Opened 20 years ago
Last modified 15 years ago
#674 new enhancement
possible to classify map layer on JOIN attributes? — at Initial Version
Reported by: | Owned by: | sdlime | |
---|---|---|---|
Priority: | normal | Milestone: | 6.0 release |
Component: | MapServer C Library | Version: | unspecified |
Severity: | minor | Keywords: | |
Cc: | mapserver@…, pierrick.brihaye@… |
Description
(in this description is my enhancement request and some remarks from Attila Csipa from email converstation about this subject) In my map file I have several shapefile map layers with joins to dbf files. What I'm trying to do is classify and display such a map layer based on attributes from the joined dbf. But when I try I get an error message: msDrawMap(): Image handling error. Failed to draw layer named 'aanleiding'... <brmsDBFGetItemIndex(): DBASE file error. Item 'AANLEIDING' not found. <br> The item 'AANLEIDING' is a field in the external dbf. >>Attila Csipa > I see nothing wrong with your example, but I have not used DBF joins > extensively so don't take my word for granted. Also, check which version of > Mapserver are you using, IIRC it has been worked on joins in the latest > releases and some xbase (dbf) functionality was lost and then later > reintroduced around 4.0. Querying the map does show the joined attributes so I suppose on a map layer with a join you can query the joined attributes but you cannot use them to classify and display the layer. Is this correct? If not, what am I missing and if so, wouldn't this be a nice enhancement? >>Attila Csipa > That is correct. I have personally suggested that enhancement as well but at > is turns out it is not easy to implement so it will have to wait until > somebody invests the time and effort. Part of the map file and template can be found at the end of this message. ***** Map file: LAYER NAME "aanleiding" METADATA wms_title "aanleiding" END STATUS ON TYPE POLYGON DATA bis_rapv TOLERANCE 8 LABELITEM rap_code CLASS NAME "BIS Aanleiding" COLOR 0 255 0 OUTLINECOLOR 255 0 0 TEMPLATE "C:\websites\dbf_join\bis_aanleiding.htm" END JOIN TABLE "AANLEIDI.DBF" TO "RAP_CODE" NAME "bis_aanleiding_join" FROM "rap_code" END END Template file: <p class="red"> rapportcode: [rap_code] <br> </p> <p> rapportcode: [bis_aanleiding_join_RAP_CODE] <br> aanleiding: [bis_aanleiding_join_AANLEIDING] <br> </p> <p class="red"> XCOORD: [XCOORD] <br> YCOORD: [YCOORD] <br> </p>
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