refer to stored proc output param in macro? - teradata

Question

Is there a way to refer to an output parameter of a stored procedure in a macro?
My stored procedure is:
CREATE PROCEDURE db.ssis_load_nextID
(IN tbl VARCHAR(30), OUT nextID SMALLINT )
BEGIN
DECLARE maxID SMALLINT;
SELECT MAX(loadID) INTO maxID
FROM db.SSIS_Load
WHERE TABLENAME = tbl
GROUP BY TABLENAME;
IF maxID IS NULL THEN
SET nextID = 1;
ELSE
SET nextID = maxID + 1;
END if;
END;
I want to refer to this result in a macro like:
CREATE MACRO db.tbSTG_m AS (
INSERT INTO db.tbProd (ID1, ID2, f1, f2, ..., fn, loadID)
SELECT ID1, ID2, f1, f2,..., fn,
CALL db.ssis_Load_nextID('tbProd',nextID)
FROM db.tbstg
; );
because running CALL db.ssis_Load_nextID('tbProd',nextID) returns the result I want in the first (only) row of the first (only) column.
I tried storing the result in a variable in the macro, but apparently, that's unsupported.
Also, I'd like to start with an empty SSIS_load table, so it creates the first row when the first table is loaded, instead of pre-populating the load table before the automated load process starts.
All help appreciated,
-Beth
fyi, We got it to work by removing the 'group by tablename' clause and embedding the sp in the macro:
CREATE MACRO db.tbSTG_m AS (
INSERT INTO db.tbProd
SELECT ID1, ID2, f1, f2, ..., fn (
SELECT ZEROIFNULL(MAX(loadID))+1
FROM db.ssis_load
WHERE TABLENAME = 'tbStg') mx
FROM db.tbSTG;
);

Answer 1

You can't use a stored proc for that (you would have to use a UDF not a procedure)
however you can do it in your macro
syntax may not be 100% correct.. working from memory but should get you close
I am assuming tbl is a parameter passed in correct?
basically you join to the id table and use that in your insert...
then you update the id table with the maximum freshly inserted ids
CREATE MACRO db.tbSTG_m AS (
INSERT INTO db.tbProd (ID1, ID2, f1, f2, ..., fn, loadID)
SELECT ID1, ID2, f1, f2,..., fn, MAXloadID + SUM(1) OVER(ROWS UNBOUNDED PRECEDING)
FROM db.tbstg
cross join (SELECT MAX(loadID) as MAXloadID
FROM db.SSIS_Load
WHERE TABLENAME = tbl
GROUP BY TABLENAME) as IDGEN
;
update db.SSIS_Load from (select MAX(loadID) as MAXloadID from tbl) as upid
set loadID = upid.MAXloadID
where db.SSIS_Load.TABLENAME = tbl
);