swethasivaram@gmail.com wrote:
> Hello all
>
> I have the following requirement:
>
> Before insert or update on a table tableA, I need to check if the value
> for fieldAtableA which is being inserted or updated in tableA is within
> the range specified by two values from another table tableB.
>
> I have a function which performs this check and returns me true if the
> value falls within the range or false if it doesnt.
>
> I want to have a trigger before insert or update on tableA which calls
> this function. How do I call this function from the trigger and how can
> I use the return value to either allow the insert/update or disallow
> it?
>
> Any suggestions will be greatly appreciated.
>
> Thanks
> Swetha

Swetha,
This looks like rather simple trigger:
CREATE OR REPLACE TRIGGER TableA$BI$ROW
BEFORE INSERT ON TableA
FOR EACH ROW
BEGIN
IF NOT MyFunction( :NEW.MyColumn ) THEN
RAISE_APPLICATION_ERROR( -20000,'Value '||:NEW.MyColumn||' is
out of range');
END IF;
END;

Please read :
http://download-east.oracle.com/docs...0/triggers.htm
http://download-east.oracle.com/docs...s_triggers.htm

HTH
Thomas Olszewicki
CPAS Systems Inc.