Re: PL/PgSQL: EXIT USING ROLLBACK

On Mon, Sep 1, 2014 at 5:08 AM, Joel Jacobson <joel(at)trustly(dot)com> wrote:
> On Sat, Jul 26, 2014 at 8:39 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> Basically my point is that this just seems like inventing another way to
>> do what one can already do with RAISE, and it doesn't have much redeeming
>> social value to justify the cognitive load of inventing another construct.
>
> The main difference is with RAISE EXCEPTION 'OK'; you cannot know if
> it was *your* line of code which throw the 'OK'-exception or if it
> came from some other function which was called in the block of code.

The real problem here is that if you're using PL/pgsql exceptions for
control-flow reasons, you are taking a huge performance hit for that
notational convenience. I do agree that the syntax of PL/pgsql is
clunky and maybe we should fix that anyway, but I honestly can't
imagine too many people actually wanting to do this once they realize
what it does to the run time of their procedure (and in some cases,
the XID-consumption rate of their database).

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company