Обсуждение: BUG #2542: ALTER USER foo SET bar = func(baz) errors out

The following bug has been logged online:

Bug reference:      2542
Logged by:          David Fetter
Email address:      david@fetter.org
PostgreSQL version: All
Operating system:   All
Description:        ALTER USER foo SET bar = func(baz) errors out
Details:

foo=> ALTER USER foo SET search_path = current_setting('search_path');
ERROR:  syntax error at or near "(" at character 52
LINE 1: ...LTER USER foo SET search_path = current_setting('search_p...

is there some way to let the right hand side of SET be the (TEXT) output of
a function?

"David Fetter" <david@fetter.org> writes:
> is there some way to let the right hand side of SET be the (TEXT) output of
> a function?

No.  SET is a utility command and utility commands generally don't do
expression evaluation.  (There are some specific reasons why not for
SET, but I won't get into that here.)

However, you can get the desired effect in various other ways; see the
set_config() function, or try updating the pg_settings view ...

            regards, tom lane

On Thu, Jul 20, 2006 at 10:46:27PM -0400, Tom Lane wrote:
> "David Fetter" <david@fetter.org> writes:
> > is there some way to let the right hand side of SET be the (TEXT)
> > output of a function?
>
> No.  SET is a utility command and utility commands generally don't
> do expression evaluation.  (There are some specific reasons why not
> for SET, but I won't get into that here.)
>
> However, you can get the desired effect in various other ways; see
> the set_config() function, or try updating the pg_settings view ...

foo=> UPDATE pg_catalog.pg_settings SET setting = 'bar,' || setting
WHERE "name"='search_path';
-[ RECORD 1 ]----------------
set_config | bar,$user,public

That's a neat trick :)

However:

psql foo foo
foo=> SHOW search_path ;
 search_path
--------------
 $user,public
(1 row)

How do I make it permanent?

Cheers,
D
--
David Fetter <david@fetter.org> http://fetter.org/
phone: +1 415 235 3778        AIM: dfetter666
                              Skype: davidfetter

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