not all Blob images shows in jpanel

Question

I inserted 3 blob (images) in derby blob column….One blob first time, then other entry inserted 2 blobs ...the blobs inserted in one row .

blob.getLength() ,gives me the exact bytes size of the 3 blob( images) combined, which suggests to me that the 3 blobs have been saved in DB.

Then I try get :

byteArray = blob.getBytes(0,blob.length());
imageIcon=new ImageIcon(byteArray);

Or

inputStream =blob.getBinaryStream();
BufferedImage image=ImageIO.read(inputStream);
imageIcon= new ImageIcon(image);

whichever I use , I get only the first blob (image) shows on the Jpanel… what blocks the other blobs from being read and show ?

private JTextPane createMediaArea() {
    String getMediaEditorData = "select mediaEditor from settingsTable where id=6";
    Statement stmtBlob;
    try {
        stmtBlob = settingsConn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
        try (ResultSet rsMediaEditor = stmtBlob.executeQuery(getMediaEditorData)) {
            System.out.println("rsMediaEditor is created ");

            while (rsMediaEditor.next()) {
                mediaEditorBlob = rsMediaEditor.getBlob("mediaEditor");
                if (mediaEditorBlob == null) {
                    chosenImageIcon = new ImageIcon("./resources.jpg");
                    scaledChosenImage = chosenImageIcon.getImage().getScaledInstance(100, 100, Image.SCALE_FAST);
                    scaledImageIcon = new ImageIcon(scaledChosenImage);
                    mediaArea.insertIcon(scaledImageIcon);
                } else {
                    mediaEditorBlobLength = mediaEditorBlob.length();
                    System.out.println("mediaEditorBlobLength is : " + mediaEditorBlobLength);
                    /*1st way is to get the blob array .*/
                    /*
                    byte[] mediaEditorByteArray = mediaEditorBlob.getBytes(1L, (int) mediaEditorBlobLength);
                    int mediaEditorByteArrayLength = mediaEditorByteArray.length;
                    System.out.println("mediaEditorByteArrayLength is :" + mediaEditorByteArrayLength);
                    */


                    /*2nd way ..use ImageIO*/
                    InputStream binaryStream = mediaEditorBlob.getBinaryStream();
                    BufferedImage read = ImageIO.read(binaryStream);

                    chosenImageIcon= new ImageIcon(read);

                    scaledChosenImage = chosenImageIcon.getImage().getScaledInstance(100, 100, Image.SCALE_FAST);

                    scaledImageIcon = new ImageIcon(scaledChosenImage);

                    mediaArea.insertIcon(scaledImageIcon);

                }
            }
        } catch (IOException ex) {
            Logger.getLogger(FrontFace.class.getName()).log(Level.SEVERE, null, ex);
        }
        System.out.println("rsMediaEditor closed !");
        stmtBlob.close();
        System.out.println("stmtBlob closed !");
    } catch (SQLException ex) {
        Logger.getLogger(FrontFace.class.getName()).log(Level.SEVERE, null, ex);
    }
    return mediaArea;
}

Answer 1

In java we use jdbc to interact with databases. See here for examples https://docs.oracle.com/javase/tutorial/jdbc/.

And jdbc is used to retrieve database rows into java objects.