sql修改

src/main/java/com/project/exam/mapper/ExamRecordMapper.java

@@ -13,7 +13,7 @@ public interface ExamRecordMapper extends BaseMapper<ExamRecordEntity> {
      * SQL 解释：$[index].userAnswer 对应 JSON 数组中第 index 个对象的字段
      */
     @Update("UPDATE evaluator_exam_record SET " +
-            "answer_snapshot = JSON_SET(paper_snapshot, '$[${idx}].userAnswer', #{answer}), " +
+            "answer_snapshot = JSON_SET(answer_snapshot, '$[${idx}].userAnswer', #{answer}), " +
             "update_time = NOW() " +
             "WHERE id = #{recordId}")
     int updateAnswerIncremental(@Param("recordId") Long recordId,