-- 作者：admin
-- 发布时间：11/18/2010 10:06:00 AM
-- 网友《关于sparql查询》
通过自己的努力和查阅sparql学习资料，最后查询得到了自己想要的结果，只是不知道本体是否正确，这个结果的得出离不开w3china.org网站的帮助，下面把自己的结果贴出来 1.查询一个类所有的子类 String name="ToCool";
PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX xsd:<http://www.w3.org/2000/10/XMLSchema#> PREFIX owl:<http://www.w3.org/2002/07/owl#>
PREFIX rdfs:<http://www.w3.org/2000/01/rdf-schema#>
PREFIX base:<http://www.hozo.jp/rdf/MakingCoolFun.ont>
PREFIX eg:<http://www.hozo.jp/owl/MakingCoolFun.owl#>
SELECT ?x
WHERE {
?x rdfs:subClassOf eg:name //name可以根据实际的查询给定，例子中是查询ToCool的所有子类
} 查询结果: ToHeat-Pressure
ToPurify
ToCondensation
ToThrottle
ToVaporize
ToRecycle 2.根据设备查功能或根据功能查找设备 String name="eg:Compressor";
PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX xsd:<http://www.w3.org/2001/XMLSchema#>
PREFIX xsd:<http://www.w3.org/2000/10/XMLSchema#>
PREFIX owl:<http://www.w3.org/2002/07/owl#>
PREFIX rdfs:<http://www.w3.org/2000/01/rdf-schema#>
PREFIX base:<http://www.hozo.jp/rdf/MakingCoolFun.ont>
PREFIX eg:<http://www.hozo.jp/owl/MakingCoolFun.owl#>
SELECT ?Class WHERE {
?x rdf:type owl:Restriction.
?x owl:onProperty eg:has_essential_function.
?x owl:allValuesFrom ?Class.
name rdfs:subClassOf ?x.//例子中是查询压缩机的本质功能是什么，结果是ToHeat-Pressure
} 3.这个例子是在java环境中运行，用jena API解析，完整代码如下 OntModel model = ModelFactory.createOntologyModel( OntModelSpec.OWL_MEM, null );
try {
model.read(new FileInputStream("E:\\MakingCoolFun.owl"), "");
} catch (FileNotFoundException e) {
System.out.println(e.toString());
} String name="ToCool";
String prefix="PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#>"+
"PREFIX xsd:<http://www.w3.org/2000/10/XMLSchema#>"+
"PREFIX owl:<http://www.w3.org/2002/07/owl#>"+
"PREFIX rdfs:<http://www.w3.org/2000/01/rdf-schema#>"+
"PREFIX base:<http://www.hozo.jp/rdf/MakingCoolFun.ont>"+
"PREFIX eg:<http://www.hozo.jp/owl/MakingCoolFun.owl#>";
String strquery="SELECT ?x "+"\n"+
" WHERE { "+
"?x rdfs:subClassOf eg:"+name+
"}";
Query query=QueryFactory.create(prefix+strquery); QueryExecution qe=QueryExecutionFactory.create(query,model);
ResultSet results=qe.execSelect(); //输出结果，这样可以去掉前缀
while (results.hasNext()) {
QuerySolution soln = results.nextSolution(); //查询结果中的每一条（称之为满足条件的一个solution）
String s = soln.get("x").toString();
StringTokenizer token = new StringTokenizer(s,"#");
token.nextToken();
System.out.println(token.nextToken());
}
qe.close();
转自：http://hi.baidu.com/springbird/blog/item/3603f211c2292ccca6ef3fcb.html
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