Fixed #21207 -- Fixed test failure on Oracle: test_cursor_contextmanager

from django.db.backends.oracle.creation import DatabaseCreation

from django.db.backends.oracle.introspection import DatabaseIntrospection

from django.db.backends.oracle.schema import DatabaseSchemaEditor

from django.db.utils import InterfaceError

from django.utils import six, timezone

from django.utils.encoding import force_bytes, force_text

from django.utils.functional import cached_property

    requires_literal_defaults = True

    connection_persists_old_columns = True

    nulls_order_largest = True

    closed_cursor_error_class = InterfaceError

class DatabaseOperations(BaseDatabaseOperations):