I really would like to know how to get this class to work. The code i have written so far in trying to get it to work is as follows:

the documentation says:

The following code will map the columns of the model to widgets called mySpinBox, myLineEdit and myCountryChooser:
QDataWidgetMapper *mapper = new QDataWidgetMapper;
mapper->setModel(model);
mapper->addMapping(mySpinBox, 0);
mapper->addMapping(myLineEdit, 1);
mapper->addMapping(myCountryChooser, 2);
mapper->toFirst();
i have tried this, using some editors that have in a form i created, but the data form my database is not being displayed. Any help on how to get this to work will be greatly appreciated.
using qt 4.2