[mapserver-users] query expression

[Michael D. Hass]

Hi All-

I am riffing on the "simple item/itemn query" by having the user

enter in a value (instead of using the select box) and providing

a result using the mapserv cgi. This works for single items (find

the township), but I'd like to expand to find all polygons greater

than the input value. <<Was there a find all lakes greater than X

demo at one point?>


Can I do this using Expression in Class or should I be using Filter?


Relevant part of map file below.


Thanks for any comments.

Mike



This finds one township based on name, no problem.

<fontfamily><param>Courier New</param>LAYER

    NAME township

    DATA township

    STATUS DEFAULT

    TYPE POLYGON

    FILTERITEM "NAME"

    FILTER "%name%"

    CLASS

      #COLOR 255 255 212

      OUTLINECOLOR 0 0 0

      TEMPLATE case1_template.html

    END

  END


**this expression to get polys with acreage

greater than value entered by user??


LAYER

    NAME township

    DATA township

    STATUS DEFAULT

    TYPE POLYGON

    FILTERITEM "NAME"

    FILTER "%name%"

    CLASS

      #COLOR 255 255 212

      OUTLINECOLOR 0 0 0

      EXPRESSION ("name" gt "[ACRES]")

       

      TEMPLATE case1_template.html

    END

  END


</fontfamily>