I am trying execute following statement in openRDF workbench - 2.6.6
delete {
?s ?p ?o .
}
I get following error:
Encountered " "delete" "delete "" at line 5, column 1.
Was expecting one of:
"base" ...
"prefix" ...
"select" ...
"construct" ...
"describe" ...
"ask" ...
What should I used then?
EDIT:
I was able to remove statements by clicking remove on left menu. However, I am trying to come up with query to do it programmatic.
You need to use the 'SPARQL Update' menu option instead of the 'Query' option.
Related
I have a data source file that one of its properties is an actual class instance:
<clinic:Radiology rdf:ID="rad1234">
<clinic:diagnosis>Stage 4</clinic:diagnosis>
<clinic:ProvidedBy rdf:resource="#MountSinai"/>
<clinic:ReceivedBy rdf:resource="#JohnSmith"/>
<clinic:patientId>7890123</clinic:patientId>
<clinic:radiologyDate>01-01-2017</clinic:radiologyDate>
</clinic:Radiology>
so clinic:ProvidedBy is pointing to this:
<clinic:Radiologists rdf:ID="MountSinai">
<clinic:name>Mount Sinai</clinic:name>
<clinic:npi>1234567</clinic:npi>
<clinic:specialty>Oncology</clinic:specialty>
</clinic:Radiologists>
How do I query using the property clinic:providedBy (which is of type clinic:Radiologists)? Whatever I have tried does not bring back results.
It's also not clear what exactly you want to have, so my answer will return "all radiology resources that are provided by MountSinai":
PREFIX clinic: <THE NAMESPACE OF_THE_CLINIC_PREFIX>
PREFIX : <THE_BASE_NAMESPACE_OF_YOUR_RDF_DOCUMENT>
SELECT DISTINCT ?s WHERE {
?s clinic:ProvidedBy :MountSinai
}
But, I really suggest to start with an RDF and SPARQL tutorial, since form your comment your query
SELECT * WHERE { ?x rdf:resource "#MountSinai" }
is missing fundamental SPARQL basics. And for writing a matching SPARQL query it'S always good to have a look at the data in Turtle resp. N-Triples format both of which being closer to the SPARQL syntax.
I am trying to do a simple insert query in the web interface of Fuseki server. I have set the endpoint to /update (instead of the default /sparql).
I have the following query from https://www.w3.org/Submission/SPARQL-Update/:
PREFIX dc: <http://purl.org/dc/elements/1.1/>
INSERT { <http://example/egbook3> dc:title "This is an example title" }
This query gets translated to:
http://localhost:3033/dataset.html#query=PREFIX+dc%3A+%3Chttp%3A%2F%2Fpurl.org%2Fdc%2Felements%2F1.1%2F%3E%0AINSERT+%7B+%3Chttp%3A%2F%2Fexample%2Fegbook3%3E+dc%3Atitle++%22This+is+an+example+title%22+%7D%0A
or
curl http://localhost:3033/infUpdate/update -X POST --data 'update=PREFIX+dc%3A+%3Chttp%3A%2F%2Fpurl.org%2Fdc%2Felements%2F1.1%2F%3E%0AINSERT+%7B+%3Chttp%3A%2F%2Fexample%2Fegbook3%3E+dc%3Atitle++%22This+is+an+example+title%22+%7D%0A' -H 'Accept: text/plain,*/*;q=0.9' as visible using the Share your query button.
The query returns the following error:
Error 400: Encountered "<EOF>" at line 2, column 73.
Was expecting one of:
"where" ...
"using" ...
Fuseki - version 2.4.0 (Build date: 2016-05-10T11:59:39+0000)
The error occurs both in the web interface and with curl. What could be the problem here? SELECT queries work without problems. Loading triples from a file through the web interface upload form also works. Additional question: the normal post request uses query= and the curl version uses update=, why is this different?
The document you're referencing is the 2008 SPARQL Update submission, not the actual 2013 SPARQL 1.1 recommendation. The recommendation is the actual standard, the submission is not.
An update (insert or delete) isn't a query (select, ask, construct), and the syntax for the two kinds of query aren't necessarily the same. You note (correctly) that WHERE is optional in a select query, but that doesn't mean that it's optional in an insert. There are two forms of insert. There's INSERT DATA which has the syntax:
INSERT DATA QuadData
and there's DELETE/INSERT which has the syntax:
( WITH IRIref )?
( ( DeleteClause InsertClause? ) | InsertClause )
( USING ( NAMED )? IRIref )*
WHERE GroupGraphPattern
DeleteClause ::= DELETE QuadPattern
InsertClause ::= INSERT QuadPattern
So if you're using INSERT { … }, then that's the InsertClause of a DELETE/INSERT form, and you need to follow it with WHERE …. Since you're using static data, you should probably just use the INSERT DATA form:
PREFIX dc: <http://purl.org/dc/elements/1.1/>
INSERT DATA { <http://example/egbook3> dc:title "This is an example title" }
I have a query to get some similar instances for a specific instance, which is owbes:Dies_Irae instance. This is the query:
CONSTRUCT { ?recommendable0 ?predicate0 ?similarity0 } WHERE {
?recommendable0 ?predicate0 ?object0.
owbes:Dies_Irae ?predicate0 ?object0.
