getResults: Return all query results

In redland: RDF Library Bindings in R

Return all query results

Description

Return all query results

Usage

getResults(.Object, model, ...)

## S4 method for signature 'Query'
getResults(.Object, model, formatName = "rdfxml")

Arguments

.Object	a Query object
model	a Model object
...	additional parameters
formatName	a string specifying the RDF format name. Currently the supported formats are "rdfxml" ,"turtle", "json", "csv"

Details

After this method is called, the Query object is no longer usable and should be deleted "rm(query)" and a new object created.

Examples

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")
  #objectType="literal", language="en")
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")
results <- getResults(query, model, "turtle")
results <- getResults(query, model, "json")

# When the query object is no longer needed, the resources it had allocated can be freed.
freeQuery(query)
rm(query)

redland documentation built on May 31, 2023, 6:32 p.m.