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Oracle: Trigger to capture table updates

Posted on 2006-06-22
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Last Modified: 2008-01-09
I'd like to write a trigger that will capture updates made to a certain column of a table, and place the old and new values into another table.

Cost_Table
Product:    Watch
Price:       200

If the price of the watch is changed to 300, a row should be inserted into Cost_Table_Updates as follows:
Product:   Watch
Old_Price: 200
New_Price: 300

Thanks!
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Question by:TotalEnergy
2 Comments
 
LVL 25

Accepted Solution

by:
jrb1 earned 2000 total points
ID: 16963748
create or replace trigger
   Cost_Table_Updates
after update on cost_table
for each row

BEGIN
   IF UPDATING ('PRICE') THEN
      INSERT INTO Cost_Table_Updates (product, old_price, new_price)
         VALUES (:new.product, :old.price, :new.price);
   END IF;
END;
/
0
 
LVL 3

Expert Comment

by:hardikbeit
ID: 16966514
Trigger:

Create or Replace Trigger Update_Cost_watch
AFTER update ON cost_table --Before or after as per your requirement
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW

BEGIN
  IF UPDATING THEN
    IF :NEW.PRICE=300 THEN
        INSERT INTO Cost_Table_Updates(product, old_price, new_price)
        VALUES (:new.product_id, :Old.Price,:NEW.Price);
    END IF;
  END IF;
END;

This helps you.

Regards, Hardik
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