通过用户模型，对数据库进行增删改查操作

增加：
db.session.add(user)
db.session.commit()

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

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

删除：
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=User.query.filter(User.username=='mis1',password='mis1')
db.session.add(user)
db.session.commit()
'''


user=User.query.filter(User.username=='mis1').first()
user.password='123456'
user.username='mis1'
print(user.username,user.password)
db.session.commit()


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

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