Yep this is a pain, only a few implementations support user defined feature
ids.
There are two things:
- check the capabilities of the datastore to see if it supports this
functionality
- use a "user data" hint to enable the extra functionality
Here is the example from the documentation:
if( featureStore.getQueryCapabilities().isUseExisingFIDSupported() ){ //
featureStore allows us to create our own featureIDs SimpleFeatureBuilder b =
new SimpleFeatureBuilder(featureStore.getSchema()); DefaultFeatureCollection
collection = new DefaultFeatureCollection(null,featureStore.getSchema());
String typeName = b.getFeatureType().getTypeName(); for( FeatureIterator
iter=features.features(); iter.hasNext(); ){ SimpleFeature feature =
(SimpleFeature) iter.next(); b.init( feature ); // take feature into a builder
to modify b.featureUserData(Hints.USE_EXISTING_FID, Boolean.TRUE); feature =
b.buildFeature( typeName+"."+System.currentTimeMillis() ); collection.add(
feature ); } featureStore.addFeatures(collection); } else { // allow
featurestore to create featureIDs featureStore.addFeatures( features ); }
And the link:
http://docs.geotools.org/latest/userguide/library/data/featuresource.html#adding-data
--
Jody Garnett
On Monday, 3 December 2012 at 10:38 PM, Fritz Richter wrote:
> Hi together,
> I'm playing around now for hours an simply can not make it run.
>
> I try to store a feature into postgis, which is almost working perfectly,
> except the feature id.
>
> Polygon polygon = GisUtils.convertToPolygon(tile);
> builder.set("updated", new Date());
> builder.set("geom", polygon);
> ...
> SimpleFeature feature = builder.buildFeature(featureId);
>
>
> In my case the featureID is set to "18/12/12". When I look into the database
> table, the id looks like this "fid--50250c12_13b60c20cc4_-7061".
> I really do not know, why my featureId is not used but the stange id appears.
>
> Any help?
>
> My db definition looks like this:
> CREATE TABLE result
> (
> tile_id text NOT NULL,
> updated timestamp without time zone NOT NULL,
> geom geometry,
> ...
> CONSTRAINT pk_result PRIMARY KEY (tile_id ),
> CONSTRAINT enforce_dims_geom CHECK (st_ndims(geom) = 2),
> CONSTRAINT enforce_geotype_geom CHECK (geometrytype(geom) = 'POLYGON'::text
> OR geom IS NULL),
> CONSTRAINT enforce_srid_geom CHECK (st_srid(geom) = 4326)
> )
> WITH (
> OIDS=FALSE
> );
> ALTER TABLE result
> OWNER TO postgres;
>
>
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