hibernate中session，HQL，持久化，一对多，多对一

package com.hanqi.test;
import java.util.Date;
import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.hanqi.entity.Course;
import com.hanqi.entity.Teacher;
import com.hanqi.entity.User;

public class Test01 {
private SessionFactory sf=null;
private Session se=null;
private Transaction ts;

//在测试用例执行之前自动执行的方法
//一般用来初始化的公用对象
//前置方法
@Before
public void init()
{
			//1获取配置文件
			Configuration cfg=new Configuration().configure();
			
			
			//2注册配置
			ServiceRegistry sr=new StandardServiceRegistryBuilder().applySettings(cfg.getProperties()).build();
			
			
			//3获取SessionFactory(相当于JDBC)
			 sf =cfg.buildSessionFactory(sr);
			
			System.out.println(sf);
			
			//4产生Session
			 se=sf.openSession();
			
			//5启动事务
			 ts=se.beginTransaction();
}

//后置方法
//一般用来释放资源
@After
public void destroy()
{
			//7提交事务
	
			ts.commit();
			//8释放资源
			se.close();
			sf.close();
	
}

//测试Hibernate连接数据库


@Test
public void test() 
{
	//1获取配置文件
	Configuration cfg=new Configuration().configure();
	
	
	//2注册配置
	ServiceRegistry sr=new StandardServiceRegistryBuilder().applySettings(cfg.getProperties()).build();
	
	
	//3获取SessionFactory(相当于JDBC)
	SessionFactory sf =cfg.buildSessionFactory(sr);
	
	System.out.println(sf);
	
	//4产生Session
	Session se=sf.openSession();
	
	//5启动事务
	 ts=se.beginTransaction();
	
	//6操作事务
	//添加数据
	 //实例化的新对象处于临时状态
	User u1=new User();
	u1.setBirthday(new Date());
	u1.setMoney(2000);
	u1.setPassword("123456");
	u1.setUserName("测试一");
	
	//保存数据
	//通过save方法把对象从临时状态转成持久化状态
	se.save(u1);
	System.out.println(u1);
	
}
//测试查询方法
@Test
public void test1()
{
	//查询数据
	//提供两个参数：
	//1需要返回哪一个持久化类的实例
	//2实例的标识(数据的主键值)
	//通过Session的get方法获得的对象处于持久化状态
	User u2=(User)se.get(User.class,3);
	
	u2.setUserName("修改的");
	
	System.out.println(u2);
	
	//删除
	se.delete(u2);//使持久化对象进入删除状态
}
@Test
public void test2()
{
	User u1=(User)se.get(User.class, 4);
	
	System.out.println(u1);
	
	User u2=(User)se.get(User.class, 4);//立即加载数据
	System.out.println(u2);
}
@Test
public void test3()
{
	User u1=(User)se.load(User.class, 4);//延时加载  懒加载
	System.out.println("dsad");
	System.out.println(u1);//当使用时才加载
}

//测试游离状态


@Test
public void test4()
{
	//得到持久化状态的对象
	User u1=(User)se.get(User.class,4);
	System.out.println("u1="+u1);
	//关闭session	
	se.close();
	
	//使u1进入游离状态
	u1.setUserName("测试游离");
	//把OID置成null
	u1.setUserID(null);
	
	
	//重新创建session
	se=sf.openSession();
	//重新开启事务
	ts=se.beginTransaction();
	
	
	se.saveOrUpdate(u1);
	System.out.println(u1);		
}
//测试HQL
@Test
public void test5()
{
	//使用HQL
	//1创建Query对象
	Query qu=se.createQuery("from User where userID >? and "
			+ "userName like '测试%' order by userID");
	
	//设置占位符
	qu.setInteger(0, 10);
			
	
	//执行查询
	List<User> lu=qu.list();
	
	//方法链调用
	//lu=se.createQuery("from User where userID >?").setInteger(0, 10).list();
	
	
	for(User e:lu)
	{
		System.out.println(e);
	}
}
//测试分页
@Test
public void test6()
{
	//设置开始行号:页码=2
	//(页码-1)*每页行数
	List<User> lu=se.createQuery("from User order by userID")
			.setMaxResults(5)
			.setFirstResult(5)
			.list();


	for(User e:lu)
	{
		System.out.println(e);
	}

}
//分组查询
@Test
public void test7()
{
	List<Object>lo=se.createQuery("select userName from User group by userName").list();

	for(Object o:lo)
	{
	System.out.println(o);
	}

}
//测试投影查询
@Test
public void test8()
{
	List<Object[]>lo=se.createQuery("select userID,userName from User").list();
	
	for(Object[] o:lo)
	{
		System.out.println(o[0]+" "+o[1]);
	}
	System.out.println("dasdasadfa");
	//返回持久化对象的集合
	List<User> lu=se.createQuery("select new User(userID,userName) from User").list();

	for(User u:lu)
	{
		System.out.println(u);
		
	}

}
//测试多对一
@Test
public void test10()
{
	Course cs=(Course)se.get(Course.class,"9-888");
			System.out.println(cs);
}
//测试一对多
@Test
public void test11()
{
	Teacher  tc=(Teacher)se.get(Teacher.class,"831");
	System.out.println(tc);
}

}