静态属性和方法访问数据库类

将封装的数据库类，改写成静态属性和方法来访问
<?php
class db{
        private static $host;
private static $dbname;
private static $user;
private static $pass;
public function __construct($host,$dbname,$user,$pass){
  self::$host=$host;
  self::$dbname=$dbname;
  self::$user=$user;
  self::$pass=$pass;
  self::$connect();
}
private static  function connect(){
       mysql_connect(self::$host,self::$user,self::$pass);
  mysql_select_db(self::$dbname);
  mysql_query("set names utf8");
}
public function getAll($sql){
$result = mysql_query($sql);
$rows = array();
while($row = mysql_fetch_assoc($result)){
$rows[] = $row;
}
return $rows;
}
public function getOne($sql){
$result = mysql_query($sql);
$total = mysql_fetch_array($result);
$total_row = $total[0];
return $total_row;
}
}
?>