Deprecated in favor of https://github.com/comunica/comunica-feature-hdt
A comunica SPARQL HDT Init Actor.
This module is part of the Comunica framework.
Click here to learn more about querying HDT files with Comunica.
HDT requires GCC 4.9 or higher to be available.
$ yarn global add @comunica/actor-init-sparql-hdtor
$ npm install -g @comunica/actor-init-sparql-hdtShow 100 triples from a HDT file:
$ comunica-sparql-hdt hdtFile@myfile.hdt "CONSTRUCT WHERE { ?s ?p ?o } LIMIT 100"Show the help with all options:
$ comunica-sparql-hdt --helpJust like Comunica SPARQL,
a dynamic variant (comunica-dynamic-sparql-hdt) also exists.
Read more about querying from the command line.
This engine can be used in JavaScript/TypeScript applications as follows:
const newEngine = require('@comunica/actor-init-sparql-hdt').newEngine;
const myEngine = newEngine();
const result = await myEngine.query(`
SELECT ?s ?p ?o WHERE {
?s ?p <http://dbpedia.org/resource/Belgium>.
?s ?p ?o
} LIMIT 100`, {
sources: ['http://fragments.dbpedia.org/2015/en'],
});
// Consume results as a stream (best performance)
result.bindingsStream.on('data', (binding) => {
console.log(binding.get('?s').value);
console.log(binding.get('?s').termType);
console.log(binding.get('?p').value);
console.log(binding.get('?o').value);
});
// Consume results as an array (easier)
const bindings = await result.bindings();
console.log(bindings[0].get('?s').value);
console.log(bindings[0].get('?s').termType);Read more about querying an application.
Start a webservice exposing http://fragments.dbpedia.org/2015-10/en via the SPARQL protocol, i.e., a SPARQL endpoint.
$ comunica-sparql-hdt-http hdtFile@/path/to/my/file.hdtShow the help with all options:
$ comunica-sparql-hdt-http --helpThe SPARQL endpoint can only be started dynamically.
An alternative config file can be passed via the COMUNICA_CONFIG environment variable.
Use bin/http.js when running in the GitHub repo.