function getDBConfig($type)
 {
     if (!self::$dbConfig) {
         require 'config/config.db.php';
         self::$dbConfig = $dbConfig;
     }
     if (self::$dbConfig[$type]['db_server'] != '_SERVER_') {
         return self::$dbConfig[$type];
     }
     return self::$dbConfig['base'];
 }