From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Joseph Adams <joeyadams3(dot)14159(at)gmail(dot)com> |
Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Working with PostgreSQL enums in C code |
Date: | 2010-05-28 11:17:23 |
Message-ID: | AANLkTinsBwZLMoPF3Yq_Xzrav5dfYgKamKXggyO71m6H@mail.gmail.com |
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On Fri, May 28, 2010 at 12:07 AM, Joseph Adams
<joeyadams3(dot)14159(at)gmail(dot)com> wrote:
> I learned that to return an enum value from C, one needs to return the
> OID of the right row of the pg_enum table. I eventually managed to
> write the code below, which is mostly based on the enum_in function in
> src/backend/utils/adt/enum.c .
PG_RETURN macros shouldn't do any nontrivial processing (see the
existing ones for references). I assume you have the enum labels
declared in pg_enum.h, so I think you can just return the correct OID
values directly. Declare constants for them in pg_enum.h and then
just do PG_RETURN_OID(whatever).
#define JSONTypeNullOid ...
#define JSONTypeStringOid ...
#define JSONTypeNumberOid ...
It really shouldn't be necessary to do a catalog lookup to retrieve a constant.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise Postgres Company
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