Fixed #7596. Added Model.objects.bulk_create, and make use of it in several places. This provides a performance benefit when inserting multiple objects. THanks to Russ for the review, and Simon Meers for the MySQl implementation.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16739 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/bulk_create/models.py

@@ -0,0 +1,21 @@
+from django.db import models
+
+
+class Country(models.Model):
+    name = models.CharField(max_length=255)
+    iso_two_letter = models.CharField(max_length=2)
+
+class Place(models.Model):
+    name = models.CharField(max_length=100)
+
+    class Meta:
+        abstract = True
+
+class Restaurant(Place):
+    pass
+
+class Pizzeria(Restaurant):
+    pass
+
+class State(models.Model):
+    two_letter_code = models.CharField(max_length=2, primary_key=True)