Hi Ragul,
Challenge as in learning how to do? In this case, Jorge's answer is the way to go.
But you see, there is no way to a access directly, through URL, a database object. At least you will need some middle layer that will get the object.
So, in order to receive a faster answer (and possibly suggestions of better ways of dping something), It's always better to explain what you're trying to accomplish, instead of just asking how to do something :)
Cheers and good studies.