From: Christoph Haller <ch@rodos.fzk.de>
To: cstotes@hotmail.com
Cc: pgsql-sql@postgresql.org
Subject: Re: create type input and output function examples
Date: Tue, 04 Nov 2003 11:18:55 MET
Message-ID: <200311041018.LAA19497@rodos> (raw)
In-Reply-To: <BAY9-F45nXagRgsPLni00070b92@hotmail.com>
>
> I've seen the docs for create type and an example of the syntax to create a
> type. What I haven't seen is the functions that are passed for the input and
> output elements.
>
> CREATE TYPE box (INTERNALLENGTH = 8,
> INPUT = my_procedure_1, OUTPUT = my_procedure_2);
>
> Now what would be in my_procedure1 and my_procedure2 procedures? I know they
> are just example placeholders above but I need to see a real example of what
> would be in those procedures to better understand what they should do.
> Thanks.
>
Pretty late reply, hopefully not too late.
My understanding is these procedures are C functions.
For examples do the following:
List the types already in use and their io-functions as
select typname, typinput, typoutput from pg_type ;
Then search the source code (*.c files)
for <typinput> resp. <typoutput>
There is a box type already.
It's box_in and box_out functions can be found in
$PGSQLD/src/backend/utils/adt/geo_ops.c
HTH
Regards, Christoph
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To: pgsql-sql@postgresql.org
Cc: ch@rodos.fzk.de, cstotes@hotmail.com
Subject: Re: create type input and output function examples
In-Reply-To: <200311041018.LAA19497@rodos>
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