2.3 启动服务前必做三件事：数据库初始化、管理员账号创建、静态资源检查 绝大多数 Python 商城源码默认用 SQLite（轻量、免配置），但常忽略两件事： ① db.sqlite3 文件不存在时，代码不会自动建库建表； ② 管理员账号需手动创建，否则后台进不去。

BaseDao （Database Access Object，数据库访问对象）就是来解决这件事的。它把「拿连接、开游标、执行 SQL、提交或回滚、关闭资源」这套重复动作收敛到一个基类里，业务层只关心 SQL 和参数，不再关心连接生命周期。用 pymysql 实现的好处是纯 Python、无额外 C 依赖、装完就能跑，适合中小型项目快速落地。

In this quickstart, you connect a Python script to a database that you created and loaded with sample data. You use the mssql-python driver for Python to connect to your database and perform basic ...

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Dans ce guide de démarrage rapide, vous connectez un script Python à une base de données que vous avez créée et chargée avec des exemples de données. Vous utilisez le mssql-python pilote Python pour ...

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This repository provides structured learning materials and runnable SQL scripts for understanding relational databases, writing queries, changing data safely, and improving database performance. It is ...

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