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Deprecated transaction.commit/rollback_unless_managed. 

Since "unless managed" now means "if database-level autocommit",
committing or rolling back doesn't have any effect.

Restored transactional integrity in a few places that relied on
automatically-started transactions with a transitory API.
This commit is contained in:
Aymeric Augustin 2013-03-04 13:12:59 +01:00
parent 14aa563f51
commit ba5138b1c0
17 changed files with 116 additions and 208 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
django/contrib/gis/utils/layermapping.py
View File

@ -555,10 +555,6 @@ class LayerMapping(object):
except SystemExit:
raise
except Exception as msg:
if self.transaction_mode == 'autocommit':
# Rolling back the transaction so that other model saves
# will work.
transaction.rollback_unless_managed()
if strict:
# Bailing out if the `strict` keyword is set.
if not silent:

1
django/contrib/sessions/backends/db.py
View File

@ -74,7 +74,6 @@ class SessionStore(SessionBase):
@classmethod
def clear_expired(cls):
Session.objects.filter(expire_date__lt=timezone.now()).delete()
transaction.commit_unless_managed()
# At bottom to avoid circular import

7
django/core/cache/backends/db.py vendored
View File

@ -10,7 +10,7 @@ except ImportError:
from django.conf import settings
from django.core.cache.backends.base import BaseCache
from django.db import connections, router, transaction, DatabaseError
from django.db import connections, router, DatabaseError
from django.utils import timezone, six
from django.utils.encoding import force_bytes
@ -70,7 +70,6 @@ class DatabaseCache(BaseDatabaseCache):
cursor = connections[db].cursor()
cursor.execute("DELETE FROM %s "
"WHERE cache_key = %%s" % table, [key])
transaction.commit_unless_managed(using=db)
return default
value = connections[db].ops.process_clob(row[1])
return pickle.loads(base64.b64decode(force_bytes(value)))
@ -124,10 +123,8 @@ class DatabaseCache(BaseDatabaseCache):
[key, b64encoded, connections[db].ops.value_to_db_datetime(exp)])
except DatabaseError:
# To be threadsafe, updates/inserts are allowed to fail silently
transaction.rollback_unless_managed(using=db)
return False
else:
transaction.commit_unless_managed(using=db)
return True
def delete(self, key, version=None):
@ -139,7 +136,6 @@ class DatabaseCache(BaseDatabaseCache):
cursor = connections[db].cursor()
cursor.execute("DELETE FROM %s WHERE cache_key = %%s" % table, [key])
transaction.commit_unless_managed(using=db)
def has_key(self, key, version=None):
key = self.make_key(key, version=version)
@ -184,7 +180,6 @@ class DatabaseCache(BaseDatabaseCache):
table = connections[db].ops.quote_name(self._table)
cursor = connections[db].cursor()
cursor.execute('DELETE FROM %s' % table)
transaction.commit_unless_managed(using=db)
# For backwards compatibility
class CacheClass(DatabaseCache):

21
django/core/management/commands/createcachetable.py
View File

@ -53,14 +53,13 @@ class Command(LabelCommand):
for i, line in enumerate(table_output):
full_statement.append(' %s%s' % (line, i < len(table_output)-1 and ',' or ''))
full_statement.append(');')
curs = connection.cursor()
try:
curs.execute("\n".join(full_statement))
except DatabaseError as e:
transaction.rollback_unless_managed(using=db)
raise CommandError(
"Cache table '%s' could not be created.\nThe error was: %s." %
(tablename, force_text(e)))
for statement in index_output:
curs.execute(statement)
transaction.commit_unless_managed(using=db)
with transaction.commit_on_success_unless_managed():
curs = connection.cursor()
try:
curs.execute("\n".join(full_statement))
except DatabaseError as e:
raise CommandError(
"Cache table '%s' could not be created.\nThe error was: %s." %
(tablename, force_text(e)))
for statement in index_output:
curs.execute(statement)

