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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>sql/overview/subclass4/main.cpp Example File</h1>
<pre>/****************************************************************************
** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 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 <<a href="qdatatable-h.html">ntqdatatable.h</a>>
<a name="f24"></a>InvoiceItemCursor::InvoiceItemCursor() :
<a href="ntqsqlcursor.html">TQSqlCursor</a>( "invoiceitem" )
{
<a href="qsqlfieldinfo.html">TQSqlFieldInfo</a> productName( "productname", TQVariant::String );
<a href="ntqsqlcursor.html#append">append</a>( productName );
<a href="ntqsqlcursor.html#setCalculated">setCalculated</a>( productName.<a href="qsqlfieldinfo.html#name">name</a>(), TRUE );
<a href="qsqlfieldinfo.html">TQSqlFieldInfo</a> productPrice( "price", TQVariant::Double );
<a href="ntqsqlcursor.html#append">append</a>( productPrice );
<a href="ntqsqlcursor.html#setCalculated">setCalculated</a>( productPrice.<a href="qsqlfieldinfo.html#name">name</a>(), TRUE );
<a href="qsqlfieldinfo.html">TQSqlFieldInfo</a> productCost( "cost", TQVariant::Double );
<a href="ntqsqlcursor.html#append">append</a>( productCost );
<a href="ntqsqlcursor.html#setCalculated">setCalculated</a>( productCost.<a href="qsqlfieldinfo.html#name">name</a>(), TRUE );
}
TQVariant InvoiceItemCursor::<a href="ntqsqlcursor.html#calculateField">calculateField</a>( const <a href="ntqstring.html">TQString</a> & name )
{
if ( name == "productname" ) {
<a href="ntqsqlquery.html">TQSqlQuery</a> query( "SELECT name FROM prices WHERE id=" +
<a href="ntqsqlrecord.html#field">field</a>( "pricesid" )->value().toString() );
if ( query.<a href="ntqsqlquery.html#next">next</a>() )
return query.<a href="ntqsqlquery.html#value">value</a>( 0 );
}
else if ( name == "price" ) {
<a href="ntqsqlquery.html">TQSqlQuery</a> query( "SELECT price FROM prices WHERE id=" +
<a href="ntqsqlrecord.html#field">field</a>( "pricesid" )->value().toString() );
if ( query.<a href="ntqsqlquery.html#next">next</a>() )
return query.<a href="ntqsqlquery.html#value">value</a>( 0 );
}
else if ( name == "cost" ) {
<a href="ntqsqlquery.html">TQSqlQuery</a> query( "SELECT price FROM prices WHERE id=" +
<a href="ntqsqlrecord.html#field">field</a>( "pricesid" )->value().toString() );
if ( query.<a href="ntqsqlquery.html#next">next</a>() )
return TQVariant( query.<a href="ntqsqlquery.html#value">value</a>( 0 ).toDouble() *
<a href="ntqsqlquery.html#value">value</a>( "quantity").toDouble() );
}
return TQVariant( TQString::null );
}
int main( int argc, char *argv[] )
{
<a href="ntqapplication.html">TQApplication</a> app( argc, argv );
if ( createConnections() ) {
InvoiceItemCursor invoiceItemCursor;
<a href="ntqdatatable.html">TQDataTable</a> *invoiceItemTable = new <a href="ntqdatatable.html">TQDataTable</a>( &invoiceItemCursor );
app.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( invoiceItemTable );
invoiceItemTable-><a href="ntqdatatable.html#addColumn">addColumn</a>( "productname", "Product" );
invoiceItemTable-><a href="ntqdatatable.html#addColumn">addColumn</a>( "price", "Price" );
invoiceItemTable-><a href="ntqdatatable.html#addColumn">addColumn</a>( "quantity", "Quantity" );
invoiceItemTable-><a href="ntqdatatable.html#addColumn">addColumn</a>( "cost", "Cost" );
invoiceItemTable-><a href="ntqdatatable.html#addColumn">addColumn</a>( "paiddate", "Paid" );
invoiceItemTable-><a href="ntqdatatable.html#refresh">refresh</a>();
invoiceItemTable-><a href="ntqwidget.html#show">show</a>();
return app.<a href="ntqapplication.html#exec">exec</a>();
}
return 1;
}
</pre><!-- eof -->
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