增加说明文件

readme.md

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+MySQL中创建数据库和表：
+
+sql
+-- 创建数据库
+CREATE DATABASE campus_attendance DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+USE campus_attendance;
+
+-- 创建学生表
+CREATE TABLE student (
+id INT PRIMARY KEY AUTO_INCREMENT,
+name VARCHAR(50) NOT NULL,
+student_id VARCHAR(20) NOT NULL UNIQUE,
+class VARCHAR(50),
+major VARCHAR(100)
+);
+
+-- 创建用户表
+CREATE TABLE user (
+id INT PRIMARY KEY AUTO_INCREMENT,
+username VARCHAR(50) NOT NULL UNIQUE,
+password VARCHAR(100) NOT NULL,
+role VARCHAR(20) NOT NULL
+);
+
+-- 插入测试数据
+INSERT INTO student (name, student_id, class, major) VALUES
+('张三', '2023001', '计算机1班', '计算机科学与技术'),
+('李四', '2023002', '软件1班', '软件工程');
+
+INSERT INTO user (username, password, role) VALUES
+('admin', 'admin123', 'ADMIN'),
+('teacher1', 'teacher123', 'TEACHER');
+
+
+![img.png](img.png)