生成增量SPARQL查詢

Question

有什么方法可以動態生成SPARQL查詢嗎？ 我想做的是這樣的：如果我有一個DBpedia資源r1和另一個DBpedia資源r2，則此查詢

SELECT * WHERE { <r1> ?pre <r2> }

將返回2個資源與該查詢之間的謂詞

SELECT * WHERE { <r1> ?pre1 ?obj1 . ?obj1 ?pre2 <r2> }

會在兩個步驟中返回這兩個資源之間的所有謂詞和對象，依此類推，我試圖以這種方式構建此查詢，該查詢將自動增加兩個資源之間的對象和謂詞的數量（例如4個步驟）？

Answer 1

我想出了解決這個問題的方法..這是我的解決方案：

private String completeQuery(String coreQuery){
String completeQuery = "";
completeQuery += "SELECT * WHERE {"+ "\n";
completeQuery += coreQuery + "\n";
completeQuery =completeQuery + "}" + "\n" +"limit 5" ;
return completeQuery;}
public String link(String object1, String object2, int distance){
if(distance == 1){
    String Quer = "<http://dbpedia.org/resource/"+object1+">" + " ?pre1 " +"<http://dbpedia.org/resource/"+object2+">";
    return completeQuery(Quer);
} 
else {
    String query = "<http://dbpedia.org/resource/"+object1+">" + " ?pre1 ?obj1 " + ".\n";
    for(int i = 1; i < distance-1; i++){
        query += "?obj" + i + " ?pre" + (i+1) + " ?obj" + (i+1) + ".\n" ;

    }
    query  += "?obj" + (distance-1) + " ?pre" + distance + " " + "<http://dbpedia.org/resource/"+object2+">";
    return completeQuery(query);
}}