/****************************************************************************** $Id: qt/main.cpp   3.3.4   edited Sep 10 2003 $**** Copyright (C) 1992-2002 Trolltech AS.  All rights reserved.**** This file is part of an example program for Qt.  This example** program may be used, distributed and modified without limitation.*******************************************************************************/#include "main.h"#include <qdatatable.h>InvoiceItemCursor::InvoiceItemCursor() :    QSqlCursor( "invoiceitem" ){    QSqlFieldInfo productName( "productname", QVariant::String );    append( productName );    setCalculated( productName.name(), TRUE );}QVariant InvoiceItemCursor::calculateField( const QString & name ){    if ( name == "productname" ) {	QSqlQuery query( "SELECT name FROM prices WHERE id=" +		     field( "pricesid" )->value().toString() );	if ( query.next() )	    return query.value( 0 );    }    return QVariant( QString::null );}int main( int argc, char *argv[] ){    QApplication app( argc, argv );    if ( createConnections() ) {	InvoiceItemCursor invoiceItemCursor;	QDataTable *invoiceItemTable = new QDataTable( &invoiceItemCursor );	app.setMainWidget( invoiceItemTable );	invoiceItemTable->addColumn( "productname", "Product" );	invoiceItemTable->addColumn( "quantity",    "Quantity" );	invoiceItemTable->addColumn( "paiddate",    "Paid" );	invoiceItemTable->refresh();	invoiceItemTable->show();	return app.exec();    }    return 1;}