Обсуждение: Way to identify the current session's temp tables within pg_class ?

On Mon, Aug 25, 2014 at 7:48 PM, Marc Mamin <M.Mamin@intershop.de> wrote:
> Hello,
>
> When different sessions create temp tables with the same name:
> How can I identify the oid of the one created within the current session ?

You can use pg_my_temp_schema for this purpose. It returns the OID of
the schema where temporary objects are stored for a given session.
Note that this returns InvalidOid if no temporary objects are defined.
Here is an example:
=# select pg_my_temp_schema();
 pg_my_temp_schema
-------------------
                 0
(1 row)
=# create temp table aa (a int);
CREATE TABLE
=# SELECT nspname FROM pg_namespace WHERE oid = pg_my_temp_schema();
  nspname
-----------
 pg_temp_4
(1 row)

Regards,
--
Michael

> -----Original Message-----
> From: Michael Paquier [mailto:michael.paquier@gmail.com]
> On Mon, Aug 25, 2014 at 7:48 PM, Marc Mamin <M.Mamin@intershop.de>
> wrote:
> > Hello,
> >
> > When different sessions create temp tables with the same name:
> > How can I identify the oid of the one created within the current
> session ?
>
> You can use pg_my_temp_schema for this purpose. It returns the OID of
> the schema where temporary objects are stored for a given session.
> Note that this returns InvalidOid if no temporary objects are defined.


thanks,

I've also notice that ::regclass only returns the oid of the "accessible" table.
It is sufficient for my need, although it doesn't tell whether the table is temporary or not:

    SELECT * FROM pg_class where oid='foo'::regclass

regards,

marc


> Here is an example:
> =# select pg_my_temp_schema();
>  pg_my_temp_schema
> -------------------
>                  0
> (1 row)
> =# create temp table aa (a int);
> CREATE TABLE
> =# SELECT nspname FROM pg_namespace WHERE oid = pg_my_temp_schema();
>   nspname
> -----------
>  pg_temp_4
> (1 row)
>
> Regards,
> --
> Michael