为什么manage.py syncdb无法连接到google cloud sql数据库？

在最近更新Google App Engine上的应用时,我正在使用以下方法更新数据库:

SETTINGS_MODE='prod' ./manage.py syncdb

这是我上次运行时的工作,但现在我收到以下错误:

Traceback (most recent call last):
  File "./manage.py", line 10, in 
    execute_from_command_line(sys.argv)
  File "/Library/Python/2.7/site-packages/django/core/management/__init__.py", line 399, in execute_from_command_line
    utility.execute()
  File "/Library/Python/2.7/site-packages/django/core/management/__init__.py", line 392, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Library/Python/2.7/site-packages/django/core/management/base.py", line 242, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/Library/Python/2.7/site-packages/django/core/management/base.py", line 285, in execute
    output = self.handle(*args, **options)
  File "/Library/Python/2.7/site-packages/django/core/management/base.py", line 415, in handle
    return self.handle_noargs(**options)
  File "/c/clients/green_rentals/code/green-rental/south/management/commands/syncdb.py", line 92, in handle_noargs
    syncdb.Command().execute(**options)
  File "/Library/Python/2.7/site-packages/django/core/management/base.py", line 285, in execute
    output = self.handle(*args, **options)
  File "/Library/Python/2.7/site-packages/django/core/management/base.py", line 415, in handle
    return self.handle_noargs(**options)
  File "/Library/Python/2.7/site-packages/django/core/management/commands/syncdb.py", line 57, in handle_noargs
    cursor = connection.cursor()
  File "/Library/Python/2.7/site-packages/django/db/backends/__init__.py", line 159, in cursor
    cursor = util.CursorWrapper(self._cursor(), self)
  File "/c/downloads/python/google_appengine/google/storage/speckle/python/django/backend/base.py", line 263, in _cursor
    if not self._valid_connection():
  File "/c/downloads/python/google_appengine/google/storage/speckle/python/django/backend/base.py", line 258, in _valid_connection
    return super(DatabaseWrapper, self)._valid_connection()
AttributeError: 'super' object has no attribute '_valid_connection'

我尝试将Google App Engine SDK更新到最新版本(1.8.8),我也尝试使用oauth重新进行身份验证(有效).仍然得到相同的消息.任何线索为什么？

提前致谢!

编辑:

看起来我用于数据库连接的设置最近发生了变化.我以前用过:

DATABASES = {
    'default': {
        'ENGINE': 'google.appengine.ext.django.backends.rdbms',
        'INSTANCE': 'project-id:instance-id',
        'NAME': 'name',
    }
}

但现在的建议是:

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'HOST': '/cloudsql/your-project-id:your-instance-name',
        'NAME': 'database-name',
        'USER': 'mysql-user',
    }
}

更新到那之后,我现在收到一个新错误:

Traceback (most recent call last):
  File "./manage.py", line 10, in 
    execute_from_command_line(sys.argv)
  File "/Library/Python/2.7/site-packages/django/core/management/__init__.py", line 399, in execute_from_command_line
    utility.execute()
  File "/Library/Python/2.7/site-packages/django/core/management/__init__.py", line 392, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/Library/Python/2.7/site-packages/django/core/management/base.py", line 242, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/Library/Python/2.7/site-packages/django/core/management/base.py", line 285, in execute
    output = self.handle(*args, **options)
  File "/Library/Python/2.7/site-packages/django/core/management/base.py", line 415, in handle
    return self.handle_noargs(**options)
  File "/c/clients/green_rentals/code/green-rental/south/management/commands/syncdb.py", line 89, in handle_noargs
    db.connection_init() 
  File "/c/clients/green_rentals/code/green-rental/south/db/mysql.py", line 180, in connection_init
    cursor = self._get_connection().cursor()
  File "/Library/Python/2.7/site-packages/django/db/backends/__init__.py", line 159, in cursor
    cursor = util.CursorWrapper(self._cursor(), self)
  File "/Library/Python/2.7/site-packages/django/db/backends/__init__.py", line 129, in _cursor
    self.ensure_connection()
  File "/Library/Python/2.7/site-packages/django/db/backends/__init__.py", line 124, in ensure_connection
    self.connect()
  File "/Library/Python/2.7/site-packages/django/db/utils.py", line 99, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
  File "/Library/Python/2.7/site-packages/django/db/backends/__init__.py", line 124, in ensure_connection
    self.connect()
  File "/Library/Python/2.7/site-packages/django/db/backends/__init__.py", line 112, in connect
    self.connection = self.get_new_connection(conn_params)
  File "/Library/Python/2.7/site-packages/django/db/backends/mysql/base.py", line 435, in get_new_connection
    conn = Database.connect(**conn_params)
  File "/Library/Python/2.7/site-packages/MySQLdb/__init__.py", line 81, in Connect
    return Connection(*args, **kwargs)
  File "/Library/Python/2.7/site-packages/MySQLdb/connections.py", line 187, in __init__
    super(Connection, self).__init__(*args, **kwargs2)
django.db.utils.OperationalError: (2002, "Can't connect to local MySQL server through socket '/cloudsql/your-project-id:your-instance-name' (2)")

(您的project-id:your-instance-name已被适当更改).