1 第一種方法，提交了

		Teacher t = new Teacher();
		t.setName("t1");
		t.setTitle("middle");
		t.setBirthDate(new Date());
		
		Session session = sessionFactory.getCurrentSession();
		session.beginTransaction();
		session.save(t);
		System.out.println(t.getId());
		session.getTransaction().commit();
		
		Session session2 = sessionFactory.getCurrentSession();
		session2.beginTransaction();
		session2.delete(t);
		session2.getTransaction().commit();
 

		Teacher t = new Teacher();
		t.setId(1);
		
		
		Session session2 = sessionFactory.getCurrentSession();
		session2.beginTransaction();
		session2.delete(t);
		session2.getTransaction().commit();