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const pool = require('../db');
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const ExcelJS = require('exceljs');
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async function updateScore(req, res) {
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const { student_id, points } = req.body;
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let connection; // 在try块外部声明connection
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try {
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connection = await pool.getConnection();
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// 更新学生的积分并增加点名次数
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const [result] = await connection.query(
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'UPDATE students SET score = score + ?, call_count = call_count + 1 WHERE student_id = ?',
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[points, student_id]
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);
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if (result.affectedRows > 0) {
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// 查询更新后的分数
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const [rows] = await connection.query(
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'SELECT score FROM students WHERE student_id = ?',
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[student_id]
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);
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if (rows.length > 0) {
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const updatedScore = rows[0].score;
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return res.send(String(updatedScore));
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} else {
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return res.status(404).send('学生不存在');
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}
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} else {
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return res.status(404).send('学生不存在');
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}
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} catch (error) {
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console.error('数据库操作失败:', error);
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return res.status(500).send('更新积分失败');
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} finally {
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if (connection) {
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connection.release(); // 只有在connection已被赋值时才调用release
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}
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}
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}
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async function getStudentScore(req, res) {
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const { student_id } = req.body;
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let connection;
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try {
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connection = await pool.getConnection();
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// 查询指定学生的分数
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const [rows] = await connection.query(
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'SELECT score FROM students WHERE student_id =?',
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[student_id]
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);
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if (rows.length > 0) {
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const score = rows[0].score;
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// 修改这里，构建包含student_id和score的对象并返回
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return res.json({ student_id, score });
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} else {
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return res.status(404).json({ message: '学生不存在' });
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}
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} catch (error) {
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console.error('数据库操作失败:', error);
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return res.status(500).json({ error: '获取分数失败' });
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} finally {
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if (connection) {
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connection.release();
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}
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}
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}
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async function exportScores(req, res) {
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let connection;
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try {
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connection = await pool.getConnection();
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// 查询学生的成绩
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const [rows] = await connection.query('SELECT student_name, student_id, score FROM students');
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// 创建一个工作簿和一个工作表
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const workbook = new ExcelJS.Workbook();
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const worksheet = workbook.addWorksheet('Scores');
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// 添加列标题
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worksheet.columns = [
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{ header: 'Student Name', key: 'student_name', width: 20 },
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{ header: 'Student ID', key: 'student_id', width: 15 },
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{ header: 'Score', key: 'score', width: 10 },
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];
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// 将数据添加到工作表中
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rows.forEach(row => {
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worksheet.addRow(row);
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});
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// 设置响应头，告知浏览器以附件形式下载文件
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res.setHeader('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
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res.setHeader('Content-Disposition', 'attachment; filename=scores.xlsx');
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// 生成并发送 Excel 文件
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await workbook.xlsx.write(res);
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res.end();
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} catch (error) {
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console.error('导出成绩失败:', error);
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res.status(500).send({ error: '无法导出成绩' });
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} finally {
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if (connection) connection.release();
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}
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}
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module.exports = { updateScore, getStudentScore,exportScores }; |
