[Gdal-dev] Another Question about OGRDataSource::ExecuteSQL

jody at ifi.unizh.ch jody at ifi.unizh.ch
Wed May 5 12:37:26 EDT 2004


Hi

I assume that the SQL statement passed to ExecuteSQL
refers to the attributes of the features in the Datasource.

If the DataSource contains only one layer,
everything seems to  be well-defined, because
all features within a layer must have the same sorts of attributes.

But what happens if the datasource contains more than one layer
(which it can, corresponding to the explanation in ogr_arch.html)
which have different attribute schemas?

Or does an additional restriction apply to features in a
"multilayered" Datasource?

Thanks
  Jody



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