Hibernate 实现增删改

Configuration conf = null;SessionFactory sessionFactory = null;Session session = null;Transaction tx = null;try {    conf = new Configuration().configure();    sessionFactory = conf.buildSessionFactory();     session = sessionFactory.openSession();      tx = session.beginTransaction();      session.save(user); //   session.update(user); //  session.delete(user); //  User user = (User)session.get(User.class,id);    tx.commit(); } catch (HibernateException e) {    tx.rollback();     e.printStackTrace();} finally{    session.close();      sessionFactory.close();}