我是编程新手，我正在努力掌握GAE数据存储的概念。我正在尝试构建一个应用程序，以便轻松编写合同（http://contractpy.appspot.com）。目前，我正在通过URL传递我需要的所有值来渲染合同模板：
self.redirect('/your_contract?person=%s&nacionality=%s&profession=%s&maritalStatus=%s&SSN=%s&driverLicense=%s&email=%s&witness=%s&owner=%s&contractType=%s&address=%s' % (person_name, user_nacionality, user_profession, user_maritalStatus, user_SSN, user_driverLicense, user_email,
#witness, owner, contractType, address))
但这样做仍然只限于一个人（而且，将来，我需要在同一份合同中提供多个人的数据）。
我想使用GAE数据存储区查询来填充模板“your_contract.html”的变量值，而不是这样做。
我知道这是一个简单的问题，但GAE数据存储对我来说是完全模糊的（我还没有掌握“数据存储的禅”，但我对SQL有一点了解）而且我正在学习OOProgramming。我看了this article，我试图关注this sample（Google guess_booK示例），但这些大脑还不够。那么，在一个模板中渲染多个人数据的最佳方法是什么？ （班级人员在下面的代码中）
我这样想：通过URL传递一个列表，其中包含每个人的一个数据（例如：驾驶执照号码）：
self.redirect('/your_contract?driverLicense=%s' % (driverLicenseList))
并且，在处理程序“your_contract”中，使用“diverLicenseList”的值（在交互列表之后）来查询GAE数据存储区，如下所示：
x = self.request.get('SSN')
contractingParty = db.GqlQuery("SELECT FROM Person WHERE SSN IS x")
这是正确的道路吗？ 在此先感谢您的帮助！
我的原始代码（在进行GAE查询之前）在这里：
# -*- coding: utf-8 -*-
# -*- coding: utf-8 -*-
#!/usr/bin/env python
#
# Copyright 2007 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import os
import webapp2
import jinja2
jinja_environment = jinja2.Environment(autoescape=True,
loader=jinja2.FileSystemLoader(os.path.join(os.path.dirname(__file__), 'templates')))
import re
from google.appengine.ext import db
USER_RE = re.compile(r"^[a-zA-Z0-9_ -]{3,20}$")
def valid_person(person):
return USER_RE.match(person)
PASS_RE = re.compile(r"^.{3,20}$")
def valid_SSN(SSN):
return PASS_RE.match(SSN)
EMAIL_RE = re.compile(r"^[\S]+@[\S]+\.[\S]+$")
def valid_email(email):
return EMAIL_RE.match(email)
import time
import datetime
def dateToday():
today = datetime.datetime.today()
todayDay = str(today.day)
todayMonth = str(today.month)
monthExt = {'1':' January ', '2':'February', '3':' March ', '4':'April', '5':'May', '6':'June', '7':' July ', '8':'August', '9':'September', '10':'October', '11':'November ', '12':'December'}
todayYear = str(today.year)
return(todayDay + ' of ' + monthExt[todayMonth] + ' of ' + todayYear)
class MainHandler(webapp2.RequestHandler):
def get(self):
template_values = {"person": "",
"SSN": "",
"driverLicense": "",
"email":"",
"person_error": "",
"SSN_error": "",
"driverLicense_error": "",
"address": "",
"email_error": ""}
template = jinja_environment.get_template('index.html')
self.response.out.write(template.render(template_values))
def post(self):
person_name = self.request.get("person")
user_nacionality = self.request.get('nacionality')
user_profession = self.request.get('profession')
user_maritalStatus = self.request.get('maritalStatus')
user_SSN = self.request.get('SSN')
user_email = self.request.get('email')
user_driverLicense = self.request.get('driverLicense')
person_error = ""
SSN_error = ""
driverLicense_error = ""
geted_email_error = ""
address = self.request.get('address')
contractType = self.request.get("contractType")
owner = self.request.get("owner")
witness = self.request.get("witness")
if (person_name and valid_person(person_name)) and (user_SSN and valid_SSN(user_SSN)) and ((not user_email) or (user_email and valid_email(user_email))):
a = People(firstName = person_name,
nacionality = user_nacionality,
maritalStatus = user_maritalStatus,
profession = user_profession,
SSN = int(user_SSN),
driverLicense = int(user_driverLicense)
#address = user_address
)
a.put()
self.redirect('/your_contract?person=%s&nacionality=%s&profession=%s&maritalStatus=%s&SSN=%s&driverLicense=%s&email=%s&witness=%s&owner=%s&contractType=%s&address=%s' % (person_name, user_nacionality, user_profession, user_maritalStatus, user_SSN, user_driverLicense, user_email,
witness, owner, contractType, address))
else:
if not person_name or not valid_person(person_name):
person_error = "Oh no!!! this person name isn't valid!"
