织梦如何按照软件下载次数排列

织梦的arclist标签可以按照文章点击次数、发布日期、得分等进行排序,今天有个客户需要按照软件下载次数进行排列,于是做了简单二次开发,首先找到include目录下面的taglib目录里的arclist.lib.php文件在376行后加入如下代码
   if($orderby == 'down')  {   $sql = "select SUM(downloads) as down_num,id from dede_downloads group by id ORDER BY down_num DESC LIMIT 0,15";   $dsql->Execute('me',$sql);   while($drow = $dsql->GetArray() )   {    $arr[] = $drow['id'];   }   $dstr = implode(",",$arr);   if($orwhere!='')   {    $orwhere .= " AND arc.id in($dstr)";   }else{    $orwhere .= " where arc.id in($dstr)";   }   $ordersql = 'ORDER BY field(arc.id,'.$dstr.')';  }