[Mapserver-users] 3.7 itemquery

[Oliver Wesp]

Thanks for you answer. I added this to the Migration Guide.
Oliver

At 12:40 26.02.2003 -0600, Steve Lime wrote:
>The old method was convoluted because parts of the process were in HTML
>forms and others in the map file. The changes have made it more self
>contained. Now you specify query parameters external to the mapfile,
>period. There are 2 new CGI variables: qitem and qstring (qlayer is also
>used but has been around forever). So, to set up an attribute query
>you:
>
>   - set qlayer to the appropriate layer name
>   - set qitem to the appropriate column name (not used for logical
>expressions)
>   - set qstring to a valid MapServer expression, string comparison,
>regular or logical
>
>How you build the qstring is up to you. From MapScript the process is
>the same. The method exists only at the layer level. It looks like:
>
>   queryByAttributes(mapObj *map, char *qitem, char *qstring, int
>mode);
>
>where mode = MS_MULTIPLE or MS_SINGLE. If a layer already has a FILTER
>defined those restrictions are not applied in addition to the qstring.
>Glad to answer any other questions.
>
>Steve
>
>Stephen Lime
>Data & Applications Manager
>
>Minnesota DNR
>500 Lafayette Road
>St. Paul, MN 55155
>651-297-2937
>
> >>> Oliver Wesp <wesp at gdv.com> 02/26/03 11:48AM >>>
>Hi,
>
>I'm struggling with 3.7 itemquery, itemnquery modes. The migration
>guide
>tells me that these have changed  'and should be much easier to
>use'.  That's good news but is there there any information available on
>how
>to get things working again? All I got so far is
>'msQueryByAttributes():
>Query error. No query expression defined.'
>
>Any hint is appreciated.
>
>Oliver
>
>--
>Dipl.-Geogr. Oliver Wesp
>Gesellschaft für geografische Datenverarbeitung
>Binger Strasse 49-51
>D-55218 Ingelheim
>fon: +49 6132 714818
>fax: +49 6132 714828
>http: <http://www.gdv.com>www.gdv.com
>
>
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-- 
Dipl.-Geogr. Oliver Wesp
Gesellschaft für geografische Datenverarbeitung
Binger Strasse 49-51
D-55218 Ingelheim
fon: +49 6132 714818
fax: +49 6132 714828
http: <http://www.gdv.com>www.gdv.com