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

docs/ref/models/querysets.txt

@@ -1158,6 +1158,29 @@ has a side effect on your data. For more, see `Safe methods`_ in the HTTP spec.
 
 .. _Safe methods: http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.1.1
 
+bulk_create
+~~~~~~~~~~~
+
+.. method:: bulk_create(objs)
+
+This method inserts the provided list of objects into the database in an
+efficient manner (generally only 1 query, no matter how many objects there
+are)::
+
+    >>> Entry.objects.bulk_create([
+    ...     Entry(headline="Django 1.0 Released"),
+    ...     Entry(headline="Django 1.1 Announced"),
+    ...     Entry(headline="Breaking: Django is awesome")
+    ... ])
+
+This has a number of caveats though:
+
+  * The model's ``save()`` method will not be called, and the ``pre_save`` and
+    ``post_save`` signals will not be sent.
+  * It does not work with child models in a multi-table inheritance scenario.
+  * If the model's primary key is an :class:`~django.db.models.AutoField` it
+    does not retrieve and set the primary key attribute, as ``save()`` does.
+
 count
 ~~~~~