Hello Andy,
The prefixes.dat is zero.
For reference, I use tbdloader2 (I believe it is better than tdbloader), and it
uses a rdf file to populate the tdb
I used your code and it worked quite well. I managed to retrieve the prefixes,
and the prefixes.dat is not zero now
So I guess this piece of code is a work around to the issue with bulkloader.
cheers,
Emilio
On 12 Apr 2012, at 11:53, Andy Seaborne wrote:
> On 11/04/12 14:58, Emilio Miguelanez wrote:
>> Hi,
>>
>> How can I get the prefixes from the TDB store using latest tdb version 0.9.0?
>>
>> Previously, using version 0.8.10, I managed to get the prefixes using the
>> following code
>>
>> Model bModel = TDBFactory.createModel(repoDir);
>> OntModel aModel = ModelFactory.createOntologyModel(spec, bModel);
>> Map<String, String> prefixMap = new HashMap<String, String>();
>> prefixMap = aModel.getNsPrefixMap();
>>
>>
>> Now, with the latest version and in order to support transactions, the code
>> has changed to:
>>
>> Dataset aDataset = TDBFactory.createDataset(repoDir);
>> Map<String, String> prefixMap = new HashMap<String, String>();
>> Model model = dataset.getDefaultModel();
>> prefixMap = model.getNsPrefixMap();
>>
>> but it doesn't retrieve all prefixes from the model.
>>
>> Should I use a different method or API to retrieve the prefixes stored in
>> the tdb?
>>
>>
>> Cheers,
>> Emilio
>
> Hi there,
>
> There is a problem with the bulkloader (see JIRA JENA-175).
>
> Could you look in the DB directory and see if the prefixes.dat is zero or not?
>
> I tried the code below and (on a disk-backed database) and it printed the
> prefixes:
>
> Andy
>
>
> -----------------------------
> package dev;
>
> import java.util.Map ;
>
> import org.openjena.atlas.lib.FileOps ;
> import org.openjena.riot.SysRIOT ;
>
> import com.hp.hpl.jena.query.Dataset ;
> import com.hp.hpl.jena.query.DatasetFactory ;
> import com.hp.hpl.jena.query.ReadWrite ;
> import com.hp.hpl.jena.shared.PrefixMapping ;
> import com.hp.hpl.jena.sparql.core.DatasetGraph ;
> import com.hp.hpl.jena.sparql.core.DatasetPrefixStorage ;
> import com.hp.hpl.jena.tdb.TDB ;
> import com.hp.hpl.jena.tdb.TDBFactory ;
> import com.hp.hpl.jena.tdb.store.DatasetGraphTDB ;
> import com.hp.hpl.jena.tdb.sys.DatasetControlNone ;
> import com.hp.hpl.jena.tdb.sys.SetupTDB ;
> import com.hp.hpl.jena.tdb.transaction.DatasetGraphTransaction ;
> import com.hp.hpl.jena.util.FileManager ;
>
> public class Jena_TDB_prefixes
> {
> public static void main(String ... argv)
> {
> FileOps.clearDirectory("DB") ;
> SysRIOT.wireIntoJena() ;
> DatasetGraphTransaction dsg =
> (DatasetGraphTransaction)TDBFactory.createDatasetGraph("DB") ;
> Dataset ds = DatasetFactory.create(dsg) ;
> ds.begin(ReadWrite.WRITE) ;
> FileManager.get().readModel(ds.getDefaultModel(), "D.ttl") ;
> ds.commit() ;
> ds.end() ;
>
> System.out.println("Prefixes (DS):") ;
>
> DatasetPrefixStorage prefixes = SetupTDB.makePrefixes(dsg.getLocation(),
> new DatasetControlNone()) ;
> for ( String gn : prefixes.graphNames() )
> {
> System.out.println("Graph: "+gn) ;
> PrefixMapping pmap = prefixes.getPrefixMapping(gn) ;
> Map<String, String> x = pmap.getNsPrefixMap() ;
> for ( String k : x.keySet() )
> System.out.printf(" %-10s %s\n", k+":", x.get(k)) ;
> }
>
>
> System.out.println("Prefixes (dft model):") ;
> ds.begin(ReadWrite.READ) ;
> Map<String, String> mapping = ds.getDefaultModel().getNsPrefixMap() ;
> System.out.println(mapping) ;
>
> ds.end() ;
> }
> }
>
> -----------------------------
> ---- D.ttl
> @prefix dc: <http://purl.org/dc/elements/1.1/> .
> @prefix ns: <http://example.org/ns#> .
>
> @prefix : <http://example.org/book/> .
>
> :s :p :o .
>
