Tornadao—异步

tornado异步化
异步访问

tornado异步化

import time

import tornado.web
import tornado.ioloop
import asyncio
class IndexHandler(tornado.web.RequestHandler):
     async def get(self):
        await asyncio.sleep(5)
        self.write(time.ctime())

def main():
    app = tornado.web.Application([(r'/',IndexHandler)],debug=True)
    app.listen(8888)
    print("server start")
    tornado.ioloop.IOLoop.current().start()

if __name__ == '__main__':
    main()

异步访问

from tornado.web import StaticFileHandler, RedirectHandler
from aiomysql import create_pool
import time

from tornado import web
import tornado
from tornado.web import template

class MainHandler(web.RequestHandler):
    def initialize(self, db):
        self.db = db
    # 异步访问
    async def get(self, *args, **kwargs):
        uid = ""
        username = ""
        password = ""

        async with create_pool(host=self.db["host"], port=self.db["port"],
                               user=self.db["user"], password=self.db["password"],
                               db=self.db["name"], charset="utf8") as pool:
            async with pool.acquire() as conn:
                async with conn.cursor() as cur:
                    await cur.execute("SELECT uid, username, password from user")
                    try:
                        uid, username, password = await cur.fetchone()
                    except Exception as e:
                        print(e)
                        pass
        self.render("message.html", uid=uid,  username=username, password=password)
# 配置
settings = {
    "static_path": "static",#静态资源路径
    "template_path": "templates",   #模板路径
    'debug':True,
    "db": {    #数据库配置
        "host": "127.0.0.1",
        "user": "root",
        "password": "xxx",
        "name": "xxxx",
        "port": 3306
    }
}

if __name__ == "__main__":
    app = web.Application([
        ("/", MainHandler, {"db": settings["db"]}),], **settings)
    app.listen(8888)
    tornado.ioloop.IOLoop.current().start()

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>用户信息</title>
</head>
<body>
<p>{{ uid }}</p>
<p>{{ username }}</p>
<p>{{ password }}</p>
</body>
</html>

Jhinhua

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