Question

我正在尝试删除所有三元组，我有这些功能，

类变量

public static String defaultNameSpace = "http://www.semanticweb.org/admin/ontologies/2016/3/Inventory#";
public Model Inventario = null;
public Model schema = null;
public String DatabaseFile = "PR2INVENTARIORDFXML.owl";
public OutputStream output;

public ResultSet runQuery(String queryRequest, Model model)
{
    StringBuffer queryStr = new StringBuffer();
    ResultSet response = null;
    // Establish Prefixes
    //Set default Name space first
    queryStr.append("PREFIX base: <" + defaultNameSpace + "> ");
    queryStr.append("PREFIX rdfs: <" + "http://www.w3.org/2000/01/rdf-schema#" + "> ");
    queryStr.append("PREFIX rdf: <" + "http://www.w3.org/1999/02/22-rdf-syntax-ns#" + "> ");
    queryStr.append("PREFIX owl: <http://www.w3.org/2002/07/owl#>");

    //Now add query
    queryStr.append(queryRequest);
    Query query = QueryFactory.create(queryStr.toString());
    QueryExecution qexec = QueryExecutionFactory.create(query, model);
    try
    {
        response = qexec.execSelect();
    }
    finally { }

    return response;
}

我有每个查询的函数，这是一个例子

public ResultSet AllRecords(Model model)
{
    return runQuery("select ?s ?p ?o where{?s ?p ?o."
                    + "} " , model); 
}

当我尝试运行这些查询时

public ResultSet BorrarPC(Model model)
{
    return runQuery("DELETE {base:PC1 ?p ?o} " +
                    "WHERE {base:PC1 ?p ?o}" +
                     "" , model); 
}

public ResultSet eraseAllTriples(Model model)
{
    return runQuery("DELETE {?s ?p ?o} " +
                    "WHERE {?s ?p ?o}" +
                     "" , model); 
}

它给了我这些错误

run:

线程“main”中的异常com.hp.hpl.jena.query.QueryParseException：在第1行第233列遇到“”delete“”DELETE“”。期待以下之一： “字首” ... “选择” ... “描述”...... “构建”...... “问”......

at com.hp.hpl.jena.sparql.lang.ParserSPARQL11.perform(ParserSPARQL11.java:87)
at com.hp.hpl.jena.sparql.lang.ParserSPARQL11.parse(ParserSPARQL11.java:40)
at com.hp.hpl.jena.query.QueryFactory.parse(QueryFactory.java:132)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:69)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:40)
at com.hp.hpl.jena.query.QueryFactory.create(QueryFactory.java:28)
at explorerowlexample.FinalProject.runQuery(FinalProject.java:146)
at explorerowlexample.FinalProject.BorrarPC(FinalProject.java:90)
at explorerowlexample.FinalProject.main(FinalProject.java:56)

Java结果：1 建立成功（总时间：5秒）

如何创建删除声明？

Answer 1

SPARQL更新请求不是查询。

您需要使用更新API：请参阅UpdateExecutionFactory。

Sparql删除语句Jena OWL

1 个答案: