doc/html/sqltable-example.html


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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 Table</h1>

 
<p> 
This example shows how to use a <a href="qdatatable.html">QDataTable</a> to browse data in a SQL database.
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
**
** Copyright (C) 1992-2007 Trolltech ASA.  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 &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
#include &lt;<a href="qsqldatabase-h.html">qsqldatabase.h</a>&gt;
#include &lt;<a href="qdatatable-h.html">qdatatable.h</a>&gt;
#include &lt;<a href="qsqlcursor-h.html">qsqlcursor.h</a>&gt;
#include &lt;<a href="qmessagebox-h.html">qmessagebox.h</a>&gt;

/* Modify the following to match your environment */
#define DRIVER       "QSQLITE"  /* see the Qt SQL documentation for a list of available drivers */
#define DATABASE     ":memory:" /* the name of your database */
#define USER         ""   /* user name with appropriate rights */
#define PASSWORD     ""   /* password for USER */
#define HOST         "" /* host on which the database is running */

class SimpleCursor : public <a href="qsqlcursor.html">QSqlCursor</a>
{
public:
    SimpleCursor () : <a href="qsqlcursor.html">QSqlCursor</a>( "simpletable" ) {}
protected:
    <a href="qsqlrecord.html">QSqlRecord</a>* primeInsert()
    {
        /* a real-world application would use sequences, or the like */
<a name="x2453"></a>        <a href="qsqlrecord.html">QSqlRecord</a>* buf = QSqlCursor::<a href="qsqlcursor.html#primeInsert">primeInsert</a>();
        <a href="qsqlquery.html">QSqlQuery</a> q( "select max(id)+1 from simpletable" );
        if ( q.<a href="qsqlquery.html#next">next</a>() )
<a name="x2464"></a>               buf-&gt;<a href="qsqlrecord.html#setValue">setValue</a>( "id", q.<a href="qsqlquery.html#value">value</a>(0) );
        return buf;
    }
};

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

<a name="x2454"></a>    <a href="qsqldatabase.html">QSqlDatabase</a> * db = QSqlDatabase::<a href="qsqldatabase.html#addDatabase">addDatabase</a>( DRIVER );
<a name="x2457"></a>    db-&gt;<a href="qsqldatabase.html#setDatabaseName">setDatabaseName</a>( DATABASE );
<a name="x2460"></a>    db-&gt;<a href="qsqldatabase.html#setUserName">setUserName</a>( USER );
<a name="x2459"></a>    db-&gt;<a href="qsqldatabase.html#setPassword">setPassword</a>( PASSWORD );
<a name="x2458"></a>    db-&gt;<a href="qsqldatabase.html#setHostName">setHostName</a>( HOST );

<a name="x2456"></a>    if( !db-&gt;<a href="qsqldatabase.html#open">open</a>() ){
<a name="x2455"></a>        db-&gt;<a href="qsqldatabase.html#lastError">lastError</a>().showMessage( "An error occured. Please read the README file in the sqltable"
                                     "dir for more information.\n\n" );
        return 1;
    }

<a name="x2461"></a>    if (!db-&gt;<a href="qsqldatabase.html#tables">tables</a>().contains("simpletable")) {
        <a href="qsqlquery.html">QSqlQuery</a> q("create table simpletable(id int, name varchar(20), address varchar(20))", db);
    }

    SimpleCursor cursor;

    <a href="qdatatable.html">QDataTable</a> table( &amp;cursor ); /* data table uses our cursor */
<a name="x2451"></a>    table.<a href="qdatatable.html#addColumn">addColumn</a>( "name", "Name" );
    table.<a href="qdatatable.html#addColumn">addColumn</a>( "address", "Address" );
<a name="x2465"></a>    table.<a href="qtable.html#setSorting">setSorting</a>( TRUE );

    a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &amp;table );
<a name="x2452"></a>    table.<a href="qdatatable.html#refresh">refresh</a>(); /* load data */
    table.<a href="qwidget.html#show">show</a>();    /* show widget */

    return a.<a href="qapplication.html#exec">exec</a>();
}
</pre>

<p> <p>See also <a href="sql-examples.html">Qt SQL Examples</a>.

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