def test_reuse_cursor_reference(self):
"""
Make sure transaction closure is enforced even when the queries are performed
through a single cursor reference retrieved in the beginning
(this is to show why it is wrong to set the transaction dirty only when a cursor
is fetched from the connection).
"""
@commit_on_success
def reuse_cursor_ref():
"""
Fetch a cursor, perform an query, rollback to close the transaction,
then write a record (in a new transaction) using the same cursor object
(reference). All this under commit_on_success, so the second insert should
be committed.
"""
cursor = connection.cursor()
cursor.execute("INSERT into transactions_regress_mod (id,fld) values (1,2)")
transaction.rollback()
cursor.execute("INSERT into transactions_regress_mod (id,fld) values (1,2)")
reuse_cursor_ref()
# Rollback so that if the decorator didn't commit, the record is unwritten
transaction.rollback()
try:
# Check that the record is in the DB
obj = Mod.objects.get(pk=1)
self.assertEqual(obj.fld, 2)
except Mod.DoesNotExist:
self.fail("After ending a transaction, cursor use no longer sets dirty")
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()
def reuse_cursor_ref():
"""
Fetch a cursor, perform an query, rollback to close the transaction,
then write a record (in a new transaction) using the same cursor object
(reference). All this under commit_on_success, so the second insert should
be committed.
"""
cursor = connection.cursor()
cursor.execute("INSERT into transactions_regress_mod (id,fld) values (1,2)")
transaction.rollback()
cursor.execute("INSERT into transactions_regress_mod (id,fld) values (1,2)")
def test_syncdb(self):
with transaction.commit_manually():
Book.objects.all().delete()
management.call_command(
'syncdb',
verbosity=0,
load_initial_data=False
)
self.assertQuerysetEqual(Book.objects.all(), [])
transaction.rollback()
def ticket_11101(self):
management.call_command(
'loaddata',
'thingy.json',
verbosity=0,
commit=False
)
self.assertEqual(Thingy.objects.count(), 1)
transaction.rollback()
self.assertEqual(Thingy.objects.count(), 0)
transaction.commit()
def test_manyrelated_add_commit(self):
"Test for https://code.djangoproject.com/ticket/16818"
a = M2mA.objects.create()
b = M2mB.objects.create(fld=10)
a.others.add(b)
# We're in a TransactionTestCase and have not changed transaction
# behavior from default of "autocommit", so this rollback should not
# actually do anything. If it does in fact undo our add, that's a bug
# that the bulk insert was not auto-committed.
transaction.rollback()
self.assertEqual(a.others.count(), 1)
def test_bad_sql(self):
"""
Regression for #11900: If a block 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.
"""
with self.assertRaises(IntegrityError):
with transaction.commit_on_success():
cursor = connection.cursor()
cursor.execute("INSERT INTO transactions_reporter (first_name, last_name) VALUES ('Douglas', 'Adams');")
transaction.set_dirty()
transaction.rollback()
def _fixture_teardown(self):
if not connections_support_transactions():
return super(TestCase, self)._fixture_teardown()
# If the test case has a multi_db=True flag, teardown all databases.
# Otherwise, just teardown default.
if getattr(self, 'multi_db', False):
databases = connections
else:
databases = [DEFAULT_DB_ALIAS]
restore_transaction_methods()
for db in databases:
transaction.rollback(using=db)
transaction.leave_transaction_management(using=db)
def test_flush(self):
# Test presence of fixture (flush called by TransactionTestCase)
self.assertQuerysetEqual(
Book.objects.all(), [
'Achieving self-awareness of Python programs'
],
lambda a: a.name
)
with transaction.commit_manually():
management.call_command(
'flush',
verbosity=0,
interactive=False,
commit=False,
load_initial_data=False
)
self.assertQuerysetEqual(Book.objects.all(), [])
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()
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_raw_committed_on_success(self):
"""
Make sure a transaction consisting of raw SQL execution gets
committed by the commit_on_success decorator.
