def get_next_id(self):
        try:
            query = {'_id': 'last_id'}
            update = {'$inc': {'id': 1}}
            fn = self.db.internal.find_and_modify
            row = fn(query, update, upsert=True, new=True)
        except Exception as e:
            raise DatabaseException(e)
        return row['id']
def unique_name():
    now_time = datetime.datetime.now().strftime("%Y%m%d%H%M%S")
    random_num = random.randint(0, 100)
    if random_num <= 10:
        random_num = str(0) + str(random_num)
    unique_num = str(now_time) + str(random_num)
    return unique_num