Mysql查询结果顺序按in()中ID的顺序排列的实例分析

<select id="queryGBStyleByIDs" resultMap="styleMap">

    select style_num_id ,style_id,style_title,style_pic FROM gb_style where online = 1 AND is_hide = 0 and style_num_id in

    <foreach collection="styleNumIDs" item="styleNumId" separator="," open="(" close=")">

     #{styleNumId}

    </foreach>

    ORDER BY FIELD

    <foreach collection="styleNumIDs" item="styleNumId" separator="," open="(style_num_id," close=")">

      #{styleNumId}

    </foreach>

  </select>

select style_num_id ,style_id,style_title,style_pic FROM gb_style where online = 1 AND is_hide = 0 and style_num_id in (1,3,2,5)

order by field (style_num_id,1,3,2,5);