getloadtest.java

介绍了hibernate的入门有一些基本常用的事例

//$Id: GetLoadTest.java,v 1.1 2005/04/11 17:08:14 oneovthafew Exp $
package org.hibernate.test.ops;

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

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.event.ejb3.EJB3AutoFlushEventListener;
import org.hibernate.event.ejb3.EJB3FlushEventListener;
import org.hibernate.test.TestCase;

/**
 * @author Gavin King
 */
public class GetLoadTest extends TestCase {
	
	public GetLoadTest(String str) {
		super(str);
	}
	
	public void testGetLoad() {
		clearCounts();
		
		Session s = openSession();
		Transaction tx = s.beginTransaction();
		Employer emp = new Employer();
		s.persist(emp);
		Node node = new Node("foo");
		Node parent = new Node("bar");
		parent.addChild(node);
		s.persist(parent);
		tx.commit();
		s.close();
		
		s = openSession();
		tx = s.beginTransaction();
		emp = (Employer) s.get(Employer.class, emp.getId());
		assertTrue( Hibernate.isInitialized(emp) );
		assertFalse( Hibernate.isInitialized(emp.getEmployees()) );
		node = (Node) s.get(Node.class, node.getName());
		assertTrue( Hibernate.isInitialized(node) );
		assertFalse( Hibernate.isInitialized(node.getChildren()) );
		assertFalse( Hibernate.isInitialized(node.getParent()) );
		assertNull( s.get(Node.class, "xyz") );
		tx.commit();
		s.close();

		s = openSession();
		tx = s.beginTransaction();
		emp = (Employer) s.load(Employer.class, emp.getId());
		emp.getId();
		assertFalse( Hibernate.isInitialized(emp) );
		node = (Node) s.load(Node.class, node.getName());
		assertEquals( node.getName(), "foo" );
		assertFalse( Hibernate.isInitialized(node) );
		tx.commit();
		s.close();
	
		s = openSession();
		tx = s.beginTransaction();
		emp = (Employer) s.get("org.hibernate.test.ops.Employer", emp.getId());
		assertTrue( Hibernate.isInitialized(emp) );
		node = (Node) s.get("org.hibernate.test.ops.Node", node.getName());
		assertTrue( Hibernate.isInitialized(node) );
		tx.commit();
		s.close();

		s = openSession();
		tx = s.beginTransaction();
		emp = (Employer) s.load("org.hibernate.test.ops.Employer", emp.getId());
		emp.getId();
		assertFalse( Hibernate.isInitialized(emp) );
		node = (Node) s.load("org.hibernate.test.ops.Node", node.getName());
		assertEquals( node.getName(), "foo" );
		assertFalse( Hibernate.isInitialized(node) );
		tx.commit();
		s.close();
		
		assertFetchCount(0);
	}

	private void clearCounts() {
		getSessions().getStatistics().clear();
	}
	
	private void assertFetchCount(int count) {
		int fetches = (int) getSessions().getStatistics().getEntityFetchCount();
		assertEquals(count, fetches);
	}
		
	protected void configure(Configuration cfg) {
		cfg.setListener( "flush", new EJB3FlushEventListener() );
		cfg.setListener( "auto-flush", new EJB3AutoFlushEventListener() );
		cfg.setProperty(Environment.GENERATE_STATISTICS, "true");
		cfg.setProperty(Environment.STATEMENT_BATCH_SIZE, "0");		
	}
	
	protected String[] getMappings() {
		return new String[] {
			"ops/Node.hbm.xml",
			"ops/Employer.hbm.xml"
		};
	}

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

	public String getCacheConcurrencyStrategy() {
		return null;
	}

}