判断状态的标准
oid 和 session相关性
public class HibernateUtils {
private static SessionFactory sessionFactory=null;
static{
//获取config 加载配置文件
Configuration configure = new Configuration().configure();
sessionFactory = configure.buildSessionFactory();
}
//获取session
public static Session getSession(){
Session session = sessionFactory.openSession();
return session;
}
}瞬时态
瞬时态------持久态
save和saveOrUpdata操作
@Test//瞬时态转化为持久态
public void test02(){
//获取连接
Session session = HibernateUtils.getSession();
//开启事务
Transaction ts = session.beginTransaction();
//处于游离态 没有oid 与session无关
User user=new User("zhangsan111","123456789","zhangfei","[email protected]","15029021367",new Date(),"M",1,"0");
session.save(user);//处于持久态 与session有关 有oid (瞬时态转化为持久态)
ts.commit();
session.close();
}
瞬时态------游离态 只需要给一个oid (主键生成策略进行了限定 这样我们只能通过持久态进行转换)
@Test//瞬时态转化为游离态态
public void test02(){
//获取连接
Session session = HibernateUtils.getSession();
//开启事务
Transaction ts = session.beginTransaction();
//处于游离态 没有oid 与session无关
User user=new User("zhangsan111","123456789","zhangfei","[email protected]","15029021367",new Date(),"M",1,"0");
session.save(user);//处于持久态 与session有关 有oid (瞬时态转化为持久态)
ts.commit();
session.close();
System.out.println(user.getUid());//处于游离态 有oid session关闭
}
持久态
持久态----瞬时态 delete操作
@Test//持久态转化为瞬时态
public void test03(){
//获取连接
Session session = HibernateUtils.getSession();
//开启事务
Transaction ts = session.beginTransaction();
User u=session.get(User.class,"402898a45fcec558015fcec55d5c0000");//处于持久态 与session有关 有oid (瞬时态转化为持久态)
System.out.println(u);
session.delete(u);
ts.commit();
session.close();
}
持久态----游离态 close(关闭session) clear 清除一级缓存(session) evict清除以及缓存(指定的缓存)
@Test//持久态转化为游离态
public void test03(){
//获取连接
Session session = HibernateUtils.getSession();
//开启事务
Transaction ts = session.beginTransaction();
User u=session.get(User.class,"987e21997c134dc4b6538010d101bcef");//处于持久态 与session有关 有oid (瞬时态转化为持久态)
ts.commit();
session.close();
System.out.println(u);//此时为游离态 有oid session关闭
}
游离态
游离态----持久态
@Test//游离态转化为持久态
public void test04(){
//获取连接
Session session = HibernateUtils.getSession();
//开启事务
Transaction ts = session.beginTransaction();
User u=session.get(User.class,"12");//处于持久态 与session有关 有oid (瞬时态转化为持久态)
ts.commit();
session.close();
u.setUsername("123456");//游离态
Session session1 = HibernateUtils.getSession();
//开启事务
Transaction ts1 = session1.beginTransaction();
session1.update(u);//持久态
ts1.commit();
session1.close();
}
游离态----瞬时态
@Test//游离态转化为瞬时态
public void test04(){
//获取连接
Session session = HibernateUtils.getSession();
//开启事务
Transaction ts = session.beginTransaction();
User u=session.get(User.class,"12");//处于持久态 与session有关 有oid (瞬时态转化为持久态)
ts.commit();
session.close();
u.setUsername("123456");//游离态
Session session1 = HibernateUtils.getSession();
//开启事务
Transaction ts1 = session1.beginTransaction();
session1.delete(u);//瞬时态
ts1.commit();
session1.close();
}