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diff --git a/examples/sql/overview/subclass5/main.cpp b/examples/sql/overview/subclass5/main.cpp
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+++ b/examples/sql/overview/subclass5/main.cpp
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+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for TQt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+#include "main.h"
+#include <qdatatable.h>
+
+InvoiceItemCursor::InvoiceItemCursor() :
+    TQSqlCursor( "invoiceitem" )
+{
+    TQSqlFieldInfo productName( "productname", TQVariant::String );
+    append( productName );
+    setCalculated( productName.name(), TRUE );
+
+    TQSqlFieldInfo productPrice( "price", TQVariant::Double );
+    append( productPrice );
+    setCalculated( productPrice.name(), TRUE );
+
+    TQSqlFieldInfo productCost( "cost", TQVariant::Double );
+    append( productCost );
+    setCalculated( productCost.name(), TRUE );
+}
+
+
+TQVariant InvoiceItemCursor::calculateField( const TQString & name )
+{
+
+    if ( name == "productname" ) {
+	TQSqlQuery query( "SELECT name FROM prices WHERE id=" +
+		     field( "pricesid" )->value().toString() );
+	if ( query.next() )
+	    return query.value( 0 );
+    }
+    else if ( name == "price" ) {
+	TQSqlQuery query( "SELECT price FROM prices WHERE id=" +
+		     field( "pricesid" )->value().toString() );
+	if ( query.next() )
+	    return query.value( 0 );
+    }
+    else if ( name == "cost" ) {
+	TQSqlQuery query( "SELECT price FROM prices WHERE id=" +
+		     field( "pricesid" )->value().toString() );
+	if ( query.next() )
+	    return TQVariant( query.value( 0 ).toDouble() *
+			     value( "quantity").toDouble() );
+    }
+
+    return TQVariant( TQString::null );
+}
+
+
+TQSqlRecord *InvoiceItemCursor::primeInsert()
+{
+    TQSqlRecord *buffer = editBuffer();
+    TQSqlQuery query( "SELECT NEXTVAL( 'invoiceitem_seq' )" );
+    if ( query.next() )
+	buffer->setValue( "id", query.value( 0 ) );
+    buffer->setValue( "paiddate", TQDate::currentDate() );
+    buffer->setValue( "quantity", 1 );
+
+    return buffer;
+}
+
+
+int main( int argc, char *argv[] )
+{
+    TQApplication app( argc, argv );
+
+    if ( createConnections() ) {
+	InvoiceItemCursor invoiceItemCursor;
+
+	TQDataTable *invoiceItemTable = new TQDataTable( &invoiceItemCursor );
+
+	app.setMainWidget( invoiceItemTable );
+
+	invoiceItemTable->addColumn( "productname", "Product" );
+	invoiceItemTable->addColumn( "price",	    "Price" );
+	invoiceItemTable->addColumn( "quantity",    "Quantity" );
+	invoiceItemTable->addColumn( "cost",	    "Cost" );
+	invoiceItemTable->addColumn( "paiddate",    "Paid" );
+
+	invoiceItemTable->refresh();
+	invoiceItemTable->show();
+
+	return app.exec();
+    }
+
+    return 1;
+}