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267 lines
10 KiB
Python
267 lines
10 KiB
Python
from __future__ import absolute_import
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from django.db import connection, connections, transaction, DEFAULT_DB_ALIAS, DatabaseError
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from django.db.transaction import commit_on_success, commit_manually, TransactionManagementError
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from django.test import TransactionTestCase, skipUnlessDBFeature
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from django.test.utils import override_settings
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from django.utils.unittest import skipIf, skipUnless
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from .models import Mod, M2mA, M2mB
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class TestTransactionClosing(TransactionTestCase):
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"""
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Tests to make sure that transactions are properly closed
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when they should be, and aren't left pending after operations
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have been performed in them. Refs #9964.
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"""
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def test_raw_committed_on_success(self):
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"""
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Make sure a transaction consisting of raw SQL execution gets
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committed by the commit_on_success decorator.
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"""
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@commit_on_success
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def raw_sql():
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"Write a record using raw sql under a commit_on_success decorator"
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cursor = connection.cursor()
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cursor.execute("INSERT into transactions_regress_mod (fld) values (18)")
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raw_sql()
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# Rollback so that if the decorator didn't commit, the record is unwritten
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transaction.rollback()
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self.assertEqual(Mod.objects.count(), 1)
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# Check that the record is in the DB
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obj = Mod.objects.all()[0]
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self.assertEqual(obj.fld, 18)
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def test_commit_manually_enforced(self):
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"""
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Make sure that under commit_manually, even "read-only" transaction require closure
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(commit or rollback), and a transaction left pending is treated as an error.
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"""
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@commit_manually
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def non_comitter():
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"Execute a managed transaction with read-only operations and fail to commit"
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Mod.objects.count()
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self.assertRaises(TransactionManagementError, non_comitter)
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def test_commit_manually_commit_ok(self):
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"""
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Test that under commit_manually, a committed transaction is accepted by the transaction
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management mechanisms
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"""
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@commit_manually
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def committer():
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"""
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Perform a database query, then commit the transaction
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"""
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Mod.objects.count()
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transaction.commit()
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try:
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committer()
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except TransactionManagementError:
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self.fail("Commit did not clear the transaction state")
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def test_commit_manually_rollback_ok(self):
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"""
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Test that under commit_manually, a rolled-back transaction is accepted by the transaction
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management mechanisms
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"""
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@commit_manually
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def roller_back():
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"""
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Perform a database query, then rollback the transaction
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"""
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Mod.objects.count()
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transaction.rollback()
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try:
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roller_back()
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except TransactionManagementError:
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self.fail("Rollback did not clear the transaction state")
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def test_commit_manually_enforced_after_commit(self):
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"""
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Test that under commit_manually, if a transaction is committed and an operation is
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performed later, we still require the new transaction to be closed
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"""
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@commit_manually
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def fake_committer():
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"Query, commit, then query again, leaving with a pending transaction"
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Mod.objects.count()
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transaction.commit()
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Mod.objects.count()
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self.assertRaises(TransactionManagementError, fake_committer)
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@skipUnlessDBFeature('supports_transactions')
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def test_reuse_cursor_reference(self):
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"""
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Make sure transaction closure is enforced even when the queries are performed
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through a single cursor reference retrieved in the beginning
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(this is to show why it is wrong to set the transaction dirty only when a cursor
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is fetched from the connection).
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"""
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@commit_on_success
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def reuse_cursor_ref():
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"""
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Fetch a cursor, perform an query, rollback to close the transaction,
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then write a record (in a new transaction) using the same cursor object
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(reference). All this under commit_on_success, so the second insert should
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be committed.
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"""
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cursor = connection.cursor()
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cursor.execute("INSERT into transactions_regress_mod (fld) values (2)")
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transaction.rollback()
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cursor.execute("INSERT into transactions_regress_mod (fld) values (2)")
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reuse_cursor_ref()
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# Rollback so that if the decorator didn't commit, the record is unwritten
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transaction.rollback()
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self.assertEqual(Mod.objects.count(), 1)
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obj = Mod.objects.all()[0]
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self.assertEqual(obj.fld, 2)
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def test_failing_query_transaction_closed(self):
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"""
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Make sure that under commit_on_success, a transaction is rolled back even if
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the first database-modifying operation fails.
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This is prompted by http://code.djangoproject.com/ticket/6669 (and based on sample
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code posted there to exemplify the problem): Before Django 1.3,
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transactions were only marked "dirty" by the save() function after it successfully
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wrote the object to the database.
