[mapserver-users] dynamic data in cgi-mapserver

[schroeter at netgis.de]

Hi,

I use following layer definition to show dynamic querys using a hidden 
form-field (name="testvar") in a cgi-mapserver-application:

 LAYER
  NAME "test"
  TYPE line
  STATUS on
  DATA routen/test.shp
     CLASSITEM "TESTID"
      CLASS
       Name "Select"
        EXPRESSION /%testvar%/
         OUTLINECOLOR 250 0 250
         SYMBOL 'circle'
     SIZE 8
     END  # CLASS
 END

The EXPRESSION /%testvar%/ enables me to send dynamic data via querystring 
or postvar. The variables are separated with a pipe, f.e 
"var1|var3|va6|var8".

3 Questions:
1.Where is this function documented?
2. Is it possible to use such variables for other objects in a mapfile in a 
cgi-apps? (I know, no problem with mapscript)
3. Is it possible to use dynamic sql-statements or data-source via post or 
get variable in a cgi-app (f.e. for CONNECTIONTYPE postgis)?

thanks
Sven