mysql一对多关联查询分页错误问题的解决方法

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

以上所述是小编给大家介绍的mysql一对多关联查询分页错误问题的解决方法，希望对大家有所帮助