织梦DEDECMS文档关键词频率不能修改的解决方法

//更新链接网址 
if($rpurl!=$rpurlold) 
{ 
$query1 = "UPDATE `cn_keywords` SET rpurl='$rpurl' WHERE aid='$aid' "; 
$dsql->ExecuteNoneQuery($query1); 
} 

//更新链接网址、频率 
$rank = ${'rank_'.$aid}; 
if($rpurl!=$rpurlold) 
{ 
$query1 = "UPDATE `cn_keywords` SET rpurl='$rpurl',rank='$rank' WHERE aid='$aid' "; 
$dsql->ExecuteNoneQuery($query1); 
} 
else 
{ 
$query1 = "UPDATE `cn_keywords` SET rank='$rank' WHERE aid='$aid' "; 
$dsql->ExecuteNoneQuery($query1); 
}