[Qgis-developer] PostGIS queries slow when in edit mode

[Manuel Hernández Martínez]

Hi, Andreas, thanks for your help.
We tried the built-in relation support, combined with the edit widgets and form view. Is that what you mean? Powerful features as they are, they don’t fit our needs, however. There are quite a few tables, with two-level relationships; the generated forms and the workflow using the built-in solution is still too complex for our digitizers daily work. We also had doubts regarding to how to handle referential integrity constraints in edit mode. That’s why we finally decided to build our own plugin.
In any case, I have taken a look at it again; it feels somewhat slower than our solution when not editing, and roughly the same in edit mode (no measures, though, just my first subjective impressions).

De: Neumann, Andreas [mailto:a.neumann at carto.net]
Enviado el: viernes, 08 de abril de 2016 16:02
Para: Manuel Hernández Martínez
CC: 'qgis-developer at lists.osgeo.org'
Asunto: Re: [Qgis-developer] PostGIS queries slow when in edit mode


Hi Manuel,

QGIS already has built-in relation support (1:n and n:m) - they should support server side queries. Do you really need to write your own plugin? Are the built-in relations not good enough?

Andreas

On 2016-04-08 15:26, Manuel Hernández Martínez wrote:
Hi!
I'm developing a plugin for QGIS. When the user selects a feature, it queries a few other layers from Postgis to fill in a form with related data.
The queries are slow, unless I check the option to run queries server-side. After that, the queries run instantaneously. Yay!
However, if the layers are put in edit mode, the queries are slow again! :(
After checking the Postgis logs it seems that the run queries server-side option has no effect when the layers are in edit mode.
Does anyone know whether it is a known, well-founded limitation or a bug?

Regards, Manuel

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