Re: regclass without error?

Tatsuo Ishii <ishii@postgresql.org> writes:
> Is there any way to use regclass without having ERROR?

> pgpool-II needs to find the oid from table name and for the purpose it
> issues something like "SELECT 'table_name'::regproc::oid". Problem is,
> if the table does not exist, an error occured and the transaction
> aborts. Ideally if the table does not exist, the SELECT returns 0
> (InvalidOid).

I don't think the cast should act that way, but I could see providing a
separate conversion function that returns 0 ... or perhaps better NULL
... if no match.
        regards, tom lane