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Re: 8.1, OID's and plpgsql

From: Jaime Casanova <systemguards(at)gmail(dot)com>
To: "Uwe C(dot) Schroeder" <uwe(at)oss4u(dot)com>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: 8.1, OID's and plpgsql
Date: 2005-12-01 18:24:20
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Lists: pgsql-generalpgsql-hackers
On 12/1/05, Uwe C. Schroeder <uwe(at)oss4u(dot)com> wrote:
> Hi everyone,
> in 8.1 by default tables have no OID's anymore. Since OID's are 4 byte it's
> probably a good idea to discourage the use of them (they produced a lot of
> trouble in the past anyways, particularly with backup/restores etc)
> Now there's the issue with stored procs. A usual construct would be to
> ...
> ...
> INSERT xxxxxx;
> SELECT .... oid=lastoid;
> ....
> ....
> Is there anything one could sanely replace this construct with?
> I personally don't think that using the full primary key is really a good
> option. Say you have a 3 column primary key - one being a "serial", the
> others for example being timestamps, one of them generated with "default"
> options. In order to retrieve the record I just inserted (where I don't know
> the "serial" value or the timestamp) I'd have to
> 1) store the "nextval" of the sequence into a variable
> 2) generate the timestamp and store it to a variable
> 3) generate the full insert statement and retain the other values of the
> primary key
> 4) issue a select to get the record.
> Personally I think this adds unneccessary overhead. IMHO this diminishes the
> use of defaults and sequences unless there is some easier way to retrieve the
> last record. I must be missing something here - am I ?
>        UC

If you are using a SERIAL in your PK, why you need the other two
fields? The serial will undoubtly identify a record?

you just retrieve the current value you inserted with currval

Jaime Casanova
(DBA: DataBase Aniquilator ;)

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