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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- /home/reggie/tmp/qt-3.0-reggie-5401/qt-x11-commercial-3.0.5/doc/sql.doc:67 --><html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>sql/overview/subclass5/main.cpp Example File</title><style type="text/css"><!--h3.fn,span.fn { margin-left: 1cm; text-indent: -1cm; }a:link { color: #004faf; text-decoration: none }a:visited { color: #672967; text-decoration: none }body { background: #ffffff; color: black; }--></style></head><body><table border="0" cellpadding="0" cellspacing="0" width="100%"><tr bgcolor="#E5E5E5"><td valign=center> <a href="index.html"><font color="#004faf">Home</font></a> | <a href="classes.html"><font color="#004faf">All Classes</font></a> | <a href="mainclasses.html"><font color="#004faf">Main Classes</font></a> | <a href="annotated.html"><font color="#004faf">Annotated</font></a> | <a href="groups.html"><font color="#004faf">Grouped Classes</font></a> | <a href="functions.html"><font color="#004faf">Functions</font></a></td><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>/****************************************************************************** $Id$**** 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 <<a href="qdatatable-h.html">qdatatable.h</a>><a name="f25"></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> & 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" )->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" )->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" )->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 );}QSqlRecord *InvoiceItemCursor::<a href="qsqlcursor.html#primeInsert">primeInsert</a>(){ <a href="qsqlrecord.html">QSqlRecord</a> *buffer = <a href="qsqlcursor.html#editBuffer">editBuffer</a>(); <a href="qsqlquery.html">QSqlQuery</a> query( "SELECT NEXTVAL( 'invoiceitem_seq' );" ); if ( query.<a href="qsqlquery.html#next">next</a>() ) buffer-><a href="qsqlrecord.html#setValue">setValue</a>( "id", query.<a href="qsqlquery.html#value">value</a>( 0 ) ); buffer-><a href="qsqlrecord.html#setValue">setValue</a>( "paiddate", QDate::currentDate() ); buffer-><a href="qsqlrecord.html#setValue">setValue</a>( "quantity", 1 ); return buffer;}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>( &invoiceItemCursor ); app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( invoiceItemTable ); invoiceItemTable-><a href="qdatatable.html#addColumn">addColumn</a>( "productname", "Product" ); invoiceItemTable-><a href="qdatatable.html#addColumn">addColumn</a>( "price", "Price" ); invoiceItemTable-><a href="qdatatable.html#addColumn">addColumn</a>( "quantity", "Quantity" ); invoiceItemTable-><a href="qdatatable.html#addColumn">addColumn</a>( "cost", "Cost" ); invoiceItemTable-><a href="qdatatable.html#addColumn">addColumn</a>( "paiddate", "Paid" ); invoiceItemTable-><a href="qdatatable.html#refresh">refresh</a>(); invoiceItemTable-><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-><a href="qsqldatabase.html#setDatabaseName">setDatabaseName</a>( DB_SALES_DBNAME ); defaultDB-><a href="qsqldatabase.html#setUserName">setUserName</a>( DB_SALES_USER ); defaultDB-><a href="qsqldatabase.html#setPassword">setPassword</a>( DB_SALES_PASSWD ); defaultDB-><a href="qsqldatabase.html#setHostName">setHostName</a>( DB_SALES_HOST ); if ( ! defaultDB-><a href="qsqldatabase.html#open">open</a>() ) { <a href="qapplication.html#qWarning">qWarning</a>( "Failed to open sales database: " + defaultDB-><a href="qsqldatabase.html#lastError">lastError</a>().driverText() ); <a href="qapplication.html#qWarning">qWarning</a>( defaultDB-><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-><a href="qsqldatabase.html#setDatabaseName">setDatabaseName</a>( DB_ORDERS_DBNAME ); oracle-><a href="qsqldatabase.html#setUserName">setUserName</a>( DB_ORDERS_USER ); oracle-><a href="qsqldatabase.html#setPassword">setPassword</a>( DB_ORDERS_PASSWD ); oracle-><a href="qsqldatabase.html#setHostName">setHostName</a>( DB_ORDERS_HOST ); if ( ! oracle-><a href="qsqldatabase.html#open">open</a>() ) { <a href="qapplication.html#qWarning">qWarning</a>( "Failed to open orders database: " + oracle-><a href="qsqldatabase.html#lastError">lastError</a>().driverText() ); <a href="qapplication.html#qWarning">qWarning</a>( oracle-><a href="qsqldatabase.html#lastError">lastError</a>().databaseText() ); return FALSE; } return TRUE;}</pre><!-- eof --><p><address><hr><div align=center><table width=100% cellspacing=0 border=0><tr><td>Copyright © 2002 <a href="http://www.trolltech.com">Trolltech</a><td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a><td align=right><div align=right>Qt version 3.0.5</div></table></div></address></body></html>⌨️ 快捷键说明
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