public Collection<CloudVO> searchFile(int memberId, String fileType, String fileName) {
   Collection<CloudVO> result = null;
   if (fileName != null && fileName.trim().length() != 0) {
     if (fileType != null && fileType.trim().length() != 0) {
       result = dao.selectByFileNameAndFileType(memberId, fileType, fileName);
     }
   }
   return result;
 }