Fixed django#18465 -- Set date formats correctly on Oracle

Correctly configure NLS_SESSION_PARAMETERS to format Date and DateTime on Oracle backend. Thanks to Josh Smeaton for report & patch.

Author: jarshwah

django/db/backends/oracle/base.py

@@ -479,13 +479,19 @@ def _cursor(self):
  del conn_params['use_returning_into']
  self.connection = Database.connect(conn_string, **conn_params)
  cursor = FormatStylePlaceholderCursor(self.connection)
+ # Set the territory first. The territory overrides NLS_DATE_FORMAT
+ # and NLS_TIMESTAMP_FORMAT to the territory default. When all of
+ # these are set in single statement it isn't clear what is supposed
+ # to happen.
+ cursor.execute("ALTER SESSION SET NLS_TERRITORY = 'AMERICA'")
  # Set oracle date to ansi date format. This only needs to execute
  # once when we create a new connection. We also set the Territory
- # to 'AMERICA' which forces Sunday to evaluate to a '1' in TO_CHAR().
- cursor.execute("ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS'"
- " NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH24:MI:SS.FF'"
- " NLS_TERRITORY = 'AMERICA'"
- + (" TIME_ZONE = 'UTC'" if settings.USE_TZ else ''))
+ # to 'AMERICA' which forces Sunday to evaluate to a '1' in
+ # TO_CHAR().
+ cursor.execute(
+ "ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS'"
+ " NLS_TIMESTAMP_FORMAT = 'YYYY-MM-DD HH24:MI:SS.FF'"
+ + (" TIME_ZONE = 'UTC'" if settings.USE_TZ else ''))
 
  if 'operators' not in self.__dict__:
  # Ticket #14149: Check whether our LIKE implementation will

tests/regressiontests/backends/tests.py

@@ -66,6 +66,18 @@ def test_client_encoding(self):
  self.assertEqual(connection.connection.encoding, "UTF-8")
  self.assertEqual(connection.connection.nencoding, "UTF-8")
 
+ @unittest.skipUnless(connection.vendor == 'oracle',
+ "No need to check Oracle connection semantics")
+ def test_order_of_nls_parameters(self):
+ # an 'almost right' datetime should work with configured
+ # NLS parameters as per #18465.
+ c = connection.cursor()
+ query = "select 1 from dual where '1936-12-29 00:00' < sysdate"
+ # Test that the query succeeds without errors - pre #18465 this
+ # wasn't the case.
+ c.execute(query)
+ self.assertEqual(c.fetchone()[0], 1)
+
 class MySQLTests(TestCase):
  @unittest.skipUnless(connection.vendor == 'mysql',
  "Test valid only for MySQL")