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"""
Simple examples showing how to use the SPARQLStore
"""
from rdflib import Graph, Namespace, URIRef
from rdflib.plugins.stores.sparqlstore import SPARQLStore
from rdflib.term import Identifier
if __name__ == "__main__":
dbo = Namespace("http://dbpedia.org/ontology/")
# EXAMPLE 1: using a Graph with the Store type string set to "SPARQLStore"
graph = Graph("SPARQLStore", identifier="http://dbpedia.org")
graph.open("http://dbpedia.org/sparql")
pop = graph.value(URIRef("http://dbpedia.org/resource/Berlin"), dbo.populationTotal)
assert isinstance(pop, Identifier)
print(
"According to DBPedia, Berlin has a population of {0:,}".format(
int(pop)
).replace(",", ".")
)
print()
# EXAMPLE 2: using a SPARQLStore object directly
st = SPARQLStore(query_endpoint="http://dbpedia.org/sparql")
for p in st.objects(
URIRef("http://dbpedia.org/resource/Brisbane"), dbo.populationTotal
):
assert isinstance(p, Identifier)
print(
"According to DBPedia, Brisbane has a population of " "{0}".format(int(p))
)
print()
# EXAMPLE 3: doing RDFlib triple navigation using SPARQLStore as a Graph()
print("Triple navigation using SPARQLStore as a Graph():")
graph = Graph("SPARQLStore", identifier="http://dbpedia.org")
graph.open("http://dbpedia.org/sparql")
# we are asking DBPedia for 3 skos:Concept instances
count = 0
from rdflib.namespace import RDF, SKOS
for s in graph.subjects(predicate=RDF.type, object=SKOS.Concept):
count += 1
print(f"\t- {s}")
if count >= 3:
break
# EXAMPLE 4: using a SPARQL endpoint that requires Basic HTTP authentication
# NOTE: this example won't run since the endpoint isn't live (or real)
sparql_store = SPARQLStore(
query_endpoint="http://fake-sparql-endpoint.com/repository/x",
auth=("my_username", "my_password"),
)
# do normal Graph things
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