php实例分享之mysql数据备份(6)

// 解锁
    private function unlock() {
        if (mysql_query ( "unlock tables" ))
            return true;
        else
            return false;
    }

// 析构
    public function __destruct() {
        if($this->conn){
            mysql_query ( "unlock tables", $this->conn );
            mysql_close ( $this->conn );
        }
    }
}
?>