[OSGeo-Discuss] methods for programatically adding fields to shapefiles

[Tamas Szekeres]

I think it wouldn't be a big deal extending OGR SQL to accept constant
values in the select list.
In this case the parser would place the constant value into the
field_name memeber of swq_col_def, and field_index = -1 would denote
that it should be treated as a constant
in OGRGenSQLResultsLayer::TranslateFeature when copying the features over.

Best regards,

Tamas



2008/10/29 Tyler Erickson <tyler.erickson at mtu.edu>:
>
> I am interested in approaches for adding a populated field to a shapefile
> (for example, adding a new field named 'source_url' with the value
> 'http://somewebsite.com').  I would like to do this for several thousand
> files.
>
> At first I thought that I might be able to accomplish it using ogr2org with
> a sql clause, such as:
>
> ogr2ogr -sql "select *, 'http://somewebsite.com' as source_url from infile"
> outfile.shp infile.shp
>
> but that didn't work since ogr2ogr supports a limited set of SQL, described
> at:
> http://www.gdal.org/ogr/ogr_sql.html
>
> Any ideas on how to accomplish this? (I would prefer suggestions that can be
> scripted with python.)
>
> - Tyler
> --
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