public function update(SliderImage $sliderImage)
    {
        $query = $this->_db->prepare(' UPDATE t_sliderimage SET 
		name=:name, url=:url, description=:description, updated=:updated, updatedBy=:updatedBy
		WHERE id=:id') or die(print_r($this->_db->errorInfo()));
        $query->bindValue(':id', $sliderImage->id());
        $query->bindValue(':name', $sliderImage->name());
        $query->bindValue(':url', $sliderImage->url());
        $query->bindValue(':description', $sliderImage->description());
        $query->bindValue(':updated', $sliderImage->updated());
        $query->bindValue(':updatedBy', $sliderImage->updatedBy());
        $query->execute();
        $query->closeCursor();
    }