From: Alvaro Herrera <alvherre@alvh.no-ip.org>
To: rir <rirans@comcast.net>
Cc: Laurenz Albe <laurenz.albe@cybertec.at>
Cc: pgsql-docs@lists.postgresql.org
Subject: Re: small patch
Date: Thu, 7 Oct 2021 17:18:49 -0300
Message-ID: <202110072018.yugknob35ubc@alvherre.pgsql> (raw)
In-Reply-To: <20211007200612.rkxxgeorw6w4fpjp@localhost>
On 2021-Oct-07, rir wrote:
> For myself,
> 'FETCH [ <direction> [ FROM | IN ] ] <cursor_name>'
> clearly indicates that 'direction' is optional.
Hmm, aren't you misreading the scope of the outer square brackets? If
<direction> is optional independently of [FROM|IN], then the synopsis
should be
FETCH [ <direction> ] [ FROM | IN ] <cursor_name>
and I think that's correct, since all forms omitting any of these are
accepted:
alvherre=# begin;
BEGIN
alvherre=*# declare c scroll cursor with hold for select 1 ;
DECLARE CURSOR
alvherre=*# commit;
COMMIT
alvherre=# fetch forward from c;
?column?
----------
1
(1 fila)
alvherre=# fetch from c;
?column?
----------
(0 filas)
alvherre=# fetch BACKWARD c;
?column?
----------
1
(1 fila)
alvherre=# fetch c;
?column?
----------
(0 filas)
--
Álvaro Herrera 39°49'30"S 73°17'W — https://www.EnterpriseDB.com/
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To: pgsql-docs@postgresql.org
Cc: alvherre@alvh.no-ip.org, rirans@comcast.net, laurenz.albe@cybertec.at, pgsql-docs@lists.postgresql.org
Subject: Re: small patch
In-Reply-To: <202110072018.yugknob35ubc@alvherre.pgsql>
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