I replied to your issue on github :) You need to pass a Literal not a string.
On 1 September 2017 at 20:18, <[email protected]> wrote: > Hello- > > I'm trying to follow the newbie examples on readthedocs and need to be able > to query with with a variable, but can't seem to figure out how. The examples > given in 4.2.2 do not work. > > Here I provide a simple failure case: > > ``` > Hopefully I'm really misunderstanding the examples here... > > Here is a sample test case: > > from rdflib import Graph, Literal, BNode, Namespace, RDF, URIRef > from rdflib.namespace import DC, FOAF > from rdflib.plugins.sparql import prepareQuery > > g = Graph() > > # Create an identifier to use as the subject for Donna. > donna = BNode() > > # Add triples using store's add method. > g.add( (donna, RDF.type, FOAF.Person) ) > g.add( (donna, FOAF.nick, Literal("donna", lang="foo")) ) > g.add( (donna, FOAF.name, Literal("Donna Fales")) ) > g.add( (donna, FOAF.mbox, URIRef("mailto:[email protected]";)) ) > > print(g.serialize(format='nt')) > > q = prepareQuery('SELECT ?hash WHERE { ?hash <http://xmlns.com/foaf/0.1/name> > "Donna Fales" .}') > person = "Donna Fales" > q2 = prepareQuery('SELECT ?hash WHERE { ?hash > <http://xmlns.com/foaf/0.1/name> ?person .}') > > # > # Example query works > # > qres = g.query(q) > if qres: > print("Found ?hash equal to:") > print(qres.result) > # > # Example initBindings does not work > # > qres2 = g.query(q2, initBindings={'person': person}) > if qres2: > print("Found ?hash equal to:") > print(qres2.result) > else: > print("{} not found in rdf - initBindings failed :(".format(person)) > ``` > > and the results: > ``` > _:N87622270e0574740bdea75e1bc609595 <http://xmlns.com/foaf/0.1/name> "Donna > Fales" . > _:N87622270e0574740bdea75e1bc609595 <http://xmlns.com/foaf/0.1/mbox> > <mailto:[email protected]> . > _:N87622270e0574740bdea75e1bc609595 <http://xmlns.com/foaf/0.1/nick> > "donna"@foo . > _:N87622270e0574740bdea75e1bc609595 > <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> > <http://xmlns.com/foaf/0.1/Person> . > > > Found ?hash equal to: > [(rdflib.term.BNode('N87622270e0574740bdea75e1bc609595'),)] > Donna Fales not found in rdf - initBindings failed :( > [Finished in 0.805s] > ``` > > > While the above code demonstrates searching with explicit terms 2,3, in a > triple (1, 2, 3) returns the expected corresponding triple, declaring x=3 and > searching 2,x fails to return anything. This seems like a trivial example - > what am I doing wrong? > > The corresponding example in the documentation code > (http://rdflib.readthedocs.io/en/stable/intro_to_sparql.html ) also fails, > and I dont know where else to turn :( > > Help! > > -- > http://github.com/RDFLib > --- > You received this message because you are subscribed to the Google Groups > "rdflib-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/rdflib-dev/966d1997-8ebb-4740-826d-fbc2f84ddfec%40googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- http://gromgull.net -- http://github.com/RDFLib --- You received this message because you are subscribed to the Google Groups "rdflib-dev" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/rdflib-dev/CAGm1ODmw4dc7ubjYpgH-Op3HbgfO7zvApmTkNYRnGptQCgvkhw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
