update download download_name=#{downloadName}, download_url=#{downloadUrl}, download_brief=#{downloadBrief}, dir_id=#{dirId}, download_img=#{downloadImg} id = #{id} select do.id,do.download_name,do.download_brief,do.download_url,d.dir_name from download as do inner join (select id,dir_name,dir_img,dir_addtime,dir_iden from directory) as d on do.dir_id = d.id where d.dir_iden = 3 select count(1) from download where download_name =#{downloadName}