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Re: Problem - cannot disp

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  To: comp.lang.java.gui

dtsignopoulos@gmail.com wrote:
> There seems to be a problem with processing and inserting large (>2000)
> amounts of data into jtable.
>
> I read single rows from a database, do some processing and use
> insertrow() to feed them to jtable. They get to be displayed (UI) as
> soon ALL rows are done and over with, whereas the desired functionality
> is to be displayed as soon as they are entered (row by row).
>
> Need help as this is turning up to take too much time to figure out.
> Have tried several approaches with no luck.
>
> Some code is listed below:
>
> //  Create staff
>   DefaultTableModel model_matrix = new DefaultTableModel();
>   JScrollPane jScrollPane_matrix = new JScrollPane();
>   JTable jTable_matrix = new JTable(model_matrix) {
>     public boolean isCellEditable(int rowIndex, int vColIndex) {
>       return false;
>     }
>
> // Add some columns
>       model_matrix.addColumn("Timestamp");
>       model_matrix.addColumn("hpic");
>
> //Insert rows
> while (more db rows...){
>             read row...
>             process row...
>             //insert row
>             i = model_matrix.getRowCount();
>             model_matrix.insertRow(i, new Object[] {timestamp, HPIC});
>             model_matrix.fireTableRowsInserted(i,i); setSelectedRow(i);
>
> }
>
> Need help, thanxs

Back to the original question.....(multi posting is a problem, deserves
a mention, but should not be the only response to the question...)

A couple ideas.

The problem of taking too much time to load can be shortened by
limiting the number of rows loaded. You have a table model that is
loading far more data than will be displayed. With a little coding you
can load a limited subset, sliding that subset along depending on the
user needs.

Alternative - fool the user. You probably display about 20 rows. Load
50 into the tablemodel and display. In the meantime load the 2000 into
a second table model, then switch table models. A kludge, certainly,
but it gives the user something to look at while you load the remainder.

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Problem - cannot display "dtsignopoulos" <dtsignopoulos@THRWHITE.remove-dii-this> - 2011-04-27 15:26 +0000
  Re: Problem - cannot disp "Andrew Thompson" <andrew.thompson@THRWHITE.remove-dii-this> - 2011-04-27 15:26 +0000
  Re: Problem - cannot disp "dtsignopoulos" <dtsignopoulos@THRWHITE.remove-dii-this> - 2011-04-27 15:26 +0000
  Re: Problem - cannot disp "Jeff" <jeff@THRWHITE.remove-dii-this> - 2011-04-27 15:26 +0000
  Re: Problem - cannot disp "Andrew Thompson" <andrew.thompson@THRWHITE.remove-dii-this> - 2011-04-27 15:26 +0000
  Re: Problem - cannot disp "Andrew Thompson" <andrew.thompson@THRWHITE.remove-dii-this> - 2011-04-27 15:26 +0000
    Re: Problem - cannot disp "dtsignopoulos" <dtsignopoulos@THRWHITE.remove-dii-this> - 2011-04-27 15:26 +0000
  Re: Problem - cannot disp "Andrew Thompson" <andrew.thompson@THRWHITE.remove-dii-this> - 2011-04-27 15:26 +0000

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