mirror of
https://github.com/Hopiu/django-cachalot.git
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9938b54123
Conflicts: cachalot/cache.py cachalot/monkey_patch.py cachalot/tests/read.py cachalot/utils.py tox.ini
669 lines
27 KiB
Python
669 lines
27 KiB
Python
# coding: utf-8
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from __future__ import unicode_literals
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import datetime
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from django.contrib.auth.models import Group, Permission, User
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from django.core.cache import cache
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from django.db import connection, transaction
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from django.db.models import Count
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from django.db.transaction import TransactionManagementError
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from django.test import TransactionTestCase, skipUnlessDBFeature
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from ..utils import _get_table_cache_key
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from .models import Test, TestChild
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class ReadTestCase(TransactionTestCase):
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"""
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Tests if every SQL request that only reads data is cached.
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The only exception is for requests that don’t go through the ORM, using
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``QuerySet.extra`` with ``select`` or ``where`` arguments,
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``Model.objects.raw``, or ``cursor.execute``.
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"""
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def setUp(self):
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self.group = Group.objects.create(name='test_group')
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self.group__permissions = list(Permission.objects.all()[:3])
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self.group.permissions.add(*self.group__permissions)
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self.user = User.objects.create_user('user')
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self.user__permissions = list(Permission.objects.all()[3:6])
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self.user.groups.add(self.group)
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self.user.user_permissions.add(*self.user__permissions)
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self.admin = User.objects.create_superuser('admin', 'admin@test.me',
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'password')
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self.t1__permission = (Permission.objects.order_by('?')
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.select_related('content_type')[0])
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self.t1 = Test.objects.create(
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name='test1', owner=self.user,
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date='1789-07-14', datetime='1789-07-14T16:43:27',
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permission=self.t1__permission)
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self.t2 = Test.objects.create(
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name='test2', owner=self.admin, public=True,
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date='1944-06-06', datetime='1944-06-06T06:35:00')
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def test_empty(self):
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with self.assertNumQueries(0):
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data1 = list(Test.objects.none())
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with self.assertNumQueries(0):
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data2 = list(Test.objects.none())
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [])
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def test_exists(self):
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with self.assertNumQueries(1):
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n1 = Test.objects.exists()
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with self.assertNumQueries(0):
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n2 = Test.objects.exists()
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self.assertEqual(n2, n1)
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self.assertTrue(n2)
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def test_count(self):
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with self.assertNumQueries(1):
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n1 = Test.objects.count()
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with self.assertNumQueries(0):
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n2 = Test.objects.count()
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self.assertEqual(n2, n1)
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self.assertEqual(n2, 2)
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def test_get(self):
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with self.assertNumQueries(1):
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data1 = Test.objects.get(name='test1')
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with self.assertNumQueries(0):
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data2 = Test.objects.get(name='test1')
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self.assertEqual(data2, data1)
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self.assertEqual(data2, self.t1)
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def test_first(self):
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with self.assertNumQueries(1):
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self.assertEqual(Test.objects.filter(name='bad').first(), None)
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with self.assertNumQueries(0):
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self.assertEqual(Test.objects.filter(name='bad').first(), None)
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with self.assertNumQueries(1):
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data1 = Test.objects.first()
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with self.assertNumQueries(0):
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data2 = Test.objects.first()
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self.assertEqual(data2, data1)
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self.assertEqual(data2, self.t1)
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def test_last(self):
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with self.assertNumQueries(1):
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data1 = Test.objects.last()
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with self.assertNumQueries(0):
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data2 = Test.objects.last()
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self.assertEqual(data2, data1)
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self.assertEqual(data2, self.t2)
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def test_all(self):
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with self.assertNumQueries(1):
