I am sorry Lorenz sir, Basically what I want to sum a team wins. When value is entered in text field, it is saved as data property "Wins" value in the file i-e team1 Wins 3. Since this value 3 is stored in owl file, when another entry is made for Wins property, say 2, I want to sum this new value with the previous value of Wins property so that it does not stored in the file as: team1 wins 2 team1 wins 3
*but rather it is stored as:* *team1 wins 5* // variable is java variable having integer value i-e 2 *Literal wins=model.createTypedLiteral(variable);* *int win_value=wins.getInt();* *I just want to sum win_value (i-e 2) with the value in data property "Wins"* OntProperty winsProperty = model.getOntProperty(ns+ "Wins"); So without SPARQL, can we get integer value of data property Wins so that we can do int total_wins= win_value+ (The value from data property Wins). Sorry again for these types of questions, but I am learning Jena course my own and I have not studied it in my Bachelor degree (But have to use it in my BS project) On Sat, Oct 1, 2016 at 7:07 AM, Lorenz B. < [email protected]> wrote: > What the hell are you doing here?! Javadoc + Jena documentation is your > friend. > > It does not fetch any data, but creates a property and a literal with > the value that is the property object which is totally wrong. > > First, use proper variable names. > > > > Is this a proper way to fetch the int value from data property? > > > > OntProperty value=model.getOntProperty(ns+ "Wins"); > Obviously, this line creates a property object, i.e. call it "property" > or "p" or "winsProperty" or whatever, but not value. > > OntProperty winsProperty = model.getOntProperty(ns+ "Wins"); > > > > > > Literal myliteral = model.createTypedLiteral(value); > This line creates a Literal object whose value is the property object, > but that's totally wrong. If you want to create an int literal, use an > integer as argument > > Literal myliteral = model.createTypedLiteral(3); > > > > > > > int sum=myliteral.getInt(); > Again weird naming of Java variables which makes the code unreadable and > even more nobody will understand what you want to achieve. > The sum of what? > > sum=sum+1; > > It should be clear that data is assigned to RDF resources, that means > you need a resource as well ,that's why the RDF data model is made of > triples (subject, predicate, object), and from the above code you only > have predicate and object. > > -- > Lorenz Bühmann > AKSW group, University of Leipzig > Group: http://aksw.org - semantic web research center > >
