One thing to note about item queries is that they do also use the map extent as
a
pre-filter. If you want to make sure all features are candidates then make sure
your
map extent encompasses all your features.
Now, for your error. The Kropla book predates many changes on the security side
of
MapServer and this is one example. In effect an attribute query mucks with the
FILTER of a layer and since that could be a where clause in a database you
don't
want to pass just anything. Assuming you have a cities layer it might look like
so:
LAYER
NAME 'cities'
DATA 'some shapefile'
TYPE POINT
METADATA
# allow query strings consisting of 2 or 3 character country codes
qstring_validation_pattern '^[A-Z]{2,3}$'
END
...
TEMPLATE 'some template' # to be queryable
END
and you'd query like so:
http://yourserver/cgi-bin/mapserv?map=yourmapfile.map&mode=itemquery&qstring=US&qitem=country&qlayer=cities
Make sense?
Steve
>>> MapServer Newbie <[email protected]> 08/21/09 7:47 AM >>>
Hello All!
I am a MapServer and Ubuntu newbie, trying to use the example code from:
Bill Kropla, Begining MapServer Open Source GIS Development
http://www.apress.com/book/downloadfile/2213
Chapter 5, fourth.map fourth.html...
the QUERY and NQUERY modes work (although the TOLERANCE is not changed from the
value in the .map file when he tries to use [map_Cities_tolerance] in the URL)
but I am unable to get the ITEMQUERY mode to work at all. I am using his
example of: qlayer=Cities qitem=COUNTRY qstring=/US/
I have also tried the non-regular expression query items: US 'US' "US"
I always get the following error message:
mapserv(): Web application error. Parameter 'qstring' value fails to validate.
msValidateParameter(): Regular expression error. Parameter pattern validation
failed.
the URL is:
http://localhost:8080/cgi-bin/mapserv?
zoomdir=0&zoomsize=2
&layer=Cities&layer=Countries
&mode=itemquery&qlayer=Cities&imgbox=&qitem=COUNTRY&imgshape=&qstring=%2FUS%2F
&mapshape=&map_Cities_tolerance=0&shapeindex=&map_Countries_tolerance=0
&imgxy=320+160&imgext=-180.000000+-89.859155+180.000000+89.859155
&map=%2Fhome%2Fgeorge%2Ffgs%2Fapps%2Fgmap-demo-cvs_MS_VERSION_54%2Fhtdocs%2Ffourth.map
&program=mapserv&slayer=Countries&previousmode=[previousmode]&savequery=true
I am running MapTools fgs-mapserver_extended_5.4.2-fgs_9.5-linux-i386.bin on
Ubuntu 9.04 Desktop
Anyone have any idea why ITEMQUERY doesn't work?
Anyone have an ITEMQUERY example that does work?
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