTransaction();
		
		sessionFactory().getStatistics().clear();
		
		List parents = s.createCriteria(Parent.class)
			.add( Property.forName("name").between("bar", "foo") )
			.addOrder( Order.desc("name") )
			.list();
		p = (Parent) parents.get(0);
		q = (Parent) parents.get(1);

		assertFalse( Hibernate.isInitialized( p.getChildren() ) );
		assertFalse( Hibernate.isInitialized( q.getChildren() ) );

		assertEquals( p.getChildren().size(), 2 );
				
		assertTrue( Hibernate.isInitialized( p.getChildren().iterator().next() ) );
		
		assertTrue( Hibernate.isInitialized( q.getChildren() ) );
		
		assertEquals( q.getChildren().size(), 2 );
		
		assertTrue( Hibernate.isInitialized( q.getChildren().iterator().next() ) );
		
		assertFalse( Hibernate.isInitialized( p.getMoreChildren() ) );
		assertFalse( Hibernate.isInitialized( q.getMoreChildren() ) );

		assertEquals( p.getMoreChildren().size(), 0 );
		
		assertTrue( Hibernate.isInitialized( q.getMoreChildren() ) );
	
		assertEquals( q.getMoreChildren().size(), 2 );
		
		assertTrue( Hibernate.isInitialized( q.getMoreChildren().iterator().next() ) );
		
		assertEquals( 3, sessionFactory().getStatistics().getPrepareStatementCount() );

		Child c = (Child) p.getChildren().get(0);
		c.getFriends().size();

		s.delete(p);
		s.delete(q);		

		t.commit();
		s.close();
	}

}