Java Desktop with Mysql Bank

I'm trying to write an image to the MySql database, the table is just below, the code to load the image is right after that, I'm using a button to load a JLabel, after that I use another button to insert the image image in the database, just below the insert code, I can not write to the database.

Mysql Bank

create table imagens(
id int not null auto_increment,
cpf varchar(15) not null,
foto blob null,
primary key (id),
foreign key (cpf)
references funcionario(cpf)
ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB; 

Here and where I load the image in JLabel from a JFileChooser

JFileChooser fileChooser = new JFileChooser();   //Cria o objeto do tipo Janela JFileChooser
        fileChooser.setDialogTitle("Escolha a Foto");  //Define o título do JFileChooser
        fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);  //Define que só serão abertos arquivos
        {
            if (fileChooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {
                try {
                    File arquivo = fileChooser.getSelectedFile();//arquivo
                    BufferedImage bi = ImageIO.read(arquivo); //carrega a imagem real num buffer
                    BufferedImage aux = new BufferedImage(100, 80, bi.getType());//cria um buffer auxiliar com o tamanho desejado
                    Graphics2D g = aux.createGraphics();//pega a classe graphics do aux para edicao
                    AffineTransform at = AffineTransform.getScaleInstance((double) 100 / bi.getWidth(), (double) 80 / bi.getHeight());//cria a transformacao
                    g.drawRenderedImage(bi, at);//pinta e transforma a imagem real no auxiliar
                    foto.setIcon(new ImageIcon(aux));//seta no jlabel
                    foto.setText(null);

                   // ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
                    //Jogue a imagem lá dentro do byteArrayOutputStream
                    //ImageIO.write(aux, "png", byteArrayOutputStream);

                }catch (IOException ex) {

                }


            }
    }

This is my insert.

String prep = "INSERT INTO imagens (foto,cpf)  VALUES(?,?)";

Image image = ((ImageIcon)foto.getIcon()).getImage();
PreparedStatement sttmt = con.prepareStatement(prep);
JTextField cpff = cpf;

sttmt.setBytes(1, bytes(image));
sttmt.setString(2, cpf.getText());

sttmt.execute();
sttmt.close();