Mybatis联合查询积累

要求如下：

从订单表中查询到订单id（ordersId），再通过查询中间表找到旅客id（travellerId），最后取得旅客信息。

EER

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具体实现如下

OrdersDao

@Select("select * from orders where id=#{orderId}")
    @Results({
            @Result(id = true,column = "id",property = "id"),
            @Result(column = "orderNum",property = "orderNum"),
            @Result(column = "orderTime",property = "orderTime"),
            @Result(column = "peopleCount",property = "peopleCount"),
            @Result(column = "orderDesc",property = "orderDesc"),
            @Result(column = "payType",property = "payType"),
            @Result(column = "orderStatus",property = "orderStatus"),
            @Result(column = "productId",property = "product",javaType = Product.class,one = @One(select = "com.wgl.dao.ProductDao.findById")),
            @Result(column = "touristsId",property = "tourists",javaType = Tourists.class,one = @One(select = "com.wgl.dao.TouristsDao.findById")),
            @Result(column = "id",property = "travellers",javaType = java.util.List.class,many = @Many(select = "com.wgl.dao.TravellerDao.findByOrdersId")),
    })
    Orders findById(int orderId) throws Exception;

TravellerDao

@Select("select * from traveller where id in(select travellerId from order_traveller where orderId=#{ordersId})")
    public List<Traveller> findByOrdersId(Integer ordersId);