670 lines
27 KiB
Python
670 lines
27 KiB
Python
# -*- coding: utf-8 -*-
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# Unit and doctests for specific database backends.
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from __future__ import absolute_import, unicode_literals
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import datetime
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import threading
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from django.conf import settings
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from django.core.management.color import no_style
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from django.core.exceptions import ImproperlyConfigured
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from django.db import (backend, connection, connections, DEFAULT_DB_ALIAS,
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IntegrityError, transaction)
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from django.db.backends.signals import connection_created
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from django.db.backends.postgresql_psycopg2 import version as pg_version
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from django.db.utils import ConnectionHandler, DatabaseError, load_backend
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from django.test import (TestCase, skipUnlessDBFeature, skipIfDBFeature,
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TransactionTestCase)
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from django.test.utils import override_settings
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from django.utils import unittest
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from . import models
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class OracleChecks(unittest.TestCase):
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@unittest.skipUnless(connection.vendor == 'oracle',
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"No need to check Oracle cursor semantics")
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def test_dbms_session(self):
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# If the backend is Oracle, test that we can call a standard
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# stored procedure through our cursor wrapper.
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convert_unicode = backend.convert_unicode
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cursor = connection.cursor()
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cursor.callproc(convert_unicode('DBMS_SESSION.SET_IDENTIFIER'),
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[convert_unicode('_django_testing!'),])
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@unittest.skipUnless(connection.vendor == 'oracle',
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"No need to check Oracle cursor semantics")
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def test_cursor_var(self):
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# If the backend is Oracle, test that we can pass cursor variables
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# as query parameters.
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cursor = connection.cursor()
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var = cursor.var(backend.Database.STRING)
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cursor.execute("BEGIN %s := 'X'; END; ", [var])
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self.assertEqual(var.getvalue(), 'X')
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@unittest.skipUnless(connection.vendor == 'oracle',
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"No need to check Oracle cursor semantics")
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def test_long_string(self):
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# If the backend is Oracle, test that we can save a text longer
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# than 4000 chars and read it properly
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c = connection.cursor()
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c.execute('CREATE TABLE ltext ("TEXT" NCLOB)')
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long_str = ''.join([unicode(x) for x in xrange(4000)])
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c.execute('INSERT INTO ltext VALUES (%s)',[long_str])
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c.execute('SELECT text FROM ltext')
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row = c.fetchone()
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self.assertEqual(long_str, row[0].read())
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c.execute('DROP TABLE ltext')
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@unittest.skipUnless(connection.vendor == 'oracle',
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"No need to check Oracle connection semantics")
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def test_client_encoding(self):
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# If the backend is Oracle, test that the client encoding is set
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# correctly. This was broken under Cygwin prior to r14781.
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connection.cursor() # Ensure the connection is initialized.
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self.assertEqual(connection.connection.encoding, "UTF-8")
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self.assertEqual(connection.connection.nencoding, "UTF-8")
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class MySQLTests(TestCase):
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@unittest.skipUnless(connection.vendor == 'mysql',
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"Test valid only for MySQL")
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def test_autoincrement(self):
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"""
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Check that auto_increment fields are reset correctly by sql_flush().
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Before MySQL version 5.0.13 TRUNCATE did not do auto_increment reset.
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Refs #16961.
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"""
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statements = connection.ops.sql_flush(no_style(),
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tables=['test'],
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sequences=[{
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'table': 'test',
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'col': 'somecol',
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}])
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found_reset = False
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for sql in statements:
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found_reset = found_reset or 'ALTER TABLE' in sql
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if connection.mysql_version < (5,0,13):
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self.assertTrue(found_reset)
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else:
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self.assertFalse(found_reset)
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@unittest.skipUnless(connection.vendor == 'mysql',
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"Test valid only for MySQL")
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def test_server_version_connections(self):
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connection.close()
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connection.mysql_version
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self.assertTrue(connection.connection is None)
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class DateQuotingTest(TestCase):
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def test_django_date_trunc(self):
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"""
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Test the custom ``django_date_trunc method``, in particular against
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fields which clash with strings passed to it (e.g. 'year') - see
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#12818__.
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__: http://code.djangoproject.com/ticket/12818
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"""
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updated = datetime.datetime(2010, 2, 20)
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models.SchoolClass.objects.create(year=2009, last_updated=updated)
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years = models.SchoolClass.objects.dates('last_updated', 'year')
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self.assertEqual(list(years), [datetime.datetime(2010, 1, 1, 0, 0)])
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def test_django_extract(self):
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"""
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Test the custom ``django_extract method``, in particular against fields
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which clash with strings passed to it (e.g. 'day') - see #12818__.
