mirror of https://github.com/django/django.git
118 lines
4.7 KiB
Python
118 lines
4.7 KiB
Python
import datetime
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from django.conf import settings
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from django.db import backend, connection, transaction, DEFAULT_DB_ALIAS
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from django.test import TestCase, TransactionTestCase, skipUnlessDBFeature
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from models import Book, Award, AwardNote, Person, Child, Toy, PlayedWith, PlayedWithNote
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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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class DeleteLockingTest(TransactionTestCase):
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def setUp(self):
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# Create a second connection to the default 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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@skipUnlessDBFeature('test_db_allows_multiple_connections')
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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.assertEqual(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.assertEqual(1, Book.objects.count())
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class DeleteCascadeTests(TestCase):
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def test_generic_relation_cascade(self):
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"""
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Test that Django cascades deletes through generic-related
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objects to their reverse relations.
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This might falsely succeed if the database cascades deletes
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itself immediately; the postgresql_psycopg2 backend does not
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give such a false success because ForeignKeys are created with
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DEFERRABLE INITIALLY DEFERRED, so its internal cascade is
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delayed until transaction commit.
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"""
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person = Person.objects.create(name='Nelson Mandela')
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award = Award.objects.create(name='Nobel', content_object=person)
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note = AwardNote.objects.create(note='a peace prize',
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award=award)
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self.assertEquals(AwardNote.objects.count(), 1)
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person.delete()
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self.assertEquals(Award.objects.count(), 0)
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# first two asserts are just sanity checks, this is the kicker:
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self.assertEquals(AwardNote.objects.count(), 0)
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def test_fk_to_m2m_through(self):
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"""
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Test that if a M2M relationship has an explicitly-specified
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through model, and some other model has an FK to that through
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model, deletion is cascaded from one of the participants in
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the M2M, to the through model, to its related model.
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Like the above test, this could in theory falsely succeed if
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the DB cascades deletes itself immediately.
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"""
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juan = Child.objects.create(name='Juan')
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paints = Toy.objects.create(name='Paints')
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played = PlayedWith.objects.create(child=juan, toy=paints,
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date=datetime.date.today())
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note = PlayedWithNote.objects.create(played=played,
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note='the next Jackson Pollock')
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self.assertEquals(PlayedWithNote.objects.count(), 1)
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paints.delete()
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self.assertEquals(PlayedWith.objects.count(), 0)
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# first two asserts just sanity checks, this is the kicker:
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self.assertEquals(PlayedWithNote.objects.count(), 0)
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class LargeDeleteTests(TestCase):
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def test_large_deletes(self):
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"Regression for #13309 -- if the number of objects > chunk size, deletion still occurs"
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for x in range(300):
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track = Book.objects.create(pagecount=x+100)
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Book.objects.all().delete()
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self.assertEquals(Book.objects.count(), 0)
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