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"""
Dummy database backend for Django.
Django uses this if the database ENGINE setting is empty (None or empty string).
Each of these API functions, except connection.close(), raises
ImproperlyConfigured.
"""
from django.core.exceptions import ImproperlyConfigured
from django.db.backends import *
from django.db.backends.creation import BaseDatabaseCreation
def complain(*args, **kwargs):
raise ImproperlyConfigured("settings.DATABASES is improperly configured. "
"Please supply the ENGINE value. Check "
"settings documentation for more details.")
def ignore(*args, **kwargs):
pass
class DatabaseError(Exception):
pass
class IntegrityError(DatabaseError):
pass
class DatabaseOperations(BaseDatabaseOperations):
quote_name = complain
class DatabaseClient(BaseDatabaseClient):
runshell = complain
class DatabaseCreation(BaseDatabaseCreation):
create_test_db = ignore
destroy_test_db = ignore
class DatabaseIntrospection(BaseDatabaseIntrospection):
get_table_list = complain
get_table_description = complain
get_relations = complain
get_indexes = complain
get_key_columns = complain
class DatabaseWrapper(BaseDatabaseWrapper):
operators = {}
# Override the base class implementations with null
# implementations. Anything that tries to actually
# do something raises complain; anything that tries
# to rollback or undo something raises ignore.
_cursor = complain
_commit = complain
_rollback = ignore
_close = ignore
_savepoint = ignore
_savepoint_commit = complain
_savepoint_rollback = ignore
_set_autocommit = complain
set_dirty = complain
set_clean = complain
def __init__(self, *args, **kwargs):
super(DatabaseWrapper, self).__init__(*args, **kwargs)
self.features = BaseDatabaseFeatures(self)
self.ops = DatabaseOperations(self)
self.client = DatabaseClient(self)
self.creation = DatabaseCreation(self)
self.introspection = DatabaseIntrospection(self)
self.validation = BaseDatabaseValidation(self)
def is_usable(self):
return True
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