使用java&；更新图像；SQL

图像的更新工作正常，但是当我对记录进行部分更新时，例如，我更新“Name，City，Zipecode”，而不更新图像。我收到了成功保存的消息，但当搜索更新的记录时，我发现图像变为“空”

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所以，问题是当你做“部分更新”时。但是发布的代码没有做任何部分更新。这似乎与图像和DBs有关，但与Swing无关！您能否从控制台应用程序成功“更新图像”。？如果是这样的话，这可能与Swing有关。如果没有，那就没有了。如果你还没有尝试过，你应该这样做。为了更快地获得更好的帮助，请发布一个or。如果我更新了包括图像在内的所有内容，就没有问题了。但是如果我更新了除图像以外的所有内容。然后问题是图像被替换为“空”并且不再显示？？我修复了它，谢谢

    private void UpdateEmplyee() throws Exception {
        try {

            int EMP_ID = Integer.parseInt(this.empidtxt.getText());

            String FNAME = this.firstnametxt.getText().toUpperCase();
            String LNAME = this.lastnametxt.getText().toUpperCase();
            String ADDRESS = this.addresstxt.getText().toUpperCase();
            String CITY = this.citytxt.getText().toUpperCase();
            String STATE = this.statetxt.getText().toUpperCase();
            int ZCODE = Integer.parseInt(this.zipcodetxt.getText());
            String PHONE_N = this.phonetxt.getText();

            //I need something here to keep the image as it is, if not updated??
            //Icon image = this.AttImglbl.getIcon();


            EmployeeRecord emp = new EmployeeRecord();

            emp.setFNAME(FNAME);
            emp.setLNAME(LNAME);
            emp.setADDRESS(ADDRESS);
            emp.setADDRESS(ADDRESS);
            emp.setCITY(CITY);
            emp.setSTATE(STATE);
            emp.setZCODE(ZCODE);
            emp.setPHONE_N(PHONE_N);
            emp.setEMP_IMG(EMP_IMG);//byte[]

            EmployeeRecordDao empdao = new EmployeeRecordDao();

            int result = empdao.UpdateEmployee(emp, EMP_ID);

            if (result != 0) {
                dm.Message("Your data has been saved!");
            } else {
                dm.Message("Your data has been rejected!");
            }

        } catch (SQLException e) {
            System.out.println(e.toString());
            dm.Message("An error has occurred. Please try again");
        }

        empidtxt.requestFocus();

    }

private void AttachImage() {
        try {
            JFileChooser chooser = new JFileChooser();
            chooser.showOpenDialog(attachmentbtn.getParent());
            File f = chooser.getSelectedFile();
            filename = f.getAbsolutePath();
            Image img;
            img = getToolkit().createImage(filename);
            ImageIcon ii = new ImageIcon(img.getScaledInstance(200, 200, Image.SCALE_SMOOTH));
            AttImglbl.setIcon(ii);

            File image = new File(filename);
            FileInputStream fis = new FileInputStream(image);
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            byte[] buf = new byte[1024];
            for (int readNum; (readNum = fis.read(buf)) != -1;) {
                bos.write(buf, 0, readNum);
            }

            EMP_IMG = bos.toByteArray();
        } catch (HeadlessException | IOException e) {
            System.out.println(e.toString());
        }

    }