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__: http://code.djangoproject.com/ticket/12818
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"""
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updated = datetime.datetime(2010, 2, 20)
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models.SchoolClass.objects.create(year=2009, last_updated=updated)
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classes = models.SchoolClass.objects.filter(last_updated__day=20)
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self.assertEqual(len(classes), 1)
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class LastExecutedQueryTest(TestCase):
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def setUp(self):
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# connection.queries will not be filled in without this
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settings.DEBUG = True
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def tearDown(self):
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settings.DEBUG = False
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# There are no tests for the sqlite backend because it does not
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# implement paramater escaping. See #14091.
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@unittest.skipUnless(connection.vendor in ('oracle', 'postgresql'),
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"These backends use the standard parameter escaping rules")
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def test_parameter_escaping(self):
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# check that both numbers and string are properly quoted
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list(models.Tag.objects.filter(name="special:\\\"':", object_id=12))
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sql = connection.queries[-1]['sql']
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self.assertTrue("= 'special:\\\"'':' " in sql)
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self.assertTrue("= 12 " in sql)
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@unittest.skipUnless(connection.vendor == 'mysql',
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"MySQL uses backslashes to escape parameters.")
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def test_parameter_escaping(self):
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list(models.Tag.objects.filter(name="special:\\\"':", object_id=12))
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sql = connection.queries[-1]['sql']
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# only this line is different from the test above
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self.assertTrue("= 'special:\\\\\\\"\\':' " in sql)
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self.assertTrue("= 12 " in sql)
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class ParameterHandlingTest(TestCase):
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def test_bad_parameter_count(self):
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"An executemany call with too many/not enough parameters will raise an exception (Refs #12612)"
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cursor = connection.cursor()
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query = ('INSERT INTO %s (%s, %s) VALUES (%%s, %%s)' % (
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connection.introspection.table_name_converter('backends_square'),
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connection.ops.quote_name('root'),
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connection.ops.quote_name('square')
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))
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self.assertRaises(Exception, cursor.executemany, query, [(1,2,3),])
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self.assertRaises(Exception, cursor.executemany, query, [(1,),])
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# Unfortunately, the following tests would be a good test to run on all
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# backends, but it breaks MySQL hard. Until #13711 is fixed, it can't be run
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# everywhere (although it would be an effective test of #13711).
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class LongNameTest(TestCase):
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"""Long primary keys and model names can result in a sequence name
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that exceeds the database limits, which will result in truncation
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on certain databases (e.g., Postgres). The backend needs to use
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the correct sequence name in last_insert_id and other places, so
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check it is. Refs #8901.
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"""
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@skipUnlessDBFeature('supports_long_model_names')
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def test_sequence_name_length_limits_create(self):
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"""Test creation of model with long name and long pk name doesn't error. Ref #8901"""
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models.VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ.objects.create()
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@skipUnlessDBFeature('supports_long_model_names')
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def test_sequence_name_length_limits_m2m(self):
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"""Test an m2m save of a model with a long name and a long m2m field name doesn't error as on Django >=1.2 this now uses object saves. Ref #8901"""
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obj = models.VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ.objects.create()
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rel_obj = models.Person.objects.create(first_name='Django', last_name='Reinhardt')
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obj.m2m_also_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz.add(rel_obj)
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@skipUnlessDBFeature('supports_long_model_names')
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def test_sequence_name_length_limits_flush(self):
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"""Test that sequence resetting as part of a flush with model with long name and long pk name doesn't error. Ref #8901"""
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# A full flush is expensive to the full test, so we dig into the
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# internals to generate the likely offending SQL and run it manually
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# Some convenience aliases
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VLM = models.VeryLongModelNameZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ
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VLM_m2m = VLM.m2m_also_quite_long_zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz.through
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tables = [
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VLM._meta.db_table,
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VLM_m2m._meta.db_table,
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]
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sequences = [
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{
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'column': VLM._meta.pk.column,
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'table': VLM._meta.db_table
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},
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]
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cursor = connection.cursor()
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for statement in connection.ops.sql_flush(no_style(), tables, sequences):
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cursor.execute(statement)
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class SequenceResetTest(TestCase):
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def test_generic_relation(self):
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"Sequence names are correct when resetting generic relations (Ref #13941)"
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# Create an object with a manually specified PK
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models.Post.objects.create(id=10, name='1st post', text='hello world')
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# Reset the sequences for the database
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cursor = connection.cursor()
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commands = connections[DEFAULT_DB_ALIAS].ops.sequence_reset_sql(no_style(), [models.Post])
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for sql in commands:
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cursor.execute(sql)
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# If we create a new object now, it should have a PK greater
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# than the PK we specified manually.
