python - 如果丢失，强制 Django 重新打开数据库连接

Question

在我的 Python-Django 网络应用程序中，有时数据库会断开连接(与我的测试环境相关的问题，不太稳定......)并且我的网络应用程序给我这个错误:

  File "/usr/lib/python3.6/site-packages/django/db/backends/postgresql/base.py", line 222, in create_cursor,
django.db.utils.InterfaceError: connection already closed,
    cursor = self.connection.cursor()

现在，我如何告诉 Django 重试打开连接并继续？似乎 django 仍然停留在这一点上......

谢谢。

Answer 1

没有办法告诉 Django 它应该重试连接错误。相反，它被设计为简单地在那个请求上失败。来自 the documentation :

If any database errors have occurred while processing the requests, Django checks whether the connection still works, and closes it if it doesn’t. Thus, database errors affect at most one request; if the connection becomes unusable, the next request gets a fresh connection.

但是，如果您遵循文档中的建议，这应该不是问题:

If your database terminates idle connections after some time, you should set CONN_MAX_AGE to a lower value, so that Django doesn’t attempt to use a connection that has been terminated by the database server.