CODEWITHSUNDEEP
javaswingmodeljtable
Abstract
Abstract

Reputation: 684

Undesirable change in displayed fields in JTable

at the moment I have an app that allows me to display data in a Jtable and then when I double click the Jtable this open a little window to edit only 3 fields, comments, expiration date and description. I update the this values (whit a preparedStatement) the thing is that everytime that I make an update to the database my table just refresh itself, changing the dateFormat with the new value that I've just inserted in my other window but with a different format!. How is this possible?

I' don't understand this because the only I only set a model to the table when I press my "search" button which contains the following code:

ArrayList<FiltrosResumen> filtrosResumenList = MainFrame.dataBase.searchFiltroResumen(query);
        FiltrosResumenTableModel resumenModel = new FiltrosResumenTableModel(filtrosResumenList);
        this.resumenTable.setModel(resumenModel);
        hideColumns(1);

SS

I'm using a custom table model containing all the table Fields, so first as you can see I colect all the rows from the database into a ArrayList from a custom object "FiltrosResumen", then I pass this to the constructor from my customTable model "FiltrosResumenTableModel" which extends AbstractTableMode I'm not using any special renders the most important methods are 

public Object getValueAt(int rowIndex, int columnIndex) {
        switch (columnIndex) {
            case 0:
                return this.filtrosResumen.get(rowIndex).getIdFiltro();
            //....
            //case 9:
           default:
                return null;
        }
    }

    public void setValueAt(Object aValue, int rowIndex, int columnIndex) {
        FiltrosResumen filtroResumen = new FiltrosResumen();
        switch (columnIndex) {
            case 0:
                filtroResumen = this.filtrosResumen.get(rowIndex);
                filtroResumen.setIdFiltro(Long.parseLong(aValue.toString()));
                this.fireTableCellUpdated(rowIndex, columnIndex);
                break;}
             //....
            //case 9: 

            }

And the constructor

  public FiltrosResumenTableModel(List<FiltrosResumen> filtrosResumen) {
        this.filtrosResumen = filtrosResumen;

    }

And as I stated before, the database does not interact directly whit the table since storing the query result in a ArrayList, and then sending this to the constructor of my customTableModel.

EDIT: In order to change the value from one of the rows items I send a FiltrosResumen Object in this way:

FiltrosResumenTableModel modelo = (FiltrosResumenTableModel) this.resumenTable.getModel();
resumen = modelo.getResumen(row);
EditResumenIF editConexionesIF = new EditResumenIF(resumen);

EDIT: Passing a the resumen object to a InternalFrame Constructor (EditResumenIF).So in this new InternalFrame (EditResumenIF) I assign the values to a JCalendar and a JTextField to change the values and then save them. Afther the same object received by the constructor to a method that does the query and then return a string, ( if the string it's empty it' means that the query was successful without any mistakes)

String error = MainFrame.dataBase.updateResumen(resumen, resumen.getIdFiltro());

How comes that my Table knows that the value changed?

Upvotes: 1

Views: 187

Answers (1)

trashgod
trashgod

Reputation: 205865

The default renderer for a cell of type Object.class is "a label that displays the object's string value." Unless your implementation of TableModel override's getColumnClass() to return some other value, your result is not unexpected. You might compare this example using DefaultTableModel to your implementation.

Addendum: How does my table know that the value changed?

JTable is a TableModelListener; any change to the model is (or should be) propagated to the table. Absent a complete example, I'm guessing that you are using a second table, table2, to edit a copy of certain data obtained from the original, table1.

  • Verify that you are copying the data in getResumen() and not just copying a reference to the table1 model.

  • In your implementation of setValueAt() in the TableModel of table2, update the model of table1. The exact mechanism depends on your TableModel; two approaches are contrasted here.

Addendum: I'm not using another table…I'm passing a reference to my internal frame.

The same principles would apply. As an alternative to directly coupling the models, let the table's model be a PropertyChangeListener to the internal frame, as shown here.

Upvotes: 3

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