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obj = models.Post.objects.create(name='New post', text='goodbye world')
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self.assertTrue(obj.pk > 10)
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class PostgresVersionTest(TestCase):
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def assert_parses(self, version_string, version):
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self.assertEqual(pg_version._parse_version(version_string), version)
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def test_parsing(self):
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"""Test PostgreSQL version parsing from `SELECT version()` output"""
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self.assert_parses("PostgreSQL 8.3 beta4", 80300)
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self.assert_parses("PostgreSQL 8.3", 80300)
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self.assert_parses("EnterpriseDB 8.3", 80300)
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self.assert_parses("PostgreSQL 8.3.6", 80306)
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self.assert_parses("PostgreSQL 8.4beta1", 80400)
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self.assert_parses("PostgreSQL 8.3.1 on i386-apple-darwin9.2.2, compiled by GCC i686-apple-darwin9-gcc-4.0.1 (GCC) 4.0.1 (Apple Inc. build 5478)", 80301)
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def test_version_detection(self):
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"""Test PostgreSQL version detection"""
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# Helper mocks
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class CursorMock(object):
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"Very simple mock of DB-API cursor"
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def execute(self, arg):
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pass
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def fetchone(self):
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return ["PostgreSQL 8.3"]
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class OlderConnectionMock(object):
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"Mock of psycopg2 (< 2.0.12) connection"
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def cursor(self):
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return CursorMock()
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# psycopg2 < 2.0.12 code path
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conn = OlderConnectionMock()
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self.assertEqual(pg_version.get_version(conn), 80300)
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class PostgresNewConnectionTest(TestCase):
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"""
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#17062: PostgreSQL shouldn't roll back SET TIME ZONE, even if the first
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transaction is rolled back.
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"""
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@unittest.skipUnless(
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connection.vendor == 'postgresql' and connection.isolation_level > 0,
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"This test applies only to PostgreSQL without autocommit")
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def test_connect_and_rollback(self):
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new_connections = ConnectionHandler(settings.DATABASES)
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new_connection = new_connections[DEFAULT_DB_ALIAS]
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try:
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# Ensure the database default time zone is different than
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# the time zone in new_connection.settings_dict. We can
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# get the default time zone by reset & show.
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cursor = new_connection.cursor()
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cursor.execute("RESET TIMEZONE")
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cursor.execute("SHOW TIMEZONE")
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db_default_tz = cursor.fetchone()[0]
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new_tz = 'Europe/Paris' if db_default_tz == 'UTC' else 'UTC'
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new_connection.close()
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# Fetch a new connection with the new_tz as default
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# time zone, run a query and rollback.
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new_connection.settings_dict['TIME_ZONE'] = new_tz
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new_connection.enter_transaction_management()
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cursor = new_connection.cursor()
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new_connection.rollback()
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# Now let's see if the rollback rolled back the SET TIME ZONE.
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cursor.execute("SHOW TIMEZONE")
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tz = cursor.fetchone()[0]
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self.assertEqual(new_tz, tz)
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finally:
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try:
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new_connection.close()
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except DatabaseError:
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pass
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# Unfortunately with sqlite3 the in-memory test database cannot be
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# closed, and so it cannot be re-opened during testing, and so we
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# sadly disable this test for now.
