Log Table History With Trigger

Question

Hello,
I'm trying to log all changes on a table in a second table with a trigger.
This is my code:
CREATE OR REPLACE
TRIGGER TRG_INS_ROTOKOLL
AFTER INSERT ON vertraege
FOR EACH ROW
REFERENCING OLD AS alt NEW AS neu
BEGIN
INSERT INTO vertraege_protokoll SELECT * FROM vertraege vt WHERE vt.id = :NEW.id;
END;
Does anybody know why I get an "invalid trigger" - error (ORA-04079)?
Does anybody know a better method to solve this problem?
Thanks in advance -
Timo Paschke

Answer 1

There is nothing wrong
REFERENCING OLD AS alt NEW AS neu
but the FOR EACH ROW must be placed at the
end.
CREATE OR REPLACE TRIGGER TRG_INS_ROTOKOLL
AFTER INSERT ON emp REFERENCING OLD AS alt NEW AS neu
FOR EACH ROW
BEGIN
END;
** Then you will encounter trigger mutation , because
your are selecting from the same table.
instead you can directly insert data into your new
table with your :neu values
insert into vertraege_protokoll values (
:neu.<colname>,:neu.<colname>,:neu.<colname>,..);
-S.KTo me ?
REFERENCING OLD AS alt NEW AS neu,
will cause problems as he is using :NEW in the trigger body.
After noting that I found the trigger is completely wrong.So recommended to read docs..