public function destroy($userId, $clientIds = array())
	{
		$clientIds = implode(',', $clientIds);

		$query = $this->_db->getQuery(true)
			->delete($this->_db->quoteName($this->_tbl))
			->where($this->_db->quoteName('userid') . ' = ' . $this->_db->quote($userId))
			->where($this->_db->quoteName('client_id') . ' IN (' . $clientIds . ')');
		$this->_db->setQuery($query);

		if (!$this->_db->execute())
		{
			$this->setError($this->_db->stderr());

			return false;
		}

		return true;
	}