9
django/core/management/commands/flush.py
View File

@ -57,18 +57,17 @@ Are you sure you want to do this?
if confirm == 'yes':
try:
cursor = connection.cursor()
for sql in sql_list:
cursor.execute(sql)
with transaction.commit_on_success_unless_managed():
cursor = connection.cursor()
for sql in sql_list:
cursor.execute(sql)
except Exception as e:
transaction.rollback_unless_managed(using=db)
raise CommandError("""Database %s couldn't be flushed. Possible reasons:
* The database isn't running or isn't configured correctly.
* At least one of the expected database tables doesn't exist.
* The SQL was invalid.
Hint: Look at the output of 'django-admin.py sqlflush'. That's the SQL this command wasn't able to run.
The full error: %s""" % (connection.settings_dict['NAME'], e))
transaction.commit_unless_managed(using=db)
# Emit the post sync signal. This allows individual
# applications to respond as if the database had been

1
django/core/management/commands/loaddata.py
View File

@ -73,7 +73,6 @@ class Command(BaseCommand):
# 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=self.using)
transaction.enter_transaction_management(using=self.using)
class SingleZipReader(zipfile.ZipFile):

77
django/core/management/commands/syncdb.py
View File

@ -83,26 +83,25 @@ class Command(NoArgsCommand):
# Create the tables for each model
if verbosity >= 1:
self.stdout.write("Creating tables ...\n")
for app_name, model_list in manifest.items():
for model in model_list:
# Create the model's database table, if it doesn't already exist.
if verbosity >= 3:
self.stdout.write("Processing %s.%s model\n" % (app_name, model._meta.object_name))
sql, references = connection.creation.sql_create_model(model, self.style, seen_models)
seen_models.add(model)
created_models.add(model)
for refto, refs in references.items():
pending_references.setdefault(refto, []).extend(refs)
if refto in seen_models:
sql.extend(connection.creation.sql_for_pending_references(refto, self.style, pending_references))
sql.extend(connection.creation.sql_for_pending_references(model, self.style, pending_references))
if verbosity >= 1 and sql:
self.stdout.write("Creating table %s\n" % model._meta.db_table)
for statement in sql:
cursor.execute(statement)
tables.append(connection.introspection.table_name_converter(model._meta.db_table))
transaction.commit_unless_managed(using=db)
with transaction.commit_on_success_unless_managed(using=db):
for app_name, model_list in manifest.items():
for model in model_list:
# Create the model's database table, if it doesn't already exist.
if verbosity >= 3:
self.stdout.write("Processing %s.%s model\n" % (app_name, model._meta.object_name))
sql, references = connection.creation.sql_create_model(model, self.style, seen_models)
seen_models.add(model)
created_models.add(model)
for refto, refs in references.items():
pending_references.setdefault(refto, []).extend(refs)
if refto in seen_models:
sql.extend(connection.creation.sql_for_pending_references(refto, self.style, pending_references))
sql.extend(connection.creation.sql_for_pending_references(model, self.style, pending_references))
if verbosity >= 1 and sql:
self.stdout.write("Creating table %s\n" % model._meta.db_table)
for statement in sql:
cursor.execute(statement)
tables.append(connection.introspection.table_name_converter(model._meta.db_table))
# Send the post_syncdb signal, so individual apps can do whatever they need
# to do at this point.
@ -122,17 +121,16 @@ class Command(NoArgsCommand):
if custom_sql:
if verbosity >= 2:
self.stdout.write("Installing custom SQL for %s.%s model\n" % (app_name, model._meta.object_name))
try:
for sql in custom_sql:
cursor.execute(sql)
except Exception as e:
self.stderr.write("Failed to install custom SQL for %s.%s model: %s\n" % \
(app_name, model._meta.object_name, e))
if show_traceback:
traceback.print_exc()
transaction.rollback_unless_managed(using=db)
else:
transaction.commit_unless_managed(using=db)
with transaction.commit_on_success_unless_managed(using=db):
try:
for sql in custom_sql:
cursor.execute(sql)
except Exception as e:
self.stderr.write("Failed to install custom SQL for %s.%s model: %s\n" % \
(app_name, model._meta.object_name, e))
if show_traceback:
traceback.print_exc()
raise
else:
if verbosity >= 3:
self.stdout.write("No custom SQL for %s.%s model\n" % (app_name, model._meta.object_name))
@ -147,15 +145,14 @@ class Command(NoArgsCommand):
if index_sql:
if verbosity >= 2:
self.stdout.write("Installing index for %s.%s model\n" % (app_name, model._meta.object_name))
try:
for sql in index_sql:
cursor.execute(sql)
except Exception as e:
self.stderr.write("Failed to install index for %s.%s model: %s\n" % \
(app_name, model._meta.object_name, e))
transaction.rollback_unless_managed(using=db)
else:
transaction.commit_unless_managed(using=db)
with transaction.commit_on_success_unless_managed(using=db):
try:
for sql in index_sql:
cursor.execute(sql)
except Exception as e:
self.stderr.write("Failed to install index for %s.%s model: %s\n" % \
(app_name, model._meta.object_name, e))
raise
# Load initial_data fixtures (unless that has been disabled)
if load_initial_data:

