def test_transaction_management(self):
transaction.enter_transaction_management()
transaction.managed(True)
self.assertEqual(connection.isolation_level, self._read_committed)
transaction.leave_transaction_management()
self.assertEqual(connection.isolation_level, self._autocommit)
def _fixture_setup(self):
if not connections_support_transactions():
return super(TestCase, self)._fixture_setup()
assert not self.reset_sequences, 'reset_sequences cannot be used on TestCase instances'
# If the test case has a multi_db=True flag, setup all databases.
# Otherwise, just use default.
db_names = connections if getattr(self, 'multi_db', False) else [DEFAULT_DB_ALIAS]
for db_name in db_names:
transaction.enter_transaction_management(using=db_name)
transaction.managed(True, using=db_name)
disable_transaction_methods()
from djangocg.contrib.sites.models import Site
Site.objects.clear_cache()
for db in db_names:
if hasattr(self, 'fixtures'):
call_command('loaddata', *self.fixtures,
**{
'verbosity': 0,
'commit': False,
'database': db,
'skip_validation': True,
})
def run_select_for_update(self, status, nowait=False):
"""
Utility method that runs a SELECT FOR UPDATE against all
Person instances. After the select_for_update, it attempts
to update the name of the only record, save, and commit.
This function expects to run in a separate thread.
"""
status.append('started')
try:
# We need to enter transaction management again, as this is done on
# per-thread basis
transaction.enter_transaction_management(True)
transaction.managed(True)
people = list(
Person.objects.all().select_for_update(nowait=nowait)
)
people[0].name = 'Fred'
people[0].save()
transaction.commit()
except DatabaseError as e:
status.append(e)
finally:
# This method is run in a separate thread. It uses its own
# database connection. Close it without waiting for the GC.
connection.close()
def decorated(self, *args, **kwargs):
if not transaction.is_managed(using=self.using):
transaction.enter_transaction_management(using=self.using)
forced_managed = True
else:
forced_managed = False
try:
func(self, *args, **kwargs)
if forced_managed:
transaction.commit(using=self.using)
else:
transaction.commit_unless_managed(using=self.using)
finally:
if forced_managed:
transaction.leave_transaction_management(using=self.using)
def setUp(self):
# Create a second connection to the default database
conn_settings = settings.DATABASES[DEFAULT_DB_ALIAS]
self.conn2 = backend.DatabaseWrapper({
'HOST': conn_settings['HOST'],
'NAME': conn_settings['NAME'],
'OPTIONS': conn_settings['OPTIONS'],
'PASSWORD': conn_settings['PASSWORD'],
'PORT': conn_settings['PORT'],
'USER': conn_settings['USER'],
'TIME_ZONE': settings.TIME_ZONE,
})
# Put both DB connections into managed transaction mode
transaction.enter_transaction_management()
transaction.managed(True)
self.conn2._enter_transaction_management(True)
def setUp(self):
transaction.enter_transaction_management(True)
transaction.managed(True)
self.person = Person.objects.create(name='Reinhardt')
# We have to commit here so that code in run_select_for_update can
# see this data.
transaction.commit()
# We need another database connection to test that one connection
# issuing a SELECT ... FOR UPDATE will block.
new_connections = ConnectionHandler(settings.DATABASES)
self.new_connection = new_connections[DEFAULT_DB_ALIAS]
self.new_connection.enter_transaction_management()
self.new_connection.managed(True)
# We need to set settings.DEBUG to True so we can capture
# the output SQL to examine.
self._old_debug = settings.DEBUG
settings.DEBUG = True
def test_forward_refs(self):
"""
Tests that objects ids can be referenced before they are
defined in the serialization data.
"""
# The deserialization process needs to be contained
# within a transaction in order to test forward reference
# handling.
transaction.enter_transaction_management()
transaction.managed(True)
objs = serializers.deserialize(self.serializer_name, self.fwd_ref_str)
with connection.constraint_checks_disabled():
for obj in objs:
obj.save()
transaction.commit()
transaction.leave_transaction_management()
for model_cls in (Category, Author, Article):
self.assertEqual(model_cls.objects.all().count(), 1)
art_obj = Article.objects.all()[0]
self.assertEqual(art_obj.categories.all().count(), 1)
self.assertEqual(art_obj.author.name, "Agnes")
def process_request(self, request):
"""Enters transaction management"""
transaction.enter_transaction_management()
transaction.managed(True)
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()