Обсуждение: What is the current status of FOR UPDATE cursors ?

What is the current status of FOR UPDATE cursors ?

older docs claim that the syntax is supported, but gives an error

http://www.postgresql.org/docs/8.2/static/sql-declare.html

docs for 9.1 do not have FOR UPDATE in main section

http://www.postgresql.org/docs/9.1/static/sql-declare.html

but then discuss using for update cursors further down.

-- 
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Hannu Krosing
PostgreSQL Unlimited Scalability and Performance Consultant
2ndQuadrant Nordic
PG Admin Book: http://www.2ndQuadrant.com/books/

Hannu Krosing <hannu@2ndQuadrant.com> writes:
> What is the current status of FOR UPDATE cursors ?

Same as it's been for a long time: FOR UPDATE [ OF table_name ]
works fine.

> older docs claim that the syntax is supported, but gives an error
> http://www.postgresql.org/docs/8.2/static/sql-declare.html

Old docs incorrectly said that it was FOR UPDATE [ OF column_name ]
but we have never implemented it that way.
        regards, tom lane

On Sun, 2012-05-06 at 13:17 -0400, Tom Lane wrote:
> Hannu Krosing <hannu@2ndQuadrant.com> writes:
> > What is the current status of FOR UPDATE cursors ?
> 
> Same as it's been for a long time: FOR UPDATE [ OF table_name ]
> works fine.

Ok, then it is just documentation fix

currently it is missing from \h declare and docs

hannu@hvost:~/work/pg92$ TESTINST/bin/psql -p 9200 -h /tmp
psql (9.2devel)
Type "help" for help.

hannu=# \h declare
Command:     DECLARE
Description: define a cursor
Syntax:
DECLARE name [ BINARY ] [ INSENSITIVE ] [ [ NO ] SCROLL ]   CURSOR [ { WITH | WITHOUT } HOLD ] FOR query

hannu=# 

> > older docs claim that the syntax is supported, but gives an error
> > http://www.postgresql.org/docs/8.2/static/sql-declare.html
> 
> Old docs incorrectly said that it was FOR UPDATE [ OF column_name ]
> but we have never implemented it that way.
> 
>             regards, tom lane
> 

On Sun, May  6, 2012 at 10:55:54PM +0200, Hannu Krosing wrote:
> On Sun, 2012-05-06 at 13:17 -0400, Tom Lane wrote:
> > Hannu Krosing <hannu@2ndQuadrant.com> writes:
> > > What is the current status of FOR UPDATE cursors ?
> > 
> > Same as it's been for a long time: FOR UPDATE [ OF table_name ]
> > works fine.
> 
> Ok, then it is just documentation fix
> 
> currently it is missing from \h declare and docs
> 
> hannu@hvost:~/work/pg92$ TESTINST/bin/psql -p 9200 -h /tmp
> psql (9.2devel)
> Type "help" for help.
> 
> hannu=# \h declare
> Command:     DECLARE
> Description: define a cursor
> Syntax:
> DECLARE name [ BINARY ] [ INSENSITIVE ] [ [ NO ] SCROLL ]
>     CURSOR [ { WITH | WITHOUT } HOLD ] FOR query
> 
> hannu=# 
> 
> > > older docs claim that the syntax is supported, but gives an error
> > > http://www.postgresql.org/docs/8.2/static/sql-declare.html
> > 
> > Old docs incorrectly said that it was FOR UPDATE [ OF column_name ]
> > but we have never implemented it that way.

What are you suggesting is missing from the docs?

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