Cursor Question

When I run this code the first time in the SQL Server Management Studio it returns the results I expect but if I run it a second time I do not get any results back.

I am trying to learn about cursors and as you can see I need some help.

declare @usrName as varchar(15)

declare @FirstName as varchar(15)

declare db_cursor2 CURSOR FOR

select usr_usrnm, usr_nm_frst_txt FROM usr;

open db_cursor2

--fetch next from db_cursor

while @@FETCH_STATUS = 0

begin

  fetch next from db_cursor2 

end

close db_cursor2;

deallocate db_cursor2;