[GRASS-dev] datetime function in v.in.ogr

Stefan Blumentrath Stefan.Blumentrath at nina.no
Thu Jun 27 14:24:32 PDT 2019

Hi Paulo,

Maybe SQLITE dialect [1] in ogr2ogr could help?!
Could be worth a try to create a vector VRT [2] with ogr2ogr and import that.
No idea if it is faster but could be an option...


1: https://gdal.org/programs/ogr2ogr.html#cmdoption-ogr2ogr-dialect
2: https://gdal.org/drivers/vector/vrt.html

From: grass-dev <grass-dev-bounces at lists.osgeo.org> On Behalf Of Paulo van Breugel
Sent: torsdag 27. juni 2019 23:15
To: Markus Metz <markus.metz.giswork at gmail.com>
Cc: GRASS developers email list <grass-dev at lists.osgeo.org>
Subject: Re: [GRASS-dev] datetime function in v.in.ogr

Op 27 juni 2019 23:05:17 schreef Markus Metz <markus.metz.giswork at gmail.com<mailto:markus.metz.giswork at gmail.com>>:

On Thu, Jun 27, 2019 at 9:27 PM Paulo van Breugel <p.vanbreugel at gmail.com<mailto:p.vanbreugel at gmail.com>> wrote:
> Hi devs,
> I am trying to import a shapefile using v.in.ogr, filtering on date
> using datetime, e.g.,
> v.in.ogr input=myshapefile.shp layer=myshapefile output=outputlayer
> where="datm_start >= datetime('2019-01-01')"
> I am getting the message:
> ERROR 1: Undefined function 'datetime' used.
> ERROR: Error setting attribute filter 'datm_start >= datetime('2019-01-01')'
> Does this mean it is not possible to use functions in v.in.ogr? Or am I
> doing somthing wrong?

The OGR shapefile driver does not support this function. You need to import the shapefile into GRASS, using anything but the dbf driver as database driver (default is sqlite), then try to filter with v.extract where="datm_start >= datetime('2019-01-01')"

Ok, thanks, was hoping I could do a selection before to safe on the time ik takes to import. I'll look for a way to filter before import using another tool.


Markus M

> Running grass gis 7.6, Linux.
> Cheers,
> Paulo
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