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我在我的数据集中有很多模型,我想查询指定的模型,我在SPARQL查询中使用了graph关键字,但它给了我一个空结果集 任何人都可以帮助我, ?从TDB中的数据集查询模型
public static void SparqlForSentencesDuplicates()
{
String querystr= "PREFIX aapi:<http://rdf.alchemyapi.com/rdf/v1/s/aapi-schema#> "
+ "select ?s where {"
+"graph <RelationModel3> {"
+ "?id aapi:RelationSentence ?s } "
+"}";
Dataset ds=tdbconn.ds;
ds.begin(ReadWrite.READ);
QueryExecution qexe= QueryExecutionFactory.create(querystr, ds);
try {
ResultSet result= qexe.execSelect();
ResultSetFormatter.out(result);
}finally{
qexe.close();
ds.close();
}
}
,并在这里,我怎么能加载模型
public Model loadModel(String modelName, StringBuilder Builder)
{
Model model = null;
ds.begin(ReadWrite.WRITE);
try
{
//model = ds.getNamedModel(modelName);
model = ModelFactory.createDefaultModel();
model.read(new ByteArrayInputStream(Builder.toString().getBytes()), null);
ds.addNamedModel(modelName, model);
ds.commit();
}
finally
{
ds.end();
} return model;}