[Qgis-user] Error saving/exporting data with many attributes

[b.j.kobben at utwente.nl]

To answer my own question: the problem is actually not the amount of attributes, but the fact that there are (2x) attributes columns with the same name (although they are different if you consider case sensitivity). Apparently GeoJSON is the only format that allows differentiating column names by upper/lowercase....

yours,

--
Barend Köbben


On 11/03/2019, 11:55, "Qgis-user on behalf of b.j.kobben at utwente.nl<mailto:b.j.kobben at utwente.nl>" <qgis-user-bounces at lists.osgeo.org<mailto:qgis-user-bounces at lists.osgeo.org> on behalf of b.j.kobben at utwente.nl<mailto:b.j.kobben at utwente.nl>> wrote:

Hi all,

I have a problem that (I think) comes down to a limit in the amount of attributes per object the QGIS exporting tools can handle.  Case in hand:

1) Import OSM data Points with many attributes (OSM tags), using QuickOSM – works

2) Temporary layer in QGIS is displayed -  seems fine

3) "Make Permanent" or "Export As..." fails on all file formats (except GeoJSON!). Error message is (for the GeoPackage case):

Export to vector file failed.
Error: Feature write errors:
Feature creation error (OGR error: sqlite3_exec(CREATE TABLE "test" ( "fid" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, "geom" POINT, "full_id" TEXT(255), "osm_id" TEXT(255), "osm_type" TEXT(255), "highway" TEXT(255),

... many more attributes...

"safe_place:school" TEXT(255), "safe_place:mosque" TEXT(255))) failed: duplicate column name: Operational_status)

Feature creation error (OGR error: failed to prepare SQL: INSERT INTO "test" ( "geom", "full_id", "osm_id", "osm_type", "highway", "name",

... again the same many more attributes...

"safe_place:school", "safe_place:mosque") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?))

This happens even when I have only 2 features (see attached test file). The workaraound is to use GeoJSON, bacuse for some reason that one works, but in normal case I have 1000s of points instead of two, and then a GeoJSON file becomes very large and unwieldy...

Any ideas if this is a bug or a limit in the actual formats such as GeoPackage...?
yours,

--
Barend Köbben
Senior Lecturer – ITC-University of Twente & ATLAS
PO Box 217, 7500 AE Enschede (Netherlands)
ITC Building (room 1-065)
@barendkobben
+31-(0)53 4874 253






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