Mybaits利用resultMap实现一对多

对于一对多的resultMap的定义

调用resultMap

    SELECT
        orders.*,
        user.username,
        user.sex,
        user.address,
        orderdetail.*
    FROM orders,
        USER,
        orderdetail
    WHERE orders.user_id = user.id AND orderdetail.orders_id = orders.id

mapper中的接口

public List findOrderAndOrderDetailResultMap() throws Exception;

Test

public class OrdersMapperCustomTest {
    private SqlSessionFactory sqlSessionFactory;
    @Before
    public void setUp() throws Exception {
        InputStream inputStream = Resources.getResourceAsStream("SqlMapConfig.xml");
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
    }
    
    @Test
    public void testFindOrderAndOrderDetailResultMap() throws Exception {
        SqlSession sqlSession = sqlSessionFactory.openSession();
        OrdersMapperCustom ordersMapperCustom = sqlSession.getMapper(OrdersMapperCustom.class);
        
        List orderList = ordersMapperCustom.findOrderAndOrderDetailResultMap();
        
        System.out.println(orderList);
    }

}