Steve Lime wrote:
This isn't an instance where a JOIN block is particularly useful. I need the
MySQL attributes for map making and JOINs are only used with query
results. Plus the MySQL join driver assumes integer keys and I have strings.
Hence my hope to do the join in OGR before the data even hit MapServer.


Here is a post by Frank from a couple of years ago that explains how to join shapefile and ODBC data with an OGR SQL statement in the layer's DATA parameter:

http://lists.osgeo.org/pipermail/mapserver-users/2004-November/002149.html

It should be easy to adapt this example to connect to MySQL instead of ODBC for the join, but I didn't test it myself. (The MySQL driver docs are at http://gdal.org/ogr/drv_mysql.html)

Daniel
--
Daniel Morissette
http://www.mapgears.com/
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