def __init__(self):
     model=DataBaseModel()
     engine = model.db_connect()
     model.create_drawing_table(engine)
     self._session = sessionmaker(bind=engine)
     self._handlers=[DrawingItemDataBaseHanlder(self._session),
                     DrawingTagItemDataBaseHanlder(self._session),
                     DrawingIntroItemDataBaseHanlder(self._session)]