/**
* devuelve una referencia a la instancia conectada
* @return object: instancia de self
*/
public static function getInstance() {
if(!self::$singleton instanceof self) {
//self::$singleton = new self(self::_DB_HOST_, self::_DB_USER_, self::_DB_PASSWD_, self::_DB_NAME_);
self::$singleton = new self(self::$host, self::$user, self::$pass, self::$db);
}
return self::$singleton;
}
