Javascript/typescript client for querying a SaGe server, built on top of the sparql-engine framework.
Requirements:
npm install -g sage-clientgit clone https://github.com/Callidon/sage-client.git
cd sage-client
npm install --productionUsage: sage-client <server-url> <default-graph-iri> [options]
Execute a SPARQL query using a SaGe server and the IRI of the default RDF graph
Options:
-q, --query <query> evaluates the given SPARQL query
-f, --file <file> evaluates the SPARQL query stored in the given file
-h, --help output usage information
The SaGe client can also be used as a regular Javascript/Typescript library
const { SageClient, Spy } = require('sage-client')
// Create a spy to collect stats during query execution
const spy = new Spy()
// The URL of the SaGe server
const serverURL = 'http://sage.univ-nantes.fr/sparql'
// The IRI of the default graph
const defaultGraph = 'http://sage.univ-nantes.fr/sparql/dbpedia-2016-04'
// The SPARQL query to execute
const query = `
prefix dbo: <http://dbpedia.org/ontology/>
prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT ?movie ?title ?name WHERE {
?movie dbo:starring [ rdfs:label 'Brad Pitt'@en ];
rdfs:label ?title;
dbo:director [ rdfs:label ?name ].
FILTER LANGMATCHES(LANG(?title), 'EN')
FILTER LANGMATCHES(LANG(?name), 'EN')
}`
// Create a new SaGe client
const client = new SageClient(serverURL, defaultGraph, spy)
// Execute the SPARQL query
client.execute(query).subscribe(b => {
// Print solutions bindings (in simple JSON format)
console.log(b.toObject())
}, (error) => {
// Report errors
console.error('ERROR: An error occurred during query execution.')
console.error(error.stack)
}, () => {
// Print some starts after the end of query execution
console.log('Query execution completed!')
console.log(`SPARQL query evaluated with ${spy.nbHTTPCalls} HTTP request(s)`)
})