擼了今年阿里、頭條和美團的面試，我有一個重要發現.......>>>

插入、更新數據

public static void insert(){String query = "PREFIX book: <http://www.book.com/jinyong/> \n" +" INSERT DATA \n" +" { \n" +" <http://www.book.com/book#001> book:書名 \"天龍八部\".\n" +" <http://www.book.com/book#001> book:人物 \"喬峰\".\n" +" }";UpdateRequest updates = UpdateFactory.create(query);UpdateProcessor updateProcessor = UpdateExecutionFactory.createRemote(updates, "http://localhost:3030/test/update");updateProcessor.execute();}

更新數據操作是先刪除原先的三元組，在添加新的三元組

public static void update(){String query = "PREFIX book: <http://www.book.com/jinyong/> \n" +"DELETE \n" +"{ \n" +" <http://www.book.com/book#001> book:人物 \"喬峰\"\n" +"}\n" +"insert\n" +"{\n" +" <http://www.book.com/book#001> book:人物 \"蕭峰\"\n" +"}\n" +"where\n" +"{\n" +"\t<http://www.book.com/book#001> book:人物 \"喬峰\"\n" +"}";UpdateRequest updates = UpdateFactory.create(query);UpdateProcessor updateProcessor = UpdateExecutionFactory.createRemote(updates, "http://localhost:3030/test/update");updateProcessor.execute();}

查詢

public List<String> queryEndPoint(){String queryStr ="\n" +"SELECT ?subject ?predicate ?object\n" +"WHERE {\n" +" ?subject ?predicate ?object\n" +"}\n" +"LIMIT 25";String serviceEndPoint="http://localhost:3030/test";Query query = QueryFactory.create(queryStr);List<String> result=new ArrayList<>();try ( QueryExecution qexec = QueryExecutionFactory.sparqlService(serviceEndPoint, query) ) {ResultSet rs = qexec.execSelect();for ( ; rs.hasNext() ; ){QuerySolution soln = rs.nextSolution() ;RDFNode object = soln.get("object");RDFNode subject = soln.get("subject");RDFNode predicate = soln.get("predicate");System.out.println(object.toString()+","+subject.toString() + ","+predicate.toString());qexec.close();}} catch (Exception e) {System.out.println("aaaaaaaaaaaaa");e.printStackTrace();}return result;}

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總結

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