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Source code

void MainForm::init()
{
        QSqlDatabase *db = QSqlDatabase::addDatabase( "MYSQL3" );
        db->setDatabaseName( "test" );
	db->setUserName( "sqldemo" );
	db->setPassword( "eagle" );
	db->setHostName( "192.168.1.4" );
	db->setPort( 3306 );
	
	if ( !db->open() )
	{
               // flag error message
	}
    }
}

Source code

#include <qapplication.h>
#include <qsqldatabase.h>
#include <qsqlcursor.h>

int main( int argc, char *argv[] )
{
  QApplication app( argc, argv );

  QSqlDatabase *db = QSqlDatabase::addDatabase( "QMYSQL3" );
  db->setDatabaseName( "test" );
  db->setUserName( "sqldemo" );
  db->setPassword( "eagle" );
  db->setHostName( "192.168.1.4" );
  db->setPort( 3306 );

  if ( !db->open() )
    {
      qWarning( "Failed to open database: " + db->lastError().driverText() );
      qWarning( db->lastError().databaseText() );
       return 1;
     }
  return 0;
}