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Re: plpgsql - Insert from a record variable?

From: "Riccardo G(dot) Facchini" <abief_ag_-postgresql(at)yahoo(dot)com>
To: Phil Endecott <spam_from_postgresql_sql(at)chezphil(dot)org>,pgsql-sql(at)postgresql(dot)org
Subject: Re: plpgsql - Insert from a record variable?
Date: 2004-06-19 06:03:30
Message-ID: 20040619060330.83941.qmail@web13901.mail.yahoo.com (view raw or flat)
Thread:
Lists: pgsql-sql
--- Phil Endecott <__> wrote:
> Dear Postgresql experts,
> 
> I'm writing a simple plpgsql function that selects a row from a
> table, modifies it slightly, and inserts the modified version.  This
> sounds simple, but I can't find how to do the insert in a simple
> generic fashion: although SELECT has a form that puts the result in a
> record variable, INSERT doesn't seem to have anything similar.
> 
> What I'd like to be able to write is something like this:
> 
> DECLARE
>   R RECORD;
> BEGIN
>   SELECT * INTO R FROM TABLE WHERE id=n;
>   R.something := x;
>   INSERT INTO TABLE R;
> END

I'm not sure if it will work, but have you tried either two of these
forms?
--
declare r record;

begin
  select * into r from table where id = n;
  r.something := x;
  insert into table select r;
end;
--
declare r record;

begin
  select * into r from table where id = n;
  r.something := x;
  insert into table select r.*;
end;

> 
> But as far as I can see the only syntax that is allowed for INSERT is
> the normal INSERT INTO TABLE (x,y,z) VALUES (a,b,c).  To achieve what
> I want to do I'd need to iterate over the fields of the record (how?)
> and build up the string of the INSERT query.
> 
> It seems odd that SELECT can use a record variable but INSERT can't,
> so I wonder if I have missed something.  Any suggestions?
> 
> Thanks in advance for any help anyone can offer.
> 
> Regards,
> 
> --Phil.
> 
> ---------------------------(end of
> broadcast)---------------------------
> TIP 7: don't forget to increase your free space map settings

regards,



=====
Riccardo G. Facchini

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