Thanks for your answer, but how to query when I don't know the object value.I want to query the latest insert object value, without deleting the data inserted before .
[email protected] From: Andy Seaborne Date: 2015-01-06 17:39 To: users Subject: Re: How to query the latest insert data from TDB dataset On 06/01/15 01:21, [email protected] wrote: > I have insert three statments : subject="ind1" predicate="intID" object=0,1,2 > into my TDB dataset,and I want to select the latest insert data "2",but the > dataset reply all the data. > Here is the query part: > dataset.begin(ReadWrite.READ); > model=dataset.getNamedModel("http://www.semanticweb.org/HRAtest01.owl#";); > String qs1 = "SELECT ?x WHERE { > <http://www.semanticweb.org/HRAtest01.owl#"+sub+";> > <http://www.semanticweb.org/HRAtest01.owl#"+pre+";> ?x }"; SELECT ?x { <...> <...> ?x . FILTER (?x = 2 ) } though if you know the answer is 2 ASK{ { <...> <...> 2 } return true/false depending on presence of that triple. Andy > QueryExecution qExec=QueryExecutionFactory.create(qs1, model); > try { > ResultSet rs = qExec.execSelect() ; > ResultSetFormatter.out(rs) ; > } > finally > { > qExec.close() ; > } > the answer: > ----- > | x | > ===== > | 0 | > | 1 | > | 2 | > ----- >
