Running sparqlwrapper package using fuseki

[cvsrso...@gmail.com]

I'm trying to implement a sparqlwrapper class in python by using Flask and I'm getting a server error 500 while doing so. In the fuseki command line it's showing the 400 parse error.

Below is the code that I used to execute the query(I don't know whether it is correct or not but just tried to implement it).

Can anyone tell me whether this code is right or not and the corrections if possible.

from flask import Flask
from SPARQLWrapper import SPARQLWrapper, JSON
app = Flask(__name__)

@app.route('/')
def hello_world():
sparql = SPARQLWrapper("http://localhost:3030/BookMashup/sparql")
sparql.setQuery("""
PREFIX rdfs: <http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
SELECT ?label
WHERE { <http://dbpedia.org/resource/120_Days_of_Sodom> }
""")
sparql.setReturnFormat(JSON)
results = sparql.query().convert()

for result in results["results"]["bindings"]:
print(result["label"]["value"])

[Sergio Fernández]

That you're proxying in a Flask app the SPARQl query I think is not relevant for the issue.

Check the Fuseki documentation:  https://jena.apache.org/documentation/serving_data/#sparql-over-http 

Because I think you're pointing to the wrong endpoint. I think it should be something like /ds/query

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[Ram Somesh Chittella]

Can you tell me how the endpoint should be? 

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[Sergio Fernández]

I haven't use Fuseki for a while. But check the documentation I've linked in my previous email. I think it should be:

http://localhost:3030/ds/query

(so replacing 'ds' by your dataset name)

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[Osma Suominen]

Hello,

I think you have a syntax error in the query. The WHERE clause contains
only a single URI, not a triple pattern. I suggest you test the query
first in the Fuseki UI.

You probably need a WHERE clause like this:

WHERE {
<http://dbpedia.org/resource/120_Days_of_Sodom> rdfs:label ?label
}

-Osma

--
Osma Suominen
D.Sc. (Tech), Information Systems Specialist
National Library of Finland
P.O. Box 26 (Kaikukatu 4)
00014 HELSINGIN YLIOPISTO
Tel. +358 50 3199529
osma.s...@helsinki.fi
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