Getting Errors in PL/SQL - bad bind variable and encountered the symbol...

Question

CREATE OR REPLACE TRIGGER update_QOH
AFTER INSERT ON ORDERLINE
FOR EACH ROW
DECLARE
     QOH_PRODUCT PRODUCT.QOH%TYPE;
BEGIN
     SELECT QOH INTO QOH_PRODUCT FROM PRODUCT WHERE :old.product_no = :new.product_no;
     IF :new.QTY <= :old.QOH THEN
          QOH = :old.QOH - :new.QTY
     ELSE
          send_email(ord_no, 'Backorder');
          INSERT INTO BACKORDER (backorder_no_seq.NEXTVAL, :new.product_no, :new.qty, SYSDATE);
          INSERT INTO PRODVENDOR (po_no_seq.NEXTVAL, :new.vendor_no, :new.product_no, :new.vend_qty, :new.shipping_method, SYSDATE, NULL, NULL, NULL);
     END IF;
END;
Error(5,17): PLS-00049: bad bind variable 'OLD.QOH'
Error(6,7): PLS-00103: Encountered the symbol "=" when expecting one of the following: := . ( @ % ;
Error(6,9): PLS-00049: bad bind variable 'OLD.QOH'

Answer 1

Hi,
Welcome to the forum!
I see 4 mistakes:
851543 wrote:
CREATE OR REPLACE TRIGGER update_QOH
AFTER INSERT ON ORDERLINE
FOR EACH ROW
DECLARE
     QOH_PRODUCT PRODUCT.QOH%TYPE;
BEGIN
     SELECT QOH INTO QOH_PRODUCT FROM PRODUCT WHERE :old.product_no = :new.product_no;
     IF :new.QTY <= :old.QOH THEN
          QOH = :old.QOH - :new.QTY(1) The variable qoh isn't declared.
(2) Did you mean the assignment operator, :=, rather than the equality operator, = ?
(3) An assignment statement must end with a semi-colon.
     ELSE
          send_email(ord_no, 'Backorder');(4) The variable ord_no isn't declared.
          INSERT INTO BACKORDER (backorder_no_seq.NEXTVAL, :new.product_no, :new.qty, SYSDATE);
          INSERT INTO PRODVENDOR (po_no_seq.NEXTVAL, :new.vendor_no, :new.product_no, :new.vend_qty, :new.shipping_method, SYSDATE, NULL, NULL, NULL);
     END IF;
END;
/While you can reference :NEW and :OLD values in the trigger, it doesn't make any sense to reference the :OLD values. On an INSERT (which is the only time this trigger fires), all :OLD values are NULL.
>
Error(5,17): PLS-00049: bad bind variable 'OLD.QOH'
Error(6,7): PLS-00103: Encountered the symbol "=" when expecting one of the following: := . ( @ % ;
Error(6,9): PLS-00049: bad bind variable 'OLD.QOH'I don't believe the code you posted is causing these errors. Each of the errors mentioned above would cause a different message. Post the actual code and error messages.
Whenever you post a question, post all the code necessary for people to re-create the problem and test their ideas.
In this case, that means CREATE statements for any tables or sequences involved, INSERT statements for any tables that need rows (such as product) as they exist before the INSERT, some INSERT statements for orderline, and the contents of all the tables after each of those INSERTs.
Always say which version of Oracle you're using.