擅长:python、mysql、java
<p>根据要跟踪的修改字段的数量,您可以使用<a href="https://docs.sqlalchemy.org/en/latest/orm/events.html" rel="nofollow noreferrer">ORM Events</a>实现所需的功能:</p>
<pre><code>@sa.event.listens_for(Thing.foo, 'set')
def foo_changed(target, value, oldvalue, initiator):
target.last_modified = datetime.now()
@sa.event.listens_for(Thing.baz, 'set')
def baz_changed(target, value, oldvalue, initiator):
target.last_modified = datetime.now()
</code></pre>