customer_service id, wechat_id,wechat_img_url,create_time,update_time #{wechatId},#{wechatImgUrl},now(),now() service_id = #{wechatId}, wechat_img_url = #{wechatImgUrl}, update_time =now() id = #{id} and service_id = #{wechatId} and wechat_img_url = #{wechatImgUrl} and create_time >= #{createTime} and #{updateTime} >= update_time select from order by rand() limit 1 select from wechat_id = #{customerServiceId}