GoogleAppEngine 数据存储未返回任何记录
我正在学习如何使用 GoogleAppEngine，并选择 Python 作为语言。
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 类只是为了自己测试一下，但似乎没有记录被保存到数据存储中。我使用 Komodo Edit 作为我的 IDE，因此无法使用断点。
有什么明显的错误吗？
谢谢你！
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好吧，首先我收到以下日志错误（可能只适合我）：
dev_appserver_main.py:466]您使用 FloatProperty 和/或 GeoPtProperty 吗？不幸的是，从数据存储文件加载浮点值不适用于 Python 2.5.0。
必须使用
-c标志删除它。其次，为什么你还有
GreetingdbModel？你没有使用它。不妨将其删除。但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。看看您的命名：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" )它会像魅力一样发挥作用。希望这有帮助。Well, first of all I'm getting error the following log error (it maybe is just for me):
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.
Had to get rid of it using the
-cflag.Second, why do you still have the
GreetingdbModel? You're not using it. Might as well just remove it.But the real mistake is in the query
blogPosts = db.GqlQuery("SELECT * FROM BlogPost ORDER BY date DESC LIMIT 10")you have nodaterow. Look what you named it:postDate = db.DateTimeProperty(auto_now_add=True)Modify your request to say:
blogPosts = db.GqlQuery("SELECT * FROM BlogPost ORDER BY postDate DESC LIMIT 10")and it will work like a charm. Hope this helped.