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class ConnectionCreatedSignalTest(TestCase):
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@skipUnlessDBFeature('test_db_allows_multiple_connections')
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def test_signal(self):
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data = {}
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def receiver(sender, connection, **kwargs):
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data["connection"] = connection
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connection_created.connect(receiver)
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connection.close()
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cursor = connection.cursor()
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self.assertTrue(data["connection"].connection is connection.connection)
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connection_created.disconnect(receiver)
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data.clear()
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cursor = connection.cursor()
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self.assertTrue(data == {})
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class EscapingChecks(TestCase):
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@unittest.skipUnless(connection.vendor == 'sqlite',
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"This is a sqlite-specific issue")
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def test_parameter_escaping(self):
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#13648: '%s' escaping support for sqlite3
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cursor = connection.cursor()
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response = cursor.execute(
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"select strftime('%%s', date('now'))").fetchall()[0][0]
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self.assertNotEqual(response, None)
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# response should be an non-zero integer
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self.assertTrue(int(response))
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class BackendTestCase(TestCase):
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def create_squares_with_executemany(self, args):
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cursor = connection.cursor()
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opts = models.Square._meta
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tbl = connection.introspection.table_name_converter(opts.db_table)
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f1 = connection.ops.quote_name(opts.get_field('root').column)
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f2 = connection.ops.quote_name(opts.get_field('square').column)
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query = 'INSERT INTO %s (%s, %s) VALUES (%%s, %%s)' % (tbl, f1, f2)
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cursor.executemany(query, args)
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def test_cursor_executemany(self):
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#4896: Test cursor.executemany
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args = [(i, i**2) for i in range(-5, 6)]
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self.create_squares_with_executemany(args)
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self.assertEqual(models.Square.objects.count(), 11)
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for i in range(-5, 6):
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square = models.Square.objects.get(root=i)
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self.assertEqual(square.square, i**2)
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def test_cursor_executemany_with_empty_params_list(self):
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#4765: executemany with params=[] does nothing
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args = []
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self.create_squares_with_executemany(args)
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self.assertEqual(models.Square.objects.count(), 0)
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def test_cursor_executemany_with_iterator(self):
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#10320: executemany accepts iterators
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args = iter((i, i**2) for i in range(-3, 2))
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self.create_squares_with_executemany(args)
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self.assertEqual(models.Square.objects.count(), 5)
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args = iter((i, i**2) for i in range(3, 7))
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with override_settings(DEBUG=True):
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# same test for DebugCursorWrapper
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self.create_squares_with_executemany(args)
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self.assertEqual(models.Square.objects.count(), 9)
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def test_unicode_fetches(self):
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#6254: fetchone, fetchmany, fetchall return strings as unicode objects
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qn = connection.ops.quote_name
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models.Person(first_name="John", last_name="Doe").save()
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models.Person(first_name="Jane", last_name="Doe").save()
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models.Person(first_name="Mary", last_name="Agnelline").save()
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models.Person(first_name="Peter", last_name="Parker").save()
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models.Person(first_name="Clark", last_name="Kent").save()
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opts2 = models.Person._meta
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f3, f4 = opts2.get_field('first_name'), opts2.get_field('last_name')
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query2 = ('SELECT %s, %s FROM %s ORDER BY %s'
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% (qn(f3.column), qn(f4.column), connection.introspection.table_name_converter(opts2.db_table),
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qn(f3.column)))
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cursor = connection.cursor()
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cursor.execute(query2)
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self.assertEqual(cursor.fetchone(), ('Clark', 'Kent'))
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self.assertEqual(list(cursor.fetchmany(2)), [('Jane', 'Doe'), ('John', 'Doe')])
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self.assertEqual(list(cursor.fetchall()), [('Mary', 'Agnelline'), ('Peter', 'Parker')])
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def test_database_operations_helper_class(self):
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# Ticket #13630
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self.assertTrue(hasattr(connection, 'ops'))
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self.assertTrue(hasattr(connection.ops, 'connection'))
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self.assertEqual(connection, connection.ops.connection)
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def test_supports_needed_confirm(self):
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connection.features.confirm()
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self.assertIn(connection.features.supports_transactions, (True, False))
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self.assertIn(connection.features.supports_stddev, (True, False))
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self.assertIn(connection.features.can_introspect_foreign_keys, (True, False))
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def test_duplicate_table_error(self):
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""" Test that creating an existing table returns a DatabaseError """
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cursor = connection.cursor()
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query = 'CREATE TABLE %s (id INTEGER);' % models.Article._meta.db_table
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with self.assertRaises(DatabaseError):
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cursor.execute(query)
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# We don't make these tests conditional because that means we would need to
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# check and differentiate between:
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# * MySQL+InnoDB, MySQL+MYISAM (something we currently can't do).
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# * if sqlite3 (if/once we get #14204 fixed) has referential integrity turned
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# on or not, something that would be controlled by runtime support and user
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# preference.
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# verify if its type is django.database.db.IntegrityError.
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class FkConstraintsTests(TransactionTestCase):
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def setUp(self):
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# Create a Reporter.
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self.r = models.Reporter.objects.create(first_name='John', last_name='Smith')
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def test_integrity_checks_on_creation(self):
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"""
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Try to create a model instance that violates a FK constraint. If it
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fails it should fail with IntegrityError.
