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/tests.py

@@ -0,0 +1,54 @@
+from __future__ import with_statement
+
+from operator import attrgetter
+
+from django.test import TestCase, skipUnlessDBFeature
+
+from models import Country, Restaurant, Pizzeria, State
+
+
+class BulkCreateTests(TestCase):
+    def setUp(self):
+        self.data = [
+            Country(name="United States of America", iso_two_letter="US"),
+            Country(name="The Netherlands", iso_two_letter="NL"),
+            Country(name="Germany", iso_two_letter="DE"),
+            Country(name="Czech Republic", iso_two_letter="CZ")
+        ]
+
+    def test_simple(self):
+        Country.objects.bulk_create(self.data)
+        self.assertQuerysetEqual(Country.objects.order_by("-name"), [
+            "United States of America", "The Netherlands", "Germany", "Czech Republic"
+        ], attrgetter("name"))
+
+    @skipUnlessDBFeature("has_bulk_insert")
+    def test_efficiency(self):
+        with self.assertNumQueries(1):
+            Country.objects.bulk_create(self.data)
+
+    def test_inheritance(self):
+        Restaurant.objects.bulk_create([
+            Restaurant(name="Nicholas's")
+        ])
+        self.assertQuerysetEqual(Restaurant.objects.all(), [
+            "Nicholas's",
+        ], attrgetter("name"))
+        with self.assertRaises(ValueError):
+            Pizzeria.objects.bulk_create([
+                Pizzeria(name="The Art of Pizza")
+            ])
+        self.assertQuerysetEqual(Pizzeria.objects.all(), [])
+        self.assertQuerysetEqual(Restaurant.objects.all(), [
+            "Nicholas's",
+        ], attrgetter("name"))
+
+    def test_non_auto_increment_pk(self):
+        with self.assertNumQueries(1):
+            State.objects.bulk_create([
+                State(two_letter_code=s)
+                for s in ["IL", "NY", "CA", "ME"]
+            ])
+        self.assertQuerysetEqual(State.objects.order_by("two_letter_code"), [
+            "CA", "IL", "ME", "NY",
+        ], attrgetter("two_letter_code"))