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Federated query with drugs and Wikidata
Sample federated query with drugs and Wikidata : the most expensive drugs in the dataset.

Reuse these data in your code

Query, endpoint and code for reusing the same data
http://linkeddata.finki.ukim.mk/sparql
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> 
PREFIX wdt: <http://www.wikidata.org/prop/direct/> 
PREFIX drugbank: <http://www4.wiwiss.fu-berlin.de/drugbank/resource/drugbank/> 
PREFIX schema: <http://schema.org/> 

select distinct
?label ?costPerUnit
(replace(xsd:string(?link), 
         "http://www.wikidata.org/entity/", 
         "https://www.wikidata.org/wiki/Special:GoToLinkedPage/enwiki/") as ?link)
where 
  { 
    graph <http://linkeddata.finki.ukim.mk/lod/data/drugs-v2.1#> 
        {
          SELECT ?atcCode ?costPerUnit
      		WHERE
             {
                 ?drugID schema:cost ?cost ;
              		drugbank:atcCode ?atcCode .
     		     ?cost schema:costPerUnit ?costPerUnit .
             }
          ORDER BY DESC(?costPerUnit)
          LIMIT 10
    	}
    SERVICE <https://query.wikidata.org/sparql> 
      { 
      		?link wdt:P267 ?atcCode ;
                  rdfs:label ?label .
              FILTER ( lang(?label) = "en" )
      }
  }
Howto write a query SPARQL? (in french)
{{#sparql:PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> 
PREFIX wdt: <http://www.wikidata.org/prop/direct/> 
PREFIX drugbank: <http://www4.wiwiss.fu-berlin.de/drugbank/resource/drugbank/> 
PREFIX schema: <http://schema.org/> 

select distinct
?label ?costPerUnit
(replace(xsd:string(?link), 
         "http://www.wikidata.org/entity/", 
         "https://www.wikidata.org/wiki/Special:GoToLinkedPage/enwiki/") as ?link)
where 
  { 
    graph <http://linkeddata.finki.ukim.mk/lod/data/drugs-v2.1#> 
        {
          SELECT ?atcCode ?costPerUnit
      		WHERE
             {
                 ?drugID schema:cost ?cost ;
              		drugbank:atcCode ?atcCode .
     		     ?cost schema:costPerUnit ?costPerUnit .
             }
          ORDER BY DESC(?costPerUnit)
          LIMIT 10
    	}
    SERVICE <https://query.wikidata.org/sparql> 
      { 
      		?link wdt:P267 ?atcCode ;
                  rdfs:label ?label .
              FILTER ( lang(?label) = "en" )
      }
  }            
| endpoint = http://linkeddata.finki.ukim.mk/sparql }}
Howto insert this graph in my wiki ?
Test this script in a new tab.
<html>
    <head>
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
    </head>
    <body onload="testQuery();">
        <script>
function testQuery(){
    var endpoint = "http://linkeddata.finki.ukim.mk/sparql";
    var query = "PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>\n\
PREFIX wdt: <http://www.wikidata.org/prop/direct/>\n\
PREFIX drugbank: <http://www4.wiwiss.fu-berlin.de/drugbank/resource/drugbank/>\n\
PREFIX schema: <http://schema.org/>\n\
select distinct\n\
?label ?costPerUnit\n\
(replace(xsd:string(?link),\n\
\"http://www.wikidata.org/entity/\",\n\
\"https://www.wikidata.org/wiki/Special:GoToLinkedPage/enwiki/\") as ?link)\n\
where\n\
{\n\
graph <http://linkeddata.finki.ukim.mk/lod/data/drugs-v2.1#>\n\
{\n\
SELECT ?atcCode ?costPerUnit\n\
WHERE\n\
{\n\
?drugID schema:cost ?cost ;\n\
drugbank:atcCode ?atcCode .\n\
?cost schema:costPerUnit ?costPerUnit .\n\
}\n\
ORDER BY DESC(?costPerUnit)\n\
LIMIT 10\n\
}\n\
SERVICE <https://query.wikidata.org/sparql>\n\
{\n\
?link wdt:P267 ?atcCode ;\n\
rdfs:label ?label .\n\
FILTER ( lang(?label) = \"en\" )\n\
}\n\
}"

   // $('#bodyContentResearch').append(queryDataset);
    $.ajax({
                url: endpoint,
                dataType: 'json', 
                data: { 
                    queryLn: 'SPARQL',
                    query: query , 
                    limit: 'none',
                    infer: 'true',
                    Accept: 'application/sparql-results+json'
                },
                success: displayResult, 
                error: displayError
        });
}

function displayError(xhr, textStatus, errorThrown) {
    console.log(textStatus);
    console.log(errorThrown);
}

function displayResult(data) {
    $.each(data.results.bindings, function(index, bs) {
        console.log(bs);
        $("body").append(JSON.stringify(bs) + "<hr/>");
    });
}

