tornado的CURD操作
rest api 创建的时候(post),创建成功后把id返回给客户端,客户端就可以通过这个id进行其他操作了
注意post/get风格： 如果针对集合用post /ab/ 而不是 post/ab;如果针对具体实体 get /ab/id
http://technobeans.wordpress.com/2012/09/13/tornado-crud-web-services/
| Resources | HTTP Verbs | Implementation |
| http://localhost/blog/ | POST | Creates a blog |
| http://localhost/blog/id | GET | Displays the blog |
| http://localhost/blog/id | PUT | Updates the blog |
| http://localhost/blog/id | DELETE | Deletes the blog |
| http://localhost/blogs/ | GET | Lists all the blogs |
| http://localhost/blogs/ | DELETE | Deletes all the blogs |
下面代码注意handler的初始化函数和它的传参,把外面的connection传进去了,通过url映射的时候的第三个字典参数
# -*- coding: utf-8 -*-
import tornado.ioloop
import tornado.web
import urlparse
from datetime import datetime
from bson.json_util import dumps
import pymongo
from pymongo import Connection
class Home(tornado.web.RequestHandler):
def initialize(self, connection):
self.conn = connection
self.db = self.conn['blogger']
# Blog's Welcome entry
timestamp = datetime.now()
blog = {
"_id": 1,
"title": "Welcome blog!",
"tags": ["hello world"],
"category": ["welcome"],
"timestamp": timestamp,
}
self.db.blogs.insert(blog)
class Blog(Home):
def get(self, blogid):
"""查看某个blog"""
blog = self.db.blogs.find_one({"_id":int(blogid)})
self.set_header('Content-Type', 'application/json')
self.write(dumps(blog))
def post(self):
"""新建一个blog,***注意,返回给用户有文章id,之后用户可以通过这个id来get等"""
timestamp = datetime.now()
body = urlparse.parse_qs(self.request.body)
for key in body:
body[key] = body[key][0]
# 这里要判断title在集合中是否存在,存在就定向到403,不存在就往下执行
title = body['title']
if self.db.blogs.find_one({"title":title}):
raise tornado.web.HTTPError(403)
# ***生成一个自增的_id
_id = self.db.blogs.count() + 1
blog = {
"_id": _id,
"title": body['title'],
"tags": body['tags'],
"category": body['category'],
"timestamp": timestamp
}
self.db.blogs.insert(blog)
location = "/blog/"+ str(_id)
self.set_header('Content-Type', 'application/json')
self.set_header('Location', location) # 跳转到location这个uri
self.set_status(201)
self.write(dumps(blog))
def put(self, blogid):
"""更新(修改)某个blog"""
_id = int(blogid)
timestamp = datetime.now()
body = urlparse.parse_qs(self.request.body)
for key in body:
body[key] = body[key][0]
blog = {
"title": body['title'],
"tags": body['tags'],
"category": body['category'],
"timestamp": timestamp
}
self.db.blogs.update({"_id":_id}, {"$set":blog})
self.set_header('Content-Type', 'application/json')
self.write(dumps(blog))
def delete(self,blogid):
"""删除某个blog"""
_id = int(blogid)
blog = {
"title": None,
"tags": [],
"category": [],
"timestamp": None,
}
self.db.blogs.remove({"_id":_id})
self.set_header('Content-Type', 'application/json')
self.write(dumps(blog))
class Blogs(Home):
def get(self):
blogs = str(list(self.db.blogs.find()))
self.set_header('Content-Type', 'application/json')
self.write(dumps(blogs))
def delete(self):
blogs = str(list(self.db.blogs.find()))
self.set_header('Content-Type', 'application/json')
self.db.blogs.drop()
self.write(dumps(blogs))
application = tornado.web.Application([
(r"/", Home),
(r"/blog/([0-9]+)", Blog, dict(connection = Connection()) ), # 注意handler初始化函数传参方式,使用字典
(r"/blog/", Blog, dict(connection = Connection()) ),
(r"/blogs/", Blogs, dict(connection = Connection()) ),
],debug=True)
if __name__ == "__main__":
application.listen(8888)
tornado.ioloop.IOLoop.instance().start()
测试代码
import httplib2
from urllib import urlencode
import tornado.escape
import tornado.httpclient
http = httplib2.Http()
print "\nView welcome blog - GET"
headers, content = http.request("http://localhost:7777/blog/1", "GET")
print "Response:", tornado.escape.json_decode(content)
print "Headers:", headers
print "\nCreate new blog - POST"
tags = ['python', 'web']
category = ['www']
data = {'title':'Tornado Web Server', 'tags': tags, 'category':category}
body = urlencode(data)
headers, content = http.request("http://127.0.0.1:7777/blog/", "POST", body=body)
print "Response:", tornado.escape.json_decode(content)
print "Headers:", headers
print "\nView all blogs - GET"
headers, content = http.request("http://localhost:7777/blogs/", "GET")
print "Response:", tornado.escape.json_decode(content)
print "Headers:", headers
print "\nUpdate blog - PUT"
title = "mongo"
tags = ['python', 'DB']
category = ['db']
data = {'title': title, 'tags': tags, 'category':category}
body = urlencode(data)
headers, content = http.request("http://127.0.0.1:7777/blog/2", "PUT", body=body)
print "Response:", tornado.escape.json_decode(content)
print "Headers:", headers
print "\nDeactivate blog - DELETE"
headers, content = http.request("http://127.0.0.1:7777/blog/2", "DELETE")
print "Response:", tornado.escape.json_decode(content)
print "Headers:", headers
print "\nView all blogs - GET"
headers, content = http.request("http://localhost:7777/blogs/", "GET")
print "Response:",tornado.escape.json_decode(content)
print "Headers:", headers
print "\nClear all blogs - DELETE"
http = httplib2.Http()
headers, content = http.request("http://127.0.0.1:7777/blogs/", "DELETE")
print "Response:", tornado.escape.json_decode(content)
print "Headers:", headers