Fixed #15293 -- Updated the dummy backend to support the APIs introduced by...

    get_relations = complain

    get_indexes = complain

class DatabaseWrapper(object):

class DatabaseWrapper(BaseDatabaseWrapper):

    operators = {}

    cursor = complain

    # 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.

    _commit = complain

    _rollback = ignore

    enter_transaction_management = complain

    leave_transaction_management = ignore

    set_dirty = complain

    set_clean = complain

    commit_unless_managed = complain

    rollback_unless_managed = ignore

    savepoint = ignore

    savepoint_commit = complain

    savepoint_rollback = ignore

    close = ignore

    cursor = complain

    def __init__(self, *args, **kwargs):

        super(DatabaseWrapper, self).__init__(*args, **kwargs)

    def __init__(self, settings_dict, alias, *args, **kwargs):

        self.features = BaseDatabaseFeatures(self)

        self.ops = DatabaseOperations()

        self.client = DatabaseClient(self)

        self.creation = BaseDatabaseCreation(self)

        self.introspection = DatabaseIntrospection(self)

        self.validation = BaseDatabaseValidation(self)

        self.settings_dict = settings_dict

        self.alias = alias

        self.transaction_state = []

        self.savepoint_state = 0

        self.dirty = None

    def close(self):

        pass