Groovy SPARQL Example

ExampleGroovySparql.groovy

@Grab('com.hp.hpl.jena:jena:2.6.4')
@Grab('com.hp.hpl.jena:arq:2.8.8')

import groovy.sparql.Sparql

// Can also take a Jena model as an argument
def sparql = new Sparql("http://dbpedia.org/sparql")

def query = """
    SELECT ?abstract
	WHERE {    
		SERVICE <http://dbpedia.org/sparql> {
			<http://dbpedia.org/resource/Groovy_%28programming_language%29> 
			<http://dbpedia.org/ontology/abstract> 
			?abstract 
		}
	} LIMIT 5
"""

sparql.eachRow query { row ->
  println row.abstract
}


/**
 * Also accept a map of binding parameters
 * Entries of URI type can be used in Subject/Predicate slots in the triple
 * Types of String are turned into Literals, so if you want literal URIs, use Strings
 */

def predicate = new URI("http://dbpedia.org/ontology/abstract")
		
sparql.eachRow( query, [ uri:new URI("http://dbpedia.org/resource/Groovy_%28programming_language%29"), predicate:predicate], { row ->
      println row.abstract
})


/**
 * Also the map can accept an object, and find subject/predicate/object fields
 */

class GroovyWiki {

	def subject = new URI("http://dbpedia.org/resource/Groovy_%28programming_language%29")
	def predicate = new URI("http://dbpedia.org/ontology/abstract")
}

def obj = new GroovyWiki()
def map = [groovy:obj]

// note the form of the variables in the query is:
// mapEntry name plus Subject, Predicate, or Object(not shown)
query = """
SELECT ?abstract
	WHERE {    
		SERVICE <http://dbpedia.org/sparql> {
			?groovySubject ?groovyPredicate ?abstract
		}
	} LIMIT 5
"""

sparql = new Sparql("http://dbpedia.org/sparql")
sparql.eachRow( query, map, { row ->
	println row.abstract
})