python - 关闭 SQLAlchemy ORM session 是否会回滚未提交的更改？

Question

比如下面这两个有区别吗？

session = Session() # Session is a session maker
try:
    # do some work
    session.commit()
except:
    session.rollback()
finally:
    session.close()

和

session = Session()
try:
    # do some work
    session.commit()
finally:
    session.close()

后者是我过去所做的，因为我假设在提交之前关闭 session (以防出错)与回滚具有相同的效果。但是我看到了第一种形式here .

Answer 1

Closing session 将隐式回滚当前事务状态:

The close() method issues a expunge_all(), and releases any transactional/connection resources. When connections are returned to the connection pool, transactional state is rolled back as well.

但我认为第一种形式更好，因为 explicit is better than implicit . SQLAlchemy 的作者也seems to reflect this sentiment .