GAE数据存储Put()

Question

def post(self):
    update = self.request.get('update')

    if users.get_current_user():
        if update:
            personal = db.GqlQuery("SELECT * FROM Personal WHERE __key__ = :1", db.Key(update))

            personal.name = self.request.get('name')
            personal.gender = self.request.get('gender')
            personal.mobile_num = self.request.get('mobile_num')
            personal.birthdate = int(self.request.get('birthdate'))
            personal.birthplace = self.request.get('birthplace')
            personal.address = self.request.get('address')
            personal.geo_pos = self.request.get('geo_pos')
            personal.info = self.request.get('info')
            photo = images.resize(self.request.get('img'), 0, 80)
            personal.photo = db.Blob(photo)
            personal.put()
            self.redirect('/admin/personal')
        else:
            personal= Personal()

            personal.name = self.request.get('name')
            personal.gender = self.request.get('gender')
            personal.mobile_num = self.request.get('mobile_num')
            personal.birthdate = int(self.request.get('birthdate'))
            personal.birthplace = self.request.get('birthplace')
            personal.address = self.request.get('address')
            personal.geo_pos = self.request.get('geo_pos')
            personal.info = self.request.get('info')
            photo = images.resize(self.request.get('img'), 0, 80)
            personal.photo = db.Blob(photo)
            personal.put()
            self.redirect('/admin/personal')

    else:
        self.response.out.write('I\'m sorry, you don\'t have permission to add this LP Personal Data.')

如果' update‘是包含关键数据存储关键字的查询字符串，这是否会更新现有记录。我尝试了一下，但是一直在添加新的记录/实体。请给我一些正确更新记录/实体的建议。

更正？：

def post(self):
    update = self.request.get('update')

    if users.get_current_user():
        if update:
            personal = Personal.get(db.Key(update))

            personal.name = self.request.get('name')
            personal.gender = self.request.get('gender')
            personal.mobile_num = self.request.get('mobile_num')
            personal.birthdate = int(self.request.get('birthdate'))
            personal.birthplace = self.request.get('birthplace')
            personal.address = self.request.get('address')
            personal.geo_pos = self.request.get('geo_pos')
            personal.info = self.request.get('info')
            photo = images.resize(self.request.get('img'), 0, 80)
            personal.photo = db.Blob(photo)
            personal.put()
            self.redirect('/admin/personal')
        else:
            personal= Personal()

            personal.name = self.request.get('name')
            personal.gender = self.request.get('gender')
            personal.mobile_num = self.request.get('mobile_num')
            personal.birthdate = int(self.request.get('birthdate'))
            personal.birthplace = self.request.get('birthplace')
            personal.address = self.request.get('address')
            personal.geo_pos = self.request.get('geo_pos')
            personal.info = self.request.get('info')
            photo = images.resize(self.request.get('img'), 0, 80)
            personal.photo = db.Blob(photo)
            personal.put()
            self.redirect('/admin/personal')

    else:
        self.response.out.write('I\'m sorry, you don\'t have permission to add this LP Personal Data.')

Answer 1

当您知道键时，不需要执行查询:只需在键上调用db.get()直接检索它，这比执行查询快得多。

至于为什么你每次都要创建一条新记录，看起来你没有正确地将“update”传递给你的页面。尝试记录查询字符串参数，看看出了什么问题。

Answer 2

我终于自己回答了这个问题，感谢Nick Johnson在这方面的指导。我无法将查询字符串url作为'string key‘获取，它总是引发BadKeyError: Invalid string key异常。

我尝试将这个'update‘字符串作为隐藏字段放在html编辑表单上，这是可行的，因为'update’现在是一个有效的'string key‘。

def post(self):
    update = self.request.get('update')

    if users.get_current_user():
        if update != '':
            personal = Personal.get(db.Key(update))