Re: Procedures

On Mon, Aug 24, 2020 at 05:24:19PM +0200, Pavel Stehule wrote:
>
>
> po 24. 8. 2020 v 17:01 odesílatel Bruce Momjian <bruce(at)momjian(dot)us> napsal:
>
> On Sat, Aug 22, 2020 at 01:21:43PM -0700, David G. Johnston wrote:
> > On Sat, Aug 22, 2020 at 10:14 AM Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> >
> >     On Fri, Aug 21, 2020 at 07:42:35PM -0700, David G. Johnston wrote:
> >
> >     > [...] the CALL command.  If the CALL command is not part of an
> explicit
> >     > transaction a procedure can also manage multiple transactions
> during its
> >     > execution.
> >
> >     OK, how is this updated patch?
> >
> >
> > Looks good.  I felt "begin and commit" was a bit wordy but it works.
>
> So, I was worried that "manage multiple transactions" could imply
> something like savepoints, which can be managed by functions.  It is
> really the top-level begin/commit that is unique for procedures.
>
> Functions is executed under outer transaction every time - rollback to save
> point hasn't impact on outer transaction. Inside procedures (in special case)
> can be transactions ended (by statements COMMIT or ROLLBACK). Immediately is
> started new transaction.

Well, savepoints control what commands are considered _part_ of the
outer transaction, so in a way you are managing what is in the outer
transaction. This is why begin/commit was clearer for me. Maybe "start
and commit" is clearer?

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EnterpriseDB https://enterprisedb.com

The usefulness of a cup is in its emptiness, Bruce Lee