@Test

	public void testSaveWith3State() {

		Teacher t = new Teacher();

		t.setName("t1");

		t.setTitle("middle");

		t.setBirthDate(new Date());  //此时t是transient状态

		Session session = sessionFactory.getCurrentSession();

		session.beginTransaction();

		session.save(t);

		System.out.println(t.getId());  //此时是persistent状态

		session.getTransaction().commit();

		System.out.println(t.getId());  //此时是detached状态

	}