Used symbolic constants for psycopg2 isolation levels.

Django used the value 1 = ISOLATION_LEVEL_READ_UNCOMMITTED in some places, but
PostgreSQL doesn't provide "read uncommited", it uses "read committed" instead:
http://www.postgresql.org/docs/9.1/static/transaction-iso.html. For clarity,
this commit uses ISOLATION_LEVEL_READ_COMMITTED = 2 where 1 was previously used.



git-svn-id: http://code.djangoproject.com/svn/django/trunk@17112 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 4 insertions, 1 deletions

diff --git a/django/db/backends/postgresql_psycopg2/creation.py b/django/db/backends/postgresql_psycopg2/creation.py
index e4e7428ea7..ca389b9046 100644
--- a/django/db/backends/postgresql_psycopg2/creation.py
+++ b/django/db/backends/postgresql_psycopg2/creation.py
@@ -1,3 +1,5 @@
+import psycopg2.extensions
+
 from django.db.backends.creation import BaseDatabaseCreation
 from django.db.backends.util import truncate_name
 
@@ -81,4 +83,5 @@ class DatabaseCreation(BaseDatabaseCreation):
     def _prepare_for_test_db_ddl(self):
         """Rollback and close the active transaction."""
         self.connection.connection.rollback()
-        self.connection.connection.set_isolation_level(0)
+        self.connection.connection.set_isolation_level(
+                psycopg2.extensions.ISOLATION_LEVEL_AUTOCOMMIT)