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data1 = list(Test.objects.all())
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with self.assertNumQueries(0):
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data2 = list(Test.objects.all())
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [self.t1, self.t2])
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def test_filter(self):
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with self.assertNumQueries(1):
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data1 = list(Test.objects.filter(public=True))
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with self.assertNumQueries(0):
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data2 = list(Test.objects.filter(public=True))
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [self.t2])
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with self.assertNumQueries(1):
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data1 = list(Test.objects.filter(name__in=['test2', 'test72']))
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with self.assertNumQueries(0):
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data2 = list(Test.objects.filter(name__in=['test2', 'test72']))
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [self.t2])
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with self.assertNumQueries(1):
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data1 = list(Test.objects.filter(
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date__gt=datetime.date(1900, 1, 1)))
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with self.assertNumQueries(0):
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data2 = list(Test.objects.filter(
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date__gt=datetime.date(1900, 1, 1)))
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [self.t2])
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with self.assertNumQueries(1):
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data1 = list(Test.objects.filter(
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datetime__lt=datetime.datetime(1900, 1, 1)))
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with self.assertNumQueries(0):
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data2 = list(Test.objects.filter(
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datetime__lt=datetime.datetime(1900, 1, 1)))
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [self.t1])
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def test_filter_empty(self):
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with self.assertNumQueries(1):
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data1 = list(Test.objects.filter(public=True,
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name='user'))
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with self.assertNumQueries(0):
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data2 = list(Test.objects.filter(public=True,
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name='user'))
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [])
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def test_exclude(self):
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with self.assertNumQueries(1):
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data1 = list(Test.objects.exclude(public=True))
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with self.assertNumQueries(0):
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data2 = list(Test.objects.exclude(public=True))
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [self.t1])
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with self.assertNumQueries(1):
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data1 = list(Test.objects.exclude(name__in=['test2', 'test72']))
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with self.assertNumQueries(0):
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data2 = list(Test.objects.exclude(name__in=['test2', 'test72']))
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [self.t1])
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def test_slicing(self):
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with self.assertNumQueries(1):
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data1 = list(Test.objects.all()[:1])
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with self.assertNumQueries(0):
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data2 = list(Test.objects.all()[:1])
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [self.t1])
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def test_order_by(self):
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with self.assertNumQueries(1):
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data1 = list(Test.objects.order_by('pk'))
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with self.assertNumQueries(0):
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data2 = list(Test.objects.order_by('pk'))
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [self.t1, self.t2])
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with self.assertNumQueries(1):
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data1 = list(Test.objects.order_by('-name'))
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with self.assertNumQueries(0):
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data2 = list(Test.objects.order_by('-name'))
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [self.t2, self.t1])
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def test_random_order_by(self):
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with self.assertNumQueries(1):
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list(Test.objects.order_by('?'))
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with self.assertNumQueries(1):
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list(Test.objects.order_by('?'))
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def test_random_order_by_subquery(self):
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with self.assertNumQueries(1):
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list(Test.objects.filter(pk__in=Test.objects.order_by('?')))
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with self.assertNumQueries(1):
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list(Test.objects.filter(pk__in=Test.objects.order_by('?')))
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def test_reverse(self):
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with self.assertNumQueries(1):
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data1 = list(Test.objects.reverse())
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with self.assertNumQueries(0):
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data2 = list(Test.objects.reverse())
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [self.t2, self.t1])
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def test_distinct(self):
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# We ensure that the query without distinct should return duplicate
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# objects, in order to have a real-world example.
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data1 = list(Test.objects.filter(
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owner__user_permissions__content_type__app_label='auth'))
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self.assertEqual(len(data1), 3)
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self.assertListEqual(data1, [self.t1] * 3)
