Question

I’ve create a trigger which work on 2 tables like this:
– when insert a new row on table A (GEDDFILES) then a number field on table B(GEDDIRS) will be increased.

Code is getting compiled without errors but it doesn’t work. the code is bellow:

CREATE OR REPLACE TRIGGER "A"."TRGMAJNRFIC" AFTER
INSERT ON "A"."GEDFILES" FOR EACH ROW DECLARE 
 wtmpnrfic number;

BEGIN 
 SELECT MAX(OBJNRFICHIERS) INTO wtmpnrfic from GEDDirs WHERE ID= :new.ID;
 UPDATE GEDDirs SET OBJNRFICHIERS = wtmpnrfic+1 WHERE ID=:new.id;
END;

Tables are normalized and PK from GEDDIRS(field ID) is FK in table GEDFILES (field ID)

I can’t figure out where is the problem, even is a little one.

The field OBJNRFICHIERS from table GEDFILES is null. Can be this a problem when i’m trying to increase it’s value?

Answer 1

i’ve resolved it. the problem was that the field OBJNRFICHIERS was null. the trigger code is bellow

CREATE OR REPLACE TRIGGER "A"."TRGMAJNRFIC" AFTER
INSERT ON "A"."GEDFILES" FOR EACH ROW DECLARE 
 wtmpnrfic number;

BEGIN 
 SELECT MAX(OBJNRFICHIERS) INTO wtmpnrfic from GEDDirs WHERE ID= :new.ID;
 IF wtmpnrfic IS NULL then wtmpnrfic :=0;
 ELSE wtmpnrfic := wtmpnrfic+1;
 UPDATE GEDDirs SET OBJNRFICHIERS = wtmpnrfic+1 WHERE ID=:new.id;
 END IF;
END;

thank you all for the suggestions, and also other suggestions are welcomed! +1 for all the answers