我正在使用SPARQL将三元组数据插入到IRI中。
这是我的代码，
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.StringWriter;
import java.util.Iterator;
import com.hp.hpl.jena.graph.Graph;
import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.graph.Triple;
import com.hp.hpl.jena.query.Query;
import com.hp.hpl.jena.query.QueryFactory;
import com.hp.hpl.jena.query.QuerySolution;
import com.hp.hpl.jena.query.ResultSet;
import com.hp.hpl.jena.rdf.model.Model;
import com.hp.hpl.jena.rdf.model.ModelFactory;
import com.hp.hpl.jena.rdf.model.RDFNode;
import virtuoso.jena.driver.VirtGraph;
import virtuoso.jena.driver.VirtuosoQueryExecution;
import virtuoso.jena.driver.VirtuosoQueryExecutionFactory;
import virtuoso.jena.driver.VirtuosoUpdateFactory;
import virtuoso.jena.driver.VirtuosoUpdateRequest;
public class VirtuosoSPARQLExample9 {
/**
* Executes a SPARQL query against a virtuoso url and prints results.
* @throws FileNotFoundException
*/
public static void main(String[] args) throws FileNotFoundException {
String url;
if(args.length == 0)
url = "jdbc:virtuoso://192.168.99.100:1111";
else
url = args[0];
/* STEP 1 */
VirtGraph set = new VirtGraph (url, "dba", "dba");
/* STEP 2 */
String str = "CLEAR GRAPH <http://192.168.99.100/test1>";
VirtuosoUpdateRequest vur = VirtuosoUpdateFactory.create(str, set);
vur.exec();
// InputStream in = new FileInputStream("src/main/webapp/resources/outputfile/test.ttl");
// Model model1 = ModelFactory.createDefaultModel(); // creates an in-memory Jena Model
// model1.read(in, null, "TURTLE");
// StringWriter out = new StringWriter();
// model1.write(out, "TURTLE");
str = "INSERT INTO GRAPH <http://192.168.99.100/test1> { @base <http://example.org/> .\r\n" +
"@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .\r\n" +
"@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .\r\n" +
"@prefix foaf: <http://xmlns.com/foaf/0.1/> .\r\n" +
"@prefix rel: <http://www.perceive.net/schemas/relationship/> .\r\n" +
"\r\n" +
"<#green-goblin>\r\n" +
" rel:enemyOf <#spiderman> ;\r\n" +
" a foaf:Person ; # in the context of the Marvel universe\r\n" +
" foaf:name \"Green Goblin\" .\r\n" +
"\r\n" +
"<#spiderman>\r\n" +
" rel:enemyOf <#green-goblin> ;\r\n" +
" a foaf:Person ;\r\n" +
" foaf:name \"Spiderman\", \"Человек-паук\"@ru . };";
vur = VirtuosoUpdateFactory.create(str, set);
vur.exec();
/* Select all data in virtuoso */
Query sparql = QueryFactory.create("SELECT * FROM <http://test1> WHERE { ?s ?p ?o }");
VirtuosoQueryExecution vqe = VirtuosoQueryExecutionFactory.create (sparql, set);
ResultSet results = vqe.execSelect();
System.out.println("\nSELECT results:");
while (results.hasNext()) {
QuerySolution rs = results.nextSolution();
RDFNode s = rs.get("s");
RDFNode p = rs.get("p");
RDFNode o = rs.get("o");
System.out.println(" { " + s + " " + p + " " + o + " . }");
}
sparql = QueryFactory.create("DESCRIBE <http://aa> FROM <http://test1>");
vqe = VirtuosoQueryExecutionFactory.create (sparql, set);
Model model = vqe.execDescribe();
Graph g = model.getGraph();
System.out.println("\nDESCRIBE results:");
for (Iterator i = g.find(Node.ANY, Node.ANY, Node.ANY); i.hasNext();)
{
Triple t = (Triple)i.next();
System.out.println(" { " + t.getSubject() + " " +
t.getPredicate() + " " +
t.getObject() + " . }");
}
sparql = QueryFactory.create("CONSTRUCT { ?x <http://test> ?y } FROM <http://test1> WHERE { ?x <http://bb> ?y }");
vqe = VirtuosoQueryExecutionFactory.create (sparql, set);
model = vqe.execConstruct();
g = model.getGraph();
System.out.println("\nCONSTRUCT results:");
for (Iterator i = g.find(Node.ANY, Node.ANY, Node.ANY); i.hasNext();)
{
Triple t = (Triple)i.next();
System.out.println(" { " + t.getSubject() + " " +
t.getPredicate() + " " +
t.getObject() + " . }");
}
sparql = QueryFactory.create("ASK FROM <http://test1> WHERE { <http://aa> <http://bb> ?y }");
vqe = VirtuosoQueryExecutionFactory.create (sparql, set);
boolean res = vqe.execAsk();
System.out.println("\nASK results: "+res);
}
}
运行查询时出现错误，
at virtuoso.jena.driver.VirtuosoUpdateRequest.exec(Unknown Source)
at com.bordercloud.sparql.virtuoso.VirtuosoSPARQLExample9.main(VirtuosoSPARQLExample9.java:70)
Caused by: virtuoso.jdbc3.VirtuosoException: SQ074: Line 16: SP030: SPARQL compiler, line 2: syntax error at '@base' before '<http://example.org/>'
at virtuoso.jdbc3.VirtuosoResultSet.process_result(Unknown Source)
at virtuoso.jdbc3.VirtuosoResultSet.<init>(Unknown Source)
at virtuoso.jdbc3.VirtuosoStatement.sendQuery(Unknown Source)
at virtuoso.jdbc3.VirtuosoStatement.execute(Unknown Source)
... 2 more
当我运行示例示例时，我正在使用virtuoso Jena示例，该示例在链接Viruoso Jena example上给出，它将完美运行且没有错误。我添加了rdf triples data作为示例，其中包含前缀没有完美地跑步，我收到了错误。
另外，如果有任何方法可以使用SPARQL查询将RDF数据文件（test.ttl）直接加载到virtuoso服务器，这对我来说非常有用。
提前感谢您的帮助。
答案 0 :(得分：0)
您的Jena INSERT失败，因为当该内容包含INSERT，@base以及其他各种内容时，SPARQL不允许您@prefix {完成Turtle文件的内容}的东西。
对于您的基本问题，正如我之前在其他地方回答的那样，有MANY documented ways to load data into Virtuoso。
根据您在此处提出的具体问题，您可以使用SPARQL LOAD功能，如果您要加载的文件是可访问的通过HTTP或其他支持Virtuoso的URI。 file: scheme URIs (as @AKSW shows) are supported 如果该文件是Virtuoso实例的本地文件 - 即，如果它位于Virtuoso本地文件系统上，而不是任何远程客户端主机 - 并且 if 包含目录包含在DirsAllowed setting of the [Parameters] stanza的值中。
LOAD <file:///path_to_your_file.ttl> INTO GRAPH <http://192.168.99.100/test1>
我强烈建议你read the documentation。它确实回答了很多问题。