def get_last_tid(self):
        try:
            spec = {'tid': {'$gt': 0}}
            sort = [('tid', -1)]
            row = self.db.docs.find_one(spec, sort=sort)
        except Exception as e:
            raise DatabaseException(e)
        if row:
            return row['tid']
        return 0
def __init__(self, parent, window):
		self._parent = parent
		self._window = window
		self._application = self._parent._application

		# create user interface
		self._container = gtk.VBox(False, 5)
		self._controls = gtk.HBox(False, 5)

		separator = gtk.HSeparator()

		# pack interface
		self._container.pack_end(separator, False, False, 0)
		self._container.pack_end(self._controls, False, False, 0)