public function saveAuthAssignment($assignment)
	{
		$this->db->createCommand()
			->update($this->assignmentTable, array(
				'bizrule'=>$assignment->getBizRule(),
				'data'=>serialize($assignment->getData()),
			), 'itemname=:itemname AND userid=:userid', array(
				'itemname'=>$assignment->getItemName(),
				'userid'=>$assignment->getUserId()
			));
	}