Обсуждение: Trigger

I have created the following function:

CREATE OR REPLACE FUNCTION validate_tag_number()
    RETURNS OPAQUE AS '
    BEGIN
    IF new.tag_number=old.tag_number THEN
    RAISE EXCEPTION " number is already present";
    END IF;
    RETURN NEW;
    END;
    'LANGUAGE 'plpgsql';

 I used it to create a trigger as follows;

    CREATE TRIGGER  validate_tag_number BEFORE UPDATE ON tag_vendor FOR EACH ROW
    EXECUTE PROCEDURE validate_tag_number();

If I do an update with a tag_number that does not exist everything is fine.
If  I do an update with a preexisting number I get the following messages-
NOTICE: plpgsql:ERROR during compile of validate_tag_number line 3
ERROR: unterminated " in name "
I was expecting to get the "number is already present" error messsage.
Where is my error?

    Thank you
    Adrian Klaver

On Thu, 28 Nov 2002, Adrian Klaver wrote:

>       RAISE EXCEPTION " number is already present";

Try it as under

        RAISE EXCEPTION ''number is already present'';

Tariq Muhammad
Liberty RMS
tariq@libertyrms.info
v:416-646-3304 x 111
c:416-993-1859
p:416-381-1457

On Thursday 28 November 2002 01:04 pm, Tariq Muhammad wrote:
Thank you. By focusing on the quotes you made me realize I was using double
quotes instead of escaped single quotes.
> On Thu, 28 Nov 2002, Adrian Klaver wrote:
> >       RAISE EXCEPTION " number is already present";
>
> Try it as under
>
>         RAISE EXCEPTION ''number is already present'';
>
> Tariq Muhammad
> Liberty RMS
> tariq@libertyrms.info
> v:416-646-3304 x 111
> c:416-993-1859
> p:416-381-1457
>
>
>
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