OGR connection vs shp DATA
Eduin Carrillo
yecarrillo at YAHOO.COM
Thu Nov 18 07:36:09 PST 2004
> Eduin,
>
> Advantages of using OGR for shapefile access:
>
> o OGR is slower than built-in Shapefile support because of many extra
> layers of abstraction and conversion.
> o OGR is slower because it doesn't currently support use of spatial
> indexes for shapefiles while the built-in mapserver shapefile support
> does. (Note: I actually have support for mapserver style spatial indexes
> half implemented in my local development tree, but no ETA).
> o OGR supports "OGR SQL" in the DATA statement, though most effects you
> might accomplish that way can be simulated at least as efficiently using
> MapServer expressions and other mechanisms.
> o You can use OGR style joins, including the ability to join to some
> non-shapefile types of stuff as long as it is supported by OGR. I am
> not sure how OGR joining compares to the built-in mapserver joins that
> work for shapefiles.
>
> Basically, except for rare circumstances you are better off using the
> built-in shapefile support instead of accessing through OGR.
>
> Best regards,
>
Thank You. It is the most clear answer. I'm thinking to support joined shapes
tables and OGR connection format for the next release of Gix Export Tool.
Eduin
=====
Eduin Yesid Carrillo Vega
yecarrillo at yahoo.com
COLOMBIA
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