时间：2021-03-19 09:46:17 | 栏目：Mysql | 点击：次
xml问价中查询数据中包含list，需要使用collection
<resultMap id="XX" type="com.XXX.XXXX">
<id column="o_id" jdbcType="BIGINT" property="id" />
<result column="o_user_id" jdbcType="BIGINT" property="userId" />
....
<collection property="orderProductList" ofType="com.XXXXXX.XXXXX">
<id column="p_id" jdbcType="BIGINT" property="id" />
<result column="p_order_id" jdbcType="BIGINT" property="orderId" />
....
</collection>
</resultMap>
这样的查询系统封装的通用分页查询是不对的，所以需要自己sql中加入分页解决
<select id="XXX" resultMap="OrderListMap">
SELECT
you.nick_name,
yo.id o_id,
yo.user_id o_user_id
FROM
(
SELECT * FROM
youpin_order
WHERE
1 = 1
<if test="status != null">
and `status` = #{status}
</if>
<if test="page != null and limit != null">
LIMIT #{page},
#{limit}
</if>
) yo
LEFT JOIN XXX yop ON yo.id = yop.order_id
LEFT JOIN XXXX you ON yo.user_id = you.id
</select>
传入参数的时候需要计算
(offset - 1) * limit, limit
总结