Hi,
I¹ve just spotted that for every SPARQL UPDATE query in the form:
DELETE ..
INSERT ..
WHERE ..
where in the where clause we¹re asking for blank nodes and combine the
triples¹ templates with UNION,
Fuseki produces a lot of warning messages about unbound quads.
For instance, for the query:
DELETE {
graph <http://test.com/graphs/graphs> { ?b0 void:triples ?triples0 . }
graph <http://test.com/graphs/graphs> { ?b1 void:triples ?triples1 . }
} INSERT {
graph <http://test.com/graphs/graphs> { ?b0 void:triples 5 . }
graph <http://test.com/graphs/graphs> { ?b1 void:triples 2 . }
} WHERE {
{ graph <http://test.com/graphs/graphs> { <http://test.com/graphs/someterms>
void:propertyPartition ?b0 .
?b0 void:property <http://xmlns.com/foaf/0.1/familyName> .
?b0 void:triples ?triples0 . }
} union
{ graph <http://test.com/graphs/graphs> { <http://test.com/graphs/someterms>
void:propertyPartition ?b1 .
?b1 void:property <http://xmlns.com/foaf/0.1/name> .
?b1 void:triples ?triples1 . }
} }
the following warnings are being generated:
WARN TemplateLib :: Unbound quad: <http://test.com/graphs/graphs>
?b1 <http://rdfs.org/ns/void#triples> ?triples1
WARN TemplateLib :: Unbound quad: <http://test.com/graphs/graphs>
?b0 <http://rdfs.org/ns/void#triples> ?triples0
WARN TemplateLib :: Unbound quad: <http://test.com/graphs/graphs>
?b1 <http://rdfs.org/ns/void#triples> 2
WARN TemplateLib :: Unbound quad: <http://test.com/graphs/graphs>
?b0 <http://rdfs.org/ns/void#triples> 5
Interestingly enough, despite the warnings, query is being executed
correctly.
So, shall I bother ? Or just leave with it ?
It seems that if we split the query into multiple ones (so that UNION is no
longer necessary in WHERE clause) then the warnings disappear.
But then, can I be sure that those multiple queries, if sent in one POST
request to Fuseki, are being executed in a single transaction, i.e. that
either all of them fail or success ?
Kind regards,
Rafal Ozga
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