Hi Even thanks! INDIRECT_SQLITE works like a charm. I could not figure out the syntax to create a new layer in the very same gpkg file:
stefan@hatschepsut:~/Downloads$ ogr2ogr -append -f GPKG 2601.gpkg -nln my_new_layer -dialect INDIRECT_SQLITE -sql 'SELECT * FROM bodenbedeckung__bbtext WHERE tid IN (SELECT tid FROM bodenbedeckung__bbtext GROUP BY ST_X(ST_SnapToGrid(geom, 500)), ST_Y(ST_SnapToGrid(geom, 500)), nummer_name ORDER BY ST_X(ST_SnapToGrid(geom,500)), ST_Y(ST_SnapToGrid(geom, 500)), ST_Distance(geom, ST_SnapToGrid(geom, 500)))' 2601.gpkg ERROR 1: sqlite3_exec(CREATE TABLE "my_new_layer" ( "fid" INTEGER PRIMARY KEY AUTOINCREMENT, "geom" POINT )) failed: database is locked ERROR 1: Terminating translation prematurely after failed translation from sql statement. Is this even possible? regards Stefan On Mon, Oct 6, 2014 at 8:20 PM, Even Rouault <[email protected]> wrote: > Le lundi 06 octobre 2014 19:41:43, Stefan Ziegler a écrit : > > Hi > > > > When trying to use SQLite dialect with GeoPackage I get some errors, > like: > > > > stefan@hatschepsut:~/Downloads$ ogrinfo -al -sql 'SELECT > > ST_X(ST_SnapToGrid(geom,1)) FROM bodenbedeckung__bbtext LIMIT 1' > > 2601.gpkgINFO: Open of `2601.gpkg' > > using driver `GPKG' successful. > > ERROR 1: In ExecuteSQL(): sqlite3_prepare(SELECT > > ST_X(ST_SnapToGrid(geom,1)) FROM bodenbedeckung__bbtext LIMIT 1): > > no such function: ST_SnapToGrid > > > > > > The same query works with Shapefiles. I thought the SQLite dialect can be > > used with any OGR datasource? > > Stefan, > > You need a very recent Spatialite (4.2 I think) for compatibility with > GeoPackage. But your request would not work since Spatialite functions can > only work with Spatialite geometry blobs and not Geopackage geometry blobs. > Spatialite 4.2 provide explicit conversion methods AsGPB / GeomFromGPB. > > For example : > > $ ogrinfo poly.gpkg -sql "select AsGPB(ST_SnapToGrid(GeomFromGPB(geom),1)) > from poly" > > I've also just added in trunk a "INDIRECT_SQLITE" dialect that will cause > the > generic solution used for shapefiles for example to be usable by GeoPackage > datasources too. But this will be slower than direct SQL due to an extra > translation layer done by OGR ( GPKG -> OGR feature -> SQLite/Spatialite > virtual table -> OGR feature ). > > $ ogrinfo poly.gpkg -sql "select ST_SnapToGrid(geom,1) from poly" -dialect > INDIRECT_SQLITE > > Even > > -- > Spatialys - Geospatial professional services > http://www.spatialys.com >
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