python增删改查的框架_Python ORM框架 flask_sqlalchemy 实现增删改查

1、安装 flask_sqlalchemy 和 Flask

注意：如果没有安装 conda 请查看Anaconda安装教程

conda install PyMySQL

conda install flask_sqlalchemy

conda install Flask

如果安装flask-sqlalchemy失败，请查看一下文档

conda install -c conda-forge flask-sqlalchemy

2、创建配置文件 config.py

HOST = "127.0.0.1"

PORT = "3306"

DB = "smart_medicine"

USER = "root"

PASS = ""

CHARSET = "utf8"

DB_URI = "mysql+pymysql://{}:{}@{}:{}/{}?charset={}".format(USER, PASS, HOST, PORT, DB, CHARSET)

SQLALCHEMY_DATABASE_URI = DB_URI

3、编写数据库映射对象，并进行CURD操作

from flask_sqlalchemy import SQLAlchemy

from datetime import datetime

from flask import Flask

import config

app = Flask(__name__)

app.config.from_object(config)

# 设置每次请求结束后会自动提交数据库中的改动

app.config['SQLALCHEMY_COMMIT_ON_TEARDOWN'] = True

# 打印 SQL语句

app.config['SQLALCHEMY_ECHO'] = True

db = SQLAlchemy(app)

# 创建 User 对象

class Users(db.Model):

__tablename__ = 'users_info'

id = db.Column(db.Integer, primary_key=True, autoincrement=True)

username = db.Column(db.String(32), nullable=False)

password = db.Column(db.String(100), nullable=False)

email = db.Column(db.String(100), nullable=False)

register_time = db.Column(db.DateTime, nullable=False, default=datetime.now())

# 创建表

# db.create_all()

# 插入数据

us1 = Users(username='wang', email='[email protected]', password='123456')

db.session.add(us1)

# 查询数据

user = Users.query.filter(Users.username == 'wang').first()

print(user)

# 修改

wang = Users.query.filter(Users.username == 'wang').first()

wang.email = "[email protected]"

db.session.commit()

wang = Users.query.filter(Users.username == 'wang').first()

print(wang)

# 删除

# result = Users.query.filter(Users.username == 'wang').first()

# db.session.delete(result)

# 查询10条记录

users = Users.query.limit(10).all()

print(users)

# 查询所以数据

result = Users.query.all()

print(user)

4、更多细节碎片的知识