新增文本题库导入功能，题目新增“解析”字段

api/models/question.ts

@@ -8,6 +8,7 @@ export interface Question {
   category: string;
   options?: string[];
   answer: string | string[];
+  analysis: string;
   score: number;
   createdAt: string;
 }
@@ -18,6 +19,7 @@ export interface CreateQuestionData {
   category?: string;
   options?: string[];
   answer: string | string[];
+  analysis?: string;
   score: number;
 }
 
@@ -26,6 +28,7 @@ export interface ExcelQuestionData {
   type: string;
   category?: string;
   answer: string;
+  analysis?: string;
   score: number;
   options?: string[];
 }
@@ -37,13 +40,14 @@ export class QuestionModel {
     const optionsStr = data.options ? JSON.stringify(data.options) : null;
     const answerStr = Array.isArray(data.answer) ? JSON.stringify(data.answer) : data.answer;
     const category = data.category && data.category.trim() ? data.category.trim() : '通用';
+    const analysis = String(data.analysis ?? '').trim().slice(0, 255);
     
     const sql = `
-      INSERT INTO questions (id, content, type, options, answer, score, category) 
-      VALUES (?, ?, ?, ?, ?, ?, ?)
+      INSERT INTO questions (id, content, type, options, answer, analysis, score, category) 
+      VALUES (?, ?, ?, ?, ?, ?, ?, ?)
     `;
     
-    await run(sql, [id, data.content, data.type, optionsStr, answerStr, data.score, category]);
+    await run(sql, [id, data.content, data.type, optionsStr, answerStr, analysis, data.score, category]);
     return this.findById(id) as Promise<Question>;
   }
 
@@ -58,8 +62,8 @@ export class QuestionModel {
       await run('BEGIN TRANSACTION');
       
       const sql = `
-        INSERT INTO questions (id, content, type, options, answer, score, category) 
-        VALUES (?, ?, ?, ?, ?, ?, ?)
+        INSERT INTO questions (id, content, type, options, answer, analysis, score, category) 
+        VALUES (?, ?, ?, ?, ?, ?, ?, ?)
       `;
       
       for (let i = 0; i < questions.length; i++) {
@@ -69,9 +73,10 @@ export class QuestionModel {
           const optionsStr = question.options ? JSON.stringify(question.options) : null;
           const answerStr = Array.isArray(question.answer) ? JSON.stringify(question.answer) : question.answer;
           const category = question.category && question.category.trim() ? question.category.trim() : '通用';
+          const analysis = String(question.analysis ?? '').trim().slice(0, 255);
           
           // 直接执行插入，不调用单个create方法
-          await run(sql, [id, question.content, question.type, optionsStr, answerStr, question.score, category]);
+          await run(sql, [id, question.content, question.type, optionsStr, answerStr, analysis, question.score, category]);
           success++;
         } catch (error: any) {
           errors.push(`第${i + 1}题: ${error.message}`);
@@ -89,6 +94,77 @@ export class QuestionModel {
     return { success, errors };
   }
 
+  static async importFromText(
+    mode: 'overwrite' | 'incremental',
+    questions: CreateQuestionData[],
+  ): Promise<{
+    inserted: number;
+    updated: number;
+    errors: string[];
+    cleared?: { questions: number; quizRecords: number; quizAnswers: number };
+  }> {
+    const errors: string[] = [];
+    let inserted = 0;
+    let updated = 0;
+    let cleared: { questions: number; quizRecords: number; quizAnswers: number } | undefined;
+
+    const insertSql = `
+      INSERT INTO questions (id, content, type, options, answer, analysis, score, category)
+      VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+    `;
+
+    await run('BEGIN TRANSACTION');
+    try {
+      if (mode === 'overwrite') {
+        const [qCount, rCount, aCount] = await Promise.all([
+          get(`SELECT COUNT(*) as total FROM questions`),
+          get(`SELECT COUNT(*) as total FROM quiz_records`),
+          get(`SELECT COUNT(*) as total FROM quiz_answers`),
+        ]);
+        cleared = { questions: qCount.total, quizRecords: rCount.total, quizAnswers: aCount.total };
+
+        await run(`DELETE FROM quiz_answers`);
+        await run(`DELETE FROM quiz_records`);
+        await run(`DELETE FROM questions`);
+      }
+
+      for (let i = 0; i < questions.length; i++) {
+        const question = questions[i];
+        try {
+          const optionsStr = question.options ? JSON.stringify(question.options) : null;
+          const answerStr = Array.isArray(question.answer) ? JSON.stringify(question.answer) : question.answer;
+          const category = question.category && question.category.trim() ? question.category.trim() : '通用';
+          const analysis = String(question.analysis ?? '').trim().slice(0, 255);
+
+          if (mode === 'incremental') {
+            const existing = await get(`SELECT id FROM questions WHERE content = ?`, [question.content]);
+            if (existing?.id) {
+              await run(
+                `UPDATE questions SET content = ?, type = ?, options = ?, answer = ?, analysis = ?, score = ?, category = ? WHERE id = ?`,
+                [question.content, question.type, optionsStr, answerStr, analysis, question.score, category, existing.id],
+              );
+              updated++;
+              continue;
+            }
+          }
+
+          const id = uuidv4();
+          await run(insertSql, [id, question.content, question.type, optionsStr, answerStr, analysis, question.score, category]);
+          inserted++;
+        } catch (error: any) {
+          errors.push(`第${i + 1}题: ${error.message}`);
+        }
+      }
+
+      await run('COMMIT');
+    } catch (error) {
+      await run('ROLLBACK');
+      throw error;
+    }
+
+    return { inserted, updated, errors, cleared };
+  }
+
   // 根据ID查找题目
   static async findById(id: string): Promise<Question | null> {
     const sql = `SELECT * FROM questions WHERE id = ?`;
@@ -219,6 +295,11 @@ export class QuestionModel {
       fields.push('answer = ?');
       values.push(answerStr);
     }
+
+    if (data.analysis !== undefined) {
+      fields.push('analysis = ?');
+      values.push(String(data.analysis ?? '').trim().slice(0, 255));
+    }
     
     if (data.score !== undefined) {
       fields.push('score = ?');
@@ -257,6 +338,7 @@ export class QuestionModel {
       category: row.category || '通用',
       options: row.options ? JSON.parse(row.options) : undefined,
       answer: this.parseAnswer(row.answer, row.type),
+      analysis: String(row.analysis ?? ''),
       score: row.score,
       createdAt: row.created_at
     };
@@ -309,6 +391,10 @@ export class QuestionModel {
     if (data.category !== undefined && data.category.trim().length === 0) {
       errors.push('题目类别不能为空');
     }
+
+    if (data.analysis !== undefined && String(data.analysis).length > 255) {
+      errors.push('解析长度不能超过255个字符');
+    }
     
     return errors;
   }