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+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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+<title>sql/overview/subclass5/main.cpp Example File</title>
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+ <a href="index.html">
+<font color="#004faf">Home</font></a>
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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/subclass5/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 &lt;<a href="qdatatable-h.html">qdatatable.h</a>&gt;
+
+<a name="f25"></a>InvoiceItemCursor::InvoiceItemCursor() :
+    <a href="qsqlcursor.html">TQSqlCursor</a>( "invoiceitem" )
+{
+    <a href="qsqlfieldinfo.html">TQSqlFieldInfo</a> productName( "productname", TQVariant::String );
+    <a href="qsqlcursor.html#append">append</a>( productName );
+    <a href="qsqlcursor.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="qsqlcursor.html#append">append</a>( productPrice );
+    <a href="qsqlcursor.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="qsqlcursor.html#append">append</a>( productCost );
+    <a href="qsqlcursor.html#setCalculated">setCalculated</a>( productCost.<a href="qsqlfieldinfo.html#name">name</a>(), TRUE );
+}
+
+
+TQVariant InvoiceItemCursor::<a href="qsqlcursor.html#calculateField">calculateField</a>( const <a href="qstring.html">TQString</a> &amp; name )
+{
+
+    if ( name == "productname" ) {
+        <a href="qsqlquery.html">TQSqlQuery</a> query( "SELECT name FROM prices WHERE id=" +
+                     <a href="qsqlrecord.html#field">field</a>( "pricesid" )-&gt;value().toString() );
+        if ( query.<a href="qsqlquery.html#next">next</a>() )
+            return query.<a href="qsqlquery.html#value">value</a>( 0 );
+    }
+    else if ( name == "price" ) {
+        <a href="qsqlquery.html">TQSqlQuery</a> query( "SELECT price FROM prices WHERE id=" +
+                     <a href="qsqlrecord.html#field">field</a>( "pricesid" )-&gt;value().toString() );
+        if ( query.<a href="qsqlquery.html#next">next</a>() )
+            return query.<a href="qsqlquery.html#value">value</a>( 0 );
+    }
+    else if ( name == "cost" ) {
+        <a href="qsqlquery.html">TQSqlQuery</a> query( "SELECT price FROM prices WHERE id=" +
+                     <a href="qsqlrecord.html#field">field</a>( "pricesid" )-&gt;value().toString() );
+        if ( query.<a href="qsqlquery.html#next">next</a>() )
+            return TQVariant( query.<a href="qsqlquery.html#value">value</a>( 0 ).toDouble() *
+                             <a href="qsqlquery.html#value">value</a>( "quantity").toDouble() );
+    }
+
+    return TQVariant( TQString::null );
+}
+
+
+TQSqlRecord *InvoiceItemCursor::<a href="qsqlcursor.html#primeInsert">primeInsert</a>()
+{
+    <a href="qsqlrecord.html">TQSqlRecord</a> *buffer = <a href="qsqlcursor.html#editBuffer">editBuffer</a>();
+    <a href="qsqlquery.html">TQSqlQuery</a> query( "SELECT NEXTVAL( 'invoiceitem_seq' )" );
+    if ( query.<a href="qsqlquery.html#next">next</a>() )
+        buffer-&gt;<a href="qsqlrecord.html#setValue">setValue</a>( "id", query.<a href="qsqlquery.html#value">value</a>( 0 ) );
+    buffer-&gt;<a href="qsqlrecord.html#setValue">setValue</a>( "paiddate", TQDate::currentDate() );
+    buffer-&gt;<a href="qsqlrecord.html#setValue">setValue</a>( "quantity", 1 );
+
+    return buffer;
+}
+
+
+int main( int argc, char *argv[] )
+{
+    <a href="qapplication.html">TQApplication</a> app( argc, argv );
+
+    if ( createConnections() ) {
+        InvoiceItemCursor invoiceItemCursor;
+
+        <a href="qdatatable.html">TQDataTable</a> *invoiceItemTable = new <a href="qdatatable.html">TQDataTable</a>( &amp;invoiceItemCursor );
+
+        app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( invoiceItemTable );
+
+        invoiceItemTable-&gt;<a href="qdatatable.html#addColumn">addColumn</a>( "productname", "Product" );
+        invoiceItemTable-&gt;<a href="qdatatable.html#addColumn">addColumn</a>( "price",       "Price" );
+        invoiceItemTable-&gt;<a href="qdatatable.html#addColumn">addColumn</a>( "quantity",    "Quantity" );
+        invoiceItemTable-&gt;<a href="qdatatable.html#addColumn">addColumn</a>( "cost",        "Cost" );
+        invoiceItemTable-&gt;<a href="qdatatable.html#addColumn">addColumn</a>( "paiddate",    "Paid" );
+
+        invoiceItemTable-&gt;<a href="qdatatable.html#refresh">refresh</a>();
+        invoiceItemTable-&gt;<a href="qwidget.html#show">show</a>();
+
+        return app.<a href="qapplication.html#exec">exec</a>();
+    }
+
+    return 1;
+}
+</pre><!-- eof -->
+<p><address><hr><div align=center>
+<table width=100% cellspacing=0 border=0><tr>
+<td>Copyright &copy; 2007
+<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
+<td align=right><div align=right>TQt 3.3.8</div>
+</table></div></address></body>
+</html>