DBF to Shape OGR JOIN, PHP crashes
Frank Warmerdam
warmerdam at POBOX.COM
Thu Sep 15 06:52:28 PDT 2005
On 9/15/05, Christopher R. Thorne <christhorne at sympatico.ca> wrote:
>
> What do you mean an "OGR style index"? This maybe my problem. ;)
Chris,
The OGR Shapefile driver supports using indexes to accelerate
simple attribute lookups (for unique ids). To create the corresponding
index do something like:
ogrinfo abc.shp -sql "create index on abc using abc_id"
This is mentioned briefly near the bottom of the OGR SQL page at:
http://www.gdal.org/ogr/ogr_sql.html
Note that the indexes need to be dropped and rebuilt if you change
the file. They aren't maintained on the fly.
Best regards,
--
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I set the clouds in motion - turn up | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
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