解决mybatis 不支持乐观锁

mec-biz/src/main/java/com/ym/mec/biz/service/impl/StudentRegistrationServiceImpl.java

@@ -777,7 +777,10 @@ public class StudentRegistrationServiceImpl extends BaseServiceImpl<Long, Studen
         //减去缴费人数
         if (studentPaymentOrder.getStatus().equals(DealStatusEnum.FAILED)) {
             musicOneSubjectClassPlan.setPaidStudentNum(musicOneSubjectClassPlan.getPaidStudentNum() - 1);
-            musicGroupSubjectPlanService.update(musicOneSubjectClassPlan);
+            int updateCount = musicGroupSubjectPlanService.update(musicOneSubjectClassPlan);
+            if(updateCount <= 0){
+                throw new BizException("减去缴费人数失败");
+            }
             //发送缴费成功通知（短信 + push）
             String studentApplyUrl = sysConfigDao.findConfigValue(SysConfigService.STUDENT_APPLY_URL + studentRegistration.getMusicGroupId());