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with self.assertNumQueries(1):
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data2 = list(Test.objects.filter(
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owner__user_permissions__content_type__app_label='auth'
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).distinct())
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with self.assertNumQueries(0):
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data3 = list(Test.objects.filter(
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owner__user_permissions__content_type__app_label='auth'
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).distinct())
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self.assertListEqual(data3, data2)
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self.assertEqual(len(data3), 1)
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self.assertListEqual(data3, [self.t1])
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def test_iterator(self):
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with self.assertNumQueries(1):
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data1 = list(Test.objects.iterator())
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with self.assertNumQueries(0):
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data2 = list(Test.objects.iterator())
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [self.t1, self.t2])
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def test_in_bulk(self):
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with self.assertNumQueries(1):
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data1 = Test.objects.in_bulk((5432, self.t2.pk, 9200))
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with self.assertNumQueries(0):
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data2 = Test.objects.in_bulk((5432, self.t2.pk, 9200))
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self.assertDictEqual(data2, data1)
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self.assertDictEqual(data2, {self.t2.pk: self.t2})
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def test_values(self):
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with self.assertNumQueries(1):
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data1 = list(Test.objects.values('name', 'public'))
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with self.assertNumQueries(0):
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data2 = list(Test.objects.values('name', 'public'))
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self.assertEqual(len(data1), 2)
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self.assertEqual(len(data2), 2)
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for row1, row2 in zip(data1, data2):
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self.assertDictEqual(row2, row1)
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self.assertDictEqual(data2[0], {'name': 'test1', 'public': False})
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self.assertDictEqual(data2[1], {'name': 'test2', 'public': True})
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def test_values_list(self):
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with self.assertNumQueries(1):
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data1 = list(Test.objects.values_list('name', flat=True))
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with self.assertNumQueries(0):
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data2 = list(Test.objects.values_list('name', flat=True))
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, ['test1', 'test2'])
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def test_earliest(self):
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with self.assertNumQueries(1):
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data1 = Test.objects.earliest('date')
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with self.assertNumQueries(0):
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data2 = Test.objects.earliest('date')
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self.assertEqual(data2, data1)
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self.assertEqual(data2, self.t1)
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def test_latest(self):
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with self.assertNumQueries(1):
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data1 = Test.objects.latest('date')
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with self.assertNumQueries(0):
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data2 = Test.objects.latest('date')
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self.assertEqual(data2, data1)
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self.assertEqual(data2, self.t2)
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def test_dates(self):
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with self.assertNumQueries(1):
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data1 = list(Test.objects.dates('date', 'year'))
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with self.assertNumQueries(0):
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data2 = list(Test.objects.dates('date', 'year'))
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [datetime.date(1789, 1, 1),
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datetime.date(1944, 1, 1)])
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def test_datetimes(self):
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with self.assertNumQueries(1):
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data1 = list(Test.objects.datetimes('datetime', 'hour'))
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with self.assertNumQueries(0):
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data2 = list(Test.objects.datetimes('datetime', 'hour'))
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [datetime.datetime(1789, 7, 14, 16),
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datetime.datetime(1944, 6, 6, 6)])
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def test_subquery(self):
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with self.assertNumQueries(1):
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data1 = list(Test.objects.filter(owner__in=User.objects.all()))
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with self.assertNumQueries(0):
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data2 = list(Test.objects.filter(owner__in=User.objects.all()))
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [self.t1, self.t2])
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with self.assertNumQueries(1):
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data3 = list(Test.objects.filter(
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owner__groups__permissions__in=Permission.objects.all()))
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with self.assertNumQueries(0):
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data4 = list(Test.objects.filter(
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owner__groups__permissions__in=Permission.objects.all()))
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self.assertListEqual(data4, data3)
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self.assertListEqual(data4, [self.t1, self.t1, self.t1])
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with self.assertNumQueries(1):
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data5 = list(
