feat: 实现成绩管理系统核心功能

添加响应工具、错误处理中间件和数据库模型
创建用户、学生、课程和成绩相关服务
实现管理员、教师和学生控制器的基本功能
重构路由处理并优化数据库查询

backend/routes/student.js

@@ -1,143 +1,9 @@
 const express = require('express');
 const router = express.Router();
-const db = require('../config/database');
+const StudentController = require('../controllers/studentController');
 const { requireAuth, requireRole } = require('../middleware/auth');
 
-// 获取学生成绩
-router.get('/grades', requireAuth, requireRole(['student']), async (req, res) => {
-    try {
-        const userId = req.session.user.id;
-        
-        // 获取学生信息
-        const students = await db.pool.execute(
-            'SELECT id FROM students WHERE user_id = ?',
-            [userId]
-        );
-        
-        if (students[0].length === 0) {
-            return res.status(404).json({ 
-                success: false, 
-                message: '学生信息不存在' 
-            });
-        }
-        
-        const studentId = students[0][0].id;
-        
-        // 获取成绩信息
-        const grades = await db.pool.execute(`
-            SELECT s.*, c.course_code, c.course_name, c.credit,
-                   u.name as teacher_name
-            FROM scores s
-            JOIN courses c ON s.course_id = c.id
-            JOIN users u ON s.teacher_id = u.id
-            WHERE s.student_id = ?
-            ORDER BY s.exam_date DESC
-        `, [studentId]);
-        
-        // 计算统计信息
-        let totalCredits = 0;
-        let totalGradePoints = 0;
-        let totalCourses = grades.length;
-        
-        grades.forEach(grade => {
-            totalCredits += parseFloat(grade.credit);
-            if (grade.grade_point) {
-                totalGradePoints += parseFloat(grade.grade_point) * parseFloat(grade.credit);
-            }
-        });
-        
-        const gpa = totalCredits > 0 ? (totalGradePoints / totalCredits).toFixed(2) : 0;
-        
-        res.json({
-            success: true,
-            grades,
-            statistics: {
-                totalCourses,
-                totalCredits,
-                gpa,
-                averageScore: totalCourses > 0 ? 
-                    (grades.reduce((sum, g) => sum + parseFloat(g.score || 0), 0) / totalCourses).toFixed(1) : 0
-            }
-        });
-        
-    } catch (error) {
-        console.error('获取成绩错误:', error);
-        res.status(500).json({ 
-            success: false, 
-            message: '服务器错误' 
-        });
-    }
-});
-
-// 获取成绩详情
-router.get('/grades/:id', requireAuth, requireRole(['student']), async (req, res) => {
-    try {
-        const gradeId = req.params.id;
-        const userId = req.session.user.id;
-        
-        const grades = await db.pool.execute(`
-            SELECT s.*, c.course_code, c.course_name, c.credit, c.semester,
-                   u.full_name as teacher_name, u.email as teacher_email,
-                   st.student_id as student_number, st.class_name, st.major
-            FROM scores s
-            JOIN courses c ON s.course_id = c.id
-            JOIN users u ON s.teacher_id = u.id
-            JOIN students st ON s.student_id = st.id
-            WHERE s.id = ? AND st.user_id = ?
-        `, [gradeId, userId]);
-        
-        if (grades[0].length === 0) {
-            return res.status(404).json({ 
-                success: false, 
-                message: '成绩不存在' 
-            });
-        }
-        
-        res.json({
-            success: true,
-            grade: grades[0]
-        });
-        
-    } catch (error) {
-        console.error('获取成绩详情错误:', error);
-        res.status(500).json({ 
-            success: false, 
-            message: '服务器错误' 
-        });
-    }
-});
-
-// 获取学生个人信息
-router.get('/profile', requireAuth, requireRole(['student']), async (req, res) => {
-    try {
-        const userId = req.session.user.id;
-        
-        const students = await db.pool.execute(`
-            SELECT s.*, u.username, u.email, u.created_at as account_created
-            FROM students s
-            JOIN users u ON s.user_id = u.id
-            WHERE u.id = ?
-        `, [userId]);
-        
-        if (students[0].length === 0) {
-            return res.status(404).json({ 
-                success: false, 
-                message: '学生信息不存在' 
-            });
-        }
-        
-        res.json({
-            success: true,
-            profile: students[0]
-        });
-        
-    } catch (error) {
-        console.error('获取个人信息错误:', error);
-        res.status(500).json({ 
-            success: false, 
-            message: '服务器错误' 
-        });
-    }
-});
+router.get('/grades', requireAuth, requireRole(['student']), StudentController.getGrades);
+router.get('/grades/:id', requireAuth, requireRole(['student']), StudentController.getGradeDetails);
 
 module.exports = router;