[mapserver-users] Query Layer out of DB

[Alexander Pucher]

Steve,

sounds great to me, but:

a) can I do this with mapserver 3.4 ?

b) where to put/send the variable codelist ? Append it in the URL? Like 
e.g.: http://path/to/mapserver.phtml?codelist=AT|DE|IT ? Doesn't work 
like this!

The mapfile looks like this (it work, when I sustitute %codelist% with 
e.g. AT|DE|IT - they turn red):
...
...
...
LAYER
  NAME nut3
  DESCRIPTION "nut3"
  CLASSITEM "Nurgcd"
#  LABELITEM "Arrgcdl0"
  QUERYITEM "Nurgcd"
  TYPE POLYGON
  STATUS ON
 
 DATA nut3 
      CLASS
        EXPRESSION /%codelist%/
        NAME "0"
        COLOR 255 0 0
      END
      CLASS
        EXPRESSION /DE|IT|LI/
        NAME "1"
        COLOR 188 137 137
      END
      CLASS
        EXPRESSION /AT|FR|BE/
        NAME "2"
        COLOR 188 182 137
      END
      CLASS
        EXPRESSION /DK|NL/
        NAME "3"
        COLOR 141 188 137
      END
      CLASS
         EXPRESSION /CH|LU|SI/
        NAME "4"
        COLOR 137 175 188
      END
      CLASS
         EXPRESSION /EUCON|EULAK/
        NAME "4"
        COLOR 210 210 210
      END
 
      HEADER "Nurgcd NURGNM Link"
      TOLERANCE 1
      QUERYITEM "NURGNM"
       QUERY
       EXPRESSION /./
       TEMPLATE "ttt"
      END
     END

--------------------
mfg
ALEX



Stephen Lime wrote:

>Seems to me the easiest way to do this is to turn the results of the SQL query into a either an attribute query or a class expression that hilites the right polys. This assumes you have a primary key between the 2 systems, a county code or something. I'd recommend the class expression option since it's the most straight forward. 3.5 has a couple of nice features that make doing this sort of thing pretty easy. Basically you set up a map with 2 parts, layer descriptions that compose the background of the map and a single layer to use in displaying the right countries. That single layer is what you manipulate the class expression for. Set the status to OFF for that layer and set up a class like:
>
>CLASS
>  EXPRESSION /%codelist%/
>  ...
>END
>
>Then in your other app you'd create a variable that cats all the country codes together (i.e. id1|id2|id3) called codelist. MapServer CGI will substitute the value of codelist for %codelist% and there you have it, a dynamic expression. Be sure to turn the layer on.
>
>No need to go to MapScript on this one...
>
>Steve 
>
>Stephen Lime
>Data & Applications Manager
>
>Minnesota DNR
>500 Lafayette Road
>St. Paul, MN 55155
>651-297-2937
>
>>>>Alexander Pucher <pucher at atlas.gis.univie.ac.at> 09/26/01 07:11 AM >>>
>>>>
>Hello,
>
>I want to explain my question with a little example.
>
>Let's presume, I have a map of Europe with all the european countries 
>included. In addition to that, I have statistical data about the various 
>countries - like population, area etc. - stored in a database system - 
>say MySQL. I make a SQL query, showing me the 3 countries with the 
>highest poulation figures (e.g. Germany, France, UK). The system gives 
>me a button saying "Show in Mapserver". What I want to see is the map of 
>Europe with the three countries hilited.
>
>I'm quite sure that this has to be done with a newLayerObj, that is 
>simply put onto the "standard" layers. Can anybody give me some more 
>detailed information about this. Any suggestions, code snippets, links 
>or previously posted messages to mapserver-users-group would be great.
>
>mfg
>ALEX 
>


-- 
________________________________________________________

Institut fuer Geographie und Regionalforschung
Universität Wien
Kartografie und Geoinformation

Departement of Geography and Regional Research
University of Vienna
Cartographie and GIS

Universitaetstr. 7, A-1010 Wien, AUSTRIA

Tel: (+43 1) 4277 48644
Fax: (+43 1) 4277 48649
E-mail: pucher at atlas.gis.univie.ac.at

FTP: ftp://ftp.gis.univie.ac.at
WWW: http://www.gis.univie.ac.at/karto
________________________________________________________

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