From: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
---|---|
To: | rir <rirans(at)comcast(dot)net> |
Cc: | Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, pgsql-docs(at)lists(dot)postgresql(dot)org |
Subject: | Re: small patch |
Date: | 2021-10-07 20:18:49 |
Message-ID: | 202110072018.yugknob35ubc@alvherre.pgsql |
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Lists: | pgsql-docs |
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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