"""
@commit_on_success
def raw_sql():
"Write a record using raw sql under a commit_on_success decorator"
cursor = connection.cursor()
cursor.execute("INSERT into transactions_regress_mod (id,fld) values (17,18)")
raw_sql()
# Rollback so that if the decorator didn't commit, the record is unwritten
transaction.rollback()
try:
# Check that the record is in the DB
obj = Mod.objects.get(pk=17)
self.assertEqual(obj.fld, 18)
except Mod.DoesNotExist:
self.fail("transaction with raw sql not committed")
def roller_back():
"""
Perform a database query, then rollback the transaction
"""
_ = Mod.objects.count()
transaction.rollback()
def process_exception(self, request, exception):
"""Rolls back the database and leaves transaction management"""
if transaction.is_dirty():
transaction.rollback()
transaction.leave_transaction_management()
def handle(self, *fixture_labels, **options):
using = options.get('database')
connection = connections[using]
if not len(fixture_labels):
raise CommandError(
"No database fixture specified. Please provide the path of at "
"least one fixture in the command line."
)
verbosity = int(options.get('verbosity'))
show_traceback = options.get('traceback')
# commit is a stealth option - it isn't really useful as
# a command line option, but it can be useful when invoking
# loaddata from within another script.
# If commit=True, loaddata will use its own transaction;
# if commit=False, the data load SQL will become part of
# the transaction in place when loaddata was invoked.
commit = options.get('commit', True)
# Keep a count of the installed objects and fixtures
fixture_count = 0
loaded_object_count = 0
fixture_object_count = 0
models = set()
humanize = lambda dirname: "'%s'" % dirname if dirname else 'absolute path'
# Get a cursor (even though we don't need one yet). This has
# the side effect of initializing the test database (if
# it isn't already initialized).
cursor = connection.cursor()
# Start transaction management. All fixtures are installed in a
# single transaction to ensure that all references are resolved.
if commit:
transaction.commit_unless_managed(using=using)
transaction.enter_transaction_management(using=using)
transaction.managed(True, using=using)
class SingleZipReader(zipfile.ZipFile):
def __init__(self, *args, **kwargs):
zipfile.ZipFile.__init__(self, *args, **kwargs)
if settings.DEBUG:
assert len(self.namelist()) == 1, "Zip-compressed fixtures must contain only one file."
def read(self):
return zipfile.ZipFile.read(self, self.namelist()[0])
compression_types = {
None: open,
'gz': gzip.GzipFile,
'zip': SingleZipReader
}
if has_bz2:
compression_types['bz2'] = bz2.BZ2File
app_module_paths = []
for app in get_apps():
if hasattr(app, '__path__'):
# It's a 'models/' subpackage
for path in app.__path__:
app_module_paths.append(path)
else:
# It's a models.py module
app_module_paths.append(app.__file__)
app_fixtures = [os.path.join(os.path.dirname(path), 'fixtures') for path in app_module_paths]
try:
with connection.constraint_checks_disabled():
for fixture_label in fixture_labels:
parts = fixture_label.split('.')
