Updating resultsets using vectors in editable JTables

Question

Ok i am currently retrieveing my result from a vector of vectors from a query:
public void presentResultSet (ResultSet rs)throws SQLException {
Vector dataVector=new Vector();
try
{if (!rs.next())
    JOptionPane.showMessageDialog(null, " No records for student" );
  else {
    do{
     Vector rowVector=new Vector();
     rowVector.addElement(rs.getString("studentID"));
     rowVector.addElement(rs.getString("moduleID"));
     rowVector.addElement(rs.getString("examMark"));
     dataVector.addElement (rowVector);
    }while(rs.next());
} tab.setData(dataVector);
dataTableScrollPane.setViewportView(dataTable);}
catch (Exception f){ System.out.println (f.getMessage());
This method is fine actually as it displays the results onto my GUI. But problem is, i want to add another feature of the system where users can click on any cells in the JTable, edit it and JTable will be able to help me update it onto my tables in mysql.
I have set the public boolean iseditable into true.
but can anyone tell me how to write the public void setValueAt method ? how to retrieve that information that the user type into the particular cell and update it onto the database ? Please help !

Answer 1

Ok I assume because your using a JTable that you are using your own TableModel because the DefaultTableModel usually won't do everything you want. So if your not extending DefaultTableModel you need to start there.
In your Table model you need a method called setValueAt which will overide the DefaultTableMode.setValueAt().
Your TableModel's setValueAt() will get called by the table Cell Renderer when ever a cell is edited.
So to break down setValueAt(Object aValue,int aRow,int aColumn)
Object aValue = is whatever the user has entered in the Cell. Now its an Object and not a String because you can have all sort of things in a JTable Cell such as checkboxes,buttons, etc.
The int Row and int Column are pretty self explanitory.
I don't know what your table looks like but lets say you have have 3 columns
StudentID,ModuleID,ExamMark you could do something like this
public void setValueAt(Object aValue,int aRow,int aColumn)
        // In your table model there should be some Vector that contains your other 
        // Vectors. In this example "rows" is that Vector
       // this assigns rowVector the Vector of Columns at the row
       // that was edited by the user in the JTable. It should contain the 3 columns
       Vector rowVector = (Vector)rows.elementAt(aRow);
        // this will overwrite the current value at that column
        rowVector.setElementAt(aValue,aColumn );
        // you may need to cast aValue into whatever Object you plan on storing probably a string
        // ie. rowVector.setElementAt((String)aValue,aColumn );
} Your Table Model should now contain the new value in its rows Vector all you have do is add someway to save that new Vector back into the Database.
Hope this helps I didn't compile it but I think it will work or at least give you a better understanding....
Or maybe I confused you more.
Good Luck
Justin