querytest2.java

实现一些hibernate底层的东西

package com.bjsxt.hibernate;

import java.util.Iterator;
import java.util.List;

import junit.framework.TestCase;

import org.hibernate.Session;

public class QueryTest2 extends TestCase {
	
	public void testQuery1()
	{
		Session session = null;
		try{
			session = HibernateUtils.getSession();
			session.beginTransaction();
			
			//使用别名查询,也可以用as命名别名
			Iterator iterator = session.createQuery( "from Student" ).iterate();
			while( iterator.hasNext() ){
				Student student = ( Student )iterator.next();
				System.out.println( student.getName() );
			}
			
			session.getTransaction().commit();
			
		}catch( Exception e ){
			e.printStackTrace();
			session.getTransaction().rollback();
		}finally{
			HibernateUtils.closeSession(session);
		}
	}
	
	public void testQuery2()
	{
		Session session = null;
		try{
			session = HibernateUtils.getSession();
			session.beginTransaction();
			
			//使用别名查询,也可以用as命名别名
			List students = session.createQuery( "from Student s" ).list();
			for( Iterator ite = students.iterator() ; ite.hasNext() ; ){
				Student student = ( Student )ite.next();
				System.out.println( student.getId() + "," + student.getName() );
			}
			
			session.getTransaction().commit();
			
		}catch( Exception e ){
			e.printStackTrace();
			session.getTransaction().rollback();
		}finally{
			HibernateUtils.closeSession(session);
		}
	}
	
	public void testQuery3()
	{
		Session session = null;
		try{
			session = HibernateUtils.getSession();
			session.beginTransaction();
			
			//使用别名查询,也可以用as命名别名
			List students = session.createQuery( "from Student s" ).list();
			for( Iterator ite = students.iterator() ; ite.hasNext() ; ){
				Student student = ( Student )ite.next();
				System.out.println( student.getId() + "," + student.getName() );
			}
			
			System.out.println( "------------------------------------------" );
			Iterator iterator = session.createQuery( "from Student" ).iterate();
			while( iterator.hasNext() ){
				Student student = ( Student )iterator.next();
				System.out.println( student.getName() );
			}
			session.getTransaction().commit();
			
		}catch( Exception e ){
			e.printStackTrace();
			session.getTransaction().rollback();
		}finally{
			HibernateUtils.closeSession(session);
		}
	}
}