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[1.4.x] Removed try-except in django.db.close_connection()

The reason was that the except clause needed to remove a connection
from the django.db.connections dict, but other parts of Django do not
expect this to happen. In addition the except clause was silently
swallowing the exception messages.

Refs #19707, special thanks to Carl Meyer for pointing out that this
approach should be taken.
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1 parent b4fb448 commit dec7dd99f095f938bc4306a0260d5b131935ad82 @akaariai akaariai committed
13 django/db/
@@ -45,14 +45,11 @@ def close_connection(**kwargs):
# Avoid circular imports
from django.db import transaction
for conn in connections:
- try:
- transaction.abort(conn)
- connections[conn].close()
- except Exception:
- # The connection's state is unknown, so it has to be
- # abandoned. This could happen for example if the network
- # connection has a failure.
- del connections[conn]
+ # If an error happens here the connection will be left in broken
+ # state. Once a good db connection is again available, the
+ # connection state will be cleaned up.
+ transaction.abort(conn)
+ connections[conn].close()
# Register an event that resets connection.queries
3  django/db/
@@ -97,9 +97,6 @@ def __getitem__(self, alias):
def __setitem__(self, key, value):
setattr(self._connections, key, value)
- def __delitem__(self, key):
- delattr(self._connections, key)
def __iter__(self):
return iter(self.databases)
13 tests/regressiontests/requests/
@@ -559,9 +559,14 @@ def test_request_finished_failed_connection(self):
def fail_horribly():
raise Exception("Horrible failure!")
conn._rollback = fail_horribly
+ try:
+ with self.assertRaises(Exception):
+ signals.request_finished.send(sender=self.__class__)
+ # The connection's state wasn't cleaned up
+ self.assertTrue(len(connection.transaction_state), 1)
+ finally:
+ del conn._rollback
+ # The connection will be cleaned on next request where the conn
+ # works again.
- # As even rollback wasn't possible the connection wrapper itself was
- # abandoned. Accessing the connections[alias] will create a new
- # connection wrapper, whch must be different than the original one.
- self.assertIsNot(conn, connections[DEFAULT_DB_ALIAS])
self.assertEqual(len(connection.transaction_state), 0)

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