redland (version 1.0.17-18)

getResults: Return all query results

Description

Return all query results

Usage

getResults(.Object, model, ...)
# S4 method for 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: ",
                     "PREFIX dataone: ",
                     "PREFIX 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)