Updating data in sql from jtable

Question

My last questions/problems are solved thank you for the advice. In which, I have another problem encountered says:

java.lang.ArrayIndexOutOfBoundsException:-1

My code in updating is when click from a jtable it will be shown in a textfield, my code:

> try{
>              DefaultTableModel model= (DefaultTableModel)tbl_stud.getModel();
>                model.fireTableDataChanged();
>             int row=tbl_stud.getSelectedRow();
>             String tbl_click=(tbl_stud.getModel().getValueAt(row, row).toString());
>           String sql="Select * from students where id_num='"+tbl_click+"';"; 
>             pst=conn.prepareStatement(sql);
>         rs=pst.executeQuery(sql);
>             if(rs.next()){
>                 String add1=rs.getString("id_num");
>                 up_idnum.setText(add1);
>                 String add2=rs.getString("fname");
>                 up_fname.setText(add2);
>                 String add3=rs.getString("mname");
>                 up_mname.setText(add3);
>                 String add4=rs.getString("lname");
>                 up_lname.setText(add4);
>                 
>                 String add8=rs.getString("username");
>                 up_username.setText(add8);
>                 String add9=rs.getString("password");
>                 up_pass.setText(add9);
>                 update_table();
>             }
>             
>             
>         }
>         catch(Exception o){
>             JOptionPane.showMessageDialog(null, o);
>             
>         }
>     }

but i always get that error, how can i prevent it? thank you.

Answer 1

 String tbl_click=(tbl_stud.getModel().getValueAt(row, row).toString());

在Model中，您需要获取ID为num的选定行和列索引的值。

String tbl_click=(tbl_stud.getModel().getValueAt(row, columnNo).toString());