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