Обсуждение: permanent setting of config variables
Hi,
I have a few PL/pgSQL functions that use queires like "SHOW company.product INTO _product_name" and "SHOW company.cluster INTO _cluster_number".
But these are failing because I don't know how to set those values on a permanent basis, or maybe on startup would also be ok.
I did read the "ALTER DATABASE " and the "set_config(...)" documentation and I experimented a bit with that but without succes.
So my question would be: how to permanently set user specific config values that would become accessible to the "SHOW ...." SQL comand.
Thank you
Joao
On Thu, 2021-02-18 at 09:09 +0000, Joao Miguel Ferreira wrote: > I have a few PL/pgSQL functions that use queires like "SHOW company.product INTO _product_name" and "SHOW company.clusterINTO _cluster_number". > But these are failing because I don't know how to set those values on a permanent basis, or maybe on startup would alsobe ok. > I did read the "ALTER DATABASE " and the "set_config(...)" documentation and I experimented a bit with that but withoutsucces. > So my question would be: how to permanently set user specific config values that would become accessible to the "SHOW ...."SQL comand. _product_name := current_setting('company.product'); Yours, Laurenz Albe -- Cybertec | https://www.cybertec-postgresql.com
Hi,
On Thu, Feb 18, 2021 at 10:52 AM Laurenz Albe <laurenz.albe@cybertec.at> wrote:
On Thu, 2021-02-18 at 09:09 +0000, Joao Miguel Ferreira wrote:
> I have a few PL/pgSQL functions that use queires like "SHOW company.product INTO _product_name" and "SHOW company.cluster INTO _cluster_number".
> But these are failing because I don't know how to set those values on a permanent basis, or maybe on startup would also be ok.
> I did read the "ALTER DATABASE " and the "set_config(...)" documentation and I experimented a bit with that but without succes.
> So my question would be: how to permanently set user specific config values that would become accessible to the "SHOW ...." SQL comand.
_product_name := current_setting('company.product');
I can not change the code in those functions. I need to make them work as they are.
So I guess I need to set those variables from an administration action rather than from a coding action.
Something like "ALTER SYSTEM SET company.procut TO 'SpaceCraft';" but this returns an error saying "ERROR: unrecognized configuration parameter "company.procut". If I'm not mistaken, the "SET ...." command lasts only for the duration of a client session. I need it to be permanent.
Yours,
Laurenz Albe
--
Cybertec | https://www.cybertec-postgresql.com
On Thu, 2021-02-18 at 11:42 +0000, Joao Miguel Ferreira wrote: > On Thu, Feb 18, 2021 at 10:52 AM Laurenz Albe <laurenz.albe@cybertec.at> wrote: > > On Thu, 2021-02-18 at 09:09 +0000, Joao Miguel Ferreira wrote: > > > I have a few PL/pgSQL functions that use queires like "SHOW company.product INTO _product_name" and "SHOW company.clusterINTO _cluster_number". > > > But these are failing because I don't know how to set those values on a permanent basis, or maybe on startup wouldalso be ok. > > > I did read the "ALTER DATABASE " and the "set_config(...)" documentation and I experimented a bit with that but withoutsucces. > > > So my question would be: how to permanently set user specific config values that would become accessible to the "SHOW...." SQL comand. > > > > _product_name := current_setting('company.product'); > > > > I can not change the code in those functions. I need to make them work as they are. That makes no sense. You say that the statements in your functions are failing. Then you *have* to change the code. > So I guess I need to set those variables from an administration action rather than from a coding action. Your question was about SHOW, not SET, so I have lost you here. > Something like "ALTER SYSTEM SET company.procut TO 'SpaceCraft';" but this returns > an error saying "ERROR: unrecognized configuration parameter "company.procut". > If I'm not mistaken, the "SET ...." command lasts only for the duration of a > client session. I need it to be permanent. These parameters do not exist, so you cannot set them permanently. That's the way it is. To turn them into parameters, you would have to write a small extension in C and load it into the server. Yours, Laurenz Albe -- Cybertec | https://www.cybertec-postgresql.com
On 2/18/21 4:09 AM, Joao Miguel Ferreira wrote: > I have a few PL/pgSQL functions that use queires like "SHOW company.product INTO > _product_name" and "SHOW company.cluster INTO _cluster_number". > > But these are failing because I don't know how to set those values on a > permanent basis, or maybe on startup would also be ok. > > I did read the "ALTER DATABASE " and the "set_config(...)" documentation and I > experimented a bit with that but without succes. > > So my question would be: how to permanently set user specific config values that > would become accessible to the "SHOW ...." SQL comand. Perhaps I don't understand your issue, but this works for me: 8<--------------- nmx=# alter database nmx set a.b = 'c'; ALTER DATABASE nmx=# \q psql nmx psql (12.5) Type "help" for help. nmx=# show a.b; a.b ----- c (1 row) CREATE OR REPLACE FUNCTION test() RETURNS text AS $$ DECLARE pn text; BEGIN SHOW a.b INTO pn; RETURN pn; END; $$ LANGUAGE plpgsql; nmx=# SELECT test(); test ------ c (1 row) nmx=# \q psql nmx psql (12.5) Type "help" for help. nmx=# SELECT test(); test ------ c (1 row) 8<--------------- HTH, Joe -- Crunchy Data - http://crunchydata.com PostgreSQL Support for Secure Enterprises Consulting, Training, & Open Source Development
Вложения
Hi,
On Thu, Feb 18, 2021 at 4:05 PM Joe Conway <mail@joeconway.com> wrote:
On 2/18/21 4:09 AM, Joao Miguel Ferreira wrote:
> I have a few PL/pgSQL functions that use queires like "SHOW company.product INTO
> _product_name" and "SHOW company.cluster INTO _cluster_number".
>
> But these are failing because I don't know how to set those values on a
> permanent basis, or maybe on startup would also be ok.
>
> I did read the "ALTER DATABASE " and the "set_config(...)" documentation and I
> experimented a bit with that but without succes.
>
> So my question would be: how to permanently set user specific config values that
> would become accessible to the "SHOW ...." SQL comand.
Perhaps I don't understand your issue, but this works for me:
8<---------------
nmx=# alter database nmx set a.b = 'c';
ALTER DATABASE
nmx=# \q
psql nmx
psql (12.5)
Type "help" for help.
nmx=# show a.b;
a.b
-----
c
(1 row)
I have just tried your example and it worked just fine.
I guess I was doing something wrong on my previous attempts.
And also, from your example, it also means that this can be achieved by the client application, which is also cool, and better for me than the server side approach
Thank you for the clear example
Joao
CREATE OR REPLACE FUNCTION test() RETURNS text AS $$
DECLARE
pn text;
BEGIN
SHOW a.b INTO pn;
RETURN pn;
END;
$$ LANGUAGE plpgsql;
nmx=# SELECT test();
test
------
c
(1 row)
nmx=# \q
psql nmx
psql (12.5)
Type "help" for help.
nmx=# SELECT test();
test
------
c
(1 row)
8<---------------
HTH,
Joe
--
Crunchy Data - http://crunchydata.com
PostgreSQL Support for Secure Enterprises
Consulting, Training, & Open Source Development