Обсуждение: Begin block

Hello,

I'm very much a Postgres PHP novice. I have a number of queries that
need to be run as a single transaction.  One set of those will only be
run some of the time, but other times will need to be imbedded in
another block.  Can I imbed a begin/commit inside another begin/commit?

Thanks,
Carol

On 01/07/2009 18:52, Carol Walter wrote:
> Hello,
>
> I'm very much a Postgres PHP novice. I have a number of queries that
> need to be run as a single transaction.  One set of those will only be
> run some of the time, but other times will need to be imbedded in
> another block.  Can I imbed a begin/commit inside another begin/commit?

Hi there,

I'm not sure about nested transactions, but you can achieve the same
effect with savepoints:

    http://www.postgresql.org/docs/8.4/static/sql-savepoint.html

HTH,

Ray.

------------------------------------------------------------------
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Galway Cathedral Recitals: http://www.galwaycathedral.org/recitals
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On 2009-07-01, Carol Walter <walterc@indiana.edu> wrote:
> Hello,
>
> I'm very much a Postgres PHP novice. I have a number of queries that
> need to be run as a single transaction.  One set of those will only be
> run some of the time, but other times will need to be imbedded in
> another block.  Can I imbed a begin/commit inside another begin/commit?

No, but perhaps you can fake it using savepoints.

> I'm very much a Postgres PHP novice. I have a number of
> queries that need to be run as a single transaction.  One set
> of those will only be run some of the time, but other times
> will need to be imbedded in another block.  Can I imbed a
> begin/commit inside another begin/commit?
>


Nested transactions are not allowed in Postgresql you must use
savepoints.

Nick