<!-- resultMap最终还是要将结果映射到pojo上，type就是指定映射到哪一个pojo -->
    <resultMap type="Orders" id="ordersResultMap">
        <result property="userId" column="user_id"/>
    </resultMap>
    
    <!-- 查询所有的orders -->
    <select id="findAllOrders" resultMap="ordersResultMap">
        select * from orders
    </select>

    /**
     * 使用resultMap
     * 查询所有的orders
     */
    @Test
    public void m04() {
        // 获取sqlSession,和Spring整理后由Spring管理
        SqlSession sqlSession = this.sqlSessionFactory.openSession();
        // 从sqlSession中获取Mapper接口的代理对象
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);

        // 执行查询
        List<Orders> orders = userMapper.findAllOrders();
        for (Orders order : orders) {
            System.out.println(order);
        }

    }