Class expression and PostGIS
Aaron Koning
aaronkoning at GMAIL.COM
Fri Jun 23 23:26:21 PDT 2006
This post may be helpful:
http://mapserver.gis.umn.edu/data2/wilma/mapserver-users/0405/msg00714.html
Aaron
On 6/23/06, Nigel Gilbert <n.gilbert at surrey.ac.uk> wrote:
>
> [Many thanks to those who helped me yesterday overcome a problem with
> creating an oid index, now solved as a result of their advice]
>
> I have a PostGIS database including a table, world, with columns,
> object_type (containing either one of the strings, 'plants' or 'agents')
> and
> 'geom', containing points. In my map file I have:
>
> LAYER
> NAME World
> CONNECTIONTYPE postgis
> CONNECTION "user=..... dbname=...."
> DATA "geom from world"
> STATUS ON
> TYPE POINT
>
> CLASS
> NAME Agents
> EXPRESSION ([object_type] = 'agents')
> STYLE
> COLOR 255 111 207 # pink
> END
> END
>
> CLASS
> NAME Plants
> EXPRESSION ([object_type] = 'plants')
> STYLE
> COLOR 0 128 64 # green
> END
> END
> END
>
> This gives a map displaying nothing, although if I comment out the
> expressions, I get the points I would then expect. In other words, the
> expressions are always returning false. But getting the data directly:
>
> select object_type, AsText(geom) from world limit 3;
> object_type
> | astext
>
> ----------------------------------------------------------------------------
> --------------------------+----------------
> plants
> | POINT(13 19)
> plants
> | POINT(228 840)
> plants
> | POINT(694 674)
> (3 rows)
>
> is fine. What's wrong??
>
> Thanks again!
>
> Nigel
>
--
+--------------------------------------------
| Aaron Koning
| Information Technologist
| Prince George, BC, Canada.
+--------------------------------------------
| http://datashare.gis.unbc.ca/fist/
| http://datashare.gis.unbc.ca/gctp-js/
+--------------------------------------------
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