Python中日期相等的GQL查询

2024-10-05 10:17:34 发布

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好吧，你们上次很快就帮了忙，所以我要回井里去；）

免责声明：我对python很陌生，对App Engine也很陌生。我要做的是对AppEngine教程中的示例进行简单的修改。

我的日期值存储在内存类中：

class Memory(db.Model):
    author = db.UserProperty()
    content = db.StringProperty(multiline=True)
    date = db.DateProperty(auto_now_add=True)

现在我希望能够查找特定日期的记录。我不知道该怎么做，所以我尝试了一些事情，包括：

memories = db.GqlQuery("SELECT * from Memory where date = '2007-07-20')
and
memories = Memory.all()
memories.filter("date=", datetime.strptime(self.request.get('date'), '%Y-%m-%d').date())
and
memories = Memory.all()
memories.filter("date=", self.request.get('date'))

但每次我运行它，我都会感到非常害怕。坦白地说，我甚至不知道如何解析应用程序失败时得到的这些错误消息，但我很高兴能够查找特定日期的内存记录。

编辑：下面是完整的源代码

import cgi
import time

from datetime import datetime
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 Memory(db.Model):
    author = db.UserProperty()
    content = db.StringProperty(multiline=True)
    date = db.DateProperty()

class MainPage(webapp.RequestHandler):
    def get(self):
        self.response.out.write('<html><body>')

        memories = db.GqlQuery('SELECT * from Memory ORDER BY date DESC LIMIT 10')

        for memory in memories:
            self.response.out.write('<b>%s</b> wrote: ' % memory.author.nickname())
            self.response.out.write('<em>%s</em>' % memory.date)
            self.response.out.write('<blockquote>%s</blockquote>' % cgi.escape(memory.content))

        self.response.out.write("""
<div style="float: left;">
<form action="/post" method="post">
    <fieldset>
    <legend>Record</legend>
    <div><label>Memory:</label><input type="text" name="content" /></textarea></div>
    <div><label>Date:</label><input type="text" name="date" /></div>
    <div><input type="submit" value="Record memory" /></div>
    </fieldset>
</form>
</div>
<div style="float: left;">
<form action="/lookup" method="post">
    <fieldset>
    <legend>Lookup</legend>
    <div><label>Date:</label><input type="text" name="date" /></div>
    <div><input type="submit" value="Lookup memory" /></div>
    </fieldset>
</form>
</div>""")

        self.response.out.write('</body></html>')

class PostMemory(webapp.RequestHandler):
    def post(self):
        memory = Memory()

        if users.get_current_user():
            memory.author = users.get_current_user()

        memory.content = self.request.get('content')
        memory.date = datetime.strptime(self.request.get('date'), '%Y-%m-%d').date()

        memory.put()
        self.redirect('/')

class LookupMemory(webapp.RequestHandler):
    def post(self):
        memories = db.GqlQuery("SELECT * FROM Memory WHERE date = '2009-07-21'")

        for memory in memories:
            self.response.out.write('<b>%s</b> wrote: ' % memory.author.nickname())
            self.response.out.write('<em>%s</em>' % memory.date)
            self.response.out.write('<blockquote>%s</blockquote>' % cgi.escape(memory.content))     

application = webapp.WSGIApplication([('/', MainPage), ('/post', PostMemory), ('/lookup', LookupMemory)], debug=True)

def main():
    run_wsgi_app(application)

if __name__ == '__main__':
    main()

Tags： fromimportselfdivdbgetdateresponse
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