How to tell if your select query is within a transaction or not?

问题

In Django 1.5.x, I have a long running management command where select queries are returning stale data. I suspect this is due to the fact that they are running within a transaction that are started earlier on the db connnection. Is there a way a tell if a query runs within a transaction or it is in autocommit mode?

(this is somewhat more focused version of an earlier question I posted at https://stackoverflow.com/questions/18540099/orm-does-not-return-recent-database-changes)

回答1:

You can check if you are in a transaction by checking is_managed

if transaction.is_managed():
    print "tutsi frutsi!"

回答2:

Since Django 1.7, Connection.in_atomic_block will tell you if a connection is inside a transaction or not. It doesn't seem like this is documented, but it Works On My Machine:

from django.db import transaction
cxn = transaction.get_connection()
if cxn.in_atomic_block:
    print "We're inside a transaction!"

回答3:

Since Django 1.6 you can tell if you're in autocommit mode via transaction.get_autocommit API.

from django.db import transaction

if transaction.get_autocommit():
    pass  # We are in autocommit

来源：https://stackoverflow.com/questions/18544033/how-to-tell-if-your-select-query-is-within-a-transaction-or-not