我姓王隔壁却没有少妇
三种方法：
1. Session session=new Configuration().configure().buildSessionFactory().openSession();
session.get(类名.class,new Integer(1));
2.1. Session session=new Configuration().configure().buildSessionFactory().openSession();
Query q=session.createQuery("From 类名");
List list=q.list();
3.
Session session=new Configuration().configure().buildSessionFactory().openSession();
Criteria c=session.createCriteria(类名.class);
c.add(Expression.eq(属性, 条件值))
