delete from message where id=#{id} select m.*, r.id rid, r.content con, r.names names, r.create_time ctime, r.avatar, r.mes_id from message m left join reply r on r.mes_id=m.id order by m.create_time desc select m.* from message m order by m.create_time desc limit 0,6 select id,content,name, create_time from message insert into message (content,name,create_time,msg_avatar) values (#{content},#{name},#{createTime},#{msg_avatar}) insert into reply (content,names,create_time,mes_id,avatar) values (#{content},#{names},#{createTime},#{mes_id},#{avatar})