?predicate0 owbes:hasSimilarityValue ?similarity0.
?recommendable0 rdf:type ?someType.
?someType rdfs:subClassOf owbes:Recommendable.
}
It works fine, I get in the results what I'm supposed to. However, I also get the same instance owbes:Dies_Irae. Is there a way to exclude it from the result?
Well, I'm sure there is. I tried to search, I found that there is a filter, I tried to use it, but no succeed. This is the filter that I apply FILTER (?recmmendable0 != owbes:Dies_Irae)
I also tried to check if both of them have the same rdf:about but it didn't work.
Here you go the result:
<http://www.welovethesemanticweb.com/recommendation-systems#Requiem:_Sequentia>
recommendation-systems:hasArtist
"0.4"^^xsd:double .
recommendation-systems:Le_nozze_di_Figaro
recommendation-systems:hasArtist
"0.4"^^xsd:double .
recommendation-systems:Dies_Irae
recommendation-systems:hasArtist
"0.4"^^xsd:double .
as you see, the last instance is the one that I'd like to exclude
FILTER (?recmmendable0 != owbes:Dies_Irae)
You didn't spell recommendable0 correctly in your filter. Since the variable isn't used anywhere else, it never has a value, so the filter doesn't have anything to compare.
I run a Virtuoso Server and missed a number of results when making a SPARQL-Select request. I tracked it down and find a really strange behaviour, that I cannot explain.
But to start from the beginning.
The endpoint I query can be found at http://creativeartefact.org/sparql
I) Check for a specific triple:
ASK WHERE {
<http://creativeartefact.org/mbrainzImport/f18e677a-4051-486a-aa64-d9a3bfef90af>
<http://creativeartefact.org/ontology/represents>
<http://creativeartefact.org/mbrainzImport/35ed9f2a-6ce4-44ca-9c7a-967377b0e007>. }
The query returns TRUE
II) Now getting a bit more unspecific:
ASK WHERE {
?s
<http://creativeartefact.org/ontology/represents>
<http://creativeartefact.org/mbrainzImport/35ed9f2a-6ce4-44ca-9c7a-967377b0e007>. }
If the first returns true, the second shall do as well, shouldn't it? But it doesn't. It return FALSE!
If I replace the predicate or the object with a variable, it returns true as expected. Only when setting a variable for the subject, it returns false.
That the data really exists in the triple store can be tested by running the query
SELECT * WHERE {
?s
?p
<http://creativeartefact.org/mbrainzImport/35ed9f2a-6ce4-44ca-9c7a-967377b0e007>. }
You will see, that both results comw with p = http://creativeartefact.org/ontology/represents - which is exactly the predicate I am asking for in the former query.
To make it even more strange, there ARE triples with the aforementioned format, that return the triples:
select * {
?s
<http://creativeartefact.org/ontology/represents>
<http://creativeartefact.org/mbrainzImport/e4003568-5645-4ee1-abd0-2e8156272e59>. }
Any idea, what is happening here?
Thanks in advance,
Frank
The Virtuoso being used is an original 07.00.3203 build from 2013.
I would suggest upgrading to the latest Virtuoso 07.10.3211, open source or commercial, depending on which is in use here, and see if the problem persists ...
I am trying to perform a simple update of the value of a property that that has a given resource as its subject.
Here is my query:
WITH <http://127.0.0.1:3000/dendro_graph>
DELETE { <http://127.0.0.1:3000/project/datanotes/records/teste/filho%20do%20teste> <http://purl.org/dc/elements/1.1/creator> ?o0 .
}
INSERT
{
<http://127.0.0.1:3000/project/datanotes/records/teste/filho%20do%20teste> <http://purl.org/dc/elements/1.1/creator> "creator1" .
}
WHERE { <http://127.0.0.1:3000/project/datanotes/records/teste/filho%20do%20teste> <http://purl.org/dc/elements/1.1/creator> ?o0 .
}
The result of this is that the delete is executed, but the insert is not; I end up destroying all instances of the property, but no new value is added.
If I remove the WHERE clause, I end up with duplicate triples, because it seems the DELETE is not executed.
What am I doing wrong?
EDIT:
This code produces the duplicates:
WITH <http://127.0.0.1:3000/dendro_graph>
DELETE
{
<http://127.0.0.1:3000/project/datanotes/records/teste/filho%20do%20teste> <http://purl.org/dc/elements/1.1/creator> ?o0 .
}
INSERT
{
<http://127.0.0.1:3000/project/datanotes/records/teste/filho%20do%20teste> <http://purl.org/dc/elements/1.1/creator> "creator1" .
}
The query without the WHERE clause is not a legal SPARQL expression, and should have resulted in a syntax error. If the engine you're using accepts this, then that is a bug in that engine.
At first glance, ditto for the earlier operation, which you say deletes but does not insert: as far as I can see the SPARQL expression is correct, and if as you say the insert part does not get executed, that means you've discovered a bug in the engine that executes it. I recommend you get in touch with the developers directly.
Here is a workaround I used to get this working (finally thank God). It seems you can specify several operations to be executed over the graph in a single operation using the semicolon ;.
I ended up specifying the DELETE statement and then the UPDATE one
Check this out for code sample : SPARQL Update example for updating more than one triple in a single query