Tizen Developers

Hi, i just start learning tizen, and i want to learn database by seeing the code in this sample code.

https://developer.tizen.org/documentation/articles/dbcontrol-sample-code-using-dbmanager-class,

but when i run it in emulator, the application does not work, eventhough it has been succesfully executed from IDE.

and it says that "If the mdb.db file does not exist, it creates the file". but when i build, i could not find any mdb.db file, so in which directory does that .db file lie ?

do i need to do several steps before making .db file ?

Thanks in advance.