+
−"""
+
−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, "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 DatabaseClient(BaseDatabaseClient):
+
−    runshell = complain
+
−    
+
−class DatabaseIntrospection(BaseDatabaseIntrospection):
+
−    get_table_list = complain
+
−    get_table_description = complain
+
−    get_relations = complain
+
−    get_indexes = complain
+
−    
+
−class DatabaseWrapper(object):    
+
−    operators = {}
+
−    cursor = complain
+
−    _commit = complain
+
−    _rollback = ignore
+
−
+
−    def __init__(self, *args, **kwargs):
+
−        super(DatabaseWrapper, self).__init__(*args, **kwargs)
+
−
+
−        self.features = BaseDatabaseFeatures()
+
−        self.ops = DatabaseOperations()
+
−        self.client = DatabaseClient()
+
−        self.creation = BaseDatabaseCreation(self)
+
−        self.introspection = DatabaseIntrospection(self)
+
−        self.validation = BaseDatabaseValidation()
+
−
+
−    def close(self):
+
−        pass