[QGIS-Developer] Strange Mysql (spatial) behaviour: no points visible

[Richard Duivenvoorde]

No hints :-) ?

I now have a live connection to the db, and can reproduce the issue here in master on Linux too.

It's really strange: have a local db, I can even copy features from the attribute table to my local table, and THEN they show up

ogrinfo shows exactly the same information of the db ( using -so).

coordinates are fine too:

select coord, ST_AsWKT(coord) from tblQgisProjecten tqp limit 1

coord                                    |ST_AsWKT(coord)                         |
-----------------------------------------+----------------------------------------+
POINT (168937.186906043 175180.302889316)|POINT(168937.186906043 175180.302889316)|

could it be in char encoding, or in a strange attribute value? We already tried to create a simple view with only coord and ID, but that did not show something either.

As I cannot share the connection info, I'm happy to share my screen or so to show this.

SELECT version();
version()|
---------+
8.0.34-26|

but is an upgraded db, not sure where it came from

Regards,

Richard Duivenvoorde


On 1/12/24 15:06, Richard Duivenvoorde via QGIS-Developer wrote:
> Hi Devs,
> 
> I was contacted by a company who after upgrading their db and QGIS did NOT see the points anymore.
> 
> Note that 'all worked' when they used QGIS 3.10 (and an older mysql db)
> After a MySQL database upgrade, QGIS 3.10 was not able to connect anymore (apparently TLS issues), so they have to use 3.28 or higher.
> 
> A small export loaded in my local db was OK in QGIS.
> 
> So in a online meeting, sharing their screen I tried:
> 
> - opening the db with ogrinfo: all data is visible (POINT(.....)) showing correct coords and attributes
> - loading the table (25000 records) in QGIS: data: EPSG:31370 project EPSG:31370 :
>      - attribute table shows all records
>      - mapcanvas empty!
>      - able to 'zoom to' records (Belgium), but NO points visible/selectable
> - creating a tiny table with only id and geom column of 3 records: mapcanvas emtpy
> - export the loaded (but invisible) layer to a geopackage: points AND attributes VISIBLE!
> - loading the data in dbeaver: all data is shown in the spatial tab
> 
> There was an encoding issue when exporting to gpkg, but we tried to create a smaller table (very few columns): nothing.
> 
> Anybody familiar with QGIS and Mysql has an idea what this not showing of any point/geom could be?
> 
> Any hint appreciated, I plan to try to get a connection to the db myself, but hoping I just miss something obvious...
> 
> Regards,
> 
> Richard Duivenvoorde
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