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Test.objects.filter(
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owner__groups__permissions__in=Permission.objects.all()
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).distinct())
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with self.assertNumQueries(0):
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data6 = list(
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Test.objects.filter(
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owner__groups__permissions__in=Permission.objects.all()
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).distinct())
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self.assertListEqual(data6, data5)
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self.assertListEqual(data6, [self.t1])
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with self.assertNumQueries(1):
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data7 = list(
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TestChild.objects.exclude(permissions__isnull=True))
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with self.assertNumQueries(0):
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data8 = list(
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TestChild.objects.exclude(permissions__isnull=True))
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self.assertListEqual(data7, data8)
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self.assertListEqual(data7, [])
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def test_aggregate(self):
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Test.objects.create(name='test3', owner=self.user)
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with self.assertNumQueries(1):
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n1 = User.objects.aggregate(n=Count('test'))['n']
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with self.assertNumQueries(0):
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n2 = User.objects.aggregate(n=Count('test'))['n']
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self.assertEqual(n2, n1)
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self.assertEqual(n2, 3)
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def test_annotate(self):
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Test.objects.create(name='test3', owner=self.user)
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with self.assertNumQueries(1):
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data1 = list(User.objects.annotate(n=Count('test')).order_by('pk')
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.values_list('n', flat=True))
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with self.assertNumQueries(0):
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data2 = list(User.objects.annotate(n=Count('test')).order_by('pk')
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.values_list('n', flat=True))
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self.assertListEqual(data2, data1)
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self.assertListEqual(data2, [2, 1])
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def test_only(self):
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with self.assertNumQueries(1):
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t1 = Test.objects.only('name').first()
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t1.name
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with self.assertNumQueries(0):
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t2 = Test.objects.only('name').first()
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t2.name
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with self.assertNumQueries(1):
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t1.public
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with self.assertNumQueries(0):
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t2.public
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self.assertEqual(t2, t1)
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self.assertEqual(t2.name, t1.name)
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self.assertEqual(t2.public, t1.public)
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def test_defer(self):
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with self.assertNumQueries(1):
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t1 = Test.objects.defer('name').first()
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t1.public
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with self.assertNumQueries(0):
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t2 = Test.objects.defer('name').first()
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t2.public
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with self.assertNumQueries(1):
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t1.name
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with self.assertNumQueries(0):
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t2.name
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self.assertEqual(t2, t1)
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self.assertEqual(t2.name, t1.name)
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self.assertEqual(t2.public, t1.public)
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||
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def test_select_related(self):
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# Simple select_related
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with self.assertNumQueries(1):
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t1 = Test.objects.select_related('owner').get(name='test1')
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self.assertEqual(t1.owner, self.user)
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with self.assertNumQueries(0):
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t2 = Test.objects.select_related('owner').get(name='test1')
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self.assertEqual(t2.owner, self.user)
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self.assertEqual(t2, t1)
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self.assertEqual(t2, self.t1)
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||
|
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# Select_related through a foreign key
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with self.assertNumQueries(1):
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t3 = Test.objects.select_related('permission__content_type')[0]
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self.assertEqual(t3.permission, self.t1.permission)
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self.assertEqual(t3.permission.content_type,
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self.t1__permission.content_type)
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with self.assertNumQueries(0):
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t4 = Test.objects.select_related('permission__content_type')[0]
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self.assertEqual(t4.permission, self.t1.permission)
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self.assertEqual(t4.permission.content_type,
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self.t1__permission.content_type)
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self.assertEqual(t4, t3)
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self.assertEqual(t4, self.t1)
