/** Sends given query to MySQL server
     * @param string format
     * @param mixed arguments
     * @return MySQLResult
    */
    static public function query($format) {

        if( !is_resource(self::$connection) ) throw new Exception('Connection to MySQL server has not been established yet');

        $arguments = func_get_args();
        unset($arguments[0]);

        // Renumber arguments array
        $arguments = array_merge($arguments, array());

        // Escape strings
        foreach($arguments as $i=>$arg) {
            if( is_string($arg) ) $arguments[$i] = mysql_escape_string($arg);
        }

        $sql = vsprintf($format, $arguments);
        $result = @mysql_query($sql, self::$connection);
        if( !$result ) throw new Exception(mysql_error(), mysql_errno());
        return new MySQLResult($result);

    }