[Qgis-developer] Re: qgsRelate (Table joins in QGIS)

Maurício de Paulo mauricio.dev at gmail.com
Sat Dec 26 23:56:40 EST 2009

Well, after some testing I found out that qgis now can open dbf files as
vector layers. It's enough for me to create the "relate" implementation.
As far as I can see, it's possible and won't take too long to implement.
Will it be usefull? Is anyone already working on a full join implementation?
Mauricio de Paulo

2009/12/26 Maurício de Paulo <mauricio.dev at gmail.com>

> Hi folks,
> I don't remember exactly what was defined on the last discussion about
> table joins.
> I've read many good sugestions, many of them about implementing attribute
> relationship inside qgsvectorprovider.
> I also work on ArcGIS and the relations and joins on ArcGIS usually don't
> show the full table join. It only shows the related attributes of a single
> feature. So for each feature, you can use a Info tool to see every attribute
> about it (including the ones that comes from related tables). Everything is
> done on the fly, but performance is not a big issue as i'm only going to
> search for one feature's relationships.
> I'm using the screenshots that are attached to the mail as an example of
> how it should work.
> At the moment I need some feedback on what it is or is not a good approach
> and if it's gonna be usefull for the users.
> What do you guys think?
> The idea is a plugin to record what relationships are stored for each layer
> and then show the attributes in a tree view where a single feature can be
> linked to many other rows in the second table. I still don't know how i'm
> going to implement it but either I will use ogr or qgsvectorprovider. I
> still have to search if it's possible to access the dbf files and postgis
> connections using qgis api.
> Any comment is welcome.
> Mauricio de Paulo
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