SQL to determine if column is updated

[Charisse Lane]

I have a trigger (see below) that works to compare my headline column without any problems. I need to modify this trigger however because I also need to check whether or not another column (content_body) has been updated. I do NOT need to compare the actual values of the before and after of the content_body but rather use the columns_updated() or if update (content_body) to determine if the field was updated - even if set to the same value.

What is the best way for me to add this to my existing trigger? I would rather not create a new trigger against the same table because I'm afraid this may cause a trigger conflict. If not, please let me know.

Also, I'm open to using a stored procedure that I can call from my Java code base if you think that's a better approach. This stored proc would need to perform the same function as the trigger.


CREATE OR REPLACE TRIGGER TRG_ART_DT
AFTER UPDATE ON csp_tbl_article
REFERENCING NEW AS N OLD AS O
FOR EACH ROW
WHEN (N.headline != O.headline )
BEGIN
UPDATE CSP_TBL_LASTMOD SET last_mod_date = sysdate
where content_guid=:N.vgn_guid;
END TRG_ART_DT;
/

I tried to modify as follows but it's not working:

CREATE OR REPLACE TRIGGER TRG_ART_DT
AFTER UPDATE ON csp_tbl_article
REFERENCING NEW AS N OLD AS O
FOR EACH ROW
WHEN ( (N.headline != O.headline) OR (update (content_body) ) )
BEGIN
UPDATE CSP_TBL_LASTMOD SET last_mod_date = sysdate
where content_guid=:N.vgn_guid;
END TRG_ART_DT;
/