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from rdflib import Graph, URIRef, Literal
from rdflib.plugins.sparql import prepareQuery
from rdflib.compare import isomorphic
from nose.tools import eq_
def test_graph_prefix():
"""
This is issue https://github.com/RDFLib/rdflib/issues/313
"""
g1 = Graph()
g1.parse(data="""
@prefix : <urn:ns1:> .
:foo <p> 42.
""", format="n3")
g2 = Graph()
g2.parse(data="""
@prefix : <urn:somethingelse:> .
<urn:ns1:foo> <p> 42.
""", format="n3")
assert isomorphic(g1, g2)
q_str = ("""
PREFIX : <urn:ns1:>
SELECT ?val
WHERE { :foo ?p ?val }
""")
q_prepared = prepareQuery(q_str)
expected = [(Literal(42),)]
eq_(list(g1.query(q_prepared)), expected)
eq_(list(g2.query(q_prepared)), expected)
eq_(list(g1.query(q_str)), expected)
eq_(list(g2.query(q_str)), expected)
def test_variable_order():
g = Graph()
g.add((URIRef("http://foo"),URIRef("http://bar"),URIRef("http://baz")))
res = g.query("SELECT (42 AS ?a) ?b { ?b ?c ?d }")
row = list(res)[0]
print(row)
assert len(row) == 2
assert row[0] == Literal(42)
assert row[1] == URIRef("http://foo")
def test_sparql_bnodelist():
"""
syntax tests for a few corner-cases not touched by the
official tests.
"""
prepareQuery('select * where { ?s ?p ( [] ) . }')
prepareQuery('select * where { ?s ?p ( [ ?p2 ?o2 ] ) . }')
prepareQuery('select * where { ?s ?p ( [ ?p2 ?o2 ] [] ) . }')
prepareQuery('select * where { ?s ?p ( [] [ ?p2 ?o2 ] [] ) . }')
def test_complex_sparql_construct():
g = Graph()
q = '''select ?subject ?study ?id where {
?s a <urn:Person>;
<urn:partOf> ?c;
<urn:hasParent> ?mother, ?father;
<urn:id> [ a <urn:Identifier>; <urn:has-value> ?id].
}'''
g.query(q)
if __name__ == '__main__':
import nose
nose.main(defaultTest=__name__)
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