From: Achilleus Mantzios <achill@matrix.gatewaynet.com>
To: Michael Fuhr <mike@fuhr.org>
Cc: Riccardo G. Facchini <abief_ag_-postgresql@yahoo.com>
Cc: pgsql-sql@postgresql.org
Cc: Theodore Petrosky <tedpet5@yahoo.com>
Cc: Andrei Bintintan <klodoma@ar-sd.net>
Cc: sad <sad@bankir.ru>
Subject: Re: A transaction in transaction? Possible?
Date: Wed, 10 Nov 2004 12:58:27 +0200 (EET)
Message-ID: <Pine.LNX.4.44.0411101256590.6883-100000@matrix.gatewaynet.com> (raw)
In-Reply-To: <20041110095352.GA55504@winnie.fuhr.org>
O Michael Fuhr Ýãñáøå óôéò Nov 10, 2004 :
> On Wed, Nov 10, 2004 at 12:45:19AM -0800, Riccardo G. Facchini wrote:
>
> > Sorry, but I understand that your example is not really about nested
> > transactions, but about sequential transactions.
>
> Here's a more elaborate example. If this doesn't demonstrate the
> capability you're looking for, then please provide an example of
> what you'd like to do and describe the desired behavior.
>
> CREATE TABLE person (id SERIAL PRIMARY KEY, name TEXT NOT NULL);
>
> BEGIN;
> INSERT INTO person (name) VALUES ('Alice');
>
> SAVEPOINT s1;
> INSERT INTO person (name) VALUES ('Bob');
>
> SAVEPOINT s2;
> INSERT INTO person (name) VALUES ('Charles');
>
> SAVEPOINT s3;
> INSERT INTO person (name) VALUES ('David');
> ROLLBACK TO s3;
>
> INSERT INTO person (name) VALUES ('Edward');
> ROLLBACK TO s2;
>
> INSERT INTO person (name) VALUES ('Frank');
> RELEASE s1;
>
> INSERT INTO person (name) VALUES ('George');
> COMMIT;
Just a very naive thought....
Wouldn't make more sense to allow nested begin/commit/rollback blocks?
>
> SELECT * FROM person;
> id | name
> ----+--------
> 1 | Alice
> 2 | Bob
> 6 | Frank
> 7 | George
>
> If you change "ROLLBACK TO s2" to "RELEASE s2" then you get this:
>
> id | name
> ----+---------
> 1 | Alice
> 2 | Bob
> 3 | Charles
> 5 | Edward
> 6 | Frank
> 7 | George
>
> If you change "RELEASE s1" to "ROLLBACK TO s1" then you get this:
>
> id | name
> ----+--------
> 1 | Alice
> 7 | George
>
>
--
-Achilleus
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To: pgsql-sql@postgresql.org
Cc: achill@matrix.gatewaynet.com, mike@fuhr.org, abief_ag_-postgresql@yahoo.com, tedpet5@yahoo.com, klodoma@ar-sd.net, sad@bankir.ru
Subject: Re: A transaction in transaction? Possible?
In-Reply-To: <Pine.LNX.4.44.0411101256590.6883-100000@matrix.gatewaynet.com>
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