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[question] Update appears to succeed, but no data on select #252

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retog opened this issue Oct 28, 2019 · 4 comments
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[question] Update appears to succeed, but no data on select #252

retog opened this issue Oct 28, 2019 · 4 comments

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@retog
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retog commented Oct 28, 2019

Hi,

I just wanted to give QuitStore a try and started it using just defaults with docker run -it -p 8080:8080 aksw/quitstore.

Sending an update statements yields to a rassuring response code:

$ curl -D - 'http://localhost:8080/sparql' -H 'Accept: text/plain,*/*;q=0.9' -H 'Content-Type: application/x-www-form-urlencoded; charset=UTF-8' --data 'update=PREFIX+dc%3A+%3Chttp%3A%2F%2Fpurl.org%2Fdc%2Felements%2F1.1%2F%3E%0AINSERT+DATA%0A%7B+%0A++%3Chttp%3A%2F%2Fexample%2Fbook1%3E+dc%3Atitle+%22A+new+book%22+%3B%0A+++++++++++++++++++++++++dc%3Acreator+%22A.N.Other%22+.%0A%7D'
HTTP/1.1 200 OK
Content-Type: text/html; charset=utf-8
Content-Length: 0
X-CurrentBranch: master
X-CurrentCommit: e6199a32292a5837c73d00feef33041d8899bc13
Access-Control-Allow-Origin: *

However no data appears in the git repository in /data in the container and no data is returned by a select query:

$ curl 'http://localhost:8080/sparql' --data 'query=SELECT+*+WHERE+%7B%0A++%3Fsub+%3Fpred+%3Fobj+.%0A+%7D%0A%0ALIMIT+10'
<?xml version="1.0" encoding="utf-8"?>
<sparql xmlns="http://www.w3.org/2005/sparql-results#" xmlns:xml="http://www.w3.org/XML/1998/namespace"><head><variable name="obj"></variable><variable name="pred"></variable><variable name="sub"></variable></head><results></results></sparql>

I'm probably missing something obvious, but I would be extremly grateful if you could point me to it.
@white-gecko white-gecko changed the title [question] Upadte appears to succeed, but no data on select [question] Update appears to succeed, but no data on select Oct 28, 2019
@white-gecko
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Hello @retog,
thanks for giving it a try. The Quit Store currently only supports inserts to named graphs. We are somehow undecided, how to deal with the default graph. Due to some issue in the python rdflib (RDFLib/rdflib#811) we also cant query the default graph as union of all named graphs.

If you execute something like

PREFIX dc: <http://purl.org/dc/elements/1.1/>
INSERT DATA
{
  GRAPH <http://example.org/> {
    <http://example/book1> dc:title "A+new+book";
                  dc:creator "A.N.Other".
  }
}

and query

SELECT * {
  GRAPH ?g {
    ?s ?p ?o
  }
}

that should work

@retog
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retog commented Oct 28, 2019

It works! Thanks.

But the impossibility of union-default-graph is indeed a bummer.

@retog retog closed this as completed Oct 28, 2019
@retog
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retog commented Oct 28, 2019

Well maybe you could improve the response code to the update to something like: "400 Default graph not supported"

@retog retog reopened this Oct 28, 2019
@white-gecko white-gecko mentioned this issue Oct 28, 2019
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@white-gecko
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Yes that sounds good I've added a comment to #30

Regarding the union to query we also have an issue: #234

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@retog @white-gecko