protected function updateMessageLabel()
    {
        if (!$this->_message) {
            return;
        }
        $this->_message->setLabel(str_replace(array('%label%',
                                                    '%totalCount%',
                                                    '%totalDuration%'),
                                              array($this->_label,
                                                    $this->getTotalNumQueries(),
                                                    (string)round($this->_totalElapsedTime,5)),
                                              $this->_label_template));
    }