here is my code :
# -*- coding: utf-8 -*-
import os
import re
import random
import hashlib
import hmac
from string import letters
import webapp2
import jinja2
from google.appengine.ext import db
template_dir = os.path.join(os.path.dirname(__file__), 'templates')
jinja_env = jinja2.Environment(loader =
jinja2.FileSystemLoader(template_dir),
autoescape = True)
class Handler(webapp2.RequestHandler):
def write(self, *a, **kw):
self.response.out.write(*a, **kw)
def render_str(self, template, **params):
t = jinja_env.get_template(template)
return t.render(params)
def render(self, template, **kw):
self.write(self.render_str(template, **kw))
class MainPage(Handler):
def get(self):
self.write('Hello, guys')
class Book(db.Model):
deal = db.IntegerProperty(required= True)
created = db.DateTimeProperty(auto_now_add=True)
sum_deal = db.IntegerProperty(required= True)
# the code above is
class BookMe(Handler):
def render_book(self,sum_deal="", deal="",error=""):
#sum_deal = 0
deals = db.GqlQuery("SELECT * FROM Book ORDER BY created DESC")
# assign the query content to a variable
self.render("book.html",
sum_deal=sum_deal,deal=deal,error=error,deals=deals)
# render the webpage , take care of the parameters
def get(self):
self.render_book()
def post(self):
deal = int(self.request.get("deal"))
if deal:
b = Book(deal=deal,sum_deal=sum_deal)
for deal in deals:
sum_all += deal.deal
b.put()
self.redirect("/book")
# set a instance of model object then put the data into datastore
else:
error = "we need both a title and some artwork!"
self.render_front(error = error)
class Delete_row(Handler):
def GET(self,dealid):
self.write("i have delete %d"%deal.key().id())
self.redirect('/book')
def POST(self):
dealid = deal.key().id()
todelete = db.get(dealid)
if todelete:
todelete.delete()
app = webapp2.WSGIApplication([('/', MainPage),
('/book', BookMe),
(r'/del/([0-9]+)',Delete_row),
],debug=True)
I want to show the sum of deal in the front page , and i know that
datastore has not that built-in , so i want to iterate all the entities and
sum them up to store it in a variable. but it doesnt work. and i also want
to implement the delete function to delete some contents.
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