public function save(){
    	$dbTable = $this->getMapper()->getDbTable();
    	if ($row = $dbTable->find($this->id)) {
            foreach ($this->_data as $key => $value) {
                $row->$key = $value;
            }
            $row->save();
        } else {
            $dbTable->insert($this->_data);
        }
    }