if len(parts) > 1 and parts[-1] in compression_types:
compression_formats = [parts[-1]]
parts = parts[:-1]
else:
compression_formats = compression_types.keys()
if len(parts) == 1:
fixture_name = parts[0]
formats = serializers.get_public_serializer_formats()
else:
fixture_name, format = '.'.join(parts[:-1]), parts[-1]
if format in serializers.get_public_serializer_formats():
formats = [format]
else:
formats = []
if formats:
if verbosity >= 2:
self.stdout.write("Loading '%s' fixtures..." % fixture_name)
else:
raise CommandError(
"Problem installing fixture '%s': %s is not a known serialization format." %
(fixture_name, format))
if os.path.isabs(fixture_name):
fixture_dirs = [fixture_name]
else:
fixture_dirs = app_fixtures + list(settings.FIXTURE_DIRS) + ['']
for fixture_dir in fixture_dirs:
if verbosity >= 2:
self.stdout.write("Checking %s for fixtures..." % humanize(fixture_dir))
label_found = False
for combo in product([using, None], formats, compression_formats):
database, format, compression_format = combo
file_name = '.'.join(
p for p in [
fixture_name, database, format, compression_format
]
if p
)
if verbosity >= 3:
self.stdout.write("Trying %s for %s fixture '%s'..." % \
(humanize(fixture_dir), file_name, fixture_name))
full_path = os.path.join(fixture_dir, file_name)
open_method = compression_types[compression_format]
try:
fixture = open_method(full_path, 'r')
except IOError:
if verbosity >= 2:
self.stdout.write("No %s fixture '%s' in %s." % \
(format, fixture_name, humanize(fixture_dir)))
else:
try:
if label_found:
raise CommandError("Multiple fixtures named '%s' in %s. Aborting." %
(fixture_name, humanize(fixture_dir)))
fixture_count += 1
objects_in_fixture = 0
loaded_objects_in_fixture = 0
if verbosity >= 2:
self.stdout.write("Installing %s fixture '%s' from %s." % \
(format, fixture_name, humanize(fixture_dir)))
objects = serializers.deserialize(format, fixture, using=using)
for obj in objects:
objects_in_fixture += 1
if router.allow_syncdb(using, obj.object.__class__):
loaded_objects_in_fixture += 1
models.add(obj.object.__class__)
try:
obj.save(using=using)
except (DatabaseError, IntegrityError) as e:
e.args = ("Could not load %(app_label)s.%(object_name)s(pk=%(pk)s): %(error_msg)s" % {
'app_label': obj.object._meta.app_label,
'object_name': obj.object._meta.object_name,
'pk': obj.object.pk,
'error_msg': force_text(e)
},)
raise
loaded_object_count += loaded_objects_in_fixture
fixture_object_count += objects_in_fixture
label_found = True
except Exception as e:
if not isinstance(e, CommandError):
e.args = ("Problem installing fixture '%s': %s" % (full_path, e),)
raise
finally:
fixture.close()
# If the fixture we loaded contains 0 objects, assume that an
# error was encountered during fixture loading.
if objects_in_fixture == 0:
raise CommandError(
"No fixture data found for '%s'. (File format may be invalid.)" %
(fixture_name))
# Since we disabled constraint checks, we must manually check for
# any invalid keys that might have been added
table_names = [model._meta.db_table for model in models]
try:
connection.check_constraints(table_names=table_names)
except Exception as e:
e.args = ("Problem installing fixtures: %s" % e,)
raise
except (SystemExit, KeyboardInterrupt):
raise
except Exception as e:
if commit:
transaction.rollback(using=using)
transaction.leave_transaction_management(using=using)
raise
# If we found even one object in a fixture, we need to reset the
# database sequences.
if loaded_object_count > 0:
sequence_sql = connection.ops.sequence_reset_sql(no_style(), models)
if sequence_sql:
if verbosity >= 2:
self.stdout.write("Resetting sequences\n")
for line in sequence_sql:
cursor.execute(line)
if commit:
transaction.commit(using=using)
transaction.leave_transaction_management(using=using)
if verbosity >= 1:
if fixture_object_count == loaded_object_count:
self.stdout.write("Installed %d object(s) from %d fixture(s)" % (
loaded_object_count, fixture_count))
else:
self.stdout.write("Installed %d object(s) (of %d) from %d fixture(s)" % (
loaded_object_count, fixture_object_count, fixture_count))
# Close the DB connection. This is required as a workaround for an
# edge case in MySQL: if the same connection is used to
# create tables, load data, and query, the query can return
# incorrect results. See Django #7572, MySQL #37735.
if commit:
connection.close()
