MySQL driver - Very strange problem. PLEASE HELP ME. Thanks.

[diego]

After making pluin. I made 3 simple files for my example
But now it sitll dont run.
Please help me discover this problem

B.Pro file (Project name is B):

QT += sql
TARGET = B
TEMPLATE = app
SOURCES += main.cpp\
mainwindow.cpp
HEADERS += mainwindow.h
FORMS += mainwindow.ui

main.cpp :

#include <QtGui/QApplication>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}

MainWindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtSql>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent), ui(new Ui::MainWindow)
{
ui->setupUi(this);
createConnection();
}

MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::createConnection()
{
QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
db.setHostName("127.0.0.13");
db.setDatabaseName("ytr");
db.setUserName("root");
db.setPassword("d5aquE");
}

It still appears a message to me that:

QMYSQL driver not loaded

Thanks so much.