Re: BUG #5244: Attempting to rollback to a savepoint after receiving an error with state 55000 the process hangs

On Mon, Dec 14, 2009 at 11:15 PM, Philip Graham <philip(at)lightbox(dot)org> wrote:
>
> The following bug has been logged online:
>
> Bug reference:      5244
> Logged by:          Philip Graham
> Email address:      philip(at)lightbox(dot)org
> PostgreSQL version: 8.3.8
> Operating system:   Linux
> Description:        Attempting to rollback to a savepoint after receiving an
> error with state 55000 the process hangs
> Details:
>
> This may be a PHP so please excure me if it is.
>
> <?php
> $pdo = new PDO('pgsql:host=localhost;dbname=a_db', 'a_user', 'my_pass');
> $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
>
> echo 'Creating test objects'."\n";
> $pdo->query('CREATE SEQUENCE test_seq');
>
> echo 'Setup complete'."\n";
> $pdo->beginTransaction();
>
> try {
>    echo 'Setting savepoint'."\n";
>    $pdo->query('SAVEPOINT pre_id_fetch');
>    echo 'Fetching value'."\n";
>    $stmt = $pdo->query('SELECT currval(\'test_seq\');');
>    $curId = $stmt->fetchColumn();
>    echo 'Releasing savepoint'."\n";
>    $pdo->query('RELEASE SAVEPOINT pre_id_fetch');
> } catch (PDOException $e) {
>    echo 'Rolling back'."\n";
>    $pdo->query('ROLLBACK TO pre_id_fetch');
>    $curId = 0;
> }
>
> echo 'Cur Id: ',$curId,"\n";
>
>
> Running this code it hangs after echoing 'Rolling back', but only hangs
> every other execution (assuming the sequence was deleted first).

I can't reproduce this using psql. Could you try? I am guessing that
PHP is doing something funky, but I'm not really sure what. I do
notice that you don't seem to have an endTransaction() or similar to
match the beginTransaction() - could that be relevant?

...Robert