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||
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def test_prefetch_related(self):
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||
# Simple prefetch_related
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||
with self.assertNumQueries(2):
|
||
data1 = list(User.objects.prefetch_related('user_permissions'))
|
||
with self.assertNumQueries(0):
|
||
permissions1 = [p for u in data1 for p in u.user_permissions.all()]
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with self.assertNumQueries(0):
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data2 = list(User.objects.prefetch_related('user_permissions'))
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permissions2 = [p for u in data2 for p in u.user_permissions.all()]
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self.assertListEqual(permissions2, permissions1)
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self.assertListEqual(permissions2, self.user__permissions)
|
||
|
||
# Prefetch_related through a foreign key where exactly
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||
# the same prefetch_related SQL request was executed before
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||
with self.assertNumQueries(1):
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data3 = list(Test.objects.select_related('owner')
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.prefetch_related('owner__user_permissions'))
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with self.assertNumQueries(0):
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permissions3 = [p for t in data3
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for p in t.owner.user_permissions.all()]
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||
with self.assertNumQueries(0):
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||
data4 = list(Test.objects.select_related('owner')
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||
.prefetch_related('owner__user_permissions'))
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permissions4 = [p for t in data4
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||
for p in t.owner.user_permissions.all()]
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||
self.assertListEqual(permissions4, permissions3)
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self.assertListEqual(permissions4, self.user__permissions)
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||
|
||
# Prefetch_related through a foreign key where exactly
|
||
# the same prefetch_related SQL request was not fetched before
|
||
with self.assertNumQueries(2):
|
||
data5 = list(Test.objects
|
||
.select_related('owner')
|
||
.prefetch_related('owner__user_permissions')[:1])
|
||
with self.assertNumQueries(0):
|
||
permissions5 = [p for t in data5
|
||
for p in t.owner.user_permissions.all()]
|
||
with self.assertNumQueries(0):
|
||
data6 = list(Test.objects.select_related('owner')
|
||
.prefetch_related('owner__user_permissions')[:1])
|
||
permissions6 = [p for t in data6
|
||
for p in t.owner.user_permissions.all()]
|
||
self.assertListEqual(permissions6, permissions5)
|
||
self.assertListEqual(permissions6, self.user__permissions)
|
||
|
||
# Prefetch_related through a many to many
|
||
with self.assertNumQueries(2):
|
||
data7 = list(Test.objects.select_related('owner')
|
||
.prefetch_related('owner__groups__permissions'))
|
||
with self.assertNumQueries(0):
|
||
permissions7 = [p for t in data7
|
||
for g in t.owner.groups.all()
|
||
for p in g.permissions.all()]
|
||
with self.assertNumQueries(0):
|
||
data8 = list(Test.objects.select_related('owner')
|
||
.prefetch_related('owner__groups__permissions'))
|
||
permissions8 = [p for t in data8
|
||
for g in t.owner.groups.all()
|
||
for p in g.permissions.all()]
|
||
self.assertListEqual(permissions8, permissions7)
|
||
self.assertListEqual(permissions8, self.group__permissions)
|
||
|
||
@skipUnlessDBFeature('has_select_for_update')
|
||
def test_select_for_update(self):
|
||
with self.assertRaises(TransactionManagementError):
|
||
list(Test.objects.select_for_update())
|
||
|
||
with self.assertNumQueries(1):
|
||
with transaction.atomic():
|
||
data1 = list(Test.objects.select_for_update())
|
||
self.assertListEqual(data1, [self.t1, self.t2])
|
||
self.assertListEqual([t.name for t in data1],
|
||
['test1', 'test2'])
|
||
|
||
with self.assertNumQueries(0):
|
||
with transaction.atomic():
|
||
data2 = list(Test.objects.select_for_update())
|
||
self.assertListEqual(data2, [self.t1, self.t2])
|
||
self.assertListEqual([t.name for t in data2],
|
||
['test1', 'test2'])
|
||
|
||
def test_having(self):
|
||
with self.assertNumQueries(1):
|
||
data1 = list(User.objects.annotate(n=Count('user_permissions'))
|
||
.filter(n__gte=1))
|
||
self.assertListEqual(data1, [self.user])
|
||
|
||
with self.assertNumQueries(0):
|
||
data2 = list(User.objects.annotate(n=Count('user_permissions'))
|
||
.filter(n__gte=1))
|
||
self.assertListEqual(data2, [self.user])
|
||
|
||
with self.assertNumQueries(1):
|
||
self.assertEqual(User.objects.annotate(n=Count('user_permissions'))
|
||
.filter(n__gte=1).count(), 1)
|
||
|
||
with self.assertNumQueries(0):
|
||
self.assertEqual(User.objects.annotate(n=Count('user_permissions'))
|
||
.filter(n__gte=1).count(), 1)
|
||
|
||
def test_extra_select(self):
|
||
username_length_sql = """
|
||
SELECT LENGTH(%(user_table)s.username)
|
||
FROM %(user_table)s
|
||
WHERE %(user_table)s.id = %(test_table)s.owner_id
|
||
""" % {'user_table': User._meta.db_table,
|
||
'test_table': Test._meta.db_table}
|
||
|
||
with self.assertNumQueries(1):
|
||
data1 = list(Test.objects.extra(
|
||
select={'username_length': username_length_sql}))
|
||
self.assertListEqual(data1, [self.t1, self.t2])
|
||
self.assertListEqual([o.username_length for o in data1], [4, 5])
|
||
with self.assertNumQueries(0):
|
||
data2 = list(Test.objects.extra(
|
||
select={'username_length': username_length_sql}))
|
||
self.assertListEqual(data2, [self.t1, self.t2])
|
||
self.assertListEqual([o.username_length for o in data2], [4, 5])
|
||
|
||
def test_extra_where(self):
|
||
sql_condition = ("owner_id IN "
|
||
"(SELECT id FROM auth_user WHERE username = 'admin')")
|
||
with self.assertNumQueries(1):
|
||
data1 = list(Test.objects.extra(where=[sql_condition]))
|
||
self.assertListEqual(data1, [self.t2])
|
||
with self.assertNumQueries(0):
|
||
data2 = list(Test.objects.extra(where=[sql_condition]))
|
||
self.assertListEqual(data2, [self.t2])
|
||
|
||
def test_extra_tables(self):
|
||
with self.assertNumQueries(1):
|
||
list(Test.objects.extra(tables=['auth_user']))
|
||
with self.assertNumQueries(0):
|
||
list(Test.objects.extra(tables=['auth_user']))
|
||
|
||
def test_extra_order_by(self):
|
||
with self.assertNumQueries(1):
|
||
data1 = list(Test.objects.extra(order_by=['-cachalot_test.name']))
|
||
self.assertListEqual(data1, [self.t2, self.t1])
|
||
with self.assertNumQueries(0):
|
||
data2 = list(Test.objects.extra(order_by=['-cachalot_test.name']))
|
||
self.assertListEqual(data2, [self.t2, self.t1])
|
||
|
||
def test_table_inheritance(self):
|
||
is_sqlite = connection.vendor == 'sqlite'
|
||
with self.assertNumQueries(3 if is_sqlite else 2):
|
||
t_child = TestChild.objects.create(name='test_child')
|
||
|
||
with self.assertNumQueries(1):
|
||
self.assertEqual(TestChild.objects.get(), t_child)
|
||
|
||
with self.assertNumQueries(0):
|
||
self.assertEqual(TestChild.objects.get(), t_child)
|
||
|
||
def test_raw(self):
|
||
"""
|
||
Tests if ``Model.objects.raw`` queries are not cached.
