From: Dawid Kuroczko <qnex42@gmail.com>
To: Postgres General <pgsql-general@postgresql.org>
Cc: pgsql-sql <pgsql-sql@postgresql.org>
Subject: Scrolling cursors in PL/PgSQL
Date: Thu, 1 Nov 2007 21:19:44 +0100
Message-ID: <758d5e7f0711011319t5e752dsad6481d1427a46ff@mail.gmail.com> (raw)
Hello.
Is there a way to scroll a cursor from within PL/PgSQL?
I tried EXECUTE, but:
ERROR: cannot manipulate cursors directly in PL/pgSQL
HINT: Use PL/pgSQL's cursor features instead.
The idea would be that PL/pgsql function would look
through (all) query results, then rewind the cursor and
finally return it.
My fellow developers have created a function which run
the (complex) query twice (first a count(*) on the result
set, then return the row count and cursor to the results.
Then they created a version which uses temporary
table as a placeholder for the query results, and results
count and a pointer to select * from tmp_table.
Now I imagined a function which would open the cursor,
MOVE FORWARD ALL, then MOVE ABSOLUTE 0;
and return count and a cursor, yet it seems it won't work.
Any other idea how to efficiently solve such a problem?
Regards,
Dawid
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Subject: Re: Scrolling cursors in PL/PgSQL
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