OGR connection vs shp DATA

[Eduin Carrillo]

> 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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