11
django/db/__init__.py
View File

@ -77,14 +77,3 @@ def close_old_connections(**kwargs):
conn.close_if_unusable_or_obsolete()
signals.request_started.connect(close_old_connections)
signals.request_finished.connect(close_old_connections)
# Register an event that rolls back the connections
# when a Django request has an exception.
def _rollback_on_exception(**kwargs):
from django.db import transaction
for conn in connections:
try:
transaction.rollback_unless_managed(using=conn)
except DatabaseError:
pass
signals.got_request_exception.connect(_rollback_on_exception)

21
django/db/backends/__init__.py
View File

@ -339,27 +339,6 @@ class BaseDatabaseWrapper(object):
return self.transaction_state[-1]
return settings.TRANSACTIONS_MANAGED
def commit_unless_managed(self):
"""
Commits changes if the system is not in managed transaction mode.
"""
self.validate_thread_sharing()
if not self.is_managed():
self.commit()
self.clean_savepoints()
else:
self.set_dirty()
def rollback_unless_managed(self):
"""
Rolls back changes if the system is not in managed transaction mode.
"""
self.validate_thread_sharing()
if not self.is_managed():
self.rollback()
else:
self.set_dirty()
##### Foreign key constraints checks handling #####
@contextmanager

2
django/db/backends/dummy/base.py
View File

@ -58,8 +58,6 @@ class DatabaseWrapper(BaseDatabaseWrapper):
_set_autocommit = complain
set_dirty = complain
set_clean = complain
commit_unless_managed = complain
rollback_unless_managed = ignore
def __init__(self, *args, **kwargs):
super(DatabaseWrapper, self).__init__(*args, **kwargs)

