有点神秘的问题。
当所有代码都放在单个文件中时，从 Flask 应用程序生成线程效果很好app.py，但是当使用工厂模式时，应用程序上下文会丢失。
Exception in thread Thread-2:
Traceback (most recent call last):
File "/XXX/flaskthreading/venv/lib/python3.9/site-packages/sqlalchemy/util/_collections.py", line 1008, in __call__
127.0.0.1 - - [07/Jun/2022 14:06:53] "GET / HTTP/1.1" 200 -
return self.registry[key]
KeyError: <greenlet.greenlet object at 0x7f4f541ad040 (otid=0x7f4f54199d00) current active started main>
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/lib/python3.9/threading.py", line 954, in _bootstrap_inner
self.run()
File "/usr/lib/python3.9/threading.py", line 892, in run
self._target(*self._args, **self._kwargs)
File "/XXX/flaskthreading/app2/views.py", line 12, in printer
print(User.query.all())
File …