Re: A table of magic constants
| От | Charles Clavadetscher |
|---|---|
| Тема | Re: A table of magic constants |
| Дата | |
| Msg-id | 00c301d0bc1e$8ce541e0$a6afc5a0$@swisspug.org обсуждение исходный текст |
| Ответ на | Re: A table of magic constants (Dane Foster <studdugie@gmail.com>) |
| Список | pgsql-general |
Hi Dane
There is a list of reserved keywords, including the ones that you mentioned.
http://www.postgresql.org/docs/9.5/static/sql-keywords-appendix.html
However you still need to search for their meaning.
Maybe it helps.
Bye
Charles
From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of Dane Foster
Sent: Samstag, 11. Juli 2015 22:56
To: Adrian Klaver
Cc: pgsql-general@postgresql.org
Subject: Re: [GENERAL] A table of magic constants
Hello Adrian,
Thank you for the additional reference links but my concern was less about how to find out what a function (formerly magic constant) that I encountered in the wild did but more about having a list that would educate newcomers/me about what is automatically available for use. For example, in the RLS example from my original message, had I the same or similar need as the poster I would not have been able to formulate the policy that I quoted because I had no clue that SESSION_USER even existed. Specifically I would not have been able to formulate the following clause, "... WITH CHECK (username = SESSION_USER)", w/o first knowing that SESSION_USER was a thing.
Regards,
Dane
On Sat, Jul 11, 2015 at 3:54 PM, Adrian Klaver <adrian.klaver@aklaver.com> wrote:
On 07/11/2015 12:21 PM, Raymond O'Donnell wrote:
On 11/07/2015 20:07, Dane Foster wrote:
<snip>As a recent convert to the Church of Postgres I've been consuming vast
Welcome to the One True Faith! :-)amounts of information on PostgreSQL, and SESSION_USER is not the first
nor only, what I'm calling magic constant, that I've seen. Off the top
of my head, other examples that I've encountered are CURRENT_USER and
CURRENT_TIMESTAMP.
So my question is this, is there a reference table in the documentation
that I haven't found yet that lists all magic constants and their
meaning? And if not in the official documentation is it in the wiki?
session_user, current_timestamp and current_user are all functions, not
magic constants:
http://www.postgresql.org/docs/9.4/static/functions-datetime.html
http://www.postgresql.org/docs/9.4/static/functions-info.html
I hope this helps,
To add to this. In the documentation section:
http://www.postgresql.org/docs/9.4/interactive/index.html
there is a Search box where you can enter the word/phrase you are looking for.
If all else fails there is the Index:
http://www.postgresql.org/docs/9.4/interactive/index.html
Ray.
--
Adrian Klaver
adrian.klaver@aklaver.com
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