Обсуждение: transaction bug with sequences ?

hi,

i've encountered some strange problem with ODBC  psqlodbc-07_01_0009
(system: pgsql 7.2 - cygwin)

this piece of SQL is giving me problems.


BEGIN TRANSACTION;
select nextval('some_id_seq');
ROLLBACK;
BEGIN TRANSACTION;
select nextval('some_id_seq');
ROLLBACK;
BEGIN TRANSACTION;
select nextval('some_id_seq');
ROLLBACK;
BEGIN TRANSACTION;
select nextval('some_id_seq');
ROLLBACK;

the expected result (and the result i'm getting from psql commandline
tool) is 4 times an __identical__ result value. Now, if i use ODBC and
execute these series of queries, i get 4 __different__ values. i think
something's wrong with odbc or borland bde (wich i'm using). Hope someone
could clear this one up.


thnx in advance

damn, the sequence in transactions is now also giving me problems in
pgsql. so this might be a pgsql bug (?) afterall ? or dit i miss something
here...

BEGIN TRANSACTION;
select nextval('some_id_seq');
ROLLBACK;

BEGIN TRANSACTION;
select nextval('some_id_seq');
ROLLBACK;

BEGIN TRANSACTION;
select nextval('some_id_seq');
ROLLBACK;

BEGIN TRANSACTION;
select nextval('some_id_seq');
ROLLBACK;


the sequence value is incremented, but this shouldn't be the case because
i cancelled the transaction.

xoror@infuse.org writes:
> the sequence value is incremented, but this shouldn't be the case because
> i cancelled the transaction.

This is not a bug.  Sequence updates don't roll back.

            regards, tom lane

On Thu, 14 Mar 2002, Tom Lane wrote:

> xoror@infuse.org writes:
> > the sequence value is incremented, but this shouldn't be the case because
> > i cancelled the transaction.
>
> This is not a bug.  Sequence updates don't roll back.
>
>             regards, tom lane
>
>

yes, i've finnally found some documentation on it.
thnx anyway :)