跨团合班

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

@@ -1597,4 +1597,18 @@ public class StudentRegistrationServiceImpl extends BaseServiceImpl<Long, Studen
 	public List<StudentMusicGroupDto> queryStudentMusicGroupInfo(Integer userId) {
 		return studentRegistrationDao.queryStudentMusicGroupInfo(userId);
 	}
+
+    @Override
+    @Transactional(rollbackFor = Exception.class)
+    public Boolean delReg(Long id) {
+        StudentRegistration studentRegistration = studentRegistrationDao.get(id);
+        MusicGroupSubjectPlan subjectPlan = musicGroupSubjectPlanDao.findSubjectPlan(studentRegistration.getMusicGroupId(), studentRegistration.getSubjectId());
+        int delNum = studentRegistrationDao.delete(id);
+        subjectPlan.setApplyStudentNum(subjectPlan.getApplyStudentNum() - 1);
+        int updateNum = musicGroupSubjectPlanDao.update(subjectPlan);
+        if (delNum <= 0 || updateNum <= 0) {
+            throw new BizException("删除失败，请重试");
+        }
+        return true;
+    }
 }