經過用戶模型，對數據庫進行增刪改查操做。

增長：
user = 
db.session.add(user)
db.session.commit()

查詢：
User.query.filter(User.username == 'mis1114').first()

修改：
user.password = '111111'
db.session.commit()

刪除：
db.session.delete(user)
db.session.commit()

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=True,autoincrement=True)
    username=db.Column(db.String(20),nullable=False)
    password = db.Column(db.String(20), nullable=False)
    nickname = db.Column(db.String(20))
db.create_all()

user =db.session.add(user)
db.session.commit()

User.query.filter(User.username == 'mis1114').first()


user.password = '111111'
db.session.commit()


db.session.delete(user)
db.session.commit()

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


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

SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:@127.0.0.1:3306/mis15?charset=utf8'
SQLALCHEMY_TRACK_MODIFICATIONS = False