public function triggerError($iErrorNumber = 0, $sErrorString = '', $sErrorFile = '', $iErrorLine = 0)
    {
        //  PHP5.6 doesn't like $this->sDriverClass::error()
        $sDriverClass = static::$sDriverClass;
        $sDriverClass::error($iErrorNumber, $sErrorString, $sErrorFile, $iErrorLine);
    }