后台基本功能完成，待完善：普通用户前端页面

api/controllers/questionCategoryController.ts

@@ -4,7 +4,7 @@ import { QuestionCategoryModel } from '../models/questionCategory';
 export class QuestionCategoryController {
   static async getCategories(req: Request, res: Response) {
     try {
-      const categories = await QuestionCategoryModel.findAll();
+      const categories = await QuestionCategoryModel.findAllWithQuestionCounts();
       res.json({
         success: true,
         data: categories

api/models/questionCategory.ts

@@ -7,6 +7,10 @@ export interface QuestionCategory {
   createdAt: string;
 }
 
+export interface QuestionCategoryWithQuestionCount extends QuestionCategory {
+  questionCount: number;
+}
+
 export class QuestionCategoryModel {
   // 获取所有题目类别，包括从题目表中聚合的新类别
   static async findAll(): Promise<QuestionCategory[]> {
@@ -125,4 +129,32 @@ export class QuestionCategoryModel {
     await run(`UPDATE questions SET category = '通用' WHERE category = ?`, [existing.name]);
     await run(`DELETE FROM question_categories WHERE id = ?`, [id]);
   }
+
+  static async findAllWithQuestionCounts(): Promise<QuestionCategoryWithQuestionCount[]> {
+    const categories = await this.findAll();
+
+    try {
+      const countSql = `
+        SELECT
+          COALESCE(NULLIF(TRIM(category), ''), '通用') as name,
+          COUNT(*) as questionCount
+        FROM questions
+        GROUP BY COALESCE(NULLIF(TRIM(category), ''), '通用')
+      `;
+      const rows: Array<{ name: string; questionCount: number }> = await query(countSql);
+      const countByName = new Map<string, number>(
+        rows.map((r) => [String(r.name), Number(r.questionCount ?? 0)]),
+      );
+
+      return categories.map((c) => ({
+        ...c,
+        questionCount: countByName.get(c.name) ?? 0,
+      }));
+    } catch {
+      return categories.map((c) => ({
+        ...c,
+        questionCount: 0,
+      }));
+    }
+  }
 }