WFS for advanced queries ?

[Kralidis,Tom [Burlington]]

Ah, ok.  For that kind of scenario (and I want to find :"The Road with name X which Cities crosses ?"), you could:

- query a roads WFS to get geometry
- pass these geometries to a WFS Intersect filter to seek
 
..Tom



________________________________

	From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On Behalf Of korakas koarkis
	Sent: 16 February, 2007 9:45 AM
	To: MAPSERVER-USERS at LISTS.UMN.EDU
	Subject: Re: [UMN_MAPSERVER-USERS] WFS for advanced queries ?
	
	
	To setup database views is an option BUT has several limitations:
	1) I must know in advance the queries that the user will issue
	2) I dont know what happens with db perfomance: Consider that there will be a great volume of data in terms of tables and content of the tables.
	
	My goal is to act as a content provider with an API for visualazation and querying.
	I consider OGC through WMS and WFS but if understood correctly WFS cannot fullfill my needs... (right??)
	
	For example lets say that I have two tables Cities and Roads
	and I want to find :"The Road with name X which Cities crosses ?"
	
	and then HighLight these cities!
	
	This query can be supported in MapServer ?
	
	
	
	"Bart van den Eijnden (OSGIS)" <bartvde at OSGIS.NL> έγραψε: 

		WFS won't allow you currently to do advanced queries.
		
		If your queries are known beforehand, you can setup database views and use
		those views as a typename in WFS.
		
		If that's not possible, you need a more direct way of controlling your
		queries, Mapscript could be an option then (setting the DATA statement
		dynamically on a LAYER).
		
		Best regards,
		Bart
		
		--
		Bart van den Eijnden
		OSGIS, Open Source GIS
		http://www.osgis.nl
		
		
		--------- Oorspronkelijk bericht --------
		Van: korakas koarkis 
		Naar: MAPSERVER-USERS at LISTS.UMN.EDU 
		Onderwerp: [UMN_MAPSERVER-USERS] WFS for advanced queries ?
		Datum: 16/02/07 12:15
		
		> Hi all,I have a PostGIS installed, and I want to setup above a Framework
		for  visualization and advanced querying the of data. (By the term
		advanced I mean inner/outer join etc)I was thinking to use UMN Mapserver
		with OCG standards:*) WMS for visualization and*) WFS for quering the
		dataDoes MapServer handles advanced querying through WFS, or do I have to
		consider some other API (MapScript) ?ThxKio 
		> 
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