switch (APPLICATION_ENV) {
            case 'development' :
                $this->_host = '127.0.0.1';
                $this->_user = 'yallos';
                $this->_password = 'yallos';
                break;
            case 'testing' :
                $this->_host = '192.168.2.5';
                $this->_user = 'yallos';
                $this->_password = 'yallos';
                break;
            case 'staging' :
                $this->_host = '127.0.0.1';
                $this->_user = 'yallos';
                $this->_password = 'yallos';
                break;
            case 'production' :
                // TODO: set production DB credentials
                $this->_host = '';
                $this->_user = '';
                $this->_password = 'yallos';
                break;
        }