DEDECMS给list标签加上多字段排序功能

//假如不消默认的sortrank或id排序，利用连系查询（数据量大时很是迟钝）
       if(preg_match('/hot|click|lastpost|title/', $orderby))
       {
           $query = "SELECT arc.*,tp.typedir,tp.typename,tp.isdefault,tp.defaultname,
          tp.namerule,tp.namerule2,tp.ispart,tp.moresite,tp.siteurl,tp.sitepath
          $addField
          FROM `js_archives` arc
          LEFT JOIN `js_arctype` tp ON arc.typeid=tp.id
          $addJoin
          WHERE {$this->addSql} $ordersql LIMIT $limitstart,$row";
       }
       //普通环境先从arctiny表查出ID，然后按ID查询（速度很是快）
       else
       {
           $t1 = ExecTime();
           $ids = array();
           $query = "SELECT id FROM `js_arctiny` arc WHERE {$this->addSql} $ordersql LIMIT $limitstart,$row ";
           $this->dsql->SetQuery($query);
           $this->dsql->Execute();
           while($arr=$this->dsql->GetArray())
           {
               $ids[] = $arr['id'];
           }
           $idstr = join(',',$ids);
           if($idstr=='')
           {
              return '';
         }
           else
           {
               $query = "SELECT arc.*,tp.typedir,tp.typename,tp.corank,tp.isdefault,tp.defaultname,
                      tp.namerule,tp.namerule2,tp.ispart,tp.moresite,tp.siteurl,tp.sitepath
                      $addField
                      FROM `js_archives` arc LEFT JOIN `js_arctype` tp ON arc.typeid=tp.id
                      $addJoin
                      WHERE arc.id in($idstr) $ordersql ";
           }
           $t2 = ExecTime();
           //echo $t2-$t1;
  
       }

else if($orderby=="default"){
            $ordersql=" ORDER BY arc.sortrank $orderWay";
        }
        else{
           $ordersql=" ORDER BY ".$orderby.",arc.sortrank $orderWay";
        }