本文共 1100 字，大约阅读时间需要 3 分钟。

一级缓存是 SqlSession 级别的缓存，只要 SqlSession 没有 flush 或 close，它就存在。

此处调用findById方法

@Test    public void cacheTest() throws IOException {
           inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");        sessionFactory = new SqlSessionFactoryBuilder().build(inputStream);        sqlSession = sessionFactory.openSession();        userDao = sqlSession.getMapper(IUserDao.class);        //测试一级缓存        User user1 = userDao.findById(55);        System.out.println(user1);        User user2 = userDao.findById(55);        System.out.println(user2);        System.out.println(user1==user2);        inputStream.close();        sqlSession.close();    }

//测试一级缓存        User user1 = userDao.findById(55);        System.out.println(user1);        sqlSession.close();        sqlSession = sessionFactory.openSession();        userDao = sqlSession.getMapper(IUserDao.class);        User user2 = userDao.findById(55);        System.out.println(user2);        System.out.println(user1==user2);        inputStream.close();        sqlSession.close();

转载地址：http://ociwi.baihongyu.com/