        </script>
    </body>    
</html>
</pre>
  
Test this script in a new tab.
Howto insert this graph in my html page?
<html>
    <head>
        <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
        <script type="text/javascript" src="https://www.google.com/jsapi"></script>
        <script type="text/javascript" src="js/sgvizler/sgvizler.js"></script>
    </head>
<body style="margin:0;">
<div id="sgvzl_example_query" 
   data-sgvizler-endpoint="http://linkeddata.finki.ukim.mk/sparql" 
   data-sgvizler-query="PREFIX rdfs: &lt;http://www.w3.org/2000/01/rdf-schema#&gt; 
PREFIX wdt: &lt;http://www.wikidata.org/prop/direct/&gt; 
PREFIX drugbank: &lt;http://www4.wiwiss.fu-berlin.de/drugbank/resource/drugbank/&gt; 
PREFIX schema: &lt;http://schema.org/&gt; 

select distinct
?label ?costPerUnit
(replace(xsd:string(?link), 
         &quot;http://www.wikidata.org/entity/&quot;, 
         &quot;https://www.wikidata.org/wiki/Special:GoToLinkedPage/enwiki/&quot;) as ?link)
where 
  { 
    graph &lt;http://linkeddata.finki.ukim.mk/lod/data/drugs-v2.1#&gt; 
        {
          SELECT ?atcCode ?costPerUnit
      		WHERE
             {
                 ?drugID schema:cost ?cost ;
              		drugbank:atcCode ?atcCode .
     		     ?cost schema:costPerUnit ?costPerUnit .
             }
          ORDER BY DESC(?costPerUnit)
          LIMIT 10
    	}
    SERVICE &lt;https://query.wikidata.org/sparql&gt; 
      { 
      		?link wdt:P267 ?atcCode ;
                  rdfs:label ?label .
              FILTER ( lang(?label) = &quot;en&quot; )
      }
  }" 
    data-sgvizler-chart='google.visualization.Table'             
    data-sgvizler-chart-options=''  
    data-sgvizler-endpoint_output_format='json'
    data-sgvizler-loglevel='2'   
    style='width:100%; height:450px;'  />



<script>
$(document).ready(function() { 
    sgvizler.containerDrawAll();   
    
});
</script>

</body>
</html>
from SPARQLWrapper import SPARQLWrapper, JSON

sparql = SPARQLWrapper("http://linkeddata.finki.ukim.mk/sparql")
sparql.setQuery("""
    PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> 
PREFIX wdt: <http://www.wikidata.org/prop/direct/> 
PREFIX drugbank: <http://www4.wiwiss.fu-berlin.de/drugbank/resource/drugbank/> 
PREFIX schema: <http://schema.org/> 

select distinct
?label ?costPerUnit
(replace(xsd:string(?link), 
         "http://www.wikidata.org/entity/", 
         "https://www.wikidata.org/wiki/Special:GoToLinkedPage/enwiki/") as ?link)
where 
  { 
    graph <http://linkeddata.finki.ukim.mk/lod/data/drugs-v2.1#> 
        {
          SELECT ?atcCode ?costPerUnit
      		WHERE
             {
                 ?drugID schema:cost ?cost ;
              		drugbank:atcCode ?atcCode .
     		     ?cost schema:costPerUnit ?costPerUnit .
             }
          ORDER BY DESC(?costPerUnit)
          LIMIT 10
    	}
    SERVICE <https://query.wikidata.org/sparql> 
      { 
      		?link wdt:P267 ?atcCode ;
                  rdfs:label ?label .
              FILTER ( lang(?label) = "en" )
      }
  }""")
sparql.setReturnFormat(JSON)
results = sparql.query().convert()

for result in results["results"]["bindings"]:
    print(result)
    #print(result["label"]["value"])
Howto use SPARQL with Python ?
library(SPARQL) # SPARQL querying package
library(ggplot2)
 
# Step 1 - Set up preliminaries and define query
# Define the data.gov endpoint
endpoint <- "http://linkeddata.finki.ukim.mk/sparql"
# create query statement
query <- "PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> 
PREFIX wdt: <http://www.wikidata.org/prop/direct/> 
PREFIX drugbank: <http://www4.wiwiss.fu-berlin.de/drugbank/resource/drugbank/> 
PREFIX schema: <http://schema.org/> 

