如何在我的Tornado应用程序中使用Django ORM？

Question

我有一个现有的Django应用程序与数据库和相应的models.py文件.

我有一个新的Tornado应用程序,它为其他应用程序提供Web服务.它需要从同一个数据库读/写,并且我想使用的模型文件中有代码.

如何在我的Tornado请求处理程序中最好地使用Django数据库和模型？是否像创建一个指向models.py Django项目文件夹的符号链接,导入Django模块并使用它一样简单？我想我必须做settings.configure(),对吗？

谢谢!

Answer 1

有一个例子在这里了解如何使用Django ORM和Django的内部龙卷风形式.您可以阅读在Tornado Web Server中使用Django获取一些信息.以下代码取自:

import sys
import os

import tornado.httpserver
import tornado.ioloop
import tornado.web

# django settings must be called before importing models
from django.conf import settings
settings.configure(DATABASE_ENGINE='sqlite3', DATABASE_NAME='dev.db')

from django import forms
from django.db import models

# Define your Model
class Message(models.Model):
    """
    A Django model class.
    In order to use it you will need to create the database manually.

    sqlite> CREATE TABLE message (id integer primary key, subject varchar(30), content varchar(250));
    sqlite> insert into message values(1, 'subject', 'cool stuff');
    sqlite> SELECT * from message;
    """

    subject = models.CharField(max_length=30)
    content = models.TextField(max_length=250)
    class Meta:
        app_label = 'dj'
        db_table = 'message'
    def __unicode__(self):
        return self.subject + "--" + self.content

# Define your Form
class DjForm(forms.Form):
    subject = forms.CharField(max_length=100, required=True)
    content = forms.CharField()

# Define the class that will respond to the URL
class ListMessagesHandler(tornado.web.RequestHandler):
    def get(self):
        messages = Message.objects.all()
        self.render("templates/index.html", title="My title",
                    messages=messages)

class FormHandler(tornado.web.RequestHandler):
    def get(self):
        form = DjForm()
        self.render("templates/form.html", title="My title", form=form)

    def post(self):
        data = {
            'subject':self.request.arguments['subject'][0],
            'content':self.request.arguments['content'][0],
        }
        form = DjForm(data=data)
        if form.is_valid():
            message = Message(**form.cleaned_data)
            message.save()
            self.redirect('/')
        else:
            self.render("templates/form.html", title="My title", form=form)

# map the Urls to the class          
application = tornado.web.Application([
    (r"/", ListMessagesHandler),
    (r"/form/", FormHandler),
])

# Start the server
if __name__ == "__main__":
    http_server = tornado.httpserver.HTTPServer(application)
    http_server.listen(8888)
    tornado.ioloop.IOLoop.instance().start()

这是django和龙卷风的另一个演示 ......

Answer 2

将Django项目的路径添加到Tornado应用程序的PYTHONPATH env-var中,并相应地设置DJANGO_SETTINGS_MODULE.然后,您应该能够导入模型,然后像往常一样使用Django在第一次导入时进行初始设置.

您不应该要求任何符号链接.