You have to get the "wins" value for "team1" first, then set the new "wins" value for "team1" . That means you first have to get the "team1" individual/resource.
RDF data model: team1 wins 3 team1 = is an individual resp. a resource wins = is a data property 3 = is a literal value > 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 >> >> -- Lorenz Bühmann AKSW group, University of Leipzig Group: http://aksw.org - semantic web research center
