本内容遵循CC 4.0 BY-SA版权协议 在 MySQL 中，真正约束字段的是数据类型，但数据类型约束很单一，无法满足复杂的业务需求。比如一个 email 字段要求唯一，或者一个班级名字段不允许为空，这些都需要额外的约束来保证数据的合法性，从业务逻辑角度保证数据的 ...

参数说明： max-active: 20 是经过压测的底线值——某模拟项目X 在 16 核服务器上，当并发用户达 800 时，若 max-active 设为 10，平均响应时间从 120ms 暴涨至 2.3s；设为 20 后稳定在 140ms 内。 test-on-borrow: false 是血泪经验：开启后每借连接都执行 SELECT 1 ，在高并发下反而成为 DB 新瓶颈。

A GUI-based Book Store Management System developed using Python, MySQL, and Tkinter. This project is designed to manage book inventory, handle sales, and store records efficiently using a relational ...

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This version of ASP.NET Core is no longer supported. For more information, see the .NET and .NET Core Support Policy. For the current release, see the .NET 10 version of this article. App ...

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