通过用户模型，对数据库进行增删改查操作。

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)
    nickname=db.Column(db.String(50))


#db.create_all()
#查询
user = User.query.filter(User.username =='mis666666').first()
print(user.id,user.username,user.password)

#增加
user = User(username ='mis666666',password ='666666')
db.session.add(user)
db.session.commit()


修改
user = User.query.filter(User.username =='mis666666').first()
user.password='111111'
db.session.commit()



删除
user = User.query.filter(User.username =='mis666666').first()
db.session.delete(user)
db.session.commit()




@app.route("/")
def hello_world():
    return 'hello wordl!'

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

SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:@127.0.0.1:3306/mis_15?charset=utf8'
SQLALCHEMY_TRACK_MODIFICATIONS = False

 

增加：
user = 
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()