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"""
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a = models.Article(headline="This is a test", pub_date=datetime.datetime(2005, 7, 27), reporter_id=30)
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try:
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a.save()
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except IntegrityError:
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return
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self.skipTest("This backend does not support integrity checks.")
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def test_integrity_checks_on_update(self):
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"""
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Try to update a model instance introducing a FK constraint violation.
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If it fails it should fail with IntegrityError.
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"""
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# Create an Article.
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models.Article.objects.create(headline="Test article", pub_date=datetime.datetime(2010, 9, 4), reporter=self.r)
|
|
# Retrive it from the DB
|
|
a = models.Article.objects.get(headline="Test article")
|
|
a.reporter_id = 30
|
|
try:
|
|
a.save()
|
|
except IntegrityError:
|
|
return
|
|
self.skipTest("This backend does not support integrity checks.")
|
|
|
|
def test_disable_constraint_checks_manually(self):
|
|
"""
|
|
When constraint checks are disabled, should be able to write bad data without IntegrityErrors.
|
|
"""
|
|
with transaction.commit_manually():
|
|
# Create an Article.
|
|
models.Article.objects.create(headline="Test article", pub_date=datetime.datetime(2010, 9, 4), reporter=self.r)
|
|
# Retrive it from the DB
|
|
a = models.Article.objects.get(headline="Test article")
|
|
a.reporter_id = 30
|
|
try:
|
|
connection.disable_constraint_checking()
|
|
a.save()
|
|
connection.enable_constraint_checking()
|
|
except IntegrityError:
|
|
self.fail("IntegrityError should not have occurred.")
|
|
finally:
|
|
transaction.rollback()
|
|
|
|
def test_disable_constraint_checks_context_manager(self):
|
|
"""
|
|
When constraint checks are disabled (using context manager), should be able to write bad data without IntegrityErrors.
|
|
"""
|
|
with transaction.commit_manually():
|
|
# Create an Article.
|
|
models.Article.objects.create(headline="Test article", pub_date=datetime.datetime(2010, 9, 4), reporter=self.r)
|
|
# Retrive it from the DB
|
|
a = models.Article.objects.get(headline="Test article")
|
|
a.reporter_id = 30
|
|
try:
|
|
with connection.constraint_checks_disabled():
|
|
a.save()
|
|
except IntegrityError:
|
|
self.fail("IntegrityError should not have occurred.")
|
|
finally:
|
|
transaction.rollback()
|
|
|
|
def test_check_constraints(self):
|
|
"""
|
|
Constraint checks should raise an IntegrityError when bad data is in the DB.
|
|
"""
|
|
with transaction.commit_manually():
|
|
# Create an Article.
|
|
models.Article.objects.create(headline="Test article", pub_date=datetime.datetime(2010, 9, 4), reporter=self.r)
|
|
# Retrive it from the DB
|
|
a = models.Article.objects.get(headline="Test article")
|
|
a.reporter_id = 30
|
|
try:
|
|
with connection.constraint_checks_disabled():
|
|
a.save()
|
|
with self.assertRaises(IntegrityError):
|
|
connection.check_constraints()
|
|
finally:
|
|
transaction.rollback()
|
|
|
|
|
|
class ThreadTests(TestCase):
|
|
|
|
def test_default_connection_thread_local(self):
|
|
"""
|
|
Ensure that the default connection (i.e. django.db.connection) is
|
|
different for each thread.
|
|
Refs #17258.
|
|
"""
|
|
connections_set = set()
|
|
connection.cursor()
|
|
connections_set.add(connection.connection)
|
|
def runner():
|
|
from django.db import connection
|
|
connection.cursor()
|
|
connections_set.add(connection.connection)
|
|
for x in xrange(2):
|
|
t = threading.Thread(target=runner)
|
|
t.start()
|
|
t.join()
|
|
self.assertEqual(len(connections_set), 3)
|
|
# Finish by closing the connections opened by the other threads (the
|
|
# connection opened in the main thread will automatically be closed on
|
|
# teardown).
|
|
for conn in connections_set:
|
|
if conn != connection.connection:
|
|
conn.close()
|
|
|
|
def test_connections_thread_local(self):
|
|
"""
|
|
Ensure that the connections are different for each thread.
|
|
Refs #17258.
