Question

I’ve got the following problem with QODBC driver:

bool Dialog::createOdbcConnection(QSqlDatabase * db, QString odbcName,QString user,QString pass)
{
    db = new QSqlDatabase();
    db->addDatabase("QODBC");
    db->setDatabaseName(odbcName);
    if(!user.isEmpty())
        db->setUserName(user);
    if(!pass.isEmpty())
        db->setPassword(pass);

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

    if (!db->open())
    {
            QMessageBox mgs;
            qDebug() << db->lastError().text();
            mgs.setText(db->lastError().text());
            mgs.exec();
            return false;
    }

    return true;
}

qDebug() << QSqlDatabase :: drivers(); returns ("QSQLITE", "QODBC3", "QODBC"), but the program doesn’t open my database, db->open() returns false and the error is "Driver not loaded Driver not loaded"

Answer 1

Whats the use of the QSqlDatabase Parameter in your createOdbcConnection-Method?
I would rather remove it from there, define a QSqlDatabase Object in your Class-Definition:

private:
    QSqlDatabase db_;

And initialize it in your Class-Constructor:

db_ = QSqlDatabase::addDatabase("QODBC");

That should work!