[Qgis-developer] Geospackage Slow in QGIS

[Siki Zoltan]

Dear Andrea,

what about using DB Manager's SQL window?
There you can input an SQL select.

To remove a column in SQLite you can create a new table without the column 
to delete and then use
INSERT INTO new_table SELECT ...

Regards,
Zoltan

On Mon, 18 Aug 2014, Andrea Peri wrote:

> Just to explain why this is an important question.

On a sqlite db is impossible to remove a field.
So if a table is with two geometry field, it is never see-able from qgis.
Because is not possible a command like:

alter table remove filed geometry-2;

Bye,

Andrea Peri.


2014-08-18 16:52 GMT+02:00 Andrea Peri <aperi2007 at gmail.com>:
> Hi,
>
> I have changed my opinin.
> From +1 to +0
>
> Infact I discovered just now that gdal driver for spatialite don't
> seem to support tables with more than 1 geometrt field.
> Almost on QGIS.
>
> Andrea
>
>
> 2014-05-17 22:19 GMT+02:00 Jeremy Palmer <JPalmer at linz.govt.nz>:
>> I'm wondered why QGIS needs a native SpatiaLite provider and connection dialogue any more. Unlike other database providers such as PostGIS, Oracle, MSSQL the SpatiaLite provider doesn't seem to have anything special that requires a QGIS provider. From a users perspective it just adds to the confusion and complexity for adding data. Why not just use GDAL/OGR for both Geopackage and Spatialite?
>>
>> Cheers
>> Jeremy
>> ________________________________________
>> From: Stefan Keller [sfkeller at gmail.com]
>> Sent: Sunday, 18 May 2014 12:24 a.m.
>> To: Martin Dobias
>> Cc: Jeremy Palmer; qgis-developer at lists.osgeo.org
>> Subject: Re: [Qgis-developer] Geospackage Slow in QGIS
>>
>> Hi Martin
>>
>> It has a different binary encoding compared to Spatialite.
>> And in addition it integrates raster tiles (MBTiles) and metadata.
>>
>> -S.
>>
>>
>> 2014-05-17 14:10 GMT+02:00 Martin Dobias <wonder.sk at gmail.com<mailto:wonder.sk at gmail.com>>:
>> Hi
>>
>> On Sat, May 17, 2014 at 2:32 PM, Jeremy Palmer <JPalmer at linz.govt.nz<mailto:JPalmer at linz.govt.nz>> wrote:
>>> I've just been using the new implementation of Geopackage in QGIS :) However each map render or feature info is very slow for large database files - even with the new GDAL/OGR Geopackage spatial index support. Each time QGIS renders a new map view or executes a feature info it re-opens the Geopackage file in QgsOgrFeatureIterator via OGROpen, and the Geopackage driver open method runs PRAGMA integrity_check which is very slow (4 secs with my 2GB test file). This integrity check is actually a Geopackage requirement.
>>>
>>> How can this be fixed? At the in QGIS or GDAL/OGR level?
>>
>> Actually I am wondering how different is the format of GeoPackage from
>> the format of SpatiaLite... we could use our native SpatiaLite
>> provider also for GeoPackage files if they are close enough. Any
>> ideas?
>>
>> Regards
>> Martin
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>
>
> --
> -----------------
> Andrea Peri
> . . . . . . . . .
> qwerty ˙˙˙˙˙˙˙˙˙˙
> -----------------



-- 
-----------------
Andrea Peri
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