[postgis-users] QGIS freezes when saving table with AFTER INSERT or UPDATE

[Nicolas Ribot]

Hello,

A trigger is executed in a single transaction: "The execution of an
AFTER trigger
can be deferred to the end of the transaction, rather than the end of the
statement, if it was defined as a *constraint trigger*. In all cases, a
trigger is executed as part of the same transaction as the statement that
triggered it, so if either the statement or the trigger causes an error,
the effects of both will be rolled back." (
https://www.postgresql.org/docs/16/trigger-definition.html)

So QGIS has to wait for it to finish.
Nicolas

On Thu, 4 Jan 2024 at 11:16, Alexandre Neto via postgis-users <
postgis-users at lists.osgeo.org> wrote:

> Sorry for the cross posting.
>
> I have a table with the following trigger
>
> *CREATE* *TRIGGER* tr_base_cont_trocos_ai *AFTER*
> *INSERT* *OR* *UPDATE* *ON* base.cont_troco
> *FOR* *EACH* *STATEMENT*
> *EXECUTE* *FUNCTION* tr_gerar_outputs();
>
> Now, the tr_gerar_outputs() takes some time to process, as it generates
> new tables and updates a few materialized views.
>
> In QGIS, when I add or update one or more features and press save, I would
> expect it to be immediate, but it seems that QGIS hangs waiting for the
> function to finish before considering the save operation complete. If the
> function fails, it even prevent the feature to be commit.
>
> Is this expected for a AFTER INSERT OR UPDATE trigger? Shouldn't
> PostgreSQL commit the changes, inform QGIS that the operation was
> successful and only then execute the trigger?
>
> Thanks,
>
> Alexandre Neto
>
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