t.id as id, t.download_id as downloadId, t.object_id as objectId, t.file_explain as fileExplain, t.created as created SELECT a.*,b.download_url,b.file_name FROM com_file a left join com_download b on a.download_id=b.id where object_id=#{objectId} and file_type=#{fileType} order by a.show_index