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()

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,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)
    nickname = db.Column(db.String(20))

# db.create_all()

#增
user=User(username='su0002',password='123456')
db.session.add(user)
db.session.commit()
#改
user=User.query.filter(User.username=='su0002').first()
user.password='1234567'
db.session.commit()
#删
user=User.query.filter(User.username=='su0002').first()
db.session.delete(user)
db.session.commit()
#查
user=User.query.filter(User.username=='su0001').first()
print(user.id,user.password)


@app.route('/')
def index():
    return render_template('base.html')

@app.route('/login/')
def login():
    return render_template('login.html')

@app.route('/regist/')
def regist():
    return render_template('regist.html')

@app.route('/question/')
def question():
    return render_template('question.html')

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

　　#增、改

#删、查