fix：修复bug

server-service/src/main/java/com/makeit/service/platform/elder/impl/PlatElderServiceImpl.java

@@ -635,11 +635,11 @@ public class PlatElderServiceImpl extends ServiceImpl<PlatElderMapper, PlatElder
         if (configVO.isPresent()) {
             type = configVO.get().getValue();
         }
-        PlatElder old = getOne(new QueryWrapper<PlatElder>().lambda()
-                .eq(StringUtils.isNotEmpty(type),PlatElder::getCertificateType, type)
+        long count = count(new QueryWrapper<PlatElder>().lambda()
+                .eq(StringUtils.isNotEmpty(type), PlatElder::getCertificateType, type)
                 .eq(PlatElder::getCertificateNumber, dto.getCertificateNumber())
         );
-        return true;
+        return count > 0;
     }
 
     private void check(PlatElderAddDTO dto) {