blob: 035c6137d097256dc9c0a91550f2e89845a21c4c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
"""
SPARQL Queries be prepared (i.e parsed and translated to SPARQL algebra)
by the :meth:`rdflib.plugins.sparql.prepareQuery` method.
``initNs`` can be used instead of PREFIX values.
When executing, variables can be bound with the
``initBindings`` keyword parameter.
"""
from pathlib import Path
import rdflib
from rdflib.namespace import FOAF
from rdflib.plugins.sparql import prepareQuery
EXAMPLES_DIR = Path(__file__).parent
if __name__ == "__main__":
q = prepareQuery(
"SELECT ?name WHERE { ?person foaf:knows/foaf:name ?name . }",
initNs={"foaf": FOAF},
)
g = rdflib.Graph()
g.parse(f"{EXAMPLES_DIR / 'foaf.n3'}")
tim = rdflib.URIRef("http://www.w3.org/People/Berners-Lee/card#i")
for row in g.query(q, initBindings={"person": tim}):
# For select queries, the Result object is an iterable of ResultRow
# objects.
assert isinstance(row, rdflib.query.ResultRow)
print(row.name)
|
