protected function modify(WebsiteOpinion $websiteOpinion)
 {
     $q = $this->dao->prepare('UPDATE ' . $this->table() . ' SET USERNAME = :username, COMMENT = :comment, IS_PUBLISHED = :isPublished WHERE ID = :id');
     $q->bindValue(':username', $websiteOpinion->getUsername());
     $q->bindValue(':comment', $websiteOpinion->getComment());
     $q->bindValue(':isPublished', $websiteOpinion->getIsPublished());
     $q->bindValue(':id', $websiteOpinion->id());
     $q->execute();
 }