public function GetRandRowData(){
    $rt = \Phpcmf\Service::M()->db->query("select * from dr_表 order by rand() limit 1");
        if ($rt) {
            $rows = $rt->getResultArray();
            return $rows['指定字段'];
        }
    }

{module module=xxx field=title,url order=rand() num=1}
    {$t.title}
{/module}