There is almost always a problem when creating an SQL trigger and the trigger's file is in use. I found out that using a UDF to do the required computation makes this process much easier. Exclusive lock of trigger file is needed only once. Later you can test and change your UDF without any need to recreate the trigger program -- in the foll.
Example lot no in FSO file is determined after an allocation is created in ECL file. This logic is entered into the trigger program, which calls the nextlot() UDF for newlot value.
Code
** Beginning of Data ******************************
CREATE TRIGGER LOV64MMO/ELAWOTRGR
AFTER INSERT ON V604MMF/ELA
REFERENCING NEW AS N
FOR EACH ROW MODE DB2ROW
WHEN (SUBSTR(N.ALOT,10,1) BETWEEN 'A' AND 'Z'
AND N.ATYPE = 'S' AND N.LQALL > 0 )
BEGIN
DECLARE REF CHAR(5);
SET REF = (SELECT IREF05 FROM IIM WHERE IPROD = N.APROD);
IF REF ='MAIN' THEN
UPDATE V604MMF/FSO
SET SOLOT = NEXTLOT(N.ALOT),
SOPLOT = '1'
WHERE SORD = N.AORD AND SOFAC = 'R1';
END IF;
END
** End of Data ******************************
CREATE FUNCTION QGPL/NEXTLOT
(ILOT CHAR(10))
RETURNS CHAR (10)
LANGUAGE SQL
BEGIN
DECLARE ICHR CHAR(1);
DECLARE MCHR CHAR(1);
DECLARE NCHR CHAR(1);
DECLARE MLOT CHAR(10);
DECLARE NLOT CHAR(10);
SET ICHR = SUBSTR(ILOT,10,1);
IF ICHR BETWEEN 'A' AND 'Z' THEN
SET MLOT = (SELECT MAX(LLOT) FROM ILNL01
WHERE SUBSTR(LLOT,1,9) = SUBSTR(ILOT,1,9));
SET MCHR = SUBSTR(MLOT,10,1);
SET NCHR = TRANSLATE(MCHR,'BCDEFGHIJKLMNOPQRSTUVW',
'ABCDEFGHIJKLMNOPQRSTUV');
SET NCHR = TRANSLATE(MCHR,'BCDEFGHIJKLMNOPQRSTUVW',
'ABCDEFGHIJKLMNOPQRSTUV');
SET NLOT = SUBSTR(ILOT,1,9) CONCAT NCHR;
END IF;
RETURN NLOT;
END
***************************** End of Data ***************************
==================================
MORE INFORMATION ON THIS TOPIC
==================================
The Best Web Links: tips, tutorials and more.
Ask your programming questions--or help out your peers by answering them--in our live discussion forums.
Ask the Experts yourself: Our application development gurus are waiting to answer your programming questions.
