try{

     Class.forName("com.mysql.jdbc.Driver");
     conectar = (Connection) DriverManager.getConnection("jdbc:mysql://127.0.0.1/proyecto", "root", "");


 }  catch (ClassNotFoundException ex) {
        Logger.getLogger(datos.class.getName()).log(Level.SEVERE, null, ex);
    } catch (SQLException ex) {
        Logger.getLogger(datos.class.getName()).log(Level.SEVERE, null, ex);
    }
 try{
 String sql= "UPDATE datos SET Nombre=?,"+ "Apellido=?,"+ "Email=?,"+"Foto=?,"+"Ruta=?,"+"Posicion=?,"+"Compañia=?,"+"Nota=?,"+"Telefono=?" +"WHERE Nombre='"+jTextField1.getText()+"'";

 PreparedStatement pst= conectar.prepareStatement(sql);

        pst.setString(1, jTextField1.getText());
        pst.setString(2, jTextField2.getText());
        pst.setString(3, jTextField3.getText());
        pst.setString(4, jTextField4.getText());
        pst.setString(5, jTextField5.getText());
        pst.setString(6, jTextField6.getText());
        pst.setString(7, jTextField8.getText());
        FileInputStream ArchivosFoto;
        FileInputStream Archivofoto = new FileInputStream(jTextField7.getText());
        pst.setBinaryStream(8, Archivofoto);
        pst.setString(9, jTextField7.getText());
        int n = pst.executeUpdate();
        if (n > 0) {
            JOptionPane.showMessageDialog(null, "Se modificaron los datos de manera correcta :D");
            tablaDatos();

        } else {

            JOptionPane.showMessageDialog(null, "Ocurrio un error, no se pudo modificar los datos :c");

        }
 }  catch (SQLException ex) {
        Logger.getLogger(datos.class.getName()).log(Level.SEVERE, null, ex);
    } catch (FileNotFoundException ex) {
        Logger.getLogger(datos.class.getName()).log(Level.SEVERE, null, ex);
    }
}