Question

您好我正在尝试更新JTable中的特定单元格。我正在预订，一旦选定的预订被批准，它将从否改为是。但是，单击Approve后，ReservationStatus中的所有列都已从No更改为Yes，尽管我只想更改特定单元格（例如，第0行第6列）。这是我的Jtable代码：

table = new JTable(){
        public boolean isCellEditable(int row, int col) {
            return false;
        };
    };
    table.getTableHeader().setReorderingAllowed(false);
    table.addMouseListener(new MouseAdapter() {
        @Override
        public void mouseClicked(MouseEvent e) {
            row = table.rowAtPoint(e.getPoint());
            col = table.columnAtPoint(e.getPoint());
            data = table.getValueAt(row, col);
            System.out.println("Row= " + row + "column =" + col + "Data= " + data);
            DefaultTableModel model = (DefaultTableModel)table.getModel();
            int selectedRowIndex = table.getSelectedRow();
            if(e.getClickCount() == 2) {
                if(col == 6){
                    frame.setContentPane(new approvalReservation(frame));
                    approvalReservation.lblDisplayAdminNo.setText(model.getValueAt(selectedRowIndex, 0).toString());
                    approvalReservation.lblDisplayMusicalInstrument.setText(model.getValueAt(selectedRowIndex, 1).toString());
                    approvalReservation.lblDisplayDuration.setText(model.getValueAt(selectedRowIndex, 2).toString());
                    approvalReservation.lblDisplayExtension.setText(model.getValueAt(selectedRowIndex, 5).toString());
                }
                else if(col == 7) {
                    frame.setContentPane(new approvalAccess(frame));
                    approvalAccess.lblDisplayAdminNo.setText(model.getValueAt(selectedRowIndex, 0).toString());
                    approvalAccess.lblDisplayLockerNumber.setText(model.getValueAt(selectedRowIndex, 3).toString());
                    approvalAccess.lblDisplayLocation.setText(model.getValueAt(selectedRowIndex, 4).toString());
                }

            }
        }
    });


    scrollPane.setViewportView(table);

    JButton btnLoadTable = new JButton("Load Table");
    btnLoadTable.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            approvalController ac = new approvalController();
            ArrayList<String> approvalList = approvalController.displayTableReservation();
            for(int i = 0; i < approvalList.size(); i++) {
                approvalList.get(i);
            }

        }
    });

PS：我将row和col声明为public static，因此两者都可以传递给另一个JPanel。

这是批准表格代码：

JButton btnApprove = new JButton("Approve");
    btnApprove.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            Connection connection=null;
            connection = sqliteConnection.dbConnector();
            try {
                String query = "Update approval set reservationStatus = 'Yes' where reservationStatus = '" + approvalMain.data + "'";
                PreparedStatement pst = connection.prepareStatement(query);
                pst.executeUpdate();
                System.out.println("Updated");
                JOptionPane.showMessageDialog(null, "Data Updated");


            }

            catch(Exception e) {
                e.printStackTrace();
            }
        }
    });
    btnApprove.setBackground(SystemColor.info);
    btnApprove.setBounds(650, 361, 135, 50);
    panel.add(btnApprove);

另一个问题是，当ReservationStatus为＆＃34; No＆＃34;时，用户无法点击下一列AccessStatus。由于AccessStatus仅在ReservationStatus被批准后可以点击，因此从No到Yes。我该怎么做呢？到目前为止，可以单击列中的两个单元格。

JTable Before Approving

After clicking on Approve, note that all the cells in ReservationStatus has been changed from No to Yes

Answer 1

String query = "Update approval set reservationStatus = 'Yes' where reservationStatus = '" + approvalMain.data + "'";

假设approvalMain.data等于'No'，此查询会说明更新当前状态为'No'的每一行的状态。如果您只想更改一行，则需要在where子句中指定它，最好使用表格的主键列。

从SQL

1 个答案: