postgres-xc-developers Mailing List for Postgres-XC

On Feb 5, 2014, at 5:33 PM, Tatsuo Ishii <is...@po...> wrote:

> What about this?
> 
> SELECT count(*) from
> 	   (SELECT has_function_privilege('%s', 'pgxc_version(text)', 'execute')
> 	   WHERE EXISTS(SELECT * FROM pg_catalog.pg_proc AS p WHERE p.proname = 'pgxc_version')) AS s"

I don’t much care about permission, so I would just do

    SELECT TRUE
      FROM pg_catalog.pg_proc p
      JOIN pg_catalog.pg_namespace n ON p.pronamespace = n.oid
     WHERE nspname = 'pg_catalog'
       AND proname = 'pgxc_version';

Best,

David

Abbas,

Can you test this with 1.1? Perhaps we fixed this issue in the master which
means that it will be part of 1.2 beta that is planned for this month.

-- Ahsan


On Wed, Feb 5, 2014 at 10:03 PM, David E. Wheeler <da...@ju...>wrote:

> On Feb 4, 2014, at 10:18 PM, Abbas Butt <abb...@en...>
> wrote:
>
> > I had to change the insert query a little bit and had to do some dummy
> inserts in projects and changes too, but the query worked fine for me. BTW
> I tried on current master, I am not sure which version you are using to
> test.
>
> The 1.1 release.
>
> > Here are the queries I tried.
> >
> > After creating the three tables, I did
> >
> > insert into projects values('?', '?', DEFAULT, '?', '?');
> >
> > insert into changes values('?', '?', '?', '?', DEFAULT,  '?', '?',
> clock_timestamp(), '?', '?');
> >
> > INSERT INTO tags (tag_id, tag, project, change_id, note, committer_name,
> committer_email, planned_at, planner_name, planner_email)
> > SELECT tid, tg, proj, chid, n, name, email, at, pname, pemail FROM (
> VALUES ('?', '?', '?', '?', '?', '?', '?', clock_timestamp()::timestamptz,
> '?', '?')) i(tid, tg, proj, chid, n, name, email, at, pname, pemail) LEFT
> JOIN tags ON i.tid = tags.tag_id WHERE tags.tag_id IS NULL;
>
> On 1.1:
>
> dwheeler=# insert into sqitch.projects values('?', '?', DEFAULT, '?', '?');
> INSERT 0 1
> Time: 48.720 ms
> dwheeler=# insert into sqitch.changes values('?', '?', '?', '?', DEFAULT,
>  '?', '?', clock_timestamp(), '?', '?');
> INSERT 0 1
> Time: 43.704 ms
> dwheeler=# INSERT INTO sqitch.tags (tag_id, tag, project, change_id, note,
> committer_name, committer_email, planned_at, planner_name, planner_email)
> dwheeler=# INSERT INTO sqitch.tags (tag_id, tag, project, change_id, note,
> committer_name, committer_email, planned_at, planner_name, planner_email)
> dwheeler-# SELECT tid, tg, proj, chid, n, name, email, at, pname, pemail
> FROM ( VALUES ('?', '?', '?', '?', '?', '?', '?',
> clock_timestamp()::timestamptz, '?', '?')) i(tid, tg, proj, chid, n, name,
> email, at, pname, pemail) LEFT JOIN sqitch.tags ON i.tid = tags.tag_id
> WHERE tags.tag_id IS NULL;
> ERROR:  unexpected varno 6 in JOIN RTE 5
> Time: 4.064 ms
>
> Best,
>
> David
>
>
>
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-- 
Ahsan Hadi
Snr Director Product Development
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The Enterprise Postgres Company

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> PGXC Hackers,
> 
> What is the simplest way to tell if the server one has connected to is XC? Try to call pgxc_version()? `SHOW gtm_host`? Or is there something else to check, maybe something that doesn't throw an exception?

What about this?

SELECT count(*) from
	   (SELECT has_function_privilege('%s', 'pgxc_version(text)', 'execute')
	   WHERE EXISTS(SELECT * FROM pg_catalog.pg_proc AS p WHERE p.proname = 'pgxc_version')) AS s"

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese: http://www.sraoss.co.jp

On Feb 4, 2014, at 5:36 PM, Koichi Suzuki <koi...@gm...> wrote:

> Because XC didn't change libpq at all, I cannot find explicit way if
> you're connecting to PG or XC.   Even psql binary from PG works with
> XC.   I'd suggest to test if pgxc_class, pgxc_node and pgxc_nodegroup
> catalog is available, which are all XC specifyc.   To avoid name
> conflict (you can create table pgxc_class in PG), you can specify
> pgxc_class oid value, which will be release-specific though.

I don’t think I need to be *that* anal. If someone creates a table named pgxc_class in pg_catalog then the problem is theirs, IMHO.

Thanks,

David

On Feb 4, 2014, at 5:56 PM, Michael Paquier <mic...@gm...> wrote:

> How do you actually do for PG itself? Do you use PG_VERSION_NUM or similar?

I don’t. Previously I did not have to distinguish Postgres from anything else.

David