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transaction.py
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transaction.py
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from django.contrib.auth.models import User
from django.db import transaction, connection, IntegrityError
from django.test import TransactionTestCase, skipUnlessDBFeature
from .models import Test
from .test_utils import TestUtilsMixin
class AtomicTestCase(TestUtilsMixin, TransactionTestCase):
def test_successful_read_atomic(self):
with self.assertNumQueries(2 if self.is_sqlite else 1):
with transaction.atomic():
data1 = list(Test.objects.all())
self.assertListEqual(data1, [])
with self.assertNumQueries(0):
data2 = list(Test.objects.all())
self.assertListEqual(data2, [])
def test_unsuccessful_read_atomic(self):
with self.assertNumQueries(2 if self.is_sqlite else 1):
try:
with transaction.atomic():
data1 = list(Test.objects.all())
raise ZeroDivisionError
except ZeroDivisionError:
pass
self.assertListEqual(data1, [])
with self.assertNumQueries(1):
data2 = list(Test.objects.all())
self.assertListEqual(data2, [])
def test_successful_write_atomic(self):
with self.assertNumQueries(1):
data1 = list(Test.objects.all())
self.assertListEqual(data1, [])
with self.assertNumQueries(2 if self.is_sqlite else 1):
with transaction.atomic():
t1 = Test.objects.create(name='test1')
with self.assertNumQueries(1):
data2 = list(Test.objects.all())
self.assertListEqual(data2, [t1])
with self.assertNumQueries(2 if self.is_sqlite else 1):
with transaction.atomic():
t2 = Test.objects.create(name='test2')
with self.assertNumQueries(1):
data3 = list(Test.objects.all())
self.assertListEqual(data3, [t1, t2])
with self.assertNumQueries(4 if self.is_sqlite else 3):
with transaction.atomic():
data4 = list(Test.objects.all())
t3 = Test.objects.create(name='test3')
t4 = Test.objects.create(name='test4')
data5 = list(Test.objects.all())
self.assertListEqual(data4, [t1, t2])
self.assertListEqual(data5, [t1, t2, t3, t4])
self.assertNotEqual(t4, t3)
def test_unsuccessful_write_atomic(self):
with self.assertNumQueries(1):
data1 = list(Test.objects.all())
self.assertListEqual(data1, [])
with self.assertNumQueries(2 if self.is_sqlite else 1):
try:
with transaction.atomic():
Test.objects.create(name='test')
raise ZeroDivisionError
except ZeroDivisionError:
pass
with self.assertNumQueries(0):
data2 = list(Test.objects.all())
self.assertListEqual(data2, [])
with self.assertNumQueries(1):
with self.assertRaises(Test.DoesNotExist):
Test.objects.get(name='test')
def test_cache_inside_atomic(self):
with self.assertNumQueries(2 if self.is_sqlite else 1):
with transaction.atomic():
data1 = list(Test.objects.all())
data2 = list(Test.objects.all())
self.assertListEqual(data2, data1)
self.assertListEqual(data2, [])
def test_invalidation_inside_atomic(self):
with self.assertNumQueries(4 if self.is_sqlite else 3):
with transaction.atomic():
data1 = list(Test.objects.all())
t = Test.objects.create(name='test')
data2 = list(Test.objects.all())
self.assertListEqual(data1, [])
self.assertListEqual(data2, [t])
def test_successful_nested_read_atomic(self):
with self.assertNumQueries(7 if self.is_sqlite else 6):
with transaction.atomic():
list(Test.objects.all())
with transaction.atomic():
list(User.objects.all())
with self.assertNumQueries(2):
with transaction.atomic():
list(User.objects.all())
with self.assertNumQueries(0):
list(User.objects.all())
with self.assertNumQueries(0):
list(Test.objects.all())
list(User.objects.all())
def test_unsuccessful_nested_read_atomic(self):
with self.assertNumQueries(6 if self.is_sqlite else 5):
with transaction.atomic():
try:
with transaction.atomic():
with self.assertNumQueries(1):
list(Test.objects.all())
raise ZeroDivisionError
except ZeroDivisionError:
pass
with self.assertNumQueries(1):
list(Test.objects.all())
def test_successful_nested_write_atomic(self):
with self.assertNumQueries(13 if self.is_sqlite else 12):
with transaction.atomic():
t1 = Test.objects.create(name='test1')
with transaction.atomic():
t2 = Test.objects.create(name='test2')
data1 = list(Test.objects.all())
self.assertListEqual(data1, [t1, t2])
with transaction.atomic():
t3 = Test.objects.create(name='test3')
with transaction.atomic():
data2 = list(Test.objects.all())
self.assertListEqual(data2, [t1, t2, t3])
t4 = Test.objects.create(name='test4')
data3 = list(Test.objects.all())
self.assertListEqual(data3, [t1, t2, t3, t4])
def test_unsuccessful_nested_write_atomic(self):
with self.assertNumQueries(16 if self.is_sqlite else 15):
with transaction.atomic():
t1 = Test.objects.create(name='test1')
try:
with transaction.atomic():
t2 = Test.objects.create(name='test2')
data1 = list(Test.objects.all())
self.assertListEqual(data1, [t1, t2])
raise ZeroDivisionError
except ZeroDivisionError:
pass
data2 = list(Test.objects.all())
self.assertListEqual(data2, [t1])
try:
with transaction.atomic():
t3 = Test.objects.create(name='test3')
with transaction.atomic():
data2 = list(Test.objects.all())
self.assertListEqual(data2, [t1, t3])
raise ZeroDivisionError
except ZeroDivisionError:
pass
with self.assertNumQueries(1):
data3 = list(Test.objects.all())
self.assertListEqual(data3, [t1])
@skipUnlessDBFeature('can_defer_constraint_checks')
def test_deferred_error(self):
"""
Checks that an error occurring during the end of a transaction
has no impact on future queries.
"""
with connection.cursor() as cursor:
cursor.execute(
'CREATE TABLE example ('
'id int UNIQUE DEFERRABLE INITIALLY DEFERRED);')
with self.assertRaises(IntegrityError):
with transaction.atomic():
with self.assertNumQueries(1):
list(Test.objects.all())
cursor.execute(
'INSERT INTO example VALUES (1), (1);'
'-- ' + Test._meta.db_table) # Should invalidate Test.
with self.assertNumQueries(1):
list(Test.objects.all())