连接mysql数据库，创建用户模型

1.安装与配置python3.6+flask+mysql数据库

(1)下载安装MySQL数据库

(2)下载安装MySQL-python 中间件

(3)pip install flask-sqlalchemy （Python的ORM框架SQLAlchemy）

2.mysql创建数据库

3.数据库配置信息config.py

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

4.建立mysql和app的连

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

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

db=SQLAlchemy(app)

5.创建用户模型

from flask import Flask,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)
    nickname = db.Column(db.String(50))

db.create_all()

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

@app.route('/register')
def register():
    return render_template('register.html')

@app.route('/question')
def question():
    return render_template('question.html')

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

@app.route('/')
def index():
    return render_template('index.html')

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