Обсуждение: libpq PQftype() to comprehend types?

Can someone tell me how I can use PQftype() or some other mechanism to
interpret a query result in terms of the data types of the columns?


I need to be able to tell what data type a given column is. The 6.3.2
manual says PQftype() returns an internal coding -- is this defined in a
header file I can access, or ... ?

thanks,
Michael

Michael Olivier <mo@local2me.com> writes:
> Can someone tell me how I can use PQftype() or some other mechanism to
> interpret a query result in terms of the data types of the columns?

The PQftype value is the OID of the row for the type in the system
pg_type catalog.  Try

    SELECT * FROM pg_type WHERE oid = <PQftype result>

BTW: oid's for the predefined types are consistent across installations,
but oid's for user-defined types are not (and shouldn't even be trusted
across a save/reload).

            regards, tom lane