fix bug

exam-work-api/src/main/java/cn/com/qmth/examcloud/service/examwork/service/ExamService.java

@@ -24,6 +24,9 @@ public class ExamService {
     @Autowired
     ExamRepo examRepo;
 
+    @Autowired
+    ExamStudentService examStudentService;
+
     /**
      * 获取所有考试批次(分页)
      * @param examCriteria
@@ -73,10 +76,11 @@ public class ExamService {
      * @param ids
      * @return
      */
-    public void deleteExam(List<Long> ids){
+    public void deleteExam(List<Long> ids)throws Exception{
         List<Exam> exams = examRepo.findByIdIn(ids);
         for(Exam exam:exams){
             if(exam.getCanStuDel()){
+                examStudentService.deleteExamStudents(exam.getId());
                 examRepo.delete(exam);
             }else{
                 throw new RuntimeException(exam.getName()+"批次已经开始,不能删除");