in combination with the function sequence

Hello

I have a problem with a sequence in combination with a function.

I want to generate a kind of a hardware inventory report that contains some kind of a hardware ID (a number not repetitive, auto-increment, allowed deviations). However, I have to keep track of what material ID I used to which material of the inventory, for reasons of traceability. Another important requirement is that whenever the report is run, that the returned hardware IDs are never repeated. If repeatedly runs for the same hardware in the inventory must always return new material ID.

So I was about to create a simple function from PL/SQL where I spend my data of traceability as parameters. Then the function uses internally a sequence (nextval) to generate a new hardware ID, then stores the new ID of material by related values in the input in a table (autonomous transaction) parameters and returns the new ID.

It works pretty well so far.

Now the tricky part: I want where I want to go back the same ID in different columns of a SQL statement.

Let me give you an example:
CREATE SEQUENCE XXX_TEST_SEQ
MINVALUE 1 MAXVALUE 999999999999999999999999999
INCREMENT BY 1 START WITH 1
NOCACHE NOORDER NOCYCLE;


CREATE PACKAGE XXX_TEST_PKG AUTHID CURRENT_USER AS
FUNCTION get_id(p_someparameter NUMBER) RETURN NUMBER;
END XXX_TEST_PKG;


CREATE PACKAGE BODY XXX_TEST_PKG AS
FUNCTION get_id(p_someparameter NUMBER) RETURN NUMBER IS
  l_new_id NUMBER;
BEGIN
  SELECT XXX_TEST_SEQ.NEXTVAL
    INTO l_new_id
    FROM DUAL;
    /* do some more logic, e.g. store the freshly generated ID 
        together with the input parameter values in some tracing table */
  RETURN l_new_id;
END get_id;
END XXX_TEST_PKG;
It is a simplified version of the function for demo.

We will use:
-- 1) this works as expected:
select xxx_test_pkg.get_id(1) from dual;

XXX_TEST_PKG.GET_ID(1) 
------------------------ 
1                        


-- 2) this returns two different numbers:
select xxx_test_pkg.get_id(1) as id_one
    ,  xxx_test_pkg.get_id(1) as id_two
from dual;

ID_ONE                 ID_TWO                 
---------------------- ---------------------- 
2                      3                      


-- 3) This is the problematic case: I want to return the same ID two times:
select my_id as id
     , my_id as same_id
 from (select xxx_test_pkg.get_id(1) as my_id from dual);

ID                     SAME_ID                
---------------------- ---------------------- 
4                      5                      


-- 4) CURVAL on these sequence does not work:
select my_id as id
     , xxx_test_seq.curval as same_id
 from (select xxx_test_pkg.get_id(1) as my_id from dual);

SQL Error: ORA-00904: "XXX_TEST_SEQ"."CURVAL": invalid identifier


-- 5) This gives the output that I need, but why?
select my_id as id
     , xxx_test_seq.nextval as same_id
 from (select xxx_test_pkg.get_id(1) as my_id from dual);
 
ID                     SAME_ID                
---------------------- ---------------------- 
7                      7                     
Query 3 is one who gives me headaches. I need to return the same ID in different columns. But it returns only two different pieces of identification. I know that the optimizer will merge the two select statements into one and therefore perform the function twice. Someone knows how can I avoid this?

Which is a little strange to me, it's the query 5 is really what I need, but at first glance I would say that he should not do. I would say that using nextval would be me again another number sequence.

It's confusing... Can someone explain this and advise how can I build a query if I can get the same ID twice by line?


I know that I can totally get rid of the sequence in my function and use something different, but I was wondering if I can avoid to change my function.


Thank you
David.

Oracle's FUSION query inline with the outer query block, which causes the function being called twice.

Instead of MATERIALIZING suspicion, or relying on ROWNUM = 1 effect predicate aside, I would explicitly tell the optimizer to not do so via the NO_MERGE indicator.

select my_id as id
     , my_id as same_id
from (select /*+ NO_MERGE */ xxx_test_pkg.get_id(1) as my_id from dual);

Tags: Database

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