Filter and CQL are only predicate languages. The WFS spec allows you to chose which feature properties to return by means of the propertyName=<property1>[,propertyN]+ parameter for a GetFeature request using HTTP GET method, or the ogc:PropertyName inside the wfs:Query element in an XML GetFeature request using HTTP POST method (perhaps a mixin of both is allowed? don't recall).
In any case, take a look at the demo requests in your geoserver default install, and check out the OGC WFS 1.1 specification [1] for more detail on how to perform data queries. Hope that helps, Gabriel. [1] <http://portal.opengeospatial.org/files/?artifact_id=8339> On Tue, Apr 17, 2012 at 1:50 PM, Zheng Xudong <[email protected]> wrote: > Hi all, > > I use postgis as my spatial database, and the table contains many columns, > then when I get the features may lead more overhead of database operation > and network communication. But not every columns is really needed for my > each operation. So I want to know, could I choose some columns by Filter or > CQL when I getting features? It seems that there are no these type of Filter > or CQL syntax, then could I have any other solutions? > > Thanks in advance. > > -- > Zheng Xudong > State Key Laboratory of Software Development Environment > School of Computer Science and Engineer, BeiHang University > > ------------------------------------------------------------------------------ > Better than sec? Nothing is better than sec when it comes to > monitoring Big Data applications. Try Boundary one-second > resolution app monitoring today. Free. > http://p.sf.net/sfu/Boundary-dev2dev > _______________________________________________ > GeoTools-GT2-Users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users > -- Gabriel Roldan OpenGeo - http://opengeo.org Expert service straight from the developers. ------------------------------------------------------------------------------ Better than sec? Nothing is better than sec when it comes to monitoring Big Data applications. Try Boundary one-second resolution app monitoring today. Free. http://p.sf.net/sfu/Boundary-dev2dev _______________________________________________ GeoTools-GT2-Users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
