连接mysql数据库，创建用户模型

 1 from flask import Flask, render_template
 2 from flask_sqlalchemy import SQLAlchemy
 3 import config
 4 
 5 app = Flask(__name__)
 6 app.config.from_object(config)
 7 db=SQLAlchemy(app)
 8 
 9 class User(db.Model):
10     __tablename__=‘user‘
11     id = db.Column(db.Integer,primary_key=True,autoincrement=True)
12     username=db.Column(db.String(20),nullable=False)
13     password=db.Column(db.String(20),nullable=False)
14 
15 db.create_all()
16 
17 @app.route(‘/‘)
18 def index():
19     return render_template(‘index.html‘)
20 
21 @app.route(‘/login/‘)
22 def login():
23     return render_template(‘login.html‘)
24 
25 @app.route(‘/regist/‘)
26 def register():
27     return render_template(‘regist.html‘)
28 
29 @app.route(‘/base/‘)
30 def base():
31     return render_template(‘base.html‘)
32 
33 @app.route(‘/question/‘)
34 def question():
35     return render_template(‘question.html‘)
36 
37 if __name__ == ‘__main__‘:
38     app.run()

SQLALCHEMY_DATABASE_URI=‘mysql+pymysql://root:123456@127.0.0.1:3306/ni_db?charset=utf8‘
SQLALCHEMY_TRACK_MODIFICATTONS = False