private function open_connection()
 {
     $SERVIDOR = filter_input_array(INPUT_SERVER);
     $PATH = $SERVIDOR['DOCUMENT_ROOT'] . "/kamarena/quiniclubs_server";
     include "{$PATH}/core/adodb5/adodb.inc.php";
     $bd = NewADOConnection("mysql");
     $bd->Connect(self::$db_host, self::$db_user, self::$db_pass, self::$db_name);
     mysql_query("SET NAMES 'utf8'");
     self::$conn = $bd;
 }