每隔几秒更新一次 HttpResponse [英] Update HttpResponse Every Few Seconds

问题描述

我在 Django 中的应用程序可以创建一些 非常 大的 SQL 查询.我目前使用 HttpRequest 对象来获取我需要的数据，然后使用 HttpResponse 来返回我想要显示给用户的内容.

My application in Django can create some very big SQL queries. I currently use a HttpRequest object, for the data I need, then a HttpResponse, to return what I want to show the User.

显然，我可以让用户等待一分钟，同时执行这些多组查询并从数据库中提取，然后返回这个单一的 HTML 页面.

Obviously, I can let the User wait for a minute whilst these many sets of queries are being executed and extracted from the database, then return this monolothic HTML page.

理想情况下，我想在需要时更新页面，例如:

Ideally, I'd like to update the page when I want, something like:

For i,e in enumerate(example):

    Table.objects.filter(someObjectForFilter[i]).

    #Return the object to the page.
    #Then Loop again, 'updating' the response after each iteration.

这可能吗?

推荐答案

我最近发现一个HttpResponse可以是一个生成器:

I discovered recently that an HttpResponse can be a generator:

def myview(request, params):
    return HttpResponse(mygenerator(params))


def mygenerator(params):
    for i,e in enumerate(params):
        yield '<li>%s</li>' % Table.objects.filter(someObjectForFilter[i])

这将逐步将 mygenerator 的结果返回到页面，并以 HTML <li> 进行显示.

This will progressively return the results of mygenerator to the page, wrapped in an HTML <li> for display.

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