Thread: distinguish update from insert (on conflict)
Is it still impossible to distinguish whether a row was inserted vs updated ? The latest I can see is here: https://wiki.postgresql.org/wiki/UPSERT#RETURNING_behavior ..but I'm hopeful that the 4 year old wiki page is out of date. Justin
On 5/21/19 6:34 PM, Justin Pryzby wrote: > Is it still impossible to distinguish whether a row was inserted vs updated ? You will need to be more specific. On a hunch, see transition relation info here: https://www.postgresql.org/docs/10/sql-createtrigger.html > > The latest I can see is here: > https://wiki.postgresql.org/wiki/UPSERT#RETURNING_behavior > > ..but I'm hopeful that the 4 year old wiki page is out of date. > > Justin > > > -- Adrian Klaver adrian.klaver@aklaver.com
On Tue, May 21, 2019 at 06:57:36PM -0700, Adrian Klaver wrote: > On 5/21/19 6:34 PM, Justin Pryzby wrote: > >Is it still impossible to distinguish whether a row was inserted vs updated ? > > You will need to be more specific. Sorry, I mean with UPSERT / "INSERT .. ON CONFLICT DO UPDATE", is it possible to tell whether a row was inserted vs. updated ? Thanks, Justin
On 22/05/2019 03:37, Justin Pryzby wrote:
> On Tue, May 21, 2019 at 06:57:36PM -0700, Adrian Klaver wrote:
>> On 5/21/19 6:34 PM, Justin Pryzby wrote:
>>> Is it still impossible to distinguish whether a row was inserted vs updated ?
>>
>> You will need to be more specific.
>
> Sorry, I mean with UPSERT / "INSERT .. ON CONFLICT DO UPDATE", is it possible
> to tell whether a row was inserted vs. updated ?
>
> Thanks,
> Justin
>
>
Here's my recipe for that:
RETURNING
/* whatever, */
(xmax = 0) AS is_new_record
;
I don't know if any of the hackers thought of a sleeker technique
--
Regards
Fabio Ugo Venchiarutti
OSPCFC Network Engineering Dpt.
Ocado Technology
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On 5/21/19 7:37 PM, Justin Pryzby wrote: > On Tue, May 21, 2019 at 06:57:36PM -0700, Adrian Klaver wrote: >> On 5/21/19 6:34 PM, Justin Pryzby wrote: >>> Is it still impossible to distinguish whether a row was inserted vs updated ? >> >> You will need to be more specific. > > Sorry, I mean with UPSERT / "INSERT .. ON CONFLICT DO UPDATE", is it possible > to tell whether a row was inserted vs. updated ? In addition to Fabio's suggestion, from my previous post: https://www.postgresql.org/docs/10/sql-createtrigger.html "n some cases it is possible for a single SQL command to fire more than one kind of trigger. For instance an INSERT with an ON CONFLICT DO UPDATE clause may cause both insert and update operations, so it will fire both kinds of triggers as needed. The transition relations supplied to triggers are specific to their event type; thus an INSERT trigger will see only the inserted rows, while an UPDATE trigger will see only the updated rows." So you might want to check out triggers using transition tables. > > Thanks, > Justin > -- Adrian Klaver adrian.klaver@aklaver.com
Justin Pryzby wrote: > Is it still impossible to distinguish whether a row was inserted vs updated ? > > The latest I can see is here: > https://wiki.postgresql.org/wiki/UPSERT#RETURNING_behavior > > ..but I'm hopeful that the 4 year old wiki page is out of date. Maybe this answer can help you: https://stackoverflow.com/a/39204667/6464308 Yours, Laurenz Albe -- Cybertec | https://www.cybertec-postgresql.com