嗨我试图从我的JTable更新特定的单元格。我正在进行预订,一旦所选预订获得批准,它将从“否”更改为“是”。 但是,在点击批准后,ReservationStatus中的所有列都从No更改为Yes,但我只想要更改特定的单元格(例如,第0行第6列)。 这是我对JTable代码:从Jtable中更新特定的单元格在SQL中
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:我宣布ROW和COL作为公共静态的,所以两者都可以传递到另一个JPanel的。
而这是审批表代码:
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,当更改为reservationStatus是“否”,则用户无法点击进入下一栏,AccessStatus。由于只有在ReservationStatus获得批准后才可点击AccessStatus,因此从No到Yes。我该如何去做呢?到目前为止,可以单击列中的两个单元格。
1)您的“批准”按钮甚至不更新JTable,所以谁知道表中的值如何更改。你所有的代码都会在你的数据库上调用SQL。此外,您正在使用PreparedStatement不正确。你应该为PreparedStatement设置参数。例如:https://stackoverflow.com/questions/15713360/geting-data-from-multiple-table-when-selecting-a-row-then-clicking-a-button/15713391#15713391 – camickr
2)为什么你使用MouseListener?看起来这个逻辑可能会完全刷新JTable。如果是这样,那么这告诉我你的SQL更新数据将所有的值设置为“是”。因此,修复SQL并正确使用PreparedStatement,发现错误将更容易。不要忘记添加调试代码来显示传递给PreparedStatement的参数值。 – camickr
3)我甚至不确定为什么需要MouseListener或为什么需要重置内容窗格?编辑表格应导致表格自行更新。此外,您将使用'setModel(...)'方法来刷新表格,而不是创建一个全新的表格。 – camickr