From: Mark Richardson <markmapo@yahoo.com>
To: pgsql-interfaces@postgresql.org
Subject: Re: DataType OID for PQexecParams-call in libpq
Date: Thu, 5 Aug 2004 13:22:29 -0700 (PDT)
Message-ID: <20040805202229.81960.qmail@web53309.mail.yahoo.com> (raw)
Tom Lane writes:
>>Gergely Czuczy <phoemix ( at ) harmless ( dot ) hu> writes:
>> please take a look at the documentation at
>> <http://www.postgresql.org/docs/7.4/static/libpq-exec.html;
>> at the point "PQftype", where it's said:
>> " The OIDs of the built-in data types are defined in the file
>> src/include/catalog/pg_type.h in the source tree."
>Also, you can get the OID on the fly, eg with
> SELECT oid FROM pg_type WHERE typname = ...
> For standard built-in types it's >okay to hard-wire OID values into your
> code, but if you want to be able to deal with user-defined types you
> shouldn't rely on the OID being constant.
> regards, tom lane
The pg_type.h file has all sorts of other stuff in it - so including it while coding a client I makes a mess - I would like to have access to the "standard" values (especially since OID's are used in the libpq C interface for select). So, the select statement "select oid from pg_type where typename=.." can't be processed because you need to know the oid of the value coming back from that select statement (never ending loop!). I would love to see something like pg_oid_type.h that is something like this..
enum OID_TYPES
{
BOOLOID=16,
BYTEAOID=17,
CHAROID=18,
...
}
so that its easy to get the value of a specific oid, but you can also type cast easily (or have an array of the OID_TYPES). I know this doesn't handle the user defined types, but I think it would be very helpfull (or some defines for the pg_type.h file so that we can get just the oids, and not everything else for a client).
My 2 cents
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To: pgsql-interfaces@postgresql.org
Cc: markmapo@yahoo.com
Subject: Re: DataType OID for PQexecParams-call in libpq
In-Reply-To: <20040805202229.81960.qmail@web53309.mail.yahoo.com>
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