public function on_update()
 {
     parent::on_update();
     $db = DB::getInstance();
     $oRef = new ReflectionClass($this->getSpiderClassName());
     $oSpider = $oRef->newInstance(array());
     $table = $oSpider->table['table'];
     $rs = Identifiable::getItemById($this->spiderID, $table);
     $oSpider = $oRef->newInstance($rs);
     $oSpider->description = strip_tags($this->description);
     $oSpider->name = $this->name;
     $oSpider->save();
 }