insert into topic(topicid , usersid , articleid , contents , addtime ) values(#{topicid} , #{usersid} , #{articleid} , #{contents} , #{addtime} ) update topic set usersid=#{usersid} , articleid=#{articleid} , contents=#{contents} , addtime=#{addtime} where topicid=#{topicid} delete from topic where topicid = #{topicid} select a.* , b.username , c.title from topic a , users b , article c where 1=1 and a.usersid = b.usersid and a.articleid = c.articleid order by topicid desc select a.* , b.username , c.title from topic a , users b , article c where 1=1 and a.usersid = b.usersid and a.articleid = c.articleid and topicid=#{topicid} order by topicid desc select a.* , b.username , c.title from topic a , users b , article c where 1=1 and a.usersid = b.usersid and a.articleid = c.articleid and a.usersid = #{usersid} and a.articleid = #{articleid} and a.contents = #{contents} and a.addtime = #{addtime} select a.* , b.username , c.title from topic a , users b , article c where 1=1 and a.usersid = b.usersid and a.articleid = c.articleid and b.username like CONCAT('%', CONCAT(#{usersid}, '%')) and c.title like CONCAT('%', CONCAT(#{articleid}, '%')) and a.contents like CONCAT('%', CONCAT(#{contents}, '%')) and a.addtime like CONCAT('%', CONCAT(#{addtime}, '%'))