我正在学习如何将GoogleAppEngine与Python一起使用。
这是我的代码：
import cgi
from google.appengine.api import users
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app
from google.appengine.ext import db
class Greeting(db.Model):
author = db.UserProperty()
content = db.StringProperty(multiline=True)
date = db.DateTimeProperty(auto_now_add=True)
class BlogPost(db.Model):
author = db.UserProperty();
body = db.StringProperty(multiline=True)
postDate = db.DateTimeProperty(auto_now_add=True)
class MainPage(webapp.RequestHandler):
def get(self):
self.response.out.write('<html><body>')
blogPosts = db.GqlQuery("SELECT * FROM BlogPost ORDER BY date DESC LIMIT 10")
greetings = db.GqlQuery("SELECT * FROM Greeting ORDER BY date DESC LIMIT 10")
for post in blogPosts:
if post.author:
self.response.out.write('<b>%s</b>' % post.author.nickname())
else:
self.response.out.write('<b>A guest wrote:</b>')
self.response.out.write(cgi.escape(post.body))
# Write the submission form and the footer of the page
self.response.out.write("""
<form action="/sign" method="post">
<div><textarea name="content" rows="3" cols="60"></textarea></div>
<div><input type="submit" value="Sign Guestbook"></div>
</form>
</body>
</html>""")
class Guestbook(webapp.RequestHandler):
def post(self):
post = BlogPost()
if users.get_current_user():
post.author = users.get_current_user()
post.body = self.request.get('content')
post.put()
self.redirect('/')
application = webapp.WSGIApplication(
[('/', MainPage),
('/sign', Guestbook)],
debug=True)
def main():
run_wsgi_app(application)
if __name__ == "__main__":
main()
我想添加一个BlogPost类只是为了自己进行测试，似乎没有记录被保存到数据存储中。我将Komodo Edit用作IDE，所以不能使用断点。
有任何明显的错误吗？
谢谢！
最佳答案
好吧，首先我收到以下日志错误的错误（也许只是对我来说）：dev_appserver_main.py:466] <class 'google.appengine.api.datastore_errors.InternalError'>Are you using FloatProperty and/or GeoPtProperty? Unfortunately loading float values from the datastore file does not work with Python 2.5.0.
必须使用-c标志摆脱它。
其次，为什么还具有Greeting dbModel？您没有使用它。也可以将其删除。
但是真正的错误是在查询blogPosts = db.GqlQuery("SELECT * FROM BlogPost ORDER BY date DESC LIMIT 10")中您没有date行。看一下你的名字：postDate = db.DateTimeProperty(auto_now_add=True)
将您的请求修改为：blogPosts = db.GqlQuery("SELECT * FROM BlogPost ORDER BY postDate DESC LIMIT 10")，它将像超级按钮一样工作。希望这会有所帮助。
关于python - GoogleAppEngine数据存储区未返回任何记录，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/4697973/