SQL Connection Problem

[Utku]

Hello guys. My application works well on my PC. But if I try to use it on the PC which needs my application, it doesn't connect to SQL server. I tried ODBC (MySQL ODBC connector) and SQLite as database server. I don't know what causes to error; I've copied required DLLs, checked my connection code but found nothing.

Here is my connection function:

QSqlDatabase library::database()
{
    QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
    db.setDatabaseName("Library");
    bool ok = db.open();
    if (!ok) { QMessageBox::critical(this, "Error!", "Can't connect to database."); }
    return db;
}

QSqlDatabase library::database()
{
    QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
    db.setDatabaseName("Library");
    bool ok = db.open();
    if (!ok) { QMessageBox::critical(this, "Error!", "Can't connect to database."); }
    return db;
}

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Thanks in advance for your replies.