first commit

backend/config/database.js

@@ -0,0 +1,64 @@
+const mysql = require('mysql2/promise');
+require('dotenv').config();
+
+const pool = mysql.createPool({
+  host: process.env.DB_HOST || 'localhost',
+  user: process.env.DB_USER || 'root',
+  password: process.env.DB_PASSWORD || '123456',
+  database: process.env.DB_NAME || 'score_management',
+  waitForConnections: true,
+  connectionLimit: 10,
+  queueLimit: 0
+});
+
+// 测试数据库连接
+async function testConnection() {
+  try {
+    const connection = await pool.getConnection();
+    console.log('数据库连接成功');
+    connection.release();
+    return true;
+  } catch (error) {
+    console.error('数据库连接失败:', error.message);
+    return false;
+  }
+}
+
+// 执行查询
+async function query(sql, params) {
+  try {
+    const [rows] = await pool.execute(sql, params);
+    return rows;
+  } catch (error) {
+    console.error('数据库查询错误:', error.message);
+    throw error;
+  }
+}
+
+// 执行事务
+async function executeTransaction(operations) {
+  const connection = await pool.getConnection();
+  try {
+    await connection.beginTransaction();
+    
+    for (const operation of operations) {
+      await connection.execute(operation.sql, operation.params);
+    }
+    
+    await connection.commit();
+    console.log('事务执行成功');
+  } catch (error) {
+    await connection.rollback();
+    console.error('事务执行失败:', error.message);
+    throw error;
+  } finally {
+    connection.release();
+  }
+}
+
+module.exports = {
+  pool,
+  query,
+  executeTransaction,
+  testConnection
+};