修复 MySQL 数据库兼容性问题 - strftime 函数

backend/db.js

@@ -5,6 +5,7 @@ const DB_TYPE = process.env.DB_TYPE || 'sqlite'; // 数据库类型：sqlite 或
 
 // 根据数据库类型创建连接
 let sequelize;
+let dbDialect = 'sqlite'; // 实际使用的数据库类型
 
 if (DB_TYPE === 'mysql') {
   // MySQL 配置
@@ -19,6 +20,7 @@ if (DB_TYPE === 'mysql') {
       logging: process.env.NODE_ENV === 'development' ? console.log : false
     }
   );
+  dbDialect = 'mysql';
 } else {
   // SQLite 配置（默认）
   sequelize = new Sequelize({
@@ -28,7 +30,8 @@ if (DB_TYPE === 'mysql') {
     dialectOptions: {
       charset: 'utf8mb4'
     }
-  });
+  );
+  dbDialect = 'sqlite';
 }
 
-module.exports = { sequelize, DB_TYPE };
+module.exports = { sequelize, DB_TYPE, dbDialect };

backend/routes/tickets.js

@@ -5,7 +5,7 @@ const { v4: uuidv4 } = require('uuid');
 const { Ticket, TicketOperationRecord } = require('../models/ticketIndex');
 const Device = require('../models/Device');
 const User = require('../models/User');
-const { DB_TYPE } = require('../db');
+const { dbDialect } = require('../db');
 
 // 获取工单统计 (必须定义在 /:ticketId 之前)
 router.get('/stats', async (req, res) => {
@@ -51,7 +51,7 @@ router.get('/stats', async (req, res) => {
     const monthlyStats = await Ticket.findAll({
       where,
       attributes: [
-        [DB_TYPE === 'mysql' 
+        [dbDialect === 'mysql' 
           ? require('sequelize').fn('DATE_FORMAT', require('sequelize').col('createdAt'), '%Y-%m')
           : require('sequelize').fn('strftime', '%Y-%m', require('sequelize').col('createdAt')), 
           'month'],