连接mysql数据库，创建用户模型

from flask import Flask
from flask import render_template
from flask_sqlalchemy import SQLAlchemy
import config

app = Flask(__name__)
app.config.from_object(config)
db=SQLAlchemy(app)

class User(db.Model):
    __tablename__ = ‘user‘
    id=db.Column(db.Integer,primary_key=True,autoincrement=True)
    username=db.Column(db.String(20),nullable=False)   
    password=db.Column(db.String(20),nullable=False)

db.create_all()  


@app.route(‘/‘)
def hello_world():
    return render_template(‘base.html‘)

@app.route(‘/login‘)
def login():
    return render_template(‘login.html‘)

@app.route(‘/regist‘)
def regist():
    return render_template(‘regist.html‘)

@app.route(‘/fabu‘)
def fabu():
    return render_template(‘fabu.html‘)

if __name__ == ‘__main__‘:
    app.run(debug=True)

SQLALCHEMY_DATABASE_URI = ‘mysql+pymysql://root:@localhost:3306/mis_db?charset=utf8‘
SQLALCHEMY_TRACK_MODIFICATIONS = False