select distinct
?label ?costPerUnit
(replace(xsd:string(?link), 
         "http://www.wikidata.org/entity/", 
         "https://www.wikidata.org/wiki/Special:GoToLinkedPage/enwiki/") as ?link)
where 
  { 
    graph <http://linkeddata.finki.ukim.mk/lod/data/drugs-v2.1#> 
        {
          SELECT ?atcCode ?costPerUnit
      		WHERE
             {
                 ?drugID schema:cost ?cost ;
              		drugbank:atcCode ?atcCode .
     		     ?cost schema:costPerUnit ?costPerUnit .
             }
          ORDER BY DESC(?costPerUnit)
          LIMIT 10
    	}
    SERVICE <https://query.wikidata.org/sparql> 
      { 
      		?link wdt:P267 ?atcCode ;
                  rdfs:label ?label .
              FILTER ( lang(?label) = "en" )
      }
  }" 
# Step 2 - Use SPARQL package to submit query and save results to a data frame
qd <- SPARQL(endpoint,query)
df <- qd$results
SPARQL with R in less than 5 minutes
#!/usr/bin/env ruby
#
# Install sparql for Ruby
#   gem update --system
#   gem install sparql
#
require 'sparql/client'

endpoint = "http://linkeddata.finki.ukim.mk/sparql"
sparql = <<-EOT
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> 
PREFIX wdt: <http://www.wikidata.org/prop/direct/> 
PREFIX drugbank: <http://www4.wiwiss.fu-berlin.de/drugbank/resource/drugbank/> 
PREFIX schema: <http://schema.org/> 

select distinct
?label ?costPerUnit
(replace(xsd:string(?link), 
         "http://www.wikidata.org/entity/", 
         "https://www.wikidata.org/wiki/Special:GoToLinkedPage/enwiki/") as ?link)
where 
  { 
    graph <http://linkeddata.finki.ukim.mk/lod/data/drugs-v2.1#> 
        {
          SELECT ?atcCode ?costPerUnit
      		WHERE
             {
                 ?drugID schema:cost ?cost ;
              		drugbank:atcCode ?atcCode .
     		     ?cost schema:costPerUnit ?costPerUnit .
             }
          ORDER BY DESC(?costPerUnit)
          LIMIT 10
    	}
    SERVICE <https://query.wikidata.org/sparql> 
      { 
      		?link wdt:P267 ?atcCode ;
                  rdfs:label ?label .
              FILTER ( lang(?label) = "en" )
      }
  }
EOT

#For Wikidata, the method get is required
#For other SPARQL endpoints, the method post is prefered
client = SPARQL::Client.new(endpoint, :method => :get)
rows = client.query(sparql)

puts "Number of rows: #{rows.size}"
for row in rows
  for key,val in row do
    # print "#{key.to_s.ljust(10)}: #{val}\t"
    print "#{key}: #{val}\t"
  end
  print "\n"
end
Doc Ruby for SPARQL 1.1
endpoint = 'http://linkeddata.finki.ukim.mk/sparql';

query = ['PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>  '...
'PREFIX wdt: <http://www.wikidata.org/prop/direct/>  '...
'PREFIX drugbank: <http://www4.wiwiss.fu-berlin.de/drugbank/resource/drugbank/>  '...
'PREFIX schema: <http://schema.org/>  '...
' '...
'select distinct '...
'?label ?costPerUnit '...
'(replace(xsd:string(?link),  '...
'         "http://www.wikidata.org/entity/",  '...
'         "https://www.wikidata.org/wiki/Special:GoToLinkedPage/enwiki/") as ?link) '...
'where  '...
'  {  '...
'    graph <http://linkeddata.finki.ukim.mk/lod/data/drugs-v2.1#>  '...
'        { '...
'          SELECT ?atcCode ?costPerUnit '...
'      		WHERE '...
'             { '...
'                 ?drugID schema:cost ?cost ; '...
'              		drugbank:atcCode ?atcCode . '...
'     		     ?cost schema:costPerUnit ?costPerUnit . '...
'             } '...
'          ORDER BY DESC(?costPerUnit) '...
'          LIMIT 10 '...
'    	} '...
'    SERVICE <https://query.wikidata.org/sparql>  '...
'      {  '...
'      		?link wdt:P267 ?atcCode ; '...
'                  rdfs:label ?label . '...
'              FILTER ( lang(?label) = "en" ) '...
'      } '...
'  } '];

url_head = strcat(endpoint,'?query=');
url_query = urlencode(query);
format = 'text/tab-separated-values';
url_tail = strcat('&format=', format);

url = strcat(url_head, url_query, url_tail);

% get the data from the endpoint
query_results = urlread(url);

% write the data to a file so that tdfread can parse it
fid = fopen('query_results.txt','w');
if fid>=0
    fprintf(fid, '%s\n', query_results)
    fclose(fid)
end

% this reads the tsv file into a struct
sparql_data = tdfread('query_results.txt')
Project Github MatlabSPARQL
<?php 
require_once('lib/SPARQL/Endpoint.php');

