定期获取数据并使用Django显示 [英] Periodically fetch data and display it with Django

问题描述

我想在我的Django应用程序中实现一种实时"通知系统.

I would like to implement a kind of "real-time" notification system in my Django application.

我会将一些发给特定用户的消息存储在数据库中. 当用户登录到应用程序中时，如果数据库中有针对他的通知，则该应用程序将使用消息框架显示该通知. 当他单击该消息时，该消息将从数据库中删除.

I would store some messages destined to a specific user in my database. When a user is logged in the application, if there is a notification for him in the database, then the application displays it using the messages framework. When he clicks on the message, it is deleted from the database.

我有点卡在每分钟获取数据"的东西上.我听说过芹菜( http://docs.celeryproject.org/en/latest/#)，但我想确定这是潜水之前去那里的方法，因为它的设置和使用似乎有些复杂.

I am a bit stuck on the "fetch the data every minute" thing. I heard of celery (http://docs.celeryproject.org/en/latest/#), but I would like to be sure it is the way to go there before diving in, because it seems a bit complicated to set up and use.

如果有一种简便的方法来守护Django功能，或者已经存在与我想要做的类似的事情，我将不胜感激！

If there is an easy way to daemonise a django fonction, or if something similar to what I want to do already exist, I would appreciate any hint !

推荐答案

如果只是简单的任务，则可以使用Ajax.

If is just a simple task, you may do with Ajax.

只需为ajax查询声明一个URL:

Just declare one URL for the ajax query:

#urls.py

...
url(r'^ajax/my_query$', my_app.views.ajax_processor)
...

然后在您的my_app/views.py中:

#views.py

def ajax_processor(request):

    ... do the processing you want as if it is a normal web request.
    ... like querying the database
    ... you can return a `json` dictionary 
    ... or a normal `render_to_response` template with html

那应该在服务器端完成.在客户端，将jQuery与$.ajax函数一起使用并执行以下操作将很可爱:

That should do on the server side. On the client side it would be lovely to use jQuery with the $.ajax function and do this:

$.ajax({
    url:'/ajax/my_query',  // a normal get request
    success:function(data){  // success is the callback when the server responds
        /* if is json what you decided to return then process the json dict
           if is normal html render it wherver you want
        */
    }
});

这只是一个简单的设置，在服务器端有一些代码，在客户端有一些代码.

Is just a simple set up, a bit of code in server-side and a bit of code in client-side.

如果您打算开发一个高度实时的应用程序，那么您应该依赖一个更好的库，但是如果您只需要进行少量异步查询，那么您可以考虑采用这种方式.

If you are planning to develop a heavily real-time based application then you should rely on a better library, but if you only need to do a little query asynchronous then you may consider this way.

这是W3Schools提供的一个很好且简单的Ajax教程，可帮助您了解Ajax，和此处，您可以找到有关使用ajax/jquery进行轮询的有用信息.

Here is a good and simple ajax tutorial provided by the W3Schools to help you understand Ajax, and here you can find useful information about polling with ajax/jquery.

祝你好运！

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