Cannot connect to mysql database

Hi all,
I am writing a little program that open a window with a form. When the user fills the form and click Submit, the app should connect to mysql server and open another window FenP.
But when I click on Submit, I always have the dialog Box saying that the connection failed.
Can you help me?
Below is my code:

main.cpp

Code:

---

#include <QApplication>
#include "FenetreAccueil.h"
 
int main(int argc,char* argv[])
{
    QApplication app(argc, argv);
    FenetreAccueil login;
    login.show();
    return app.exec();
}

---

FenetreAcceuil.h

Code:

---

#ifndef FENETREACCUEIL_H
#define FENETREACCUEIL_H
 
#include <QtGui>
#include <QtSql>
#include "FenetrePrincipale.h"
 
 
class FenetreAccueil : public QWidget
{
    Q_OBJECT
 
    public:
        explicit FenetreAccueil(QWidget *parent = 0);
 
    public slots:
        void connectDB();
 
    private:
        QPushButton *m_connect;
        QPushButton *m_cancel;
        QLineEdit *m_password;
        QLineEdit *m_login;
        QLineEdit *m_addressBD;
        QLabel *m_label;
 
};
 
#endif // FENETREACCUEIL_H

---

Code:

---

#include "FenetreAccueil.h"
 
FenetreAccueil::FenetreAccueil(QWidget *parent) :
    QWidget(parent)
{
    //Creation du layout de formulaire et ses widgets
    m_login=new QLineEdit;
    m_password=new QLineEdit;
    m_password->setEchoMode(QLineEdit::Password);//affichage d'asterisques a la saisie
    m_addressBD=new QLineEdit;//format adresse IP ou pas?
 
    QFormLayout *formAccueil=new  QFormLayout;
    formAccueil->addRow(tr("&Login"),m_login);
    formAccueil->addRow(tr("Password"),m_password);
    formAccueil->addRow(tr("mySQL server address"),m_addressBD);
 
    //Creation d'un layout horizontal pour les boutons
    m_connect=new QPushButton(tr("Connect"));
    m_cancel=new QPushButton(tr("Cancel"));
 
    QHBoxLayout *boutonLayout=new QHBoxLayout;
    boutonLayout->addWidget(m_connect);
    boutonLayout->addWidget(m_cancel);
 
 
    //Creation d'un layout pour le logo
    QLabel *logo=new QLabel(this);
    logo->setPixmap(QPixmap("images/grandlogo.png"));
 
    QHBoxLayout *logoLayout=new QHBoxLayout;
    logoLayout->addWidget(logo);
 
 
    //Creation d'un layout pour le message d'acceuil
    m_label = new QLabel(tr("Welcome in callTracker"),this);
 
    QHBoxLayout *labelLayout=new QHBoxLayout;
    labelLayout->addWidget(m_label);
 
    //Creation du layout principal de la fenetre
    QVBoxLayout *layoutPrincipal=new QVBoxLayout;
 
    //Ajout du layout d'accueil
    layoutPrincipal->addLayout(labelLayout);
 
    //Ajout du layout de formulaire
    layoutPrincipal->addLayout(formAccueil);
 
    //Ajout du layout des boutons
    layoutPrincipal->addLayout(boutonLayout);
 
    setLayout(layoutPrincipal);
    setWindowTitle(tr("Welcome"));
    setWindowFlags(Qt::Tool);//Pour empecher le changement de dimensions de la fenetre
    resize(300,350);
 
    //Generation des signaux et des slots
    connect(m_connect,SIGNAL(clicked()),this,SLOT(connectDB()));
    connect(m_cancel,SIGNAL(clicked()),qApp, SLOT(quit()));
}
 
void FenetreAccueil::connectDB()
{
    QString server;
    server=m_addressBD->text();
 
    QSqlDatabase db=QSqlDatabase::addDatabase("QMYSQL");
    db.setHostName(server);
    db.setDatabaseName("calltracker");
    db.setUserName("appClient");
    db.setPassword("Clown2neige");
    bool ok=db.open();
 
    if(ok)
    {
        FenetrePrincipale *fenP=new FenetrePrincipale;
        fenP->show();
     }
    else
        QMessageBox::critical(this,"callTracker",tr("Connection to database failed"));
 
}

---

Thank you

I don't know if your problem is this, but I had a similar problem. At least on windows, qt framework comes without mysql driver. I think it comes with sqlite and maybe odbc, so maybe you could connect using qodbc or something like that. By the way, you can print the loaded drivers with this line:

qDebug() << QSqlDatabase::drivers();

QSqlDatabase::lastError() and the console output from the program will probably tell you exactly what the problem is.

Fearu is correct about the absence of a Qt MySQL plugin in the shipped Qt SDK on Windows. Most Linux builds will have it, but I don't know if the shipped SDK bundle does.

You're right.
Here is the software output when I try to connect to database.
Démarrage de C:\Users\HP\Desktop\lastClient\callTracker-build-desktop-Qt_4_7_4_for_Desktop_-_MinGW_4_4__Qt_SDK__Debug\debug\callTracker.exe... QSqlDatabase: QMYSQL driver not loaded
QSqlDatabase: available drivers: QSQLITE
Thanks