使dedecms的list标签支持多字段排序

织梦list标签的orderby属性只支持按一个字段排序，如果想多字段排序的话，我对后台的PHP进行了修改，使其可以支持多字段排序，修改如下：

 

先找到文件arc.listview.class.php 在主目录include文件夹下，找到

 

  // 如果不用默认的sortrank或id排序，使用联合查询（数据量大时非常缓慢）
         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 `#@__archives` arc
           LEFT JOIN `#@__arctype` tp ON arc.typeid=tp.id
            $addJoin
           WHERE { $this ->addSql}  $ordersql  LIMIT  $limitstart , $row " ;
        }
         // 普通情况先从arctiny表查出ID，然后按ID查询（速度非常快）
         else
        {
             $t1   =  ExecTime();
             $ids   =   array ();
             $query   =   " SELECT id FROM `#@__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 `#@__archives` arc LEFT JOIN `#@__arctype` tp ON arc.typeid=tp.id
                        $addJoin
                       WHERE arc.id in( $idstr )  $ordersql   " ;
            }
             $t2   =  ExecTime();
             // echo $t2-$t1;

        }

 替换为

  if ( $orderby == " default " )
        {
             $t1   =  ExecTime();
             $ids   =   array ();
             $query   =   " SELECT id FROM `#@__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 `#@__archives` arc LEFT JOIN `#@__arctype` tp ON arc.typeid=tp.id
                        $addJoin
                       WHERE arc.id in( $idstr )  $ordersql   " ;
            }
             $t2   =  ExecTime();
             // echo $t2-$t1;

        }
          else
        {
             $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 `#@__archives` arc
           LEFT JOIN `#@__arctype` tp ON arc.typeid=tp.id
            $addJoin
           WHERE { $this ->addSql}  $ordersql  LIMIT  $limitstart , $row " ;
        }

 找到

else  {
             $ordersql = "  ORDER BY arc.sortrank  $orderWay " ;
        }

 替换为

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

 现在在模板中就可以应用了多字段排序了，

模板应用如下：

{dede:list pagesize='17' orderby='arc.title desc,arc.id'}