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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.

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@16739 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Alex Gaynor 2011-09-09 19:22:28 +00:00
parent e55bbf4c3c
commit 7deb25b8dd
22 changed files with 331 additions and 78 deletions
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30
docs/topics/db/optimization.txt
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@ -268,3 +268,33 @@ instead of::
entry.blog.id
Insert in bulk
==============
When creating objects, where possible, use the
:meth:`~django.db.models.query.QuerySet.bulk_create()` method to reduce the
number of SQL queries. For example::
Entry.objects.bulk_create([
Entry(headline="Python 3.0 Released"),
Entry(headline="Python 3.1 Planned")
])
Is preferable to::
Entry.objects.create(headline="Python 3.0 Released")
Entry.objects.create(headline="Python 3.1 Planned")
Note that there are a number of :meth:`caveats to this method
<django.db.models.query.QuerySet.bulk_create>`, make sure it is appropriate for
your use case. This also applies to :class:`ManyToManyFields
<django.db.models.ManyToManyField>`, doing::
my_band.members.add(me, my_friend)
Is preferable to::
my_band.members.add(me)
my_band.members.add(my_friend)
Where ``Bands`` and ``Artists`` have a many-to-many relationship.