from flask import Flaskfrom flask_sqlalchemy import SQLAlchemyimport configapp =Flask(__name__)app.config.from_object(config)db=SQLAlchemy(app)# 创建用户模型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)    nickname=db.Column(db.String(50))db.create_all()@app.route("/")def hello_world():    return 'hello wordl!'if __name__ == '__main__':    app.run()

　　

SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:@127.0.0.1:3306/mis_db?charset=utf8'SQLALCHEMY_TRACK_MODIFICATIONS = False