The 11g trigger compile errors

Using the 11g Win 2008 Server 64 bit. I am trying to create a trigger that willl automatically calculate the total cost of an item of the requested quantity multiplied by unit cost. The trigger is used to bypass user input if the cost toal of an element is empty. I tried the following syntax variations and would appreciate advice on the proper syntax to use. Thank you, J


CREATE OR REPLACE TRIGGER prodreq_qtycalc
AFTER INSERT ON PRODUCT_REQUIREMENTS
FOR EACH LINE
BEGIN
IF: OLD. TOTALCOST IS NULL
THEN UPDATE PRODUCT_REQUIREMENTS
SET: NEW. TOTALCOST = (UNITCOST * QTYNEEDED);
END;

Jay wrote:
Using the 11g Win 2008 Server 64 bit. I am trying to create a trigger that willl automatically calculate the total cost of an item of the requested quantity multiplied by unit cost. The trigger is used to bypass user input if the cost toal of an element is empty. I tried the following syntax variations and would appreciate advice on the proper syntax to use. Thank you, J

CREATE OR REPLACE TRIGGER prodreq_qtycalc
AFTER INSERT ON PRODUCT_REQUIREMENTS
FOR EACH LINE
BEGIN
IF: OLD. TOTALCOST IS NULL
THEN UPDATE PRODUCT_REQUIREMENTS
SET: NEW. TOTALCOST = (UNITCOST * QTYNEEDED);
END;

As a general rule, it's a BAD design to store the value calculated online.

What happens if UNITCOST or QTYNEEDED is NULL?

  1  CREATE OR replace TRIGGER prodreq_qtycalc
  2    before INSERT ON product_requirements
  3    FOR each ROW
  4    WHEN (old.totalcost IS NULL)
  5  DECLARE
  6  BEGIN
  7      :NEW.totalcost := ( :old.unitcost * :old.qtyneeded );
  8* END prodreq_qtycalc;
SQL> /

Trigger created.

Tags: Database

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