0

これは私のコードです

#!/usr/bin/python
# -*- coding: utf-8 -*-

import requests
from requests.auth import HTTPBasicAuth
from abc import ABCMeta, abstractmethod

class PPTSparqlClient:

    """Minimal Class to access PPT SparqlEndpoints"""

    def __init__(self, endpoint, user, passw):
        self.endpoint = endpoint;
        self.user = user;
        self.passw = passw;
        self.defaultHeaders = { "accept":"application/sparql-results+json" }
        self.defaultAuth = HTTPBasicAuth(self.user, self.passw)

    def execute(self, query, handler=None):
        r = requests.get(self.endpoint, auth=self.defaultAuth, headers=self.defaultHeaders, params={"query":query})
        if (r.status_code==404):
            raise Exception("404 : not found " + self.endpoint);        
        if (r.status_code==401):
            raise Exception("401 : unauthorized " + self.user + " " + self.passw)
        if(handler==None):
            return r.json();
        else:
            j = r.json();
            handler.startQueryResult(j["head"]["vars"]);
            for bindingSet in j["results"]["bindings"]:
                handler.handleSolution(bindingSet);
            handler.endQueryResult();

class TupleQueryResultHandler:

    """Base Class of SPARQL SELECT Query handlers"""

    @abstractmethod
    def startQueryResult(self,heads):
        pass;
    @abstractmethod
    def handleSolution(self,bindingSet):
        pass;
    @abstractmethod
    def endQueryResult(self):
        pass;        

class TerminalPrinter(TupleQueryResultHandler):

    """Class to handle application/sparql-results+json results by printing them to the terminal"""    

    def startQueryResult(self,heads):
        self.heads = heads;
        for head in heads:
            print "binding:"+head;
        print ""

    def handleSolution(self,bindingSet):
        for head in self.heads:
            print head+":"+bindingSet[head]["value"];
        print "";



def main(endpoint, user, passw, query):
    client = PPTSparqlClient(endpoint,user,passw);
    try:
        client.execute(query, TerminalPrinter());
    except Exception as ex:
        print ex.message


endpoint = "http://termmanagement.poolparty.biz/PoolParty/sparql/LawEnforcementSmall";
user = "username";
passw = "pass";

if  __name__ =='__main__':
    main(endpoint,user,passw,"SELECT * WHERE { ?s ?p ?o } LIMIT 10")

これは私が得る出力です:

binding:s
binding:p
binding:o

s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://www.w3.org/1999/02/22-rdf-syntax-ns#type
o:http://rdfs.org/ns/void#Dataset

s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://purl.org/dc/terms/creator
o:doanem

s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://purl.org/dc/terms/language
o:en

s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://www.semantic-web.at/ppcl/availablelanguages
o:en

s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://purl.org/dc/terms/date
o:2015-01-27T16:28:21Z

s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://purl.org/dc/terms/subject
o:video management

s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://purl.org/dc/terms/title
o:Law Enforcement

s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://rdfs.org/ns/void#sparqlEndpoint
o:http://termmanagement.poolparty.biz/PoolParty/sparql/LawEnforcement

s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://rdfs.org/ns/void#feature
o:node19dtn3sgfx1

s:node19dtn3sgfx1
p:http://www.w3.org/1999/02/22-rdf-syntax-ns#type
o:http://rdfs.org/ns/void#TechnicalFeature

さらに分析するためにファイルを JSON 形式に変換するにはどうすればよいですか? SPARQL から JSON に変換する組み込みメソッドがあることを読みました。どうやってやるの？

4

2 に答える 2

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適切な SPARQL リクエストを作成するためのすべての詳細を自分で実装しようとするのではなく、SPARQLWrapperを使用することを強くお勧めします。たとえば、SPARQL エンドポイントが「話さない」可能性がありますapplication/sparql-results+json。SPARQLWrapper はこれを正しく処理します。

于 2015-05-06T13:39:30.007 に答える