Small php persistence class

/*
* CREATE TABLE table_name (
*  class VARCHAR(20) PRIMARY KEY,
* val BLOB NOT NULL
* );
*/
 
class Persistence
{
	private $table = 'val';
	public function __construct(){
		$this->db = new Database($DSN);
	}
 
	public function save($classname, &;$object){
		$obj = serialize($object);
		$this->;db->;query("REPLACE INTO ".$this->table." SET class = ?, val = ?;", array($classname, $obj));
		return $this->db->num_rows();
	}
 
	public function get($classname){
		$this->db->query("SELECT val FROM ".$this->table." WHERE class = ?", $classname);
		$res = $this->db->row_obj();
		if(is_null($res))
			return false;
		return @unserialize($res->val);
	}
}

$pers = new Persistence();
if($eppclient = $pers->get(‘HTTPClient’))
    $client =& $eppclient;
else{
    $client = new HTTP_Client();
    $client->_cookieManager->serializeSessionCookies(true);
    $this->kp->save(‘HTTPClient’, $client);
}