insert into web_update(wu_info, wu_time, is_delete) values (#{updateInfo}, now(), false) update web_update set wu_info=#{info} where wu_id = #{id}; update web_update set is_delete = true where wu_id = #{id} select EXISTS(select * from web_update where wu_id = #{id}) select * from web_update where wu_id = #{id} select * from web_update order by wu_id desc select * from web_update where is_delete = false select * from web_update order by wu_id desc limit 1