DEDECMS给list标签加上多字段排序功能
dedecms的list标签orderby属性只支持按一个字段排序，假如想多个字段排序的话，就需要对PHP举办修改，使其可以支持多字段排序，修改如下：
打开include/arc.listview.class.php，找到：
//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;
}替换为：
if($orderby=="default")
{
$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
{
$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";
}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";
}此刻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'}
