+
−"""
+
−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 BaseDatabaseFeatures, BaseDatabaseOperations
+
−
+
−def complain(*args, **kwargs):
+
−    raise ImproperlyConfigured, "You haven't set the DATABASE_ENGINE setting yet."
+
−
+
−def ignore(*args, **kwargs):
+
−    pass
+
−
+
−class DatabaseError(Exception):
+
−    pass
+
−
+
−class IntegrityError(DatabaseError):
+
−    pass
+
−
+
−class DatabaseOperations(BaseDatabaseOperations):
+
−    quote_name = complain
+
−
+
−class DatabaseWrapper(object):
+
−    features = BaseDatabaseFeatures()
+
−    ops = DatabaseOperations()
+
−    operators = {}
+
−    cursor = complain
+
−    _commit = complain
+
−    _rollback = ignore
+
−
+
−    def __init__(self, **kwargs):
+
−        pass
+
−
+
−    def close(self):
+
−        pass