84
django/db/models/base.py
View File

@ -609,48 +609,48 @@ class Model(six.with_metaclass(ModelBase)):
if update_fields:
non_pks = [f for f in non_pks if f.name in update_fields or f.attname in update_fields]
# First, try an UPDATE. If that doesn't update anything, do an INSERT.
pk_val = self._get_pk_val(meta)
pk_set = pk_val is not None
record_exists = True
manager = cls._base_manager
if pk_set:
# Determine if we should do an update (pk already exists, forced update,
# no force_insert)
if ((force_update or update_fields) or (not force_insert and
manager.using(using).filter(pk=pk_val).exists())):
if force_update or non_pks:
values = [(f, None, (raw and getattr(self, f.attname) or f.pre_save(self, False))) for f in non_pks]
if values:
rows = manager.using(using).filter(pk=pk_val)._update(values)
if force_update and not rows:
raise DatabaseError("Forced update did not affect any rows.")
if update_fields and not rows:
raise DatabaseError("Save with update_fields did not affect any rows.")
else:
with transaction.commit_on_success_unless_managed(using=using):
# First, try an UPDATE. If that doesn't update anything, do an INSERT.
pk_val = self._get_pk_val(meta)
pk_set = pk_val is not None
record_exists = True
manager = cls._base_manager
if pk_set:
# Determine if we should do an update (pk already exists, forced update,
# no force_insert)
if ((force_update or update_fields) or (not force_insert and
manager.using(using).filter(pk=pk_val).exists())):
if force_update or non_pks:
values = [(f, None, (raw and getattr(self, f.attname) or f.pre_save(self, False))) for f in non_pks]
if values:
rows = manager.using(using).filter(pk=pk_val)._update(values)
if force_update and not rows:
raise DatabaseError("Forced update did not affect any rows.")
if update_fields and not rows:
raise DatabaseError("Save with update_fields did not affect any rows.")
else:
record_exists = False
if not pk_set or not record_exists:
if meta.order_with_respect_to:
# If this is a model with an order_with_respect_to
# autopopulate the _order field
field = meta.order_with_respect_to
order_value = manager.using(using).filter(**{field.name: getattr(self, field.attname)}).count()
self._order = order_value
fields = meta.local_fields
if not pk_set:
if force_update or update_fields:
raise ValueError("Cannot force an update in save() with no primary key.")
fields = [f for f in fields if not isinstance(f, AutoField)]
record_exists = False
if not pk_set or not record_exists:
if meta.order_with_respect_to:
# If this is a model with an order_with_respect_to
# autopopulate the _order field
field = meta.order_with_respect_to
order_value = manager.using(using).filter(**{field.name: getattr(self, field.attname)}).count()
self._order = order_value
fields = meta.local_fields
if not pk_set:
if force_update or update_fields:
raise ValueError("Cannot force an update in save() with no primary key.")
fields = [f for f in fields if not isinstance(f, AutoField)]
update_pk = bool(meta.has_auto_field and not pk_set)
result = manager._insert([self], fields=fields, return_id=update_pk, using=using, raw=raw)
record_exists = False
update_pk = bool(meta.has_auto_field and not pk_set)
result = manager._insert([self], fields=fields, return_id=update_pk, using=using, raw=raw)
if update_pk:
setattr(self, meta.pk.attname, result)
transaction.commit_unless_managed(using=using)
if update_pk:
setattr(self, meta.pk.attname, result)
# Store the database on which the object was saved
self._state.db = using
@ -963,9 +963,9 @@ def method_set_order(ordered_obj, self, id_list, using=None):
order_name = ordered_obj._meta.order_with_respect_to.name
# FIXME: It would be nice if there was an "update many" version of update
# for situations like this.
for i, j in enumerate(id_list):
ordered_obj.objects.filter(**{'pk': j, order_name: rel_val}).update(_order=i)
transaction.commit_unless_managed(using=using)
with transaction.commit_on_success_unless_managed(using=using):
for i, j in enumerate(id_list):
ordered_obj.objects.filter(**{'pk': j, order_name: rel_val}).update(_order=i)
def method_get_order(ordered_obj, self):

2
django/db/models/deletion.py
View File

@ -62,8 +62,6 @@ def force_managed(func):
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)

4
django/db/models/query.py
View File

@ -460,8 +460,6 @@ class QuerySet(object):
self._batched_insert(objs_without_pk, fields, batch_size)
if forced_managed:
transaction.commit(using=self.db)
else:
transaction.commit_unless_managed(using=self.db)
finally:
if forced_managed:
transaction.leave_transaction_management(using=self.db)
@ -590,8 +588,6 @@ class QuerySet(object):
rows = query.get_compiler(self.db).execute_sql(None)
if forced_managed:
transaction.commit(using=self.db)
else:
transaction.commit_unless_managed(using=self.db)
finally:
if forced_managed:
transaction.leave_transaction_management(using=self.db)

27
django/db/transaction.py
View File

@ -123,16 +123,12 @@ def managed(flag=True, using=None):
PendingDeprecationWarning, stacklevel=2)
def commit_unless_managed(using=None):
"""
Commits changes if the system is not in managed transaction mode.
"""
get_connection(using).commit_unless_managed()
warnings.warn("'commit_unless_managed' is now a no-op.",
PendingDeprecationWarning, stacklevel=2)
def rollback_unless_managed(using=None):
"""
Rolls back changes if the system is not in managed transaction mode.
"""
get_connection(using).rollback_unless_managed()
warnings.warn("'rollback_unless_managed' is now a no-op.",
PendingDeprecationWarning, stacklevel=2)
###############
# Public APIs #
@ -280,3 +276,18 @@ def commit_manually(using=None):
leave_transaction_management(using=using)
return _transaction_func(entering, exiting, using)
def commit_on_success_unless_managed(using=None):
"""
Transitory API to preserve backwards-compatibility while refactoring.
"""
if is_managed(using):
def entering(using):
pass
def exiting(exc_value, using):
set_dirty(using=using)
return _transaction_func(entering, exiting, using)
else:
return commit_on_success(using)

