t.id as id, t.object_id as objectId, t.unit_name as unitName, t.unit_address as unitAddress, t.project_work as projectWork SELECT a.*,b.id download_id,b.download_url,b.file_name FROM com_project_sub a left join com_download b on a.file_id=b.id where object_id=#{objectId} order by a.show_index asc