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from rdflib import Graph, URIRef, Literal
from six.moves.urllib.request import urlopen
import os
import unittest
from nose import SkipTest
from requests import HTTPError
try:
assert len(urlopen("http://dbpedia.org/sparql").read()) > 0
except:
raise SkipTest("No HTTP connection.")
class SPARQLStoreDBPediaTestCase(unittest.TestCase):
store_name = 'SPARQLStore'
path = "http://dbpedia.org/sparql"
storetest = True
create = False
def setUp(self):
self.graph = Graph(store="SPARQLStore")
self.graph.open(self.path, create=self.create)
ns = list(self.graph.namespaces())
assert len(ns) > 0, ns
def tearDown(self):
self.graph.close()
def test_Query(self):
query = "select distinct ?Concept where {[] a ?Concept} LIMIT 1"
res = self.graph.query(query, initNs={})
for i in res:
assert type(i[0]) == URIRef, i[0].n3()
def test_initNs(self):
query = """\
SELECT ?label WHERE
{ ?s a xyzzy:Concept ; xyzzy:prefLabel ?label . } LIMIT 10
"""
res = self.graph.query(
query,
initNs={"xyzzy": "http://www.w3.org/2004/02/skos/core#"})
for i in res:
assert type(i[0]) == Literal, i[0].n3()
def test_noinitNs(self):
query = """\
SELECT ?label WHERE
{ ?s a xyzzy:Concept ; xyzzy:prefLabel ?label . } LIMIT 10
"""
self.assertRaises(
HTTPError,
self.graph.query,
query)
def test_query_with_added_prolog(self):
prologue = """\
PREFIX xyzzy: <http://www.w3.org/2004/02/skos/core#>
"""
query = """\
SELECT ?label WHERE
{ ?s a xyzzy:Concept ; xyzzy:prefLabel ?label . } LIMIT 10
"""
res = self.graph.query(prologue + query)
for i in res:
assert type(i[0]) == Literal, i[0].n3()
if __name__ == '__main__':
unittest.main()
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