如何将JTable中的数据保存到数据库？

Question

目前我创建了一个导入 Excel 文件 function，这是我的代码：

    private void fromExcelMouseClicked(java.awt.event.MouseEvent evt) {                                       

        File excelFile;
        FileInputStream excelFIS = null;
        BufferedInputStream excelBIS = null;
        XSSFWorkbook excelJTableImport = null;

        DefaultTableModel model =  (DefaultTableModel) tabelsatuan.getModel();

        String defaultCurrentDirectoryPath = "";
        JFileChooser excelFileChooser = new JFileChooser(defaultCurrentDirectoryPath);

        FileNameExtensionFilter fnef = new FileNameExtensionFilter("EXCEL FILES","xls","xlsx","xlsm");
        excelFileChooser.setFileFilter(fnef);
        excelFileChooser.setDialogTitle("Select Excel File");
        int excelChooser =  excelFileChooser.showOpenDialog(null);

        if (excelChooser == JFileChooser.APPROVE_OPTION){
            try{
            excelFile = excelFileChooser.getSelectedFile();
            excelFIS = new FileInputStream(excelFile);
            excelBIS = new BufferedInputStream(excelFIS);
            excelJTableImport = new XSSFWorkbook(excelBIS);
            XSSFSheet excelSheet = excelJTableImport.getSheetAt(0);

            for (int row = 0; row < excelSheet.getLastRowNum(); row++ ){
               XSSFRow excelRow = excelSheet.getRow(row); 

               XSSFCell excelNomor = excelRow.getCell(0);
               XSSFCell excelKode = excelRow.getCell(1);
               XSSFCell excelNama = excelRow.getCell(2);
               XSSFCell excelKeterangan = excelRow.getCell(3);


               model.addRow(new Object[] {excelNomor,excelKode,excelNama,excelKeterangan});

            }
                JOptionPane.showMessageDialog(null, "Imported Successfully");
            } catch (FileNotFoundException ex){
                JOptionPane.showMessageDialog(null, ex.getMessage());
            } catch (IOException ex) {
                JOptionPane.showMessageDialog(null, ex.getMessage());
            }finally {
                try{
                if(excelFIS != null){
                    excelFIS.close();
                }
                if(excelBIS != null){
                    excelBIS.close();
                }
                if(excelJTableImport != null){
                   excelJTableImport.close();
                }
                }catch(IOException ex){
                    JOptionPane.showMessageDialog(null, ex.getMessage());
                }
            }
        }
    }               

但是，它只显示表上的数据而没有实际将其保存到数据库中，所以当我关闭它时，导入的数据全部消失了。 我尝试使用以下代码制作保存到数据库按钮：

DefaultTableModel model = (DefaultTableModel) tabelsatuan.getModel();
        try{
            Statement st;
            st = con.createStatement();
            for(int x=0; x<model.getRowCount();x++){
                st.executeUpdate("update satuan set kode='"+model.getValueAt(x, 1)+"',nama='"+model.getValueAt(x, 2)+"',keterangan='"+model.getValueAt(x, 3)+"' where nomor="+model.getValueAt(x,0));
            }
            JOptionPane.showMessageDialog(rootPane,"Saved");
        }catch(Exception e){
            JOptionPane.showMessageDialog(null, e);
        }

但它不起作用。 如何将JTable中的数据保存到数据库？