Get the count of lines in a gdbm file

Is there any specific function or any way by which the number of lines in a GDBM file can be counted?Otherwise, I want to retrieve all the lines in a GDBM file at once(Iam able to retrieve the key value pairs using gdbm_fetch() but only one at a time.

I got the solution to the above problem.

Now I am able to retrieve all the key value pairs.

Solution :here