通过用户模型，对数据库进行增删改查操作

from flask import Flask, render_template
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)

db.create_all()

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

user = User(username = ‘zhuyinyin‘,password=‘113428164508‘)
db.session.add(user)
db.session.commit()

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

User.query.filter(User.username == ‘zhuyinyin‘).first()
print(user.username,user.password)

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

user=User.query.filter(User.username ==‘zhuyinyin‘).first()
 user.password=‘123‘
print(user.username,user.password)
 db.session.commit()

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

user=User.query.filter(User.username ==‘zhuyinyin‘).first()
db.session.delete(user)
db.session.commit()