mirrors/django
1
0
Fork 0
mirror of https://github.com/django/django.git synced 2025-12-01 07:48:28 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 2

Fixed #20091 -- Oracle null promotion for empty strings

Browse source
This commit is contained in:
Anssi Kääriäinen 2013-03-24 22:59:44 +02:00
parent a4b8a4b632
commit e17fa9e877
2 changed files with 16 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

8
django/db/models/sql/query.py
View file

@ -1078,6 +1078,14 @@ class Query(object):
elif isinstance(value, ExpressionNode):
# If value is a query expression, evaluate it
value = SQLEvaluator(value, self, reuse=can_reuse)
# For Oracle '' is equivalent to null. The check needs to be done
# at this stage because join promotion can't be done at compiler
# stage. Using DEFAULT_DB_ALIAS isn't nice, but it is the best we
# can do here. Similar thing is done in is_nullable(), too.
if (connections[DEFAULT_DB_ALIAS].features.interprets_empty_strings_as_nulls and
lookup_type == 'exact' and value == ''):
value = True
lookup_type = 'isnull'
for alias, aggregate in self.aggregates.items():
if alias in (parts[0], LOOKUP_SEP.join(parts)):