原创，连接MySQL数据库的学生成绩管理系统，基本无BUG，三个用户类型，实现了更改密码，录入查询成绩，增删改查课程，增删改查学生-Original student achievement, to connect to the MySQL database management system, the basic non-BUG, three user types, and change your password, input query results, CRUD course CRUD s

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