From: | Volkan YAZICI <yazicivo(at)ttnet(dot)net(dot)tr> |
---|---|
To: | Andro <andromede(at)gmail(dot)com> |
Cc: | pgsql-interfaces(at)postgresql(dot)org |
Subject: | Re: PQftype() and Oid |
Date: | 2006-08-05 07:14:26 |
Message-ID: | 20060805071426.GA1404@alamut.tdm.local |
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Thread: | |
Lists: | pgsql-interfaces |
On Aug 04 04:38, Andro wrote:
> Oids are in pg_type catalog (server side) and src/include/catalog/pg_type.h
> (hard-wired).
>
> But what should we compare the Oid returned by PQftype() with?
> Let's say I want to check if column 1 is a VARCHAR, do I have to
>
> if (PQftype(res,1) == 1043)
> ...;
>
> ?
> Isn't there a kind of enum which we could rely on to find out types? What if
> Oids change in pg_type.h?
You can make another query on pg_type to learn OID of a specific type.
And then compare it with the returned one from PQftype(main_query_res).
Furthermore, I think this is the only reliable way of accomplising this
task. (IIRC, PHP PostgreSQL API does same too.) Otherwise, when you use
hard-wired headers (e.g. by including pg_type.h) what will you do when
related server has a custom type that isn't get shippied with the
PostgreSQL headers you included.
Regards.
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