Re: parsing SQLERRM ?

david.sahagian@emc.com wrote:
> (version == 9.1)
>
> In my PL/pgSQL stored functions,
> I want to be able to distinguish which FK-constraint caused the
[foreign_key_violation] exception.
>   . . .
>   BEGIN
>     delete from MY_COOL_TABLE where id = 123 ;
>   EXCEPTION
>     WHEN foreign_key_violation THEN
>       CASE
>         WHEN (SQLERRM tells me it blew up because of FK X)  THEN . . .
;
>         WHEN (SQLERRM tells me it blew up because of FK Y)  THEN . . .
;
>         WHEN (SQLERRM tells me it blew up because of FK Z)  THEN . . .
;
>       END;
>     WHEN others THEN
>       raise;
>   END;
>   . . .
>
> Is a "robust enough" parsing of SQLERRM actually the best/only way to
determine this ?

I think so.

Not that it is particularly nice, though.  It should be fairly robust to
search for the name of the constraint in the error message.

Yours,
Laurenz Albe