freeQuery | R Documentation |
Free memory used by a librdf query
freeQuery(.Object)
## S4 method for signature 'Query'
freeQuery(.Object)
.Object |
a Query object |
After this method is called, the Query object is no longer usable and should
be deleted "rm(query)"
and a new object created.
world <- new("World")
storage <- new("Storage", world, "hashes", name="", options="hash-type='memory'")
model <- new("Model", world, storage, options="")
stmt <- new("Statement", world=world,
subject="https://orcid.org/0000-0002-2192-403X",
predicate="http://www.w3.org/ns/prov#Agent",
object="slaughter",
objectType="literal", datatype_uri="http://www.w3.org/2001/XMLSchema#string")
status <- addStatement(model, stmt)
queryString <- paste("PREFIX orcid: <https://orcid.org/>",
"PREFIX dataone: <https://cn.dataone.org/cn/v1/resolve/>",
"PREFIX prov: <http://www.w3.org/ns/prov#>",
"SELECT ?a ?c WHERE { ?a prov:Agent ?c . }", sep=" ")
query <- new("Query", world, queryString, base_uri=NULL,
query_language="sparql", query_uri=NULL)
# Return all results as a string
results <- getResults(query, model, "rdfxml")
# When the query object is no longer needed, the resources it had allocated can be freed.
freeQuery(query)
rm(query)
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