{"id":14851,"date":"2022-10-09T09:42:51","date_gmt":"2022-10-09T04:12:51","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-to-write-a-query-sparql-in-java-code-using-strstarts-filter\/"},"modified":"2022-10-09T09:42:51","modified_gmt":"2022-10-09T04:12:51","slug":"solved-to-write-a-query-sparql-in-java-code-using-strstarts-filter","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-to-write-a-query-sparql-in-java-code-using-strstarts-filter\/","title":{"rendered":"[Solved] To write a query SPARQL in Java code using strstarts filter"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-24576980\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"24576980\" data-parentid=\"24576599\" data-score=\"-2\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>I have resolved my problem using this code:<\/p>\n<pre><code>public QueryExecution query(){\n\n        String stringa = \"http:\/\/dbpedia.org\/resource\/Fred_Guy\";\n\n        ParameterizedSparqlString qs = new ParameterizedSparqlString( \"\" +\n                \"prefix dbpediaont: &lt;http:\/\/dbpedia.org\/ontology\/&gt;\\n\" +\n                \"prefix dbpedia: &lt;http:\/\/dbpedia.org\/resource\/&gt;\\n\" +\n                \"prefix rdf: &lt;http:\/\/www.w3.org\/1999\/02\/22-rdf-syntax-ns#&gt;\\n\" +\n                \"\\n\" +  \n                \"select ?resource where {\\n\" +\n                \"?mat rdf:type ?resource\\n\" +\n                \"filter strstarts(str(?resource), dbpediaont:)\\n\" +\n                \"}\" );\n\n\n        Resource risorsa = ResourceFactory.createResource(stringa);\n        qs.setParam( \"mat\", risorsa );\n\n        \/\/System.out.println( qs );\n\n        QueryExecution exec = QueryExecutionFactory.sparqlService( \"http:\/\/dbpedia.org\/sparql\", qs.asQuery() );\n\n\n        ResultSet results = ResultSetFactory.copyResults( exec.execSelect() );\n\n        while ( results.hasNext() ) {\n\n            System.out.println( results.next().get( \"resource\" ));\n        }\n\n        \/\/ A simpler way of printing the results.\n        ResultSetFormatter.out( results );\n\n        return exec;\n\n    }\n<\/code><\/pre>\n<p>In particular, in FILTER as the second arguments, I have written the &#8220;dbpediaont&#8221; label.<\/p>\n<p>This code, however, still produces an error:<\/p>\n<pre><code>Exception in thread \"main\" HttpException: 500\n    at com.hp.hpl.jena.sparql.engine.http.HttpQuery.execGet(HttpQuery.java:340)\n    at com.hp.hpl.jena.sparql.engine.http.HttpQuery.exec(HttpQuery.java:276)\n    at com.hp.hpl.jena.sparql.engine.http.QueryEngineHTTP.execSelect(QueryEngineHTTP.java:345)\n<\/code><\/pre>\n<p>This error is due to the fact that the code need to write <\/p>\n<blockquote>\n<p>dbpediaont:<\/p>\n<\/blockquote>\n<p>with <\/p>\n<blockquote>\n<p>str()<\/p>\n<\/blockquote>\n<p>since it&#8217;s an IRI, not a string:<\/p>\n<pre><code>filter strstarts(str(?resource), str(dbpediaont:))\n<\/code><\/pre>\n<p>The latter problem is reported on HttpException error when I call SPARQL query (on DBPedia) in Java Code<\/p>\n<p>I hope this answer can help someone.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">6<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved To write a query SPARQL in Java code using strstarts filter <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] I have resolved my problem using this code: public QueryExecution query(){ String stringa = &#8220;http:\/\/dbpedia.org\/resource\/Fred_Guy&#8221;; ParameterizedSparqlString qs = new ParameterizedSparqlString( &#8220;&#8221; + &#8220;prefix dbpediaont: &lt;http:\/\/dbpedia.org\/ontology\/&gt;\\n&#8221; + &#8220;prefix dbpedia: &lt;http:\/\/dbpedia.org\/resource\/&gt;\\n&#8221; + &#8220;prefix rdf: &lt;http:\/\/www.w3.org\/1999\/02\/22-rdf-syntax-ns#&gt;\\n&#8221; + &#8220;\\n&#8221; + &#8220;select ?resource where {\\n&#8221; + &#8220;?mat rdf:type ?resource\\n&#8221; + &#8220;filter strstarts(str(?resource), dbpediaont:)\\n&#8221; + &#8220;}&#8221; ); Resource risorsa = &#8230; <a title=\"[Solved] To write a query SPARQL in Java code using strstarts filter\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-to-write-a-query-sparql-in-java-code-using-strstarts-filter\/\" aria-label=\"More on [Solved] To write a query SPARQL in Java code using strstarts filter\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[3868,323,3867,3853,3866],"class_list":["post-14851","post","type-post","status-publish","format-standard","hentry","category-solved","tag-dbpedia","tag-java","tag-jena","tag-semantic-web","tag-sparql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] To write a query SPARQL in Java code using strstarts filter - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-to-write-a-query-sparql-in-java-code-using-strstarts-filter\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] To write a query SPARQL in Java code using strstarts filter - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] I have resolved my problem using this code: public QueryExecution query(){ String stringa = &quot;http:\/\/dbpedia.org\/resource\/Fred_Guy&quot;; ParameterizedSparqlString qs = new ParameterizedSparqlString( &quot;&quot; + &quot;prefix dbpediaont: &lt;http:\/\/dbpedia.org\/ontology\/&gt;n&quot; + &quot;prefix dbpedia: &lt;http:\/\/dbpedia.org\/resource\/&gt;n&quot; + &quot;prefix rdf: &lt;http:\/\/www.w3.org\/1999\/02\/22-rdf-syntax-ns#&gt;n&quot; + &quot;n&quot; + &quot;select ?resource where {n&quot; + &quot;?mat rdf:type ?resourcen&quot; + &quot;filter strstarts(str(?resource), dbpediaont:)n&quot; + &quot;}&quot; ); Resource risorsa = ... 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