Re: savepoint improvements

On Mon, 2007-01-22 at 10:46 -0500, Tom Lane wrote:
> "Merlin Moncure" <mmoncure(at)gmail(dot)com> writes:
> > On 1/22/07, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
> >> Could you post an example, just so we're all clear what the problems
> >> are? I thought I understood what you are requesting; I may not.
>
> > ok,
>
> > The short version is I would like the ability to run some sql commands
> > and recover the transaction if an error occurs.
>
> I'm getting tired of repeating this, but: neither of you have said
> anything that doesn't appear to me to be handled by ON_ERROR_ROLLBACK.
> What exactly is lacking in that feature?

Sorry for not replying to your other post.

ON_ERROR_ROLLBACK doesn't do the same thing, thats why. It shuts out the
noise messages, true, but it doesn't re-execute all of the commands in
the transaction that succeeded and so breaks the transaction, as
originally coded.

BEGIN;
stmt1;
stmt2; <-- error
stmt3;
COMMIT;

results in stmt3 completing successfully even though stmt1 and stmt2 do
not == broken script.

The behaviour we've been discussing is when stmt2 fails, to allow stmt3
to be submitted, so that at commit, stmt1 and stmt3 effects will be
successful *if* the user wishes this.

--
Simon Riggs
EnterpriseDB http://www.enterprisedb.com