Fixed #1142 -- Added multiple database support.

This monster of a patch is the result of Alex Gaynor's 2009 Google Summer of Code project.
Congratulations to Alex for a job well done.

Big thanks also go to:
 * Justin Bronn for keeping GIS in line with the changes,
 * Karen Tracey and Jani Tiainen for their help testing Oracle support
 * Brett Hoerner, Jon Loyens, and Craig Kimmerer for their feedback.
 * Malcolm Treddinick for his guidance during the GSoC submission process.
 * Simon Willison for driving the original design process
 * Cal Henderson for complaining about ponies he wanted.

... and everyone else too numerous to mention that helped to bring this feature into fruition.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@11952 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/introspection/tests.py

@@ -1,5 +1,5 @@
 from django.conf import settings
-from django.db import connection
+from django.db import connection, DEFAULT_DB_ALIAS
 from django.test import TestCase
 from django.utils import functional
 
@@ -80,7 +80,7 @@ class IntrospectionTests(TestCase):
                           ['IntegerField', 'CharField', 'CharField', 'CharField', 'BigIntegerField'])
 
     # Regression test for #9991 - 'real' types in postgres
-    if settings.DATABASE_ENGINE.startswith('postgresql'):
+    if settings.DATABASES[DEFAULT_DB_ALIAS]['ENGINE'].startswith('django.db.backends.postgresql'):
         def test_postgresql_real_type(self):
             cursor = connection.cursor()
             cursor.execute("CREATE TABLE django_ixn_real_test_table (number REAL);")