6-3|Python更新已有的记录

>>> user.save()  # save() returns the number of rows modified.

>>> user.id

>>> user.save()

>>> user.id

>>> huey.save()

>>> huey.id

如果你更新多个记录，使用UPDATE插询。下列例子将更新Tweet多个满足如果是昨天之前发表的实例，将它们标示为已发表，Model.update()接受关键字参数，这些

关键字个模型的字段一一对应。

>>> today = datetime.today()
>>> query = Tweet.update(is_published=True).where(Tweet.creation_date < today)
>>> query.execute()  # Returns the number of rows that were updated.
4