Cleanup: Fix up DBOperation after re-styling.

Additional Changes:
 - Don't need to assign a value if its already the default.
 - Improve code readability and comments.
This comment is confusing (and grammatically incorrect). Perhaps you meant:

As GET_OBJECT doesn't expect a class, we don't need to verify it.

Or something similar, possible changing "we don't need" to "no need" or something.

It's style PR. Wat. :P