62 lines
2.4 KiB
Python
62 lines
2.4 KiB
Python
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from django.conf import settings
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from django.db import models, backend, connection, transaction
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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.DATABASE_ENGINE != '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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self.conn2 = backend.DatabaseWrapper({
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'DATABASE_HOST': settings.DATABASE_HOST,
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'DATABASE_NAME': settings.DATABASE_NAME,
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'DATABASE_OPTIONS': settings.DATABASE_OPTIONS,
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'DATABASE_PASSWORD': settings.DATABASE_PASSWORD,
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'DATABASE_PORT': settings.DATABASE_PORT,
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'DATABASE_USER': settings.DATABASE_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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