source: trunk/doc/html/sql-overview-subclass5-main-cpp.html

Last change on this file was 190, checked in by rudi, 14 years ago

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[190]1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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6<title>sql/overview/subclass5/main.cpp Example File</title>
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32<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>
33
34
35<pre>/****************************************************************************
36** $Id: sql-overview-subclass5-main-cpp.html 2051 2007-02-21 10:04:20Z chehrlic $
37**
38** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
39**
40** This file is part of an example program for Qt. This example
41** program may be used, distributed and modified without limitation.
42**
43*****************************************************************************/
44
45#include "main.h"
46#include &lt;<a href="qdatatable-h.html">qdatatable.h</a>&gt;
47
48<a name="f25"></a>InvoiceItemCursor::InvoiceItemCursor() :
49 <a href="qsqlcursor.html">QSqlCursor</a>( "invoiceitem" )
50{
51 <a href="qsqlfieldinfo.html">QSqlFieldInfo</a> productName( "productname", QVariant::String );
52 <a href="qsqlcursor.html#append">append</a>( productName );
53 <a href="qsqlcursor.html#setCalculated">setCalculated</a>( productName.<a href="qsqlfieldinfo.html#name">name</a>(), TRUE );
54
55 <a href="qsqlfieldinfo.html">QSqlFieldInfo</a> productPrice( "price", QVariant::Double );
56 <a href="qsqlcursor.html#append">append</a>( productPrice );
57 <a href="qsqlcursor.html#setCalculated">setCalculated</a>( productPrice.<a href="qsqlfieldinfo.html#name">name</a>(), TRUE );
58
59 <a href="qsqlfieldinfo.html">QSqlFieldInfo</a> productCost( "cost", QVariant::Double );
60 <a href="qsqlcursor.html#append">append</a>( productCost );
61 <a href="qsqlcursor.html#setCalculated">setCalculated</a>( productCost.<a href="qsqlfieldinfo.html#name">name</a>(), TRUE );
62}
63
64
65QVariant InvoiceItemCursor::<a href="qsqlcursor.html#calculateField">calculateField</a>( const <a href="qstring.html">QString</a> &amp; name )
66{
67
68 if ( name == "productname" ) {
69 <a href="qsqlquery.html">QSqlQuery</a> query( "SELECT name FROM prices WHERE id=" +
70 <a href="qsqlrecord.html#field">field</a>( "pricesid" )-&gt;value().toString() );
71 if ( query.<a href="qsqlquery.html#next">next</a>() )
72 return query.<a href="qsqlquery.html#value">value</a>( 0 );
73 }
74 else if ( name == "price" ) {
75 <a href="qsqlquery.html">QSqlQuery</a> query( "SELECT price FROM prices WHERE id=" +
76 <a href="qsqlrecord.html#field">field</a>( "pricesid" )-&gt;value().toString() );
77 if ( query.<a href="qsqlquery.html#next">next</a>() )
78 return query.<a href="qsqlquery.html#value">value</a>( 0 );
79 }
80 else if ( name == "cost" ) {
81 <a href="qsqlquery.html">QSqlQuery</a> query( "SELECT price FROM prices WHERE id=" +
82 <a href="qsqlrecord.html#field">field</a>( "pricesid" )-&gt;value().toString() );
83 if ( query.<a href="qsqlquery.html#next">next</a>() )
84 return QVariant( query.<a href="qsqlquery.html#value">value</a>( 0 ).toDouble() *
85 <a href="qsqlquery.html#value">value</a>( "quantity").toDouble() );
86 }
87
88 return QVariant( QString::null );
89}
90
91
92QSqlRecord *InvoiceItemCursor::<a href="qsqlcursor.html#primeInsert">primeInsert</a>()
93{
94 <a href="qsqlrecord.html">QSqlRecord</a> *buffer = <a href="qsqlcursor.html#editBuffer">editBuffer</a>();
95 <a href="qsqlquery.html">QSqlQuery</a> query( "SELECT NEXTVAL( 'invoiceitem_seq' )" );
96 if ( query.<a href="qsqlquery.html#next">next</a>() )
97 buffer-&gt;<a href="qsqlrecord.html#setValue">setValue</a>( "id", query.<a href="qsqlquery.html#value">value</a>( 0 ) );
98 buffer-&gt;<a href="qsqlrecord.html#setValue">setValue</a>( "paiddate", QDate::currentDate() );
99 buffer-&gt;<a href="qsqlrecord.html#setValue">setValue</a>( "quantity", 1 );
100
101 return buffer;
102}
103
104
105int main( int argc, char *argv[] )
106{
107 <a href="qapplication.html">QApplication</a> app( argc, argv );
108
109 if ( createConnections() ) {
110 InvoiceItemCursor invoiceItemCursor;
111
112 <a href="qdatatable.html">QDataTable</a> *invoiceItemTable = new <a href="qdatatable.html">QDataTable</a>( &amp;invoiceItemCursor );
113
114 app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( invoiceItemTable );
115
116 invoiceItemTable-&gt;<a href="qdatatable.html#addColumn">addColumn</a>( "productname", "Product" );
117 invoiceItemTable-&gt;<a href="qdatatable.html#addColumn">addColumn</a>( "price", "Price" );
118 invoiceItemTable-&gt;<a href="qdatatable.html#addColumn">addColumn</a>( "quantity", "Quantity" );
119 invoiceItemTable-&gt;<a href="qdatatable.html#addColumn">addColumn</a>( "cost", "Cost" );
120 invoiceItemTable-&gt;<a href="qdatatable.html#addColumn">addColumn</a>( "paiddate", "Paid" );
121
122 invoiceItemTable-&gt;<a href="qdatatable.html#refresh">refresh</a>();
123 invoiceItemTable-&gt;<a href="qwidget.html#show">show</a>();
124
125 return app.<a href="qapplication.html#exec">exec</a>();
126 }
127
128 return 1;
129}
130</pre><!-- eof -->
131<p><address><hr><div align=center>
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133<td>Copyright &copy; 2007
134<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
135<td align=right><div align=right>Qt 3.3.8</div>
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