if not user_SSN or not valid_SSN(user_SSN):
SSN_error = "Oh no!!! SSN isn't valid!"
if user_email and not valid_email(user_email):
geted_email_error = "Oh no!!! e-mail isn't valid!"
template_values = {"person": person_name,
"nacionality": user_nacionality,
"maritalStatus": user_maritalStatus,
"profession": user_profession,
"SSN": user_SSN,
"driverLicense": user_driverLicense,
"email": user_email,
"person_error": person_error,
"SSN_error": SSN_error,
"driverLicense_error": user_driverLicense,
"address": address,
"email_error": geted_email_error}
template = jinja_environment.get_template('index.html')
self.response.out.write(template.render(template_values))
class your_contractHandler(webapp2.RequestHandler):
def get(self):
geted_person_name = self.request.get('person')
geted_user_nacionality = self.request.get("nacionality")
geted_user_profession = self.request.get("profession")
geted_user_maritalStatus = self.request.get("maritalStatus")
geted_user_SSN = self.request.get('SSN')
geted_user_email = self.request.get('email')
geted_user_driverLicense = self.request.get('driverLicense')
geted_person_error = ""
geted_SSN_error = ""
geted_driverLicense_error = ""
geted_address = self.request.get('address')
geted_owner = self.request.get("owner")
geted_witness = self.request.get("witness")
geted_contractType = self.request.get("contractType")
geted_dateToday = dateToday()
your_contract = jinja_environment.get_template('your_contract.html')
your_contract_values = {"person":geted_person_name,
"nacionality":geted_user_nacionality,
"maritalStatus": geted_user_maritalStatus,
"profession": geted_user_profession,
"SSN":geted_user_SSN,
"driverLicense":geted_user_driverLicense,
"address":geted_address,
"email":geted_user_email,
"contractType":geted_contractType,
"dateContract":geted_dateToday,
}
template = jinja_environment.get_template('index.html')
self.response.out.write(your_contract.render(your_contract_values))
class People(db.Model):
name = db.StringProperty(required = True)
nacionality = db.StringProperty(required = True)
maritalStatus = db.StringProperty(required = True)
profession = db.StringProperty(required = True)
SSN = db.IntegerProperty(required = True)
driverLicense = db.IntegerProperty(required = True)
# address = db.PostalAdressProperty(required = True)
# condition = db.StringProperty(required = False, choices=set(["buyer", "seller", "renter", "owner", "witness"]))
##class Acts(db.Model):
## firstPart = db.StringProperty(required = True)
## secondPart = db.StringProperty(required = True)
## contractNumber = db.IntegerProperty(required = False)
## contractDate = db.DateProperty(auto_now_add=True)
## contractDraft = db.TextProperty(required = True)
app = webapp2.WSGIApplication([('/', MainHandler), ('/your_contract', your_contractHandler)],
debug=True)
答案 0 :(得分：1)
您的代码中存在几个问题，从设计开始。
您应该有两个存储在数据存储区中的类（合同和人员） （如果您使用的是NDB，您可以与人员签订一份结构化财产的合同，但我们会保持简单。）
合同可以包含合同所需的任何东西，然后有合同 people = ListProperty（db.Key）
在放入（）模型实例之后，将使用键填充db.key（）。这就是你应该传递给代码的其他部分并存储在上面的ListProperty中。
例如，在POST后的重定向中，你会有类似的东西 self.redirect（'/ your_contract？person =％s'％a.key（）'）
要加载存储的人，您需要执行以下操作： person = db.get（self.request.get（'person'））
如果您要传递多个人密钥，则必须仔细检查webob文档，了解如何使用查询字符串中的相同密钥读取多个值，但我知道它会以列表形式返回。
希望这有帮助