tornado + aiomysql + sqlalchemy

前几天写东西时候，就想看看tornado连接数据库方面的东西，看了一些东西，还是觉得挺麻烦的，如果有比较好的方法，希望大家给我推荐一下，谢谢

我的application

import tornado.web
import redis
from utils.mysql_helper import DBcontroller
import asyncio


class MyApplication(tornado.web.Application):
    def __init__(self,*args, **kwargs):
        super(MyApplication, self).__init__(*args, **kwargs)
        self.db = DBcontroller()

setting文件

import os

BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

setting = dict(
    static_path = os.path.join(BASE_DIR, "static"),
    template_path = os.path.join(BASE_DIR, "template"),

    #redis配置
    redis_port = 6379,
    redis_host = "127.0.0.1",

    #mysql配置
    mysql_port = 3306,
    mysql_host = "127.0.0.1",
    mysql_db = "test2",
    mysql_user = "root",
    mysql_password = "abcd@1234",
)

handler

class MainHandler(BaseHandler):
    @gen.coroutine
    def get(self):
        username = self.get_argument("name","")
        password = self.get_argument("password","")
        yield self.application.db.insert(admin_table.user,{"username":username,"password":password})
        self.write("ok")

runserver文件

import tornado.web
import tornado.ioloop
from config.urls import urls
from tornado.options import define,options
from config.setting import setting
from config.my_application import MyApplication

define("port",default=8080,type=int,help="run on the given port")

def main():
    tornado.options.parse_command_line()
    app = MyApplication(urls,**setting)
    app.listen(options.port)
    tornado.ioloop.IOLoop.current().start()    

if __name__ == "__main__":
    main()

创建table

from sqlalchemy import (Table, MetaData, create_engine,
                        Column, Integer, String, SmallInteger, DateTime)

from datetime import datetime
metadata = MetaData()


user = Table("user", metadata,
        Column("password",  String(20), nullable=False),
        Column("username", String(40), nullable=False),
    )

mysql连接工具类

import aiomysql
from config.setting import setting
import asyncio
from aiomysql.sa import create_engine

from tables import admin_table

class DBcontroller:

    __isinstance = False
    def __new__(cls, *args, **kwargs):
        if cls.__isinstance:  # 如果被实例化了
            return cls.__isinstance  # 返回实例化对象
        print('connecting to database...')
        loop = asyncio.get_event_loop()
        loop.run_until_complete(DBcontroller.connect(loop))
        cls.__isinstance = object.__new__(cls)  # 否则实例化
        return cls.__isinstance  # 返回实例化的对象

    @staticmethod
    async def connect(loop):
        __engine = await create_engine(user=setting.get("mysql_user","root"),db=setting.get("mysql_db","test"),host=setting.get("mysql_host","127.0.0.1"),password=setting.get("mysql_password","123456"),loop=loop)
        if __engine:
            DBcontroller.__engine = __engine
            DBcontroller.connectStatue =True
            print('connect to mysql success!')
        else:
            raise ("connect to mysql error ")

    async def insert(self,table,values):
        async with DBcontroller.__engine.acquire() as conn:
            trans = await conn.begin()
            await conn.execute(table.insert(),values)
            await trans.commit()
            DBcontroller.__engine.release(conn)

我使用的tornado的版本是6.0以上的版本，有不对的地方希望大家提点建议，一起学习，一起提升一下自己的能力，谢谢。