Re: not aborting transactions on failed select

On Tue, Sep 10, 2013 at 7:02 PM, Sergey Shelukhin
<sergey(at)hortonworks(dot)com> wrote:
> Hi.
> Is there any way to make postgres not abort the transaction on failed
> select?
>
> I have a system that uses ORM to retrieve data; ORM is very slow for some
> cases, so there's a perf optimization that issues ANSI SQL queries directly
> thru ORM's built-in passthru, and falls back to ORM if they fail.
> All of these queries are select-s, and the retrieval can be a part of an
> external transaction.
>
> It worked great in MySQL, but Postgres being differently ANSI-non-compliant,
> the queries do fail. Regardless of whether they can be fixed, in such cases
> the fall-back should work. What happens in Postgres however is that the
> transaction is aborted; all further SELECTs are ignored.

I would like to see the query and in what way PostgreSQL is failing.
Generally a query that works on mysql and fails on postgresql is
itself usually non-ansi compliant.

As others pointed out, you can use savepoints if you need to rollback
part of a transaction to a previously good point and start back from
there.