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92 lines
3.5 KiB
Python
92 lines
3.5 KiB
Python
import unittest
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from contextlib import contextmanager
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from django.core.exceptions import ImproperlyConfigured
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from django.db import connection
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from django.test import TestCase, override_settings
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@contextmanager
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def get_connection():
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new_connection = connection.copy()
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yield new_connection
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new_connection.close()
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@override_settings(DEBUG=True)
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@unittest.skipUnless(connection.vendor == 'mysql', 'MySQL tests')
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class IsolationLevelTests(TestCase):
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read_committed = 'read committed'
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repeatable_read = 'repeatable read'
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isolation_values = {
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level: level.upper()
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for level in (read_committed, repeatable_read)
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}
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@classmethod
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def setUpClass(cls):
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super().setUpClass()
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configured_isolation_level = connection.isolation_level or cls.isolation_values[cls.repeatable_read]
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cls.configured_isolation_level = configured_isolation_level.upper()
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cls.other_isolation_level = (
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cls.read_committed
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if configured_isolation_level != cls.isolation_values[cls.read_committed]
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else cls.repeatable_read
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)
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@staticmethod
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def get_isolation_level(connection):
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with connection.cursor() as cursor:
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cursor.execute("SHOW VARIABLES WHERE variable_name IN ('transaction_isolation', 'tx_isolation')")
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return cursor.fetchone()[1].replace('-', ' ')
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def test_auto_is_null_auto_config(self):
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query = 'set sql_auto_is_null = 0'
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connection.init_connection_state()
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last_query = connection.queries[-1]['sql'].lower()
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if connection.features.is_sql_auto_is_null_enabled:
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self.assertIn(query, last_query)
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else:
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self.assertNotIn(query, last_query)
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def test_connect_isolation_level(self):
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self.assertEqual(self.get_isolation_level(connection), self.configured_isolation_level)
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def test_setting_isolation_level(self):
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with get_connection() as new_connection:
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new_connection.settings_dict['OPTIONS']['isolation_level'] = self.other_isolation_level
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self.assertEqual(
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self.get_isolation_level(new_connection),
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self.isolation_values[self.other_isolation_level]
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)
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def test_uppercase_isolation_level(self):
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# Upper case values are also accepted in 'isolation_level'.
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with get_connection() as new_connection:
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new_connection.settings_dict['OPTIONS']['isolation_level'] = self.other_isolation_level.upper()
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self.assertEqual(
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self.get_isolation_level(new_connection),
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self.isolation_values[self.other_isolation_level]
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)
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def test_default_isolation_level(self):
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# If not specified in settings, the default is read committed.
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with get_connection() as new_connection:
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new_connection.settings_dict['OPTIONS'].pop('isolation_level', None)
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self.assertEqual(
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self.get_isolation_level(new_connection),
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self.isolation_values[self.read_committed]
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)
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def test_isolation_level_validation(self):
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new_connection = connection.copy()
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new_connection.settings_dict['OPTIONS']['isolation_level'] = 'xxx'
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msg = (
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"Invalid transaction isolation level 'xxx' specified.\n"
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"Use one of 'read committed', 'read uncommitted', "
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"'repeatable read', 'serializable', or None."
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)
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with self.assertRaisesMessage(ImproperlyConfigured, msg):
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new_connection.cursor()
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