mybatis 一级缓存测试

 @Test
    void test1() throws Exception {
        //取2个不同的 sqlSession
        SqlSession sqlSession1 = factory.openSession(true);
        SqlSession sqlSession2 = factory.openSession(true);

        EmpMapper mapper1 = sqlSession1.getMapper(EmpMapper.class);
        EmpMapper mapper2 = sqlSession2.getMapper(EmpMapper.class);

        Emp emp = mapper1.queryOneEmp(1001);
        System.out.println("sqlSession1第一次查询"+emp);

        Emp emp3 = mapper1.queryOneEmp(1001);
        System.out.println("sqlSession1第二次查询"+emp3);

        //sqlSession2 进行了数据修改
        Emp empParam = new Emp();
        empParam.setEmpno(1001);
        empParam.setEname("zhaoyun3333");
        mapper2.updateOneEmp(empParam);

        Emp emp4 = mapper1.queryOneEmp(1001);
        System.out.println("sqlSession1第三次次查询"+emp4);

       Emp emp2 = mapper2.queryOneEmp(1001);
        System.out.println("sqlSession2第一次查询"+emp2);
    }

结果：sqlSession1 第一次从数据库读取 zhaoyun2222
           sqlSesson1第二次从缓存中读取zhaoyun2222
           sqlSession2修改了数据 zhaoyun3333
           sqlSesson1第三次从缓存中读取zhaoyun2222
           sqlSesson2第一次从缓存中读取zhaoyun3333

 

但是如果修改的对象为 sqlSession1查询出来的对象，那么sqlSession2修改为zhaoyun1111，会直接改变sqlSession1的缓存

  @Test
    void test1() throws Exception {
        //取2个不同的 sqlSession
        SqlSession sqlSession1 = factory.openSession(true);
        SqlSession sqlSession2 = factory.openSession(true);

        EmpMapper mapper1 = sqlSession1.getMapper(EmpMapper.class);
        EmpMapper mapper2 = sqlSession2.getMapper(EmpMapper.class);

        Emp emp = mapper1.queryOneEmp(1001);
        System.out.println("sqlSession1第一次查询"+emp);

        Emp emp3 = mapper1.queryOneEmp(1001);
        System.out.println("sqlSession1第二次查询"+emp3);

        //sqlSession2 进行了数据修改
        //emp 为 mapper1.queryOneEmp(1001); 查询得到
        emp.setEname("zhaoyun111111");
        mapper2.updateOneEmp(emp);

        Emp emp4 = mapper1.queryOneEmp(1001);
        System.out.println("sqlSession1第三次次查询"+emp4);

       Emp emp2 = mapper2.queryOneEmp(1001);
        System.out.println("sqlSession2第一次查询"+emp2);
    }