连接mysql数据库，创建用户模型

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

from flask import Flask
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=TabError,autoincrement=True)
    username=db.Column(db.String(20),nullable=False)
    password=db.Column(db.String(20),nullable=False)
    phone=db.Column(db.String(20),nullable=False)
    email=db.Column(db.String(20),nullable=False)


db=create_all()

@app.route(‘/‘)
def hello_world():
    return ‘Hello World!‘


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