Обсуждение: pg_service.conf and client support
Hello all
I just found out about the pg service file. https://www.postgresql.org/docs/current/libpq-pgservice.html
I don’t know why it took me so long finding this. I have been looking for ways to abstract physical details of data location away for clients (much like Oracle’s tnsnames).
Want to move a cluster to a new host. Sure, move it, edit pg_service.conf and clients will not know the difference.
It works great for at least psql and psycopg2.
But I cannot find anything on pg_service.conf and the Postgres ODBC driver and Npgsql for .Net
I know pg_service.conf support is implemented through libpq and support for rivers not using libpq is not a given thing.
But I think the need for the abstraction of connection details is a general one.
Can anyone shed som light on the ubiquitousness of support for pg_service.conf?
Are there any other mechanisms with broader support, that can be used instead of pg_service.conf (if support is scarce beyond what builds on libpq)?
Thank you.
Regards Niels Jespersen
On Saturday, June 13, 2020, Niels Jespersen <NJN@dst.dk> wrote:
Can anyone shed som light on the ubiquitousness of support for pg_service.conf?
AFAIK same non-support for JDBC and Node.js
Are there any other mechanisms with broader support, that can be used instead of pg_service.conf (if support is scarce beyond what builds on libpq)?
Not that I am aware, though programmatically accessed libraries are somewhat able to be adapted using custom wrappers so that the pg_service file contents can be leveraged.
David J.
On 6/13/20 10:03 PM, Niels Jespersen wrote: > Hello all > > I just found out about the pg service file. > https://www.postgresql.org/docs/current/libpq-pgservice.html > > I don’t know why it took me so long finding this. I have been looking > for ways to abstract physical details of data location away for clients > (much like Oracle’s tnsnames). > > Want to move a cluster to a new host. Sure, move it, edit > pg_service.conf and clients will not know the difference. > > It works great for at least psql and psycopg2. > > But I cannot find anything on pg_service.conf and the Postgres ODBC > driver and Npgsql for .Net > > I know pg_service.conf support is implemented through libpq and support > for rivers not using libpq is not a given thing. > > But I think the need for the abstraction of connection details is a > general one. > > Can anyone shed som light on the ubiquitousness of support for > pg_service.conf? > > Are there any other mechanisms with broader support, that can be used > instead of pg_service.conf (if support is scarce beyond what builds on > libpq)? Only thing I know of is something like pgbouncer(http://www.pgbouncer.org/) where you keep a constant connection setting for the pooler and then change the settings for the database(s) it connects to. > > Thank you. > > Regards Niels Jespersen > -- Adrian Klaver adrian.klaver@aklaver.com
On Sun, 2020-06-14 at 05:03 +0000, Niels Jespersen wrote: > I just found out about the pg service file. https://www.postgresql.org/docs/current/libpq-pgservice.html > > I don’t know why it took me so long finding this. I have been looking for ways to abstract physical details of data locationaway for clients (much like Oracle’s tnsnames). > > Want to move a cluster to a new host. Sure, move it, edit pg_service.conf and clients will not know the difference. > > It works great for at least psql and psycopg2. > > But I cannot find anything on pg_service.conf and the Postgres ODBC driver and Npgsql for .Net > > I know pg_service.conf support is implemented through libpq and support for rivers not using libpq is not a given thing. > > But I think the need for the abstraction of connection details is a general one. > > Can anyone shed som light on the ubiquitousness of support for pg_service.conf? You got it right: pg_service.conf is only used by libpq, so all clients that use libpq automatically support it. Other clients don't support it. For your examples that means: - The PostgreSQL ODBC server can use pg_service.conf - NpgSQL cannot use the file. Yours, Laurenz Albe -- Cybertec | https://www.cybertec-postgresql.com
-----Oprindelig meddelelse----- Fra: Laurenz Albe <laurenz.albe@cybertec.at> Sendt: 15. juni 2020 11:24 Til: Niels Jespersen <NJN@dst.dk>; pgsql-general@postgresql.org Emne: Re: pg_service.conf and client support On Sun, 2020-06-14 at 05:03 +0000, Niels Jespersen wrote: > I just found out about the pg service file. > https://www.postgresql.org/docs/current/libpq-pgservice.html > > I don’t know why it took me so long finding this. I have been looking for ways to abstract physical details of data locationaway for clients (much like Oracle’s tnsnames). > > Want to move a cluster to a new host. Sure, move it, edit pg_service.conf and clients will not know the difference. > > It works great for at least psql and psycopg2. > > But I cannot find anything on pg_service.conf and the Postgres ODBC > driver and Npgsql for .Net > > I know pg_service.conf support is implemented through libpq and support for rivers not using libpq is not a given thing. > > But I think the need for the abstraction of connection details is a general one. > > Can anyone shed som light on the ubiquitousness of support for pg_service.conf? You got it right: pg_service.conf is only used by libpq, so all clients that use libpq automatically support it. Other clientsdon't support it. For your examples that means: - The PostgreSQL ODBC server can use pg_service.conf - NpgSQL cannot use the file. Yours, Laurenz Albe -- Cybertec | https://www.cybertec-postgresql.com Thank you Laurenz You mention that the PostgreSQL ODBC driver can use pg_service.conf. But I cannot find any examples om how to construct aconnectionstring that PostgreSQL ODBC will accept? Regards Niels
On Mon, 2020-06-15 at 11:58 +0000, Niels Jespersen wrote: > > For your examples that means: > > - The PostgreSQL ODBC server can use pg_service.conf > > - NpgSQL cannot use the file. > > You mention that the PostgreSQL ODBC driver can use pg_service.conf. But I cannot > find any examples om how to construct a connectionstring that PostgreSQL ODBC will accept? After looking at the code, I am no longer sure. There doesn't seem to be a way to specify a general connection string. You could try setting the environment variable PGSERVICE to specify the service. Yours, Laurenz Albe -- Cybertec | https://www.cybertec-postgresql.com
Fra: Laurenz Albe <laurenz.albe@cybertec.at> Sendt: 15. juni 2020 15:36 Til: Niels Jespersen <NJN@dst.dk>; pgsql-general@postgresql.org Emne: Re: SV: pg_service.conf and client support On Mon, 2020-06-15 at 11:58 +0000, Niels Jespersen wrote: > > For your examples that means: > > - The PostgreSQL ODBC server can use pg_service.conf > > - NpgSQL cannot use the file. > > You mention that the PostgreSQL ODBC driver can use pg_service.conf. > But I cannot find any examples om how to construct a connectionstring that PostgreSQL ODBC will accept? After looking at the code, I am no longer sure. There doesn't seem to be a way to specify a general connection string. You could try setting the environment variable PGSERVICE to specify the service. Yours, Laurenz Albe -- Cybertec | https://www.cybertec-postgresql.com That is the way to do it. It works. Connectionstring 'Driver={PostgreSQL Unicode(x64)}' And environment variables PGSERVICEFILE and PGSERVICE Will connect you. Thank you for helping with this. Regards Niels