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from django.test import TransactionTestCase
from django.db import connection, transaction, IntegrityError, DEFAULT_DB_ALIAS
from django.conf import settings
from models import Reporter
PGSQL = 'psycopg2' in settings.DATABASES[DEFAULT_DB_ALIAS]['ENGINE']
MYSQL = 'mysql' in settings.DATABASES[DEFAULT_DB_ALIAS]['ENGINE']
class TransactionTests(TransactionTestCase):
if not MYSQL:
def create_a_reporter_then_fail(self, first, last):
a = Reporter(first_name=first, last_name=last)
a.save()
raise Exception("I meant to do that")
def remove_a_reporter(self, first_name):
r = Reporter.objects.get(first_name="Alice")
r.delete()
def manually_managed(self):
r = Reporter(first_name="Dirk", last_name="Gently")
r.save()
transaction.commit()
def manually_managed_mistake(self):
r = Reporter(first_name="Edward", last_name="Woodward")
r.save()
# Oops, I forgot to commit/rollback!
def execute_bad_sql(self):
cursor = connection.cursor()
cursor.execute("INSERT INTO transactions_reporter (first_name, last_name) VALUES ('Douglas', 'Adams');")
transaction.set_dirty()
def test_autocommit(self):
"""
The default behavior is to autocommit after each save() action.
"""
self.assertRaises(Exception,
self.create_a_reporter_then_fail,
"Alice", "Smith"
)
# The object created before the exception still exists
self.assertEqual(Reporter.objects.count(), 1)
def test_autocommit_decorator(self):
"""
The autocommit decorator works exactly the same as the default behavior.
"""
autocomitted_create_then_fail = transaction.autocommit(
self.create_a_reporter_then_fail
)
self.assertRaises(Exception,
autocomitted_create_then_fail,
"Alice", "Smith"
)
# Again, the object created before the exception still exists
self.assertEqual(Reporter.objects.count(), 1)
def test_autocommit_decorator_with_using(self):
"""
The autocommit decorator also works with a using argument.
"""
autocomitted_create_then_fail = transaction.autocommit(using='default')(
self.create_a_reporter_then_fail
)
self.assertRaises(Exception,
autocomitted_create_then_fail,
"Alice", "Smith"
)
# Again, the object created before the exception still exists
self.assertEqual(Reporter.objects.count(), 1)
def test_commit_on_success(self):
"""
With the commit_on_success decorator, the transaction is only committed
if the function doesn't throw an exception.
"""
committed_on_success = transaction.commit_on_success(
self.create_a_reporter_then_fail)
self.assertRaises(Exception, committed_on_success, "Dirk", "Gently")
# This time the object never got saved
self.assertEqual(Reporter.objects.count(), 0)
def test_commit_on_success_with_using(self):
"""
The commit_on_success decorator also works with a using argument.
"""
using_committed_on_success = transaction.commit_on_success(using='default')(
self.create_a_reporter_then_fail
)
self.assertRaises(Exception,
using_committed_on_success,
"Dirk", "Gently"
)
# This time the object never got saved
self.assertEqual(Reporter.objects.count(), 0)
def test_commit_on_success_succeed(self):
"""
If there aren't any exceptions, the data will get saved.
"""
Reporter.objects.create(first_name="Alice", last_name="Smith")
remove_comitted_on_success = transaction.commit_on_success(
self.remove_a_reporter
)
remove_comitted_on_success("Alice")
self.assertEqual(list(Reporter.objects.all()), [])
def test_manually_managed(self):
"""
You can manually manage transactions if you really want to, but you
have to remember to commit/rollback.
"""
manually_managed = transaction.commit_manually(self.manually_managed)
manually_managed()
self.assertEqual(Reporter.objects.count(), 1)
def test_manually_managed_mistake(self):
"""
If you forget, you'll get bad errors.
"""
manually_managed_mistake = transaction.commit_manually(
self.manually_managed_mistake
)
self.assertRaises(transaction.TransactionManagementError,
manually_managed_mistake)
def test_manually_managed_with_using(self):
"""
The commit_manually function also works with a using argument.
"""
using_manually_managed_mistake = transaction.commit_manually(using='default')(
self.manually_managed_mistake
)
self.assertRaises(transaction.TransactionManagementError,
using_manually_managed_mistake
)
if PGSQL:
def test_bad_sql(self):
"""
Regression for #11900: If a function wrapped by commit_on_success
writes a transaction that can't be committed, that transaction should
be rolled back. The bug is only visible using the psycopg2 backend,
though the fix is generally a good idea.
"""
execute_bad_sql = transaction.commit_on_success(self.execute_bad_sql)
self.assertRaises(IntegrityError, execute_bad_sql)
transaction.rollback()
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