zend_db中获取结果集，如何获取结果集的条数

[woannima]

用count好像不行啊，始终返回1，请问如何解决啊

public function searchFri($p_user,$p_acc){
      $frseq = $this->_db->fetchAssoc(
               "SELECT user_account,user_seq,user_name,user_iconpath,user_iconname  FROM t_user WHERE user_account = :user",
               array('user' => $p_acc)
               );
      if(count($frseq)<=0)
         return '0';

      else{
         $select = $this->_db->fetchAssoc("SELECT * FROM t_relation WHERE relation_user = :user and relation_friend = :friend  and relation_public=0",array('user'=>$p_user,'friend'=>$frseq['user_seq']));
         if(!count($select)){
            return '1';
         }
         else
            return $frseq;
      }
   }

[ruanchao]

$num  = $this->db->fetchRow('select count(id) as num from table where .... ' );

echo $num['num'];