$endpoint ="http://linkeddata.finki.ukim.mk/sparql";
$sp_readonly = new Endpoint($endpoint);
$q = <<<EOD
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> 
PREFIX wdt: <http://www.wikidata.org/prop/direct/> 
PREFIX drugbank: <http://www4.wiwiss.fu-berlin.de/drugbank/resource/drugbank/> 
PREFIX schema: <http://schema.org/> 

select distinct
?label ?costPerUnit
(replace(xsd:string(?link), 
         "http://www.wikidata.org/entity/", 
         "https://www.wikidata.org/wiki/Special:GoToLinkedPage/enwiki/") as ?link)
where 
  { 
    graph <http://linkeddata.finki.ukim.mk/lod/data/drugs-v2.1#> 
        {
          SELECT ?atcCode ?costPerUnit
      		WHERE
             {
                 ?drugID schema:cost ?cost ;
              		drugbank:atcCode ?atcCode .
     		     ?cost schema:costPerUnit ?costPerUnit .
             }
          ORDER BY DESC(?costPerUnit)
          LIMIT 10
    	}
    SERVICE <https://query.wikidata.org/sparql> 
      { 
      		?link wdt:P267 ?atcCode ;
                  rdfs:label ?label .
              FILTER ( lang(?label) = "en" )
      }
  }EOD;
$rows = $sp_readonly->query($q, 'rows');
$err = $sp_readonly->getErrors();
if ($err) {
      print_r($err);
      throw new Exception(print_r($err,true));
}

foreach($rows["result"]["variables"] as $variable){
        printf("%-20.20s",$variable);
        echo '|';
 }
 echo "\n";

foreach ($rows["result"]["rows"] as $row){
        foreach($rows["result"]["variables"] as $variable){
                printf("%-20.20s",$row[$variable]);
        echo '|';
        }
        echo "\n";
 }
 ?>
Project Github BorderCloud/SPARQL
import com.bordercloud.sparql.Endpoint;
import java.util.ArrayList;
import java.util.HashMap;

public class Main {

    public static void main(String[] args) {
        try {
            Endpoint sp = new Endpoint("http://linkeddata.finki.ukim.mk/sparql";, false);

            String querySelect = 'PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>  \n'
                    + 'PREFIX wdt: <http://www.wikidata.org/prop/direct/>  \n'
                    + 'PREFIX drugbank: <http://www4.wiwiss.fu-berlin.de/drugbank/resource/drugbank/>  \n'
                    + 'PREFIX schema: <http://schema.org/>  \n'
                    + ' \n'
                    + 'select distinct \n'
                    + '?label ?costPerUnit \n'
                    + '(replace(xsd:string(?link),  \n'
                    + '         "http://www.wikidata.org/entity/",  \n'
                    + '         "https://www.wikidata.org/wiki/Special:GoToLinkedPage/enwiki/") as ?link) \n'
                    + 'where  \n'
                    + '  {  \n'
                    + '    graph <http://linkeddata.finki.ukim.mk/lod/data/drugs-v2.1#>  \n'
                    + '        { \n'
                    + '          SELECT ?atcCode ?costPerUnit \n'
                    + '      		WHERE \n'
                    + '             { \n'
                    + '                 ?drugID schema:cost ?cost ; \n'
                    + '              		drugbank:atcCode ?atcCode . \n'
                    + '     		     ?cost schema:costPerUnit ?costPerUnit . \n'
                    + '             } \n'
                    + '          ORDER BY DESC(?costPerUnit) \n'
                    + '          LIMIT 10 \n'
                    + '    	} \n'
                    + '    SERVICE <https://query.wikidata.org/sparql>  \n'
                    + '      {  \n'
                    + '      		?link wdt:P267 ?atcCode ; \n'
                    + '                  rdfs:label ?label . \n'
                    + '              FILTER ( lang(?label) = "en" ) \n'
                    + '      } \n'
                    + '  } \n';

            HashMap rs = sp.query(querySelect);
            printResult(rs,30);

        }catch(EndpointException eex) {
            System.out.println(eex);
            eex.printStackTrace();
        }
    }

    public static void printResult(HashMap rs , int size) {

      for (String variable : (ArrayList) rs.get("result").get("variables")) {
        System.out.print(String.format("%-"+size+"."+size+"s", variable ) + " | ");
      }
      System.out.print("\n");
      for (HashMap value : (ArrayList>) rs.get("result").get("rows")) {
        //System.out.print(value);
        /* for (String key : value.keySet()) {
         System.out.println(value.get(key));
         }*/
        for (String variable : (ArrayList) rs.get("result").get("variables")) {
          //System.out.println(value.get(variable));
          System.out.print(String.format("%-"+size+"."+size+"s", value.get(variable)) + " | ");
        }
        System.out.print("\n");
      }
    }
}
Project Github BorderCloud/SPARQL-JAVA