Why sqlite db address not working at all?

Hi
I'm using sqlite with Qt library

Code:

---

#include <QtSql/QSqlDatabase>
#include <QSqlQuery>

---

this is my code for connection :

Code:

---

QSqlDatabase mydb = QSqlDatabase::addDatabase("QSQLITE");
    mydb.setDatabaseName(QCoreApplication::applicationDirPath() + "/data/27115");
   mydb.open();
    QSqlQuery query("SELECT * FROM setting");
    if (mydb.open())
    {
        query.exec();
        int fieldNo = query.record().indexOf("theme");
        while (query.next()) {
            ui->cmb_themes->addItem(query.value(fieldNo).toString());
        }
    }
   mydb.close();

---

Now in my system,its work right without any problem,but i copied debug folder in other computer and run, my application cant find db file!!

in other system i installed qt sdk and open myapp.pro on it,and run.. next .. db file could run and worked.why?
in my laptop with Windows7 64 bits , output address is : '.....'-build-desktop-Qt_4_7_4_for_Desktop_-_MinGW_4_4__Qt_SDK__Debug

and in other computer with windows 7 32 bits , output address is : '.....'-build-desktop

thanks before answer

Did you deploy the sqlite driver to the other machine?

No.i'm using it direct(with db file address)
how can i?
if deploy sqlite,it can works?

http://www.qtcentre.org/threads/4544...354#post208354

oh yes.very good answer
so thanks