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"""
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from django.contrib.auth.models import User
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@transaction.commit_on_success
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def create_system_user():
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"Create a user in a transaction"
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user = User.objects.create_user(username='system', password='iamr00t', email='root@SITENAME.com')
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# Redundant, just makes sure the user id was read back from DB
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Mod.objects.create(fld=user.pk)
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# Create a user
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create_system_user()
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with self.assertRaises(DatabaseError):
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# The second call to create_system_user should fail for violating
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# a unique constraint (it's trying to re-create the same user)
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create_system_user()
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# Try to read the database. If the last transaction was indeed closed,
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# this should cause no problems
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User.objects.all()[0]
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@override_settings(DEBUG=True)
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def test_failing_query_transaction_closed_debug(self):
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"""
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Regression for #6669. Same test as above, with DEBUG=True.
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"""
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self.test_failing_query_transaction_closed()
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@skipUnless(connection.vendor == 'postgresql',
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"This test only valid for PostgreSQL")
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class TestPostgresAutocommit(TransactionTestCase):
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"""
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Tests to make sure psycopg2's autocommit mode is restored after entering
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and leaving transaction management. Refs #16047.
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"""
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def setUp(self):
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from psycopg2.extensions import (ISOLATION_LEVEL_AUTOCOMMIT,
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ISOLATION_LEVEL_READ_COMMITTED)
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self._autocommit = ISOLATION_LEVEL_AUTOCOMMIT
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self._read_committed = ISOLATION_LEVEL_READ_COMMITTED
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# We want a clean backend with autocommit = True, so
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# first we need to do a bit of work to have that.
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self._old_backend = connections[DEFAULT_DB_ALIAS]
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settings = self._old_backend.settings_dict.copy()
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opts = settings['OPTIONS'].copy()
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opts['autocommit'] = True
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settings['OPTIONS'] = opts
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new_backend = self._old_backend.__class__(settings, DEFAULT_DB_ALIAS)
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connections[DEFAULT_DB_ALIAS] = new_backend
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def tearDown(self):
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connections[DEFAULT_DB_ALIAS] = self._old_backend
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def test_initial_autocommit_state(self):
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self.assertTrue(connection.features.uses_autocommit)
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self.assertEqual(connection.isolation_level, self._autocommit)
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def test_transaction_management(self):
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transaction.enter_transaction_management()
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transaction.managed(True)
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self.assertEqual(connection.isolation_level, self._read_committed)
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transaction.leave_transaction_management()
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self.assertEqual(connection.isolation_level, self._autocommit)
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def test_transaction_stacking(self):
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transaction.enter_transaction_management()
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transaction.managed(True)
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self.assertEqual(connection.isolation_level, self._read_committed)
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transaction.enter_transaction_management()
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self.assertEqual(connection.isolation_level, self._read_committed)
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transaction.leave_transaction_management()
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self.assertEqual(connection.isolation_level, self._read_committed)
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transaction.leave_transaction_management()
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self.assertEqual(connection.isolation_level, self._autocommit)
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class TestManyToManyAddTransaction(TransactionTestCase):
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def test_manyrelated_add_commit(self):
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"Test for https://code.djangoproject.com/ticket/16818"
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a = M2mA.objects.create()
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b = M2mB.objects.create(fld=10)
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a.others.add(b)
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# We're in a TransactionTestCase and have not changed transaction
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# behavior from default of "autocommit", so this rollback should not
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# actually do anything. If it does in fact undo our add, that's a bug
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# that the bulk insert was not auto-committed.
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transaction.rollback()
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self.assertEqual(a.others.count(), 1)
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class SavepointTest(TransactionTestCase):
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@skipUnlessDBFeature('uses_savepoints')
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def test_savepoint_commit(self):
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@commit_manually
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def work():
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mod = Mod.objects.create(fld=1)
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pk = mod.pk
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sid = transaction.savepoint()
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Mod.objects.filter(pk=pk).update(fld=10)
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transaction.savepoint_commit(sid)
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mod2 = Mod.objects.get(pk=pk)
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transaction.commit()
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self.assertEqual(mod2.fld, 10)
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work()
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@skipIf(connection.vendor == 'mysql' and \
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connection.features._mysql_storage_engine == 'MyISAM',
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"MyISAM MySQL storage engine doesn't support savepoints")
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@skipUnlessDBFeature('uses_savepoints')
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def test_savepoint_rollback(self):
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@commit_manually
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def work():
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mod = Mod.objects.create(fld=1)
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pk = mod.pk
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sid = transaction.savepoint()
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Mod.objects.filter(pk=pk).update(fld=20)
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transaction.savepoint_rollback(sid)
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mod2 = Mod.objects.get(pk=pk)
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transaction.commit()
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self.assertEqual(mod2.fld, 1)
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work()
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