Creating a cursor that returns both a set and a singleton

Question

I have a situation where I have dozens of statically defined pl/sql cursors, along with result processing, where I'd like to modify the cursor definitions in such a way that they may be used to return either a single row or a set.
The effect would be to dynamically add a 'where xx.id = <variable>' predicate to the set oriented cursor to return a single row, but where if I say something (which I know I can't) like 'where xx.id = ANY', then the predicate is effectively ignored.
I don't want to use dynamic sql for performance reasons, and obviously I don't want to have replicate reams of queries and code.
Anyone have any thoughts on how to do this?
Thanks, Jim
Edited by: 922615 on Mar 21, 2012 7:35 PM

Answer 1

It sounds like you just want
CURSOR cursor_name( p_id IN NUMBER )
    IS SELECT *
         FROM some_table
        WHERE (p_id IS NULL or id = p_id );If you pass a NULL for p_id, you'll get every row back. If you pass a non-NULL ID, you'll get just the one row.
Justin