joinfetchtest.java

来自「hibernate-3.0.5 中文文档」· Java 代码 · 共 142 行

//$Id: JoinFetchTest.java,v 1.5 2005/05/21 14:22:15 oneovthafew Exp $
package org.hibernate.test.joinfetch;

import junit.framework.Test;
import junit.framework.TestSuite;

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.test.TestCase;

/**
 * @author Gavin King
 */
public class JoinFetchTest extends TestCase {
	
	public JoinFetchTest(String str) {
		super(str);
	}
	
	public void testJoinFetch() {
		Session s = openSession();
		Transaction t = s.beginTransaction();
		s.createQuery( "delete from Bid" ).executeUpdate();
		s.createQuery( "delete from Comment" ).executeUpdate();
		s.createQuery( "delete from Item" ).executeUpdate();
		t.commit();
		s.close();

		Item i = new Item("Camera");
		Bid b = new Bid(i, 100.0f);
		new Bid(i, 105.0f);
		new Comment(i, "This looks like a really good deal");
		new Comment(i, "Is it the latest version?");
		new Comment(i, "<comment deleted>");
		System.out.println( b.getTimestamp() );
		
		s = openSession();
		t = s.beginTransaction();
		s.persist(i);
		t.commit();
		s.close();
		
		getSessions().evict(Item.class);

		s = openSession();
		t = s.beginTransaction();
		i = (Item) s.get( Item.class, i.getId() );
		assertTrue( Hibernate.isInitialized( i.getBids() ) );
		assertEquals( i.getBids().size(), 2 );
		assertTrue( Hibernate.isInitialized( i.getComments() ) );
		assertEquals( i.getComments().size(), 3 );
		t.commit();
		s.close();

		getSessions().evict(Bid.class);

		s = openSession();
		t = s.beginTransaction();
		b = (Bid) s.get( Bid.class, b.getId() );
		assertTrue( Hibernate.isInitialized( b.getItem() ) );
		assertTrue( Hibernate.isInitialized( b.getItem().getComments() ) );
		assertEquals( b.getItem().getComments().size(), 3 );
		System.out.println( b.getTimestamp() );
		t.commit();
		s.close();

		getSessions().evictCollection(Item.class.getName() + ".bids");
		
		s = openSession();
		t = s.beginTransaction();
		i = (Item) s.createCriteria( Item.class )
			.setFetchMode("bids", FetchMode.SELECT)
			.setFetchMode("comments", FetchMode.SELECT)
			.uniqueResult();
		assertFalse( Hibernate.isInitialized( i.getBids() ) );
		assertFalse( Hibernate.isInitialized( i.getComments() ) );
		b = (Bid) i.getBids().iterator().next();
		assertTrue( Hibernate.isInitialized( b.getItem() ) );
		t.commit();
		s.close();
		
		s = openSession();
		t = s.beginTransaction();
		i = (Item) s.createQuery("from Item i left join fetch i.bids left join fetch i.comments").uniqueResult();
		assertTrue( Hibernate.isInitialized( i.getBids() ) );
		assertTrue( Hibernate.isInitialized( i.getComments() ) );
		assertEquals( i.getComments().size(), 3 );
		assertEquals( i.getBids().size(), 2 );
		t.commit();
		s.close();

		s = openSession();
		t = s.beginTransaction();
		Object[] row = (Object[]) s.getNamedQuery("items").list().get(0);
		i = (Item) row[0];
		assertTrue( Hibernate.isInitialized( i.getBids() ) );
		assertTrue( Hibernate.isInitialized( i.getComments() ) );
		assertEquals( i.getComments().size(), 3 );
		assertEquals( i.getBids().size(), 2 );
		t.commit();
		s.close();

		s = openSession();
		t = s.beginTransaction();
		i = (Item) s.createCriteria(Item.class).uniqueResult();
		assertTrue( Hibernate.isInitialized( i.getBids() ) );
		assertTrue( Hibernate.isInitialized( i.getComments() ) );
		assertEquals( i.getComments().size(), 3 );
		assertEquals( i.getBids().size(), 2 );
		t.commit();
		s.close();

		s = openSession();
		t = s.beginTransaction();
		s.createQuery( "delete from Bid" ).executeUpdate();
		s.createQuery( "delete from Comment" ).executeUpdate();
		s.createQuery( "delete from Item" ).executeUpdate();
		t.commit();
		s.close();

	}
	
	protected String[] getMappings() {
		return new String[] { "joinfetch/ItemBid.hbm.xml" };
	}

	protected void configure(Configuration cfg) {
		cfg.setProperty(Environment.MAX_FETCH_DEPTH, "10");
		cfg.setProperty(Environment.USE_SECOND_LEVEL_CACHE, "false");
	}

	public static Test suite() {
		return new TestSuite(JoinFetchTest.class);
	}

}