经过多次尝试和其他网络研究,我终于实现了自己的目标。
我决定开发一个混合解决方案,通过MS SQL Server和JDBCRealm管理用户登录和导航许可,而我使用Jena TDB来保存所有其他数据。
从RDF模式开始,我创建了一个包含资源和属性的Java类,以便通过代码轻松创建我的语句。这里有一个例子:
<rdf:RDF
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xmlns="http://www.stackoverflow.com/example#"
xml:base="http://www.stackoverflow.com/example">
<rdfs:Class rdf:ID="User"></rdfs:Class>
<rdfs:Class rdf:ID="Project"></rdfs:Class>
<rdf:Property rdf:ID="email"></rdf:Property>
<rdf:Property rdf:ID="name"></rdf:Property>
<rdf:Property rdf:ID="surname"></rdf:Property>
<rdf:Property rdf:ID="description"></rdf:Property>
<rdf:Property rdf:ID="customer"></rdf:Property>
<rdf:Property rdf:ID="insertProject">
<rdfs:domain rdf:resource="http://www.stackoverflow.com/example#User"/>
<rdfs:range rdf:resource="http://www.stackoverflow.com/example#Project"/>
</rdf:Property>
</rdf:RDF>
这是Java类:
public class MY_ONTOLOGY {
private static final OntModel M = ModelFactory.createOntologyModel(OntModelSpec.RDFS_MEM);
private static final String NS = "http://www.stackoverflow.com/example#";
private static final String BASE_URI = "http://www.stackoverflow.com/example/";
public static final OntClass USER = M.createClass(NS + "User");
public static final OntClass PROJECT = M.createClass(NS + "Project");
public static final OntProperty EMAIL = M.createOntProperty(NS + "hasEmail");
public static final OntProperty NAME = M.createOntProperty(NS + "hasName");
public static final OntProperty SURNAME = M.createOntProperty(NS + "hasSurname");
public static final OntProperty DESCRIPTION = M.createOntProperty(NS + "hasDescription");
public static final OntProperty CUSTOMER = M.createOntProperty(NS + "hasCustomer");
public static final OntProperty INSERTS_PROJECT = M.createOntProperty(NS + "insertsProject");
public static final String getBaseURI() {
return BASE_URI;
}
}
然后,我已经建立了我的电脑上的目录,我想存储数据,如C:\MyTDBdataset
。
要存储的数据里面,我使用下面的代码:
String directory = "C:\\MyTDBdataset";
Dataset dataset = TDBFactory.createDataset(directory);
dataset.begin(ReadWrite.WRITE);
try {
Model m = dataset.getDefaultModel();
Resource user = m.createResource(MY_ONTOLOGY.getBaseURI() + "Ronnie", MY_ONTOLOGY.USER);
user.addProperty(MY_ONTOLOGY.NAME, "Ronald");
user.addProperty(MY_ONTOLOGY.SURNNAME, "Red");
user.addProperty(MY_ONTOLOGY.EMAIL, "ronni[email protected]");
Resource project = m.createResource(MY_ONTOLOGY.getBaseURI() + "MyProject", MY_ONTOLOGY.PROJECT);
project.addProperty(MY_ONTOLOGY.DESCRIPTION, "This project is fantastic");
project.addProperty(MY_ONTOLOGY.CUSTOMER, "Customer & Co");
m.add(user, MY_ONTOLOGY.INSERTS_PROJECT, project);
dataset.commit();
} finally {
dataset.end();
}
如果我想读我的TDB的语句,我可以使用这样的事情:
dataset.begin(ReadWrite.READ);
try {
Model m = dataset.getDefaultModel();
StmtIterator iter = m.listStatements();
while (iter.hasNext()) {
Statement stmt = iter.nextStatement();
Resource subject = stmt.getSubject();
Property predicate = stmt.getPredicate();
RDFNode object = stmt.getObject();
System.out.println(subject);
System.out.println("\t" + predicate);
System.out.println("\t\t" + object);
System.out.println("");
}
m.write(System.out, "RDF/XML"); //IF YOU WANT TO SEE AT CONSOLE YOUR DATA AS RDF/XML
} finally {
dataset.end();
}
如果您想要以不同的方式浏览您的模型,请参阅Apache提供的tutorial。
如果要删除模型中的特定声明,你可以写这样的事情:
dataset.begin(ReadWrite.WRITE);
try {
Model m = dataset.getDefaultModel();
m.remove(m.createResource("http://http://www.stackoverflow.com/example/Ronnie"), MY_ONTOLOGY.NAME, m.createLiteral("Ronald"));
dataset.commit();
} finally {
dataset.end();
}
这一切!再见!
欢迎使用stackoverflow。请花点时间跟随[旅游]了解您可以提出什么样的问题,不能在这里问。你的问题是无关紧要的,因为它要求非现场资源,并且删除它太广泛。 – Gimby
我已阅读欢迎指南,我认为我的问题不是基于意见,而是与实际问题相关,并且在此网站中不存在解决方案。 – ronnie
@Gimby很有礼貌。显示你做了什么;显示缺少的东西;显示你试图做的事情没有奏效;问一个关于如何使失踪位工作的具体问题。 –