[Mapserver-users] Simple query

[Eric Bridger]

1) You can display polygons in different colors by using CLASS
EXPRESSIONs in you map file. e.g.

LAYER
  NAME "polys"
  TYPE POLYGON
  DATA "data/polys"
  CLASS
    EXPRESSION ([AREA] > 2000)
    COLOR 255 0 0
  END
  CLASS
    EXPRESSION  ([AREA] <= 2000)
    COLOR 0 255 0
  END
END

2) You will need to use a DBF library/module to edit dbf files. I think
the mapscript lib only allows you to read dbf files.  In perl I use:
XBase.


On Sat, 2003-11-01 at 13:37, Nicolas Boretos wrote:
> Hi,
> 
> I have 2, seemingly simple questions.
> 
> Does someone have an example of querying a map and displaying the polygons that fullfill that criteria in a different color;
> 
> eg AREA > 2000
> Is this possible in the ms cgi, or do I need mapscript
> 
> Is it possible to (over)write a field in a record in the dbf with mapscript?
> 
> I am searching the list but figured I would ask anyway....
> 
> regards,
> 
> nicolas boretos
> P.S I am using ms3.4
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