2.1 JDK 与 eclipse 的版本匹配：环境变量配置先走一遍 安装 eclipse 之前，最容易出错的步骤是 JDK 版本没选对。典型场景是：电脑里装过多个 JDK，命令行下 java -version 显示的还是老版本，而 eclipse 里配置的 JRE 又指向另一个路径，编译时就会冒出各种 validate 错误。

本内容遵循CC 4.0 BY-SA版权协议 简介：面向Java初学者与课程设计学生，这份学生信息管理系统项目基于Eclipse+MySQL开发，实现登录注册，并按管理员、学生、教师三种身份划分权限。管理员和教师可对学生信息及成绩进行增删改查，学生仅可查询，角色边界清晰 ...

使用适用于 SQL Server 的 Microsoft Java 数据库连接 (JDBC) 驱动程序，将 Java 应用程序连接到 SQL Server、Azure SQL 数据库 或 Fabric 中的 SQL 数据库。 该快速入门使用Maven下载依赖，读取环境变量中的连接设置，并验证参数化查询结果。 你不需要AdventureWorks或任何示例表。

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