public static function getDbCon()
 {
     if (self::$m_dbCon == null) {
         self::$m_dbCon = mysql_connect(RingsideApiConfig::$db_server, RingsideApiConfig::$db_username, RingsideApiConfig::$db_password);
         if (!self::$m_dbCon) {
             throw new Exception('The service is not available at this time : db connect failure ' . mysql_error(), mysql_errno());
         }
         if (!mysql_select_db(RingsideApiConfig::$db_name, self::$m_dbCon)) {
             echo "error selecting" . mysql_error();
             throw new Exception('The service is not available at this time : db catalog failure ' . mysql_error(), mysql_errno());
         }
     }
     return self::$m_dbCon;
 }