How to insert and retrieve files in hsqldb

How to save files into hsqldb? How to restore them back?

     String calibrationZip = "calibrazione.zip";
     String newcalibrationZip = "new_calibrazione.zip";
      String insertStr = "INSERT INTO CALIBRAZIONE_BLOB (ID, DATA) VALUES (##, ?)"
     String sql = "select data as DATA from CALIBRAZIONE_BLOB where id = ##"
      int runId = 1;


     /*
      * insert into blob
      */
     FileInputStream fis = null;
     PreparedStatement st = null;
     try {
         File fl = new File(calibrationZip);
         fis = new FileInputStream(fl);
         insertStr = insertStr.replaceFirst("##", String.valueOf(runId));
         st = con.prepareStatement(insertStr);
         st.setBinaryStream(1, fis, (int) fl.length());
         st.executeUpdate();
     } catch (Exception ex) {
         System.out.println(ex);
     } finally {
         try {
             if (null != st)
                 st.close();
         } catch (Exception ex) {
         }
         try {
             if (null != fis)
                 fis.close();
         } catch (Exception ex) {
         }
     }

     /*
      * extract the blob
      */
     sql = sql.replaceFirst("##", String.valueOf(runId));
     try {
         Statement statement = con.createStatement();
         ResultSet rs = statement.executeQuery(sql);
         if (rs.next()) {
             InputStream is = rs.getBinaryStream("DATA");
             FileOutputStream fos = new FileOutputStream(newcalibrationZip);
             byte[] buff = new byte[8192];
             int len;
             while( 0 < (len = is.read(buff)) )
                 fos.write(buff, 0, len);
             fos.close();
             is.close();
         }
         rs.close();
         statement.close();
     } catch (FileNotFoundException e) {
         e.printStackTrace();
     } catch (SQLException e) {
         e.printStackTrace();
     } catch (IOException e) {
         e.printStackTrace();
     }