Triggers to update one column on 3 tables

Question

hi,
I've three tables:
TABLE TN:
COD_ID.........VARCHAR2(32) primary key
NAME...........VARCHAR2(64) NOT NULL
COD_ID..............NAME
A12.................AT32
A13.................AT33
A14.................AT35
A30.................AT32
TABLE TM:
ID_X..........VARCHAR2(32) PRIMARY KEY
NAME..........VARCHAR2(64)
ID_X..............NAME
A12
A13
A14
A30
TABLE TL:
COD_ID..........VARCHAR2(32) FOREIGN KEY ON TN
ID_X............VARCHAR2(32) FOREIGN KEY ON TM
TL_ID...........VARCHAR2(32) PRIMARY KEY
NAME............VARCHAR2(64)
I'd like to create triggers (or procedure) that update automatically the value NAME in the tables TM and TL.
for example:
If I insert into TN a new COD_ID (A39) and a new NAME (AT38), when I insert a new ID_X in tble TM, I'd like
to have the value AT38 in NAME of TM, and when I insert a new record in table TL I'd like
to have the value AT38 in NAME of TL.
Also when I update NAME of TN.
I tried with these triggers:
CREATE OR REPLACE TRIGGER TN_PR_BEFORE_UPD
BEFORE UPDATE OF NAME ON TL
FOR EACH ROW
DECLARE
tmpVar NUMBER;
BEGIN
update TL set NAME=:new.NAME where TL.COD_id=:new.COD_id;
UPDATE TM SET NAME=:NEW.NAME WHERE ID_X=:NEW.COD_ID;
END TN_PR_BEFORE_UPD;
CREATE OR REPLACE TRIGGER TN_COD_ID
BEFORE UPDATE OF COD_ID ON TL
FOR EACH ROW
BEGIN
SELECT NAME INTO :NEW.NAME FROM TN WHERE TN.COD_ID=:NEW.COD_ID;
END TN_COD_ID;
CREATE OR REPLACE TRIGGER TL_pr
BEFORE UPDATE OF NAME ON TL
BEGIN
UPDATE TM SET NAME=:NEW.NAME WHERE ID_X=:NEW.ID_X AND :NEW.ID_X IS NOT NULL;
END TL_pr;
CREATE OR REPLACE TRIGGER TL_PR_BEFORE_INSERT
before INSERT ON TL
FOR EACH ROW
DECLARE
tmpVar varchar2(64);
BEGIN
SELECT NAME
into tmpVar
FROM TN
WHERE COD_ID=:NEW.COD_ID;
END TL_PR_BEFORE_INSERT;
when I update TN triggers run CORRECTLY but when I insert a new record in TM, TN, TL I don't see a new NAME.
What I wrong??
Thanks
Raf

Answer 1

Use when updating then insert into table_name
and
when inserting then insert into table_name
clauses in your Triggers to do this