sparql-builder

SPARQL query builder written in TypeScript. Can be used from both TypeScript and JavaScript, although type-safety is lost in JavaScript.

It exposes the following classes:

• QueryBuilder - builder base class
  • SelectBuilder - SELECT query builder
  • DescribeBuilder - DESCRIBE query builder

Build

The build-dist.sh script does the following:

• compiles the TypeScript code using tsc
• runs unit tests using npm test
• packages the library with webpack
  • for use in the browser (window target, output in dist/window)
  • for use with Node.js (commonjs2 target, output in dist/node)

Usage

The builder is published as sparql-builder package on npm. Import it into your package.json:

    "dependencies": {
        "sparql-builder": "^1.0.6"
    }

Example:

Code in test.ts:

import { SelectBuilder } from 'sparql-builder';

let query = "SELECT ?s { ?s ?p ?o }";

let builder = SelectBuilder.fromString(query).
    limit(42).
    offset(66).
    orderBy(SelectBuilder.ordering(SelectBuilder.var("s"), true)).
    orderBy(SelectBuilder.ordering(SelectBuilder.var("p")));

console.log(builder.toString());

Output of tsc && node test.js:

SELECT ?s WHERE { ?s ?p ?o. }
ORDER BY DESC (?s) (?p)
OFFSET 66
LIMIT 42