QSqlDatabase DataBase = QSqlDatabase::addDatabase("QMYSQL",keyRef);
    DataBase.setDatabaseName("outsafe_dev_db");
    DataBase.setHostName("127.0.0.1");
    if(!DataBase.open("root","XXXXX"))
    {
        qDebug() << "Connection Database error";
        return "ERROR";
    }

    QSqlQuery q(tr("SELECT * FROM `keys` WHERE iSerial = '%1' AND `key` = '%2'").arg(intKey).arg(keyRef),DataBase);
    if(q.size() != 1){
        qDebug() << "SID non trouvé ou doublon";
        return "ERROR";
    }

    int fieldIdUser = q.record().indexOf("id_user");
    int fieldConnected = q.record().indexOf("connected");
    int fieldKey = q.record().indexOf("key");
    bool *ok;
    QString connectedInt;
    while (q.next()){
        userId = q.value(fieldIdUser).toString();
        connectedInt = q.value(fieldConnected).toString();
        key = q.value(fieldKey).toString();
        qDebug() << tr("%1 state is : %2").arg(key).arg(connectedInt);
    }
    q.finish();

    bool freeKey;
    (userId.toInt() == 0) ? freeKey = true : freeKey = false;
    bool connectedKey;
    (connectedInt.toInt() == 1) ? connectedKey = true : connectedKey = false;
    bool validKey = !key.isEmpty();

    if(freeKey && !connectedKey && validKey){
        //ACTIVATION DE LA CLEF
//SEGFAULT HERE
        QSqlQuery query(QSqlQuery(tr("UPDATE `keys` SET nom = '%1' , prenom = '%2' , adress = '%3' , cp = %4 , city = '%5' , tel = '%6' ,"
                                     " mail = '%7' , nation = '%8' , birth = '%9' , login = '%10' , pass = '%11' , secretQuestion = '%12' ,"
                                     " secretAnswer = '%13' "
                                     " WHERE iSerial = '%14' AND `key` = '%15' ")
                                             .arg(nom).arg(prenom).arg(adress).arg(cp).arg(ville).arg(tel)
                                             .arg(mail).arg(nation).arg(dnaiss).arg(id).arg(pw).arg(question)
                                                 .arg(answer).arg(intKey).arg(keyRef),DataBase));

        if(query.numRowsAffected() != 1){
            qDebug() << "SQL activation failed";
        }