通过用户模型，对数据库进行增删改查操作。

Posted 2020-10-14 105杨捷丽

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
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),nullable=False)
    #   db.create_all()
    
# 增加
user = User(username=\'mis1114\',password = \'mis1114\')
db.session.add(user)
db.session.commit()

# 查询
user =User.query.filter(User.username ==\'mis1114\').first()

# 删除
user =User.query.filter(User.username ==\'mis1114\').first()
print(user.username,user.password)
db.session.delete(user)
db.session.commit()

# 修改
user =User.query.filter(User.username ==\'mis1114\').first()
user.password=\'111111\'
print(user.username,user.password)
db.session.commit()



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


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