19
django/test/testcases.py
View File

@ -157,14 +157,6 @@ class DocTestRunner(doctest.DocTestRunner):
doctest.DocTestRunner.__init__(self, *args, **kwargs)
self.optionflags = doctest.ELLIPSIS
def report_unexpected_exception(self, out, test, example, exc_info):
doctest.DocTestRunner.report_unexpected_exception(self, out, test,
example, exc_info)
# Rollback, in case of database errors. Otherwise they'd have
# side effects on other tests.
for conn in connections:
transaction.rollback_unless_managed(using=conn)
class _AssertNumQueriesContext(CaptureQueriesContext):
def __init__(self, test_case, num, connection):
@ -490,14 +482,10 @@ class TransactionTestCase(SimpleTestCase):
conn.ops.sequence_reset_by_name_sql(no_style(),
conn.introspection.sequence_list())
if sql_list:
try:
with transaction.commit_on_success_unless_managed(using=db_name):
cursor = conn.cursor()
for sql in sql_list:
cursor.execute(sql)
except Exception:
transaction.rollback_unless_managed(using=db_name)
raise
transaction.commit_unless_managed(using=db_name)
def _fixture_setup(self):
for db_name in self._databases_names(include_mirrors=False):
@ -537,11 +525,6 @@ class TransactionTestCase(SimpleTestCase):
conn.close()
def _fixture_teardown(self):
# Roll back any pending transactions in order to avoid a deadlock
# during flush when TEST_MIRROR is used (#18984).
for conn in connections.all():
conn.rollback_unless_managed()
for db in self._databases_names(include_mirrors=False):
call_command('flush', verbosity=0, interactive=False, database=db,
skip_validation=True, reset_sequences=False)

2
docs/internals/deprecation.txt
View File

@ -352,6 +352,8 @@ these changes.
- ``django.db.close_connection()``
- ``django.db.backends.creation.BaseDatabaseCreation.set_autocommit()``
- ``django.db.transaction.managed()``
- ``django.db.transaction.commit_unless_managed()``
- ``django.db.transaction.rollback_unless_managed()``
2.0
---

32
tests/transactions_regress/tests.py
View File

@ -208,38 +208,6 @@ class TestNewConnection(TransactionTestCase):
connection.leave_transaction_management()
self.assertEqual(orig_dirty, connection._dirty)
# TODO: update this test to account for database-level autocommit.
@expectedFailure
def test_commit_unless_managed(self):
cursor = connection.cursor()
cursor.execute("INSERT into transactions_regress_mod (fld) values (2)")
connection.commit_unless_managed()
self.assertFalse(connection.is_dirty())
self.assertEqual(len(Mod.objects.all()), 1)
self.assertTrue(connection.is_dirty())
connection.commit_unless_managed()
self.assertFalse(connection.is_dirty())
# TODO: update this test to account for database-level autocommit.
@expectedFailure
def test_commit_unless_managed_in_managed(self):
cursor = connection.cursor()
connection.enter_transaction_management()
cursor.execute("INSERT into transactions_regress_mod (fld) values (2)")
connection.commit_unless_managed()
self.assertTrue(connection.is_dirty())
connection.rollback()
self.assertFalse(connection.is_dirty())
self.assertEqual(len(Mod.objects.all()), 0)
connection.commit()
connection.leave_transaction_management()
self.assertFalse(connection.is_dirty())
self.assertEqual(len(Mod.objects.all()), 0)
self.assertTrue(connection.is_dirty())
connection.commit_unless_managed()
self.assertFalse(connection.is_dirty())
self.assertEqual(len(Mod.objects.all()), 0)
@skipUnless(connection.vendor == 'postgresql',
"This test only valid for PostgreSQL")