我已经使用了应用引擎的入门指南。但是我无法使用数据存储区。
在运行指南中提供的简单代码时，我收到“无法访问应用程序数据”错误。
我的代码：
import cgi
import datetime
import urllib
import webapp2
from google.appengine.ext import db
from google.appengine.api import users
MAIN_PAGE_FOOTER_TEMPLATE = """\
<form action="/sign?%s" method="post">
<div><textarea name="content" rows="3" cols="60"></textarea></div>
<div><input type="submit" value="Sign Guestbook"></div>
</form>
<hr>
<form>Guestbook name: <input value="%s" name="guestbook_name">
<input type="submit" value="switch"></form>
</body>
</html>
"""
class Greeting(db.Model):
"""Models an individual Guestbook entry with author, content, and date."""
author = db.StringProperty()
content = db.StringProperty(multiline=True)
date = db.DateTimeProperty(auto_now_add=True)
def guestbook_key(guestbook_name=None):
"""Constructs a Datastore key for a Guestbook entity with guestbook_name."""
return db.Key.from_path('Guestbook', guestbook_name or 'default_guestbook')
class MainPage(webapp2.RequestHandler):
def get(self):
self.response.write('<html><body>')
guestbook_name = self.request.get('guestbook_name')
# Ancestor Queries, as shown here, are strongly consistent with the High
# Replication Datastore. Queries that span entity groups are eventually
# consistent. If we omitted the ancestor from this query there would be
# a slight chance that Greeting that had just been written would not
# show up in a query.
greetings = db.GqlQuery("SELECT * "
"FROM Greeting "
"WHERE ANCESTOR IS :1 "
"ORDER BY date DESC LIMIT 10",
guestbook_key(guestbook_name))
for greeting in greetings:
if greeting.author:
self.response.write(
'<b>%s</b> wrote:' % greeting.author)
else:
self.response.write('An anonymous person wrote:')
self.response.write('<blockquote>%s</blockquote>' %
cgi.escape(greeting.content))
# Write the submission form and the footer of the page
sign_query_params = urllib.urlencode({'guestbook_name': guestbook_name})
self.response.write(MAIN_PAGE_FOOTER_TEMPLATE %
(sign_query_params, cgi.escape(guestbook_name)))
class Guestbook(webapp2.RequestHandler):
def post(self):
# We set the same parent key on the 'Greeting' to ensure each greeting
# is in the same entity group. Queries across the single entity group
# will be consistent. However, the write rate to a single entity group
# should be limited to ~1/second.
guestbook_name = self.request.get('guestbook_name')
greeting = Greeting(parent=guestbook_key(guestbook_name))
if users.get_current_user():
greeting.author = users.get_current_user().nickname()
greeting.content = self.request.get('content')
greeting.put()
query_params = {'guestbook_name': guestbook_name}
self.redirect('/?' + urllib.urlencode(query_params))
app = webapp2.WSGIApplication([('/', MainPage),
('/sign', Guestbook)],
debug=True)
我已经在服务器上上传了应用程序，但仍然遇到同样的错误。
Traceback (most recent call last):
File "/home/laxman/google_appengine/lib/webapp2/webapp2.py", line 1535, in __call__
rv = self.handle_exception(request, response, e)
File "/home/laxman/google_appengine/lib/webapp2/webapp2.py", line 1529, in __call__
rv = self.router.dispatch(request, response)
File "/home/laxman/google_appengine/lib/webapp2/webapp2.py", line 1278, in default_dispatcher
return route.handler_adapter(request, response)
File "/home/laxman/google_appengine/lib/webapp2/webapp2.py", line 1102, in __call__
return handler.dispatch()
File "/home/laxman/google_appengine/lib/webapp2/webapp2.py", line 572, in dispatch
return self.handle_exception(e, self.app.debug)
File "/home/laxman/google_appengine/lib/webapp2/webapp2.py", line 570, in dispatch
return method(*args, **kwargs)
File "/home/laxman/helloworld/helloworld.py", line 51, in get
for greeting in greetings:
File "/home/laxman/google_appengine/google/appengine/ext/db/__init__.py", line 2326, in next
return self.__model_class.from_entity(self.__iterator.next())
File "/home/laxman/google_appengine/google/appengine/datastore/datastore_query.py", line 2892, in next
next_batch = self.__batcher.next()
File "/home/laxman/google_appengine/google/appengine/datastore/datastore_query.py", line 2754, in next
return self.next_batch(self.AT_LEAST_ONE)
File "/home/laxman/google_appengine/google/appengine/datastore/datastore_query.py", line 2791, in next_batch
batch = self.__next_batch.get_result()
File "/home/laxman/google_appengine/google/appengine/api/apiproxy_stub_map.py", line 604, in get_result
return self.__get_result_hook(self)
File "/home/laxman/google_appengine/google/appengine/datastore/datastore_query.py", line 2528, in __query_result_hook
self._batch_shared.conn.check_rpc_success(rpc)
File "/home/laxman/google_appengine/google/appengine/datastore/datastore_rpc.py", line 1224, in check_rpc_success
raise _ToDatastoreError(err)
BadRequestError: app "dev~helloworld" cannot access app "dev~hellolxmn"'s data