Does a call to a language handler provide a context/session, and somewhere to keep session data?

From: <david(at)andl(dot)org>
To: <pgsql-general-owner+M220479=david=andl(dot)org(at)postgresql(dot)org>, "'pgsql-general'" <pgsql-general(at)postgresql(dot)org>
Subject: Does a call to a language handler provide a context/session, and somewhere to keep session data?
Date: 2016-03-07 05:21:42
Message-ID: 003b01d17831$3e88fa30$bb9aee90$@andl.org
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Given that a language handler would be expected to be persistent, and to support concurrent (and reentrant) calls within a single database, is there a unique context or session identifier available?

Is there a place to store data, to be retrieved later in the same session?

Is there a place to store data (a cache?) that has been retrieved from the database for use by concurrent sessions using that database?

Regards
David M Bennett FACS

Andl - A New Database Language - andl.org

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