通过用户模型，对数据库进行增删改查操作

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

#增加
user=User(username='mis1234',password='111111')
db.session.add(user)
db.session.commit()

 

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

#查询
user = User.query.filter(User.username == 'mis1234').first()
print(user.id,user.password)

 

 

 

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

#修改
user = User.query.filter(User.username=='mis114').first()
user.password='499679642'
db.session.commit()

 

 

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

#删除
user = User.query.filter(User.username == 'mis1234').first()
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()
#增加
user=User(username='mis114',password='111111')
db.session.add(user)
db.session.commit()
#查询
user = User.query.filter(User.username == 'mis1234').first()
print(user.id,user.password)
#修改
user = User.query.filter(User.username=='mis114').first()
user.password='499679642'
db.session.commit()
#删除
user = User.query.filter(User.username == 'mis1234').first()
db.session.delete(user)
db.session.commit()
@app.route('/')
def hello_world():
    return 'Hello World!'


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