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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>/****************************************************************************
** $Id$
**
** Copyright (C) 1992-2000 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 &lt;<a href="qdatatable-h.html">qdatatable.h</a>&gt;

<a name="f142"></a>InvoiceItemCursor::InvoiceItemCursor() :
    <a href="qsqlcursor.html">QSqlCursor</a>( "invoiceitem" )
{
    <a href="qsqlfieldinfo.html">QSqlFieldInfo</a> productName( "productname", QVariant::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">QSqlFieldInfo</a> productPrice( "price", QVariant::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">QSqlFieldInfo</a> productCost( "cost", QVariant::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 );
}


QVariant InvoiceItemCursor::<a href="qsqlcursor.html#calculateField">calculateField</a>( const <a href="qstring.html">QString</a> &amp; name )
{

    if ( name == "productname" ) {
        <a href="qsqlquery.html">QSqlQuery</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">QSqlQuery</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">QSqlQuery</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 QVariant( query.<a href="qsqlquery.html#value">value</a>( 0 ).toDouble() *
                             <a href="qsqlquery.html#value">value</a>( "quantity").toDouble() );
    }

    return QVariant( QString::null );
}


int main( int argc, char *argv[] )
{
    <a href="qapplication.html">QApplication</a> app( argc, argv );

    if ( createConnections() ) {
        InvoiceItemCursor invoiceItemCursor;

        <a href="qdatatable.html">QDataTable</a> *invoiceItemTable = new <a href="qdatatable.html">QDataTable</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;
}


bool createConnections()
{
    // create the default database connection
    <a href="qsqldatabase.html">QSqlDatabase</a> *defaultDB = QSqlDatabase::<a href="qsqldatabase.html#addDatabase">addDatabase</a>( DB_SALES_DRIVER );
    if ( ! defaultDB ) {
        <a href="qapplication.html#qWarning">qWarning</a>( "Failed to connect to driver" );
        return FALSE;
    }
    defaultDB-&gt;<a href="qsqldatabase.html#setDatabaseName">setDatabaseName</a>( DB_SALES_DBNAME );
    defaultDB-&gt;<a href="qsqldatabase.html#setUserName">setUserName</a>( DB_SALES_USER );
    defaultDB-&gt;<a href="qsqldatabase.html#setPassword">setPassword</a>( DB_SALES_PASSWD );
    defaultDB-&gt;<a href="qsqldatabase.html#setHostName">setHostName</a>( DB_SALES_HOST );
    if ( ! defaultDB-&gt;<a href="qsqldatabase.html#open">open</a>() ) {
        <a href="qapplication.html#qWarning">qWarning</a>( "Failed to open sales database: " +
                  defaultDB-&gt;<a href="qsqldatabase.html#lastError">lastError</a>().driverText() );
        <a href="qapplication.html#qWarning">qWarning</a>( defaultDB-&gt;<a href="qsqldatabase.html#lastError">lastError</a>().databaseText() );
        return FALSE;
    }

    // create a named connection to oracle
    <a href="qsqldatabase.html">QSqlDatabase</a> *oracle = QSqlDatabase::<a href="qsqldatabase.html#addDatabase">addDatabase</a>( DB_ORDERS_DRIVER, "ORACLE" );
    if ( ! oracle ) {
        <a href="qapplication.html#qWarning">qWarning</a>( "Failed to connect to oracle driver" );
        return FALSE;
    }
    oracle-&gt;<a href="qsqldatabase.html#setDatabaseName">setDatabaseName</a>( DB_ORDERS_DBNAME );
    oracle-&gt;<a href="qsqldatabase.html#setUserName">setUserName</a>( DB_ORDERS_USER );
    oracle-&gt;<a href="qsqldatabase.html#setPassword">setPassword</a>( DB_ORDERS_PASSWD );
    oracle-&gt;<a href="qsqldatabase.html#setHostName">setHostName</a>( DB_ORDERS_HOST );
    if ( ! oracle-&gt;<a href="qsqldatabase.html#open">open</a>() ) {
        <a href="qapplication.html#qWarning">qWarning</a>( "Failed to open orders database: " +
                  oracle-&gt;<a href="qsqldatabase.html#lastError">lastError</a>().driverText() );
        <a href="qapplication.html#qWarning">qWarning</a>( oracle-&gt;<a href="qsqldatabase.html#lastError">lastError</a>().databaseText() );
        return FALSE;
    }

    return TRUE;
}
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