|
||
"""
|
||
|
||
sql = 'SELECT * FROM %s;' % Test._meta.db_table
|
||
|
||
with self.assertNumQueries(1):
|
||
data1 = list(Test.objects.raw(sql))
|
||
with self.assertNumQueries(1):
|
||
data2 = list(Test.objects.raw(sql))
|
||
self.assertListEqual(data2, data1)
|
||
self.assertListEqual(data2, [self.t1, self.t2])
|
||
|
||
def test_cursor_execute(self):
|
||
"""
|
||
Tests if queries executed from a DB cursor are not cached.
|
||
"""
|
||
|
||
attname_column_list = [f.get_attname_column()
|
||
for f in Test._meta.fields]
|
||
attnames = [t[0] for t in attname_column_list]
|
||
columns = [t[1] for t in attname_column_list]
|
||
sql = 'SELECT %s FROM %s;' % (', '.join(columns), Test._meta.db_table)
|
||
|
||
with self.assertNumQueries(1):
|
||
with connection.cursor() as cursor:
|
||
cursor.execute(sql)
|
||
data1 = list(cursor.fetchall())
|
||
with self.assertNumQueries(1):
|
||
with connection.cursor() as cursor:
|
||
cursor.execute(sql)
|
||
data2 = list(cursor.fetchall())
|
||
self.assertListEqual(data2, data1)
|
||
self.assertListEqual(data2, list(Test.objects.values_list(*attnames)))
|
||
|
||
def test_missing_table_cache_key(self):
|
||
with self.assertNumQueries(1):
|
||
list(Test.objects.all())
|
||
with self.assertNumQueries(0):
|
||
list(Test.objects.all())
|
||
|
||
table_cache_key = _get_table_cache_key(connection.alias,
|
||
Test._meta.db_table)
|
||
cache.delete(table_cache_key)
|
||
|
||
with self.assertNumQueries(1):
|
||
list(Test.objects.all())
|
||
|
||
def test_unicode_get(self):
|
||
with self.assertNumQueries(1):
|
||
with self.assertRaises(Test.DoesNotExist):
|
||
Test.objects.get(name='Clémentine')
|
||
with self.assertNumQueries(0):
|
||
with self.assertRaises(Test.DoesNotExist):
|
||
Test.objects.get(name='Clémentine')
|
||
|
||
def test_unicode_table_name(self):
|
||
"""
|
||
Tests if using unicode in table names does not break caching.
|
||
"""
|
||
table_name = 'Clémentine'
|
||
if connection.vendor == 'postgresql':
|
||
table_name = '"%s"' % table_name
|
||
with connection.cursor() as cursor:
|
||
cursor.execute('CREATE TABLE %s (taste VARCHAR(20));' % table_name)
|
||
with self.assertNumQueries(1):
|
||
list(Test.objects.extra(tables=['Clémentine']))
|
||
with self.assertNumQueries(0):
|
||
list(Test.objects.extra(tables=['Clémentine']))
|
||
with connection.cursor() as cursor:
|
||
cursor.execute('DROP TABLE %s;' % table_name)
|
||
|
||
def test_unknown_parameter_type(self):
|
||
"""
|
||
Tests if queries with an unknown parameter type are not cached.
|
||
|
||
We don’t cache parameters with an unknown type because we don’t know
|
||
how to hash them.
|
||
|
||
Here we use a binary field, as it uses special parameters
|
||
on PostgreSQL and SQLite (but not on MySQL).
|
||
A similar result would be obtained using a geographic field, but it’s
|
||
more complex to test, since geographic database backends have a few
|
||
side effects, such as changing the number of queries
|
||
of a bulk_create of n objects from 1 to n.
|
||
"""
|
||
|
||
is_mysql = connection.vendor == 'mysql'
|
||
|
||
with self.assertNumQueries(1):
|
||
list(Test.objects.filter(bin=None))
|
||
with self.assertNumQueries(0):
|
||
list(Test.objects.filter(bin=None))
|
||
|
||
with self.assertNumQueries(1):
|
||
list(Test.objects.filter(bin=b'abc'))
|
||
with self.assertNumQueries(0 if is_mysql else 1):
|
||
list(Test.objects.filter(bin=b'abc'))
|
||
|
||
with self.assertNumQueries(1):
|
||
list(Test.objects.filter(bin=b'def'))
|
||
with self.assertNumQueries(0 if is_mysql else 1):
|
||
list(Test.objects.filter(bin=b'def'))
|