Добрый вечер!

мой класс работы с базой

header('Content-Type: text/html; charset=utf8');
include_once (ROOT_DIR.'global.php');
Class MySQL{ 
     public function __construct(){
        $result=mysql_connect(DB_HOST, DB_NAME, DB_PASS) or die("Error: Can't connect to MySQL!");
        @mysql_query ("set character_set_client='".CHARACTER."'");
        @mysql_query ("set character_set_results='".CHARACTER."'");
        @mysql_query ("set collation_connection='".CHARACTER_FULL."'");    
        $result.=mysql_select_db(DB_NAME) or die("Error: There is no database with the same name!");
        mysql_query("SET NAMES '".CHARACTER."'"); 
        return $result;
    }
    
    static public function query($query,$r= null,$mf =null){
    $result=mysql_query($query) or die(mysql_error());
        if(!$r or $r=='res'){
        return $result;
        }elseif($r=='row' && $mf == 'array'){
          $row = mysql_fetch_array($result);
        return $row;   
        }elseif($r=='row' && $mf == 'cont'){
        $row = mysql_fetch_assoc($result);
        return count($row);   
        }elseif($r=='row' && $mf == 'assoc'){
        $row =  mysql_fetch_assoc($result);
        return $row;    
        }

    }
    
     public function __destruct(){
         mysql_close();
     } 
}

вход

public function enter($login, $upass){  
 $MySql =  new MySQL();
$protection = new protections(); 
$global_function = new global_function(); 
$languages = new languages();

$this->ulogin= $protection->sip($login);
$password= $protection->sip($global_function->hiddenpassword($global_function->rus2translit($password)), true); 
$this->upassword = $protection->mdmdsha($password.$this->ulogin.SALT);
if($total = $MySql->query("SELECT * FROM ".PREF."users WHERE ulogin='".$this->ulogin."' AND upassword='".$this->upassword."'", 'row', 'cont') != 1){return $languages->output_languages('3');}else{ 
$row = $MySql->query("SELECT * FROM ".PREF."users WHERE ulogin='".$this->ulogin."'", 'row', 'assoc');
setcookie('id', ''.$row['id'].'',time()+(315360000), "/");  
setcookie('name', ''.$row['name'].'',time()+(315360000), "/"); 
setcookie('ulogin', ''.$this->ulogin, "/"); 
setcookie('upassword_cookie', ''.$protection->sip($protection->mdmdsha($this->upassword.$row['salt'].$row['id'].$this->ip).'',time()+(315360000), true), "/"); 
unset($row); 
unset($MySql);
return true;  
}  
}

выдает

Warning: mysql_query() [function.mysql-query]: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) in /home/www/z26/htdocs/di-it.ru/system/includes/MySql.php on line 16

Warning: mysql_query() [function.mysql-query]: A link to the server could not be established in /home/www/z26/htdocs/di-it.ru/system/includes/MySql.php on line 16
Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
Warning: mysql_close(): no MySQL-Link resource supplied in /home/www/z26/htdocs/di-it.ru/system/includes/MySql.php on line 33

Подскажите пожалуйста, в чем причина? и как исправить?