eclipse - How to Count the number of rows in Sparql Query -

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i working in eclipse , using 2 java files: admin.java , semanticsearch.java. through the admin.java logging in , checking if username , password existing in rdf file. function of login in admin.java calls semanticsearch.java runs sparql query. query giving me answer in console of eclipse , onto file. job give answer admin.java either returning value or counting rows , sending value admin.java. if number of rows 1 means username , password match , can allow user login.

but not able so. have tried using count(), count() cnt, tried int res=results.next. nothing seems help.

i pasting code below:

admin.java

semanticsearch semsearch = new semanticsearch(request.getsession()); semsearch.loaddata(realpath + rdfdatasourcefile1); semsearch.searchforuser(response.getoutputstream(),null, username, password);

in semanticsearch.java

public void searchforuser(outputstream out, string xslfile1, string username, string password) {     string prolog = "prefix kb:<"+vuser.geturi()+">";     system.out.println("search user in semantic search.java");      string querystring1 = prolog +"\n" +"select * " +"where {" +"?x kb:uname ?username. ?x kb:password ?password. ?x kb:interest ?interest. " +"filter regex(?username, \"" +username +"\")}";      system.out.println(querystring1);     query query=queryfactory.create(querystring1);     queryexecution qexec = queryexecutionfactory.create(query, model);     resultset results1 = qexec.execselect(); --> here 2 rows printed     int res=results1.getrownumber();     system.out.println(results1); -->here answer 0     resultsetformatter.out(results1);     resultsetformatter.out(out, results1);     system.out.println(res);     try {         if (xslfile1 != null)         {             out.write(resultsetformatter.asxmlstring(results1, xslfile1).getbytes("utf-8"));                 system.out.println(results1);                 system.out.println(xslfile1);             system.out.println("i in if");         }         else         {            out.write(resultsetformatter.asxmlstring(results1).getbytes(                         "utf-8"));            system.out.println("i in else");         }      } catch (ioexception e) {             e.printstacktrace();     } }

please help, struggling week, regards, archana.

in sparql 1.1, may supported in triplestore you're using, syntax is:

select (count(*) ?count) {   ... }

you should integer returned in ?count column, number of results.


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