Hibernate简单的增删改查

增:

  //获得session
      Session session = HibernateUtil.getSession();
      //获得事物
      Transaction tx = session.beginTransaction();
      //构造对象
      User user = new User();
      user.setName("tmack81888");
      user.setPwd("9090909090");
      session.save(user);
      //6.提交事务
      tx.commit();
      //7.关闭session
      HibernateUtil.closeSession();

删:

//删除对象
      Session session = HibernateUtils.openSession();
      Transaction tx = session.beginTransaction();
      User user = new User();
      user = (User) session.get(User.class, 1);
      //严谨一些
      if (user!=null){
          session.delete(user);
      }
      tx.commit();
      session.close();

改:

 //更新对象
      Session session = HibernateUtils.openSession();
      Transaction tx = session.beginTransaction();
      User user = new User();
      user = session.get(User.class,5);
      user.setName("woshisheia");
      session.update(user);
      tx.commit();
      session.close();

查:

   User user = new User();
      user = session.get(User.class,5);

#注意组合主键表怎样获取这个对象
ScoreId sid = new ScoreId();
     sid.setStuId(1);
     sid.setSubjectId(8);
    ScoreResult sr = new ScoreResult();
    sr = (ScoreResult)session.get(ScoreResult.class,sid);