连接mysql数据库，创建用户模型

mysql: https://dev.mysql.com/downloads/mysql/

MySQL-python 中间件:
https://www.lfd.uci.edu/~gohlke/pythonlibs/#mysql-python

pip install mysqlclient-1.3.12-cp36-cp36m-win_amd64.whl

pip install flask-sqlalchemy

创建数据库

from flask_sqlalchemy import SQLAlchemy

配置：SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:xxxxx@localhost:3306/test?charset=utf8'
SQLALCHEMY_TRACK_MODIFICATIONS = False

import config

app.config.from_object(config)
db = SQLAlchemy(app)
db.create_all()

from flask import  Flask
from  flask_sqlalchemy import SQLAlchemy
import config

app = 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)



db.create_all()

@app.route('/')
def hello_word():
    return 'Hello World'

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

from flask_sqlalchemy import SQLAlchemy
SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:@localhost:3306/mis15?charset=utf8'
SQLALCHEMY_TRACK_MODIFICATIONS = False