|
|
"""
|
|
connections_set = set()
|
|
for conn in connections.all():
|
|
connections_set.add(conn)
|
|
def runner():
|
|
from django.db import connections
|
|
for conn in connections.all():
|
|
# Allow thread sharing so the connection can be closed by the
|
|
# main thread.
|
|
conn.allow_thread_sharing = True
|
|
connections_set.add(conn)
|
|
for x in xrange(2):
|
|
t = threading.Thread(target=runner)
|
|
t.start()
|
|
t.join()
|
|
self.assertEqual(len(connections_set), 6)
|
|
# Finish by closing the connections opened by the other threads (the
|
|
# connection opened in the main thread will automatically be closed on
|
|
# teardown).
|
|
for conn in connections_set:
|
|
if conn != connection:
|
|
conn.close()
|
|
|
|
def test_pass_connection_between_threads(self):
|
|
"""
|
|
Ensure that a connection can be passed from one thread to the other.
|
|
Refs #17258.
|
|
"""
|
|
models.Person.objects.create(first_name="John", last_name="Doe")
|
|
|
|
def do_thread():
|
|
def runner(main_thread_connection):
|
|
from django.db import connections
|
|
connections['default'] = main_thread_connection
|
|
try:
|
|
models.Person.objects.get(first_name="John", last_name="Doe")
|
|
except DatabaseError as e:
|
|
exceptions.append(e)
|
|
t = threading.Thread(target=runner, args=[connections['default']])
|
|
t.start()
|
|
t.join()
|
|
|
|
# Without touching allow_thread_sharing, which should be False by default.
|
|
exceptions = []
|
|
do_thread()
|
|
# Forbidden!
|
|
self.assertTrue(isinstance(exceptions[0], DatabaseError))
|
|
|
|
# If explicitly setting allow_thread_sharing to False
|
|
connections['default'].allow_thread_sharing = False
|
|
exceptions = []
|
|
do_thread()
|
|
# Forbidden!
|
|
self.assertTrue(isinstance(exceptions[0], DatabaseError))
|
|
|
|
# If explicitly setting allow_thread_sharing to True
|
|
connections['default'].allow_thread_sharing = True
|
|
exceptions = []
|
|
do_thread()
|
|
# All good
|
|
self.assertEqual(len(exceptions), 0)
|
|
|
|
def test_closing_non_shared_connections(self):
|
|
"""
|
|
Ensure that a connection that is not explicitly shareable cannot be
|
|
closed by another thread.
|
|
Refs #17258.
|
|
"""
|
|
# First, without explicitly enabling the connection for sharing.
|
|
exceptions = set()
|
|
def runner1():
|
|
def runner2(other_thread_connection):
|
|
try:
|
|
other_thread_connection.close()
|
|
except DatabaseError as e:
|
|
exceptions.add(e)
|
|
t2 = threading.Thread(target=runner2, args=[connections['default']])
|
|
t2.start()
|
|
t2.join()
|
|
t1 = threading.Thread(target=runner1)
|
|
t1.start()
|
|
t1.join()
|
|
# The exception was raised
|
|
self.assertEqual(len(exceptions), 1)
|
|
|
|
# Then, with explicitly enabling the connection for sharing.
|
|
exceptions = set()
|
|
def runner1():
|
|
def runner2(other_thread_connection):
|
|
try:
|
|
other_thread_connection.close()
|
|
except DatabaseError as e:
|
|
exceptions.add(e)
|
|
# Enable thread sharing
|
|
connections['default'].allow_thread_sharing = True
|
|
t2 = threading.Thread(target=runner2, args=[connections['default']])
|
|
t2.start()
|
|
t2.join()
|
|
t1 = threading.Thread(target=runner1)
|
|
t1.start()
|
|
t1.join()
|
|
# No exception was raised
|
|
self.assertEqual(len(exceptions), 0)
|
|
|
|
|
|
class BackendLoadingTests(TestCase):
|
|
def test_old_style_backends_raise_useful_exception(self):
|
|
self.assertRaisesRegexp(ImproperlyConfigured,
|
|
"Try using django.db.backends.sqlite3 instead",
|
|
load_backend, 'sqlite3')
|
|
|
|
|
|
class MySQLPKZeroTests(TestCase):
|
|
"""
|
|
Zero as id for AutoField should raise exception in MySQL, because MySQL
|
|
does not allow zero for automatic primary key.
|
|
"""
|
|
|
|
@skipIfDBFeature('allows_primary_key_0')
|
|
def test_zero_as_autoval(self):
|
|
with self.assertRaises(ValueError):
|
|
models.Square.objects.create(id=0, root=0, square=1)
|