From: Christoph Haller <ch@rodos.fzk.de>
To: Andreas Kretschmer <akretschmer@despammed.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: how many tuples on a cursor?
Date: Mon, 02 May 2005 13:17:11 +0200
Message-ID: <42760C37.BD6531A8@rodos.fzk.de> (raw)
References: <20050502071358.GB5962@webserv.wug-glas.de>
Andreas Kretschmer wrote:
>
> Hello,
>
> I want to know how many tuples there on a cursor, and i found
> http://groups.google.de/groups?hl=de&lr=&threadm=3ACA7BB0.7020106%402cactus.com&rnum=7&a...
>
> But, this posting is very old (2001-04-03), i'm using 7.4.6.
>
> Is there now a way to get the total number of rows in a CURSOR?
>
> Andreas
> --
Assuming you are using the libpq interface,
after FETCH ALL you'll get the number of rows
by PQntuples().
What else seems to work is MOVE 2147483647
(INT_MAX) and then get the max number of rows
by PQcmdTuples().
Back to the beginning by FETCH ABSOLUTE 0.
But I have no idea how expensive this MOVE is.
Regards, Christoph
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Subject: Re: how many tuples on a cursor?
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