将我的rdf文件转换为命名的图形文件 [英] transform my rdf file to a named graph file

问题描述

对于一个项目，我必须使用Apache Jena作为API，并使用Blazegraph作为三重存储，我正在尝试编写一个代码，该代码允许我将数据集(N-Triples File)转换为包含NamedGraph的文件.每个声明.

For a project I have to use Apache Jena as an API and Blazegraph as a triple store, I am trying to program a code that allows me to transform my dataset (N-Triples File) to a file that contains the NamedGraph of each statement.

String APIUrl = "http://localhost:9999/bigdata/namespace/drugbank/sparql";
String req = "select * WHERE {?x ?y ?z}";

RDFConnection conn = RDFConnectionFactory.connect(APIUrl);
FileManager.get().addLocatorClassLoader(Main.class.getClassLoader());
Model model = FileManager.get().loadModel("drugbank.nt",null,"NTRIPLES");
conn.load(model);

Query query = QueryFactory.create(req);
QueryExecution qexec = QueryExecutionFactory.create(query,model);
    try {
        ResultSet rs = qexec.execSelect();

        Model m1 = RDFOutput.encodeAsModel(rs);
        StmtIterator iter = m1.listStatements();

        int i=0;
        final Model mStat = ModelFactory.createDefaultModel();
        while (iter.hasNext()) {
            i++;
            Statement stmt      = iter.nextStatement() ;
            // code for named Graph
        }
   }catch(Exception){

    }

推荐答案

您可以将模型直接加载到远程命名图:

You can load the model directly to a remote named graph:

conn.load(model);加载默认图形.

conn.load(graphName, model);加载命名图.

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