Re: [Geoserver-users] Getting started with WFS

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Hi,

Perhaps you just cannot use IsLike filter with wildcard against numeric field. The query itself looks OK to me but I am not good in reading xml. I add to the bottom of my message a valid request that is created by a GIS software so you can compare it. Otherwise I suggest you to 
- make a IsLike with wildcard first against a string attribute
- when it works have a try with a numeric attribute
- if it fails make a new pair of filters
</ogc:PropertyIsLessThan>
<ogc:PropertyIsGreaterThanOrEqualTo>

And here is an IsLike filter which should work.

<?xml version="1.0" encoding="ISO-8859-1"?>
<wfs:GetFeature xmlns:ogc="http://www.opengis.net/ogc" xmlns:gml="http://www.opengis.net/gml" xmlns:wfs="http://www.opengis.net/wfs" service="WFS" version="1.0.0" maxFeatures="1000" outputFormat="GML2">
<wfs:Query xmlns:topp="http://www.openplans.org/topp" srsName="EPSG:4326" typeName="topp:states">
<ogc:Filter>
<ogc:PropertyIsLike wildCard="*" singleChar="#" escape="!" matchCase="true">
<ogc:PropertyName xmlns:topp="http://www.openplans.org/topp">
topp:LAND_KM</ogc:PropertyName>
<ogc:Literal>
<![CDATA[2000*]]>
</ogc:Literal>
</ogc:PropertyIsLike>
</ogc:Filter>
</wfs:Query>
</wfs:GetFeature>

-Jukka Rahkonen-

-----Alkuperäinen viesti-----
Lähettäjä: Nosaj [mailto:jt...@ya...]
Lähetetty: to 24.12.2009 17:04
Vastaanottaja: geo...@li...
Aihe: [Geoserver-users]  Getting started with WFS

As a GIS profesional but not a programmer, I  am slowly learing to use
Geoserver and OpenLayers, and learning some javascipt.    I have learned to
add shapefiles and display in a webmap map and  make the GetFeatureInfo work
in an html page so that a user can click on a feature and get information
about it.  However, I am stuck at trying to learn WFS  so that I create
queries to filter for certain data that can be displayed inmy maps.   I have
gone through the Penn State Open Web Mapping course that somene recommended
in an earlier post.  It explains how to create a query filter in general but
I can't seem to figure out how to use a filter within the context of the
whole code for a web map. In other workds, where is the query filter to be
placed.  I am also stuck on figuring out how to use the Geoserver WFS sample
requests.  

Basically what I would like to be able to is use a shapefile which has
several polygon features (lakes and ponds) of various sizes, and be able to
query for features with of a certain size using an area (in acres)  field.  

Here is the filter that I came up with that I think I want to use to find a
polygon feature of a certain size. I used the wildcard so I could be less
specific since the acres field data has 4 digits past the decimal point.  I
just don't know where to put it and what else must be included in order for
the filter to work. 

<wfs:GetFeature  service="WFS" version="1.0.0"
     outputFormat="GML2"
      xmlns:topp="http://www.openplans.org/topp"
      xmlns:wfs="http://www.opengis.net/wfs"
      xmlns:ogc="http://www.opengis.net/ogc"
      xmlns:gml="http://www.opengis.net/gml"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.opengis.net/wfs
        http://schemas.opengis.net/wfs/1.0.0/WFS-basic.xsd">
     <wfs:Query  typeName="topp:water_trial">
      <ogc:PropertyName>topp:water_trial</ogc:PropertyName> 
   <ogc:Filter>
   <ogc:PropertyIsLike  wildCard="*" singleChar="." escape="!">
   <ogc:PropertyName>topp:ACRES</ogc:PropertyName>
   <ogc:Literal>2249494*</ogc:Literal>
   </ogc:PropertyIsLike>
   </ogc:Filter>
     </wfs:Query>

Thanks,

Jason
-- 
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Sent from the GeoServer - User mailing list archive at Nabble.com.

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