Re: Any form of connection-level "session variable" ?

From: Erik Jones <erik(at)myemma(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: John McCawley <nospam(at)hardgeus(dot)com>, pgsql-general(at)postgresql(dot)org
Subject: Re: Any form of connection-level "session variable" ?
Date: 2007-01-04 20:01:08
Message-ID: 459D5D04.7050309@myemma.com
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Tom Lane wrote:
> John McCawley <nospam(at)hardgeus(dot)com> writes:
>
>> I think I got it:
>> CREATE FUNCTION new_get_emp_id() RETURNS INTEGER AS $$ select emp_id
>> from secureview.tbl_employee where username = (SELECT current_user) $$
>> LANGUAGE SQL IMMUTABLE;
>> I made the function immutable so it only calls it once, therefore no
>> longer requiring a call per-row.
>>
>
> Since it's obviously *not* immutable, this will come back to bite you
> sooner or later (probably sooner). Labeling it STABLE would be
> reasonable, although I'm not certain how much that helps you. Do you
> have indexes on the columns it's being compared to?
>
Besides, a temp table is pretty much a session variable.

--
erik jones <erik(at)myemma(dot)com>
software development
emma(r)

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