在 SQL 中从 Jtable 更新特定单元格

Question

您好，我正在尝试更新我的 JTable 中的特定单元格。我正在做一个预订，一旦选定的预订获得批准，它就会从“否”更改为“是”。但是，在单击“批准”后，ReservationStatus 中的所有列都已从“否”更改为“是”，尽管我只想更改特定的单元格（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。

这是审批表代码：

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 "No" 时，用户无法单击下一列 AccessStatus。由于 AccessStatus 只有在 ReservationStatus 被批准后才能点击，从 No 到 Yes。我该怎么做？截至目前，可以单击列内的两个单元格。

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'，此查询表示要更新当前状态为 '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 table.

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在 SQL 中从 Jtable 更新特定单元格

Update specific Cell from Jtable in SQL

java

sql

swing

jtable