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# SQL Table

This example shows how to use a QDataTable to browse data in a SQL database.

Implementation:

    /****************************************************************************
    **
    ** 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 <qapplication.h>
    #include <qsqldatabase.h>
    #include <qdatatable.h>
    #include <qsqlcursor.h>
    #include <qmessagebox.h>

    /* Modify the following to match your environment */
    #define DRIVER       "QPSQL7"  /* see the Qt SQL documentation for a list of available drivers */
    #define DATABASE     "simpledb" /* the name of your database */
    #define USER         "trond"   /* user name with appropriate rights */
    #define PASSWORD     "trond"   /* password for USER */
    #define HOST         "silverfish.troll.no" /* host on which the database is running */

    class SimpleCursor : public QSqlCursor
    {
    public:
        SimpleCursor () : QSqlCursor( "simpletable" ) {}
    protected:
        QSqlRecord* primeInsert()
        {
            /* a real-world application would use sequences, or the like */
            QSqlRecord* buf = QSqlCursor::primeInsert();
            QSqlQuery q( "select max(id)+1 from simpletable;" );
            if ( q.next() )
                   buf->setValue( "id", q.value(0) );
            return buf;
        }
    };

    int main( int argc, char ** argv )
    {
        QApplication a( argc, argv );

        QSqlDatabase * db = QSqlDatabase::addDatabase( DRIVER );
        db->setDatabaseName( DATABASE );
        db->setUserName( USER );
        db->setPassword( PASSWORD );
        db->setHostName( HOST );

        if( !db->open() ){
            QMessageBox::information( 0, "Unable to open database",
                                      db->lastError().databaseText() + "\nPlease read the README file in the sqltable directory for more information.");
            return 1;
        }

        SimpleCursor cursor;

        QDataTable table( &cursor ); /* data table uses our cursor */
        table.addColumn( "name", "Name" );
        table.addColumn( "address", "Address" );
        table.setSorting( TRUE );

        a.setMainWidget( &table );
        table.refresh(); /* load data */
        table.show();    /* show widget */

        return a.exec();
    }

See also Qt SQL Examples.