Thank you very much for your reply, I understand your response and successfully solve this problem!!! Thank you very much! I will study hard and continue to work hard. I hope I can grow up to be a capable person like you
在 2020-12-07 15:52:55，"Jean-Marc Vanel" <jeanmarc.va...@gmail.com> 写道： >As Lorenz said your pasting of Jena results is not very readable. >But I think I understand your problem, indeed a beginner's one . > >This query (1) brings no results: >PREFIX : <http://dsc.nlp-bigdatalab.org:8086/> >SELECT * WHERE { > :湿疹样 rdf:type ?o. > ?s ?p ?o. >} > >If we take each line of the above query, we have 2 queries that bring some >results: > >PREFIX : <http://dsc.nlp-bigdatalab.org:8086/> >SELECT * WHERE { > :湿疹样 rdf:type ?o. >} # query 2 >========== >PREFIX : <http://dsc.nlp-bigdatalab.org:8086/> >SELECT * WHERE { > ?s ?p ?o. >} LIMIT 5} # query 3 > >Then, why does query 1 bring no result ? >A query as like an equation with variables. >Query 1 is overconstrained, your dataset has no triples satisfying the 2 >lines. >Obviously ?o in >:湿疹样 rdf:type ?o. >is the resource of a class, so if you load your vocabulary (ontology) into >the database or query, >it will succeed. >So, you need in your database one triple like: >:西医症状 rdf:type <http://www.w3.org/2002/07/owl#Class> . >and then ?s in query 1 will match :西医症状 , ?p will match rdf:type , and ?o >will match <http://www.w3.org/2002/07/owl#Class> . > >Jean-Marc Vanel ><http://semantic-forms.cc:9112/display?displayuri=http://jmvanel.free.fr/jmv.rdf%23me> >+33 >(0)6 89 16 29 52 > > >Le lun. 7 déc. 2020 à 02:20, 周蓉 <onezhour...@163.com> a écrit : > >> Hello, I have a problem when I query in Fuseki in this way: >> ================================================================ >> >> PREFIX : <http://dsc.nlp-bigdatalab.org:8086/> >> >> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> >> >> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> >> >> SELECT * WHERE { >> >> ?s ?p ?o. >> >> } >> >> ================================================================ >> >> It can return the results like this: >> >> | 82 | >> :皮肤血管蜘蛛痣 >> | >> rdf:type >> | >> :西医症状 >> | >> | 83 | >> :血红蛋白E病 >> | >> rdfs:label >> | >> "血红蛋白E病"@ZH >> | >> | 84 | >> :复方枇杷氯化铵糖浆 >> | >> rdf:type >> | >> :药品 >> | >> | >> | | | >> | >> | 86 | >> :快节奏综合症 >> | >> rdf:type >> | >> :疾病 >> | >> | 87 | >> :作腐提脓膏 >> | >> rdfs:label >> | >> "作腐提脓膏"@ZH >> | >> but when I just try to add a constraint to expect the result like line85 >> above，： >> | 85 | >> :湿疹样 >> | >> rdf:type >> | >> :西医症状 >> | >> I modify the query ： >> ================================================================ >> PREFIX : <http://dsc.nlp-bigdatalab.org:8086/> >> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> >> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> >> SELECT * WHERE { >> :湿疹样 rdf:type ?o. >> ?s ?p ?o. >> } >> ================================================================ >> and then it does not work!!!!!!!!!!!!!!!!!!!!!!!!! >> the result shows "No data available in the table" >> I do write query statements based on existing data >> so it has confused me for several days >> I need your help，thanks! >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >>
