Replacing null values in optional prompts and passing to stored proc

Question

Hi,
I want to create a stored procedure with OPTIONAL prompts. When user does not pass a value for that parameter, I want to set the value for that parameter by selecting from a column in table then I WANT to use that paramvalue in sql within cursor of stored proc. How do I do that?
In short, I want to do the following Here is the psuedocode:
Create or replace procedure test (param IN varchar2 DEFAULT NULL)
As
var_param varchar(20);
select param into var_param from dual;
If param is null then select custid from table1 else var_param
OPen ref_cursor for
Select xyz from table2
where fyy = var_para
Can someone let me know the syntax on how to do this in stored proc?
Regards,
hena
Edited by: 904385 on Dec 25, 2011 7:04 AM

Answer 1

Hi,
Merry Christmas, and welcome to the forum!
Here's one way to do what you requested:
CREATE OR REPLACE PROCEDURE     test
(    param     IN     VARCHAR2     DEFAULT     NULL
AS
    ref_cursor     SYS_REFCURSOR;
    var_param     VARCHAR2 (20)     := param;
BEGIN
    IF  var_param  IS NULL
    THEN
     SELECT     custid
     INTO     var_param
     FROM     table1
--     WHERE     ...     -- Unless table1 has only 1 row
    END IF;
    OPEN  ref_cursor
    FOR   SELECT  xyz
       FROM       table2
       WHERE       fyy     = var_param;
END     test;Whatever you're trying to do, this is probably niot the simplest or most efficient way to do it.