Simple JS library to build SPARQL queries
npm install @tpluscode/sparql-builder> # @tpluscode/sparql-builder !Test  
Simple library to create SPARQL queries with tagged ES Template Strings
1. Focuses on graph patterns. No need to remember exact syntax
1. Still looks like SPARQL, having a familiar structure and little glue code
1. Has the IDE provide syntactic hints of valid SPARQL keywords
1. Ensures correct formatting of terms (URI nodes, literals variables) via @tpluscode/rdf-string
1. Automatically shortens URIs with @zazuko/prefixes
```
npm i -S @tpluscode/sparql-builder
To be able to execute queries against a remote endpoint install a peer
dependency:
``
npm i -S sparql-http-client
`js
import rdf from '@zazuko/env'
import { SELECT } from '@tpluscode/sparql-builder'
const ex = rdf.namespace('http://example.com/')
const { foaf } = rdf.ns
/*
PREFIX foaf:
SELECT ?person ?name
FROM
WHERE
{
?person a foaf:Person ;
foaf:name ?name .
}
*/
const person = rdf.variable('person')
const query =
SELECT${person} ?name
.FROM(ex.People)
.WHERE
${person} a ${foaf.Person} ;
${foaf.name} ?name .
.build()`
Using sparql-http-client
`js
import rdf from '@zazuko/env'
import SparqlHttp from 'sparql-http-client'
import { ASK } from '@tpluscode/sparql-builder'
const { dbo } = rdf.ns
const dbr = rdf.namespace('http://dbpedia.org/resource/')
const client = new SparqlHttp({
factory: rdf,
endpointUrl: 'http://dbpedia.org/sparql',
})
const scoobyDoo = dbr('Scooby-Doo')
/*
PREFIX dbo:
ASK {
}
*/
ASK${scoobyDoo} a ${dbo.Person}`
.execute(client)
.then(isScoobyAPerson => {
// Fun fact: DBpedia seems to claim that Scooby-Doo is indeed a Person...
return isScoobyAPerson
})
The example in docs/examples can be executed locally. To do so, first replace the package import to point to the repository root.
`diff`
-const { / / } = require('@tpluscode/sparql-builder')
+const { / / } = require('../..')
Then simply npm run example`.