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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
63 lines
2.4 KiB
Python
63 lines
2.4 KiB
Python
from django.conf import settings
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from django.db import models, backend, connection, transaction, DEFAULT_DB_ALIAS
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from django.db.models import sql, query
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from django.test import TransactionTestCase
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class Book(models.Model):
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pagecount = models.IntegerField()
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# Can't run this test under SQLite, because you can't
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# get two connections to an in-memory database.
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if settings.DATABASES[DEFAULT_DB_ALIAS]['ENGINE'] != 'django.db.backends.sqlite3':
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class DeleteLockingTest(TransactionTestCase):
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def setUp(self):
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# Create a second connection to the database
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conn_settings = settings.DATABASES[DEFAULT_DB_ALIAS]
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self.conn2 = backend.DatabaseWrapper({
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'HOST': conn_settings['HOST'],
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'NAME': conn_settings['NAME'],
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'OPTIONS': conn_settings['OPTIONS'],
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'PASSWORD': conn_settings['PASSWORD'],
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'PORT': conn_settings['PORT'],
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'USER': conn_settings['USER'],
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'TIME_ZONE': settings.TIME_ZONE,
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})
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# Put both DB connections into managed transaction mode
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transaction.enter_transaction_management()
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transaction.managed(True)
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self.conn2._enter_transaction_management(True)
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def tearDown(self):
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# Close down the second connection.
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transaction.leave_transaction_management()
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self.conn2.close()
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def test_concurrent_delete(self):
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"Deletes on concurrent transactions don't collide and lock the database. Regression for #9479"
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# Create some dummy data
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b1 = Book(id=1, pagecount=100)
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b2 = Book(id=2, pagecount=200)
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b3 = Book(id=3, pagecount=300)
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b1.save()
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b2.save()
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b3.save()
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transaction.commit()
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self.assertEquals(3, Book.objects.count())
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# Delete something using connection 2.
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cursor2 = self.conn2.cursor()
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cursor2.execute('DELETE from delete_regress_book WHERE id=1')
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self.conn2._commit();
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# Now perform a queryset delete that covers the object
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# deleted in connection 2. This causes an infinite loop
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# under MySQL InnoDB unless we keep track of already
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# deleted objects.
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Book.objects.filter(pagecount__lt=250).delete()
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transaction.commit()
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self.assertEquals(1, Book.objects.count())
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