public function getAuthAssignments($userId)
	{
		$rows=$this->db->createCommand()
			->select()
			->from($this->assignmentTable)
			->where('userid=:userid', array(':userid'=>$userId))
			->queryAll();
		$assignments=array();
		foreach($rows as $row)
		{
			if(($data=@unserialize($row['data']))===false)
				$data=null;
			$assignments[$row['itemname']]=new CAuthAssignment($this,$row['itemname'],$row['userid'],$row['bizrule'],$data);
		}
		return $assignments;
	}