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Flex WFS Query

by | Oct 22, 2010 | Location Technology Solutions | 0 comments

Working with Openscales – the Flex open source mapping API – I’ve been querying Geoserver using WFS GET parameters. But I have found some issues both with building the query and response times.

Flex GeoServer – WFS Query

The OGC WFS filter looks like this:

http://server/geoserver/wfs?request=getfeature&service=wfs&version=1.1.1&outputformat=GML3&typename=Sun:AddrPts_City&Filter=ADDRKEY12203

Looks simple, but try adding AND OR to this and life becomes very complex. Plus the response times were 20 secs plus, just for this type of simple query. CQL or Common Query Language is a much better way to go. The above query looks like this in CQL:

http://server/geoserver/wfs?request=getfeature&service=wfs&version=1.1.1&outputformat=GML3&typename=Sun:AddrPts_City&propertyname=ADDRESS,PARCEL_NO,ADDRKEY&CQL_FILTER=ADDRKEY=12203

Much simpler. And by adding the propertyname parameter and limiting these fields, we have a response time of 7 secs!

Related Resources

Contact us to learn more about Openscales.


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