Hibernate 入门------简单的CRUD

Hibernate 入门——简单的CRUD

        ONE Goal , ONE Passion !

注意操作完成后,提交事务.

H3Utils 工具类:

    H3Utils 工具类    public class H3Utils {    private static Configuration config = null;    private static SessionFactory sessionFactory = null;    static {        config = new Configuration().configure();        sessionFactory = config.buildSessionFactory();    }    /**     * 获取SessionFactory对象     *      * @return     */    public static SessionFactory getSessionFactory() {        return sessionFactory;    }    /**     * 获取session对象     *      * @return     */    public static Session getSession() {        return sessionFactory.openSession();    }

测试类的初始化代码:

    private static Session session = null;    private static User user = null;    private static Transaction transaction = null;    static{        session = H3Utils.getSession();         transaction = session.beginTransaction();        user = new User();        user.setId("1");        user.setName("fy");        user.setPwd("123");    }       }

• 增:

    @Test        public void add(){        //  session.save(user);            session.persist(user);            transaction.commit();        }

• 删

如果有2条完全相同的数据,则会失败        @Test        public void delete(){            session.delete(user);            transaction.commit();        }

• 改

@Test        public void update(){            session.update(user);            transaction.commit();        }

• 查

@Test        public void select(){            session.get(User.class,"1");            session.load(User.class,"1");            transaction.commit();        }