[mapserver-users] Layer Object Parameter Substitution from URLusing GIS

[Steve Lime]

You'll need to use 5.4 to get this functionality. That version add
support to allow you to define
validation strings to lock down what values can be passed for the
variable. Another solution is
to consider using runtime substitution to do something similar. That
works well if the SQL is
pretty much fixed:

 FILTER 'wert=%myval%'

It's also easier to secure.

Steve

>>> On 4/6/2009 at 4:01 AM, in message
<200904061101.54781.schroete at iup.physik.uni-bremen.de>, Heiko Schröter
<schroete at iup.physik.uni-bremen.de> wrote:
> Hello,
> 
> when passing a 'FILTER' parameter to be changed with the URL to use
GIS 
> requests, mapserv(5.0.3) fails with:
> loadLayer(): Unknown identifier. Parsing error near (FILTER):(line
1)
> 
> The call is:
> 
> http://localhost/cgi-bin/mapserv?MAP=/MapServer/country98/heiko1.map&

> LAYERS=karte,grid,psc&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&
> STYLES=&EXCEPTIONS=application/vnd.ogc.se_inimage&
> FORMAT=image/png&
> SRS=epsg:4326&BBOX=-180,7.91,-82.08,105.83&
> WIDTH=256&HEIGHT=256&
> MAP.LAYER[psc].FILTER='wert=0'
> (Linebreaks included for readability)
> 
> When omitting this part: " MAP.LAYER[psc].FILTER='wert=0'  "  the map
is 
> generated fine (without the proper GIS data of course).
> 
> I did read several comments in the archive and the net about this
issue but 
> haven't found a solution to this problem.
> What do i miss here ?
> 
> Thanks and Regards
> Heiko
> 
> 
> The Mapfile:
> MAP
> 	NAME WELT
>         DEBUG ON
> 	STATUS ON
> 	#SIZE 647 320
>         SIZE 800 400
> 	IMAGETYPE PNG24
> 	IMAGECOLOR 240 240 240
> 	SHAPEPATH "data"
>         EXTENT -180 -90 180 90
> 	UNITS DD
> 	WEB
> 		IMAGEPATH "images"
> 		IMAGEURL "images"
> 		MINSCALE 50000
> 		MAXSCALE 400000000
> 		METADATA
> 			"wms_title" "Example WMS Server"
> 			"wms_onlineresource" 
"http://localhost/cgi-bin/mapserv?map=heiko.map&"
> 			"wms_srs" "epsg:4326 epsg:32661 epsg:32761"
> 		END
> 	END
> 	SYMBOL
> 		NAME 'circle'
> 		TYPE ELLIPSE
> 		POINTS 1 1 END
> 		FILLED TRUE
> 	END
> 	SYMBOL
> 		NAME 'star'
> 		TYPE VECTOR
> 		FILLED TRUE
> 		POINTS
> 		      0 .375
> 		      .35 .375
> 		      .5 0
> 		      .65 .375
> 		      1 .375
> 		      .75 .625
> 		      .875 1
> 		      .5 .75
> 		      .125 1
> 		      .25 .625
> 		END
> 	END
> 	PROJECTION
> 		"init=epsg:4326"
> 	END
> 	LAYER
> 		NAME "karte"
> 		TYPE POLYGON
> 		STATUS ON
>                 OPACITY 50
> 		DATA "cntry98"
>                 METADATA
>                   "wms_title" "karte layer"
>                   "DESCRIPTION" "Grid"
>                 END
> 		PROJECTION
> 		    "init=epsg:4326"
> 		END
> 		CLASS
> 			NAME "karte_color"
> 			OUTLINECOLOR 60 60 60
> 			COLOR 100 100 100
> 			SYMBOL 0
> 		END
> 	END
> 	LAYER
> 	   NAME "grid"
> 	   OPACITY 60
> 	   METADATA
> 		"wms_title" "grid layer"
> 		"DESCRIPTION" "Grid"
> 	   END
> 	   TYPE LINE
> 	   STATUS ON
> 	   PROJECTION
> 		"init=epsg:4326"
> 	   END
> 	   CLASS
> 		NAME "Graticule"
> 		COLOR 0 0 0
> # Labels comented out for readabilty in the moment
> #		LABEL
> #			COLOR 0 0 0
> #			#FONT "fritqat"
> #			#TYPE truetype
> #                        MINDISTANCE 1000
> #			SIZE SMALL
> #			POSITION LR
> #			PARTIALS FALSE
> #			BUFFER 5
> #			OUTLINECOLOR 200 200 200
> #		END
> 	   END
> 	   GRID
> 		LABELFORMAT "DD"
> 		# LABELFORMAT '%g°' # dec degrees with symbol
>                 # MINARCS 1
> 		MAXARCS 1
>                 MININTERVAL 30
> 		MAXINTERVAL 60
> 		# MINSUBDIVIDE 100
> 		MAXSUBDIVIDE 300
> 		# LABELFORMAT ’%7.0f m’ # nice if a projected SRS
used
> 		# MININTERVAL 20000
> 		# MAXSUBDIVIDE 2
> 	   END
>  	END # Layer
> 
> 	LAYER
> 		NAME "psc"
> 		CONNECTIONTYPE POSTGIS
> 		OPACITY 80
> 		STATUS ON
> 		METADATA
> 			"wms_title" "psc layer"
> 		END
> 		PROJECTION
> 			"init=epsg:4326"    
> 		END
> 		CONNECTION "user=fum password=xyz dbname=foo
host=localhost"
> 		DATA "geocenter from scia_psc"
> 		FILTER "wert=1"
> 		TYPE POINT
> 		CLASS
> 			COLOR 250 10 10
> 			SYMBOL "circle"
> 			SIZE 7
> 		END
>         END
> 	LAYER
> 		CONNECTIONTYPE POSTGIS
> 		NAME "nlc"
> 		OPACITY 80
> 		STATUS ON
> 		METADATA
> 			"wms_title" "nlc layer"
> 		END
> 		PROJECTION
> 			"init=epsg:4326"
> 		END
> 		CONNECTION "user=fum password=xyz dbname=foo
host=localhost"
> 		DATA "geocenter from scia_nlc"
> 		FILTER "wert=1"
> 		TYPE POINT
> 		CLASS
> 			COLOR 10 250 10
> 			SYMBOL "star"
> 			SIZE 7
> 		END
> 	END
> 	LAYER
> 		CONNECTIONTYPE POSTGIS
> 		NAME "stro3"
> 		OPACITY 80
> 		STATUS ON
> 		METADATA
> 			"wms_title" "stro3 layer"
> 		END
> 		PROJECTION
> 			"init=epsg:4326"
> 		END
> 		CONNECTION "user=fum password=xyz dbname=foo
host=localhost"
> 		DATA "geocenter from scia_stro3"
> 		FILTER "wert=1"
> 		TYPE POINT
> 		CLASS
> 			COLOR 10 10 250
> 			SYMBOL "circle"
> 			SIZE 7
> 		END
> 	END
> END # Ende Map
> 
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