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+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA. 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 );
+
+ QSqlFieldInfo productPrice( "price", QVariant::Double );
+ append( productPrice );
+ setCalculated( productPrice.name(), TRUE );
+
+ QSqlFieldInfo productCost( "cost", QVariant::Double );
+ append( productCost );
+ setCalculated( productCost.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 );
+ }
+ else if ( name == "price" ) {
+ QSqlQuery query( "SELECT price FROM prices WHERE id=" +
+ field( "pricesid" )->value().toString() );
+ if ( query.next() )
+ return query.value( 0 );
+ }
+ else if ( name == "cost" ) {
+ QSqlQuery query( "SELECT price FROM prices WHERE id=" +
+ field( "pricesid" )->value().toString() );
+ if ( query.next() )
+ return QVariant( query.value( 0 ).toDouble() *
+ value( "quantity").toDouble() );
+ }
+
+ return QVariant( QString::null );
+}
+
+
+QSqlRecord *InvoiceItemCursor::primeInsert()
+{
+ QSqlRecord *buffer = editBuffer();
+ QSqlQuery query( "SELECT NEXTVAL( 'invoiceitem_seq' )" );
+ if ( query.next() )
+ buffer->setValue( "id", query.value( 0 ) );
+ buffer->setValue( "paiddate", QDate::currentDate() );
+ buffer->setValue( "quantity", 1 );
+
+ return buffer;
+}
+
+
+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( "price", "Price" );
+ invoiceItemTable->addColumn( "quantity", "Quantity" );
+ invoiceItemTable->addColumn( "cost", "Cost" );
+ invoiceItemTable->addColumn( "paiddate", "Paid" );
+
+ invoiceItemTable->refresh();
+ invoiceItemTable->show();
+
+ return app.exec();
+ }
+
+ return 1;
+}