<mapper namespace="com.kangxg.mapper.UserMapper"> <!-- 根据id 查询订单信息 --> <select id="findUserWithOrders" parameterType = "Integer" resultMap="UserWithOrdersResult"> select u.*,o.id as orders_id,o.number from tb_user u,tb_orders o where u.id = o.user_id and u.id = #{id} </select> <resultMap type="com.kangxg.po.User" id="UserWithOrdersResult"> <id property = "id" column = "id"/> <result property = "username" column = "username"/> <result property = "address" column = "address"/> <collection property = "com.kangxg.po.ordersList" ofType = "Orders"> <id property ="id" column ="orders_id"/> <result property ="number" column = "number"/> </collection> </resultMap> </mapper> 对以上代码进行优化改错
时间: 2023-12-05 07:40:10 浏览: 26
根据你提供的代码,我看到了一些问题。下面是对代码进行优化和修正的建议:
1. 首先,你需要将 `resultMap` 的定义放在 `select` 语句之前。
```xml
<mapper namespace="com.kangxg.mapper.UserMapper">
<resultMap type="com.kangxg.po.User" id="UserWithOrdersResult">
<id property="id" column="id"/>
<result property="username" column="username"/>
<result property="address" column="address"/>
<collection property="ordersList" ofType="com.kangxg.po.Orders">
<id property="id" column="orders_id"/>
<result property="number" column="number"/>
</collection>
</resultMap>
<!-- 根据id查询订单信息 -->
<select id="findUserWithOrders" parameterType="Integer" resultMap="UserWithOrdersResult">
SELECT u.*, o.id AS orders_id, o.number
FROM tb_user u, tb_orders o
WHERE u.id = o.user_id
AND u.id = #{id}
</select>
</mapper>
```
2. 注意在 `collection` 元素中,属性名应该是 `ordersList`,而不是 `com.kangxg.po.ordersList`。此外,`ofType` 属性应该指定为 `com.kangxg.po.Orders`,而不是 `Orders`。
3. 确保 `parameterType` 的值与查询语句中的参数类型匹配。
请根据这些建议对你的代码进行修改,并确保其他相关的配置也正确无误。如果还有其他问题,请提供更多的信息。