TripleStore

This service allows you to interface with a Jena Fuseki triple store.

Features

• Basic triplestore operations (Query, Update, Insert, Delete)
• Dataset management

Sub-services

• DatasetService

Dependencies

• None

Install

$ yarn add @semapps/triplestore

Usage

const { TripleStoreService } = require('@semapps/triplestore');

module.exports = {
  mixins: [TripleStoreService],
  settings: {
    url: 'http://localhost:3030/',
    user: 'admin',
    password: 'admin',
    mainDataset: 'myDataSet',
  }
};

Settings

Property	Type	Default	Description
url	String	required	Jena Fuseki's root URL
user	String	required	Jena Fuseki's admin login
password	String	required	Jena Fuseki's admin password
mainDataset	String	required	Default dataset

Actions

The following service actions are available:

countTripleOfSubject

• Count all triples associated with a subject

Parameters

Property	Type	Default	Description
uri	String	required	Subject
webId	String	Logged user's webId	User doing the action
dataset	String	Main dataset	Dataset where to execute the operation
graphName	String	Default graph	Graph where to execute the operation

Return

Integer - Number of triples associated with the given subject

deleteOrphanBlankNodes

• Delete all orphan blank nodes in a given dataset and graph

Parameters

Property	Type	Default	Description
dataset	String	Main dataset	Dataset where to execute the operation
graphName	String	Default graph	Graph where to execute the operation

Return

None

dropAll

• Delete all triples on the given dataset

Parameters

Property	Type	Default	Description
webId	String	Logged user's webId	User doing the action
dataset	String	Main dataset	Dataset where to execute the operation

Return

None

insert

• Insert a list of triples
• Accept triples, turtle or JSON-LD (see @semapps/mime-types package)

Parameters

Property	Type	Default	Description
resource	Object, String	required	Triples to insert
contentType	String	text/turtle	Type of data provided (application/ld+json, text/turtle or application/n-triples)
webId	String	Logged user's webId	User doing the action
dataset	String	Main dataset	Dataset where to insert the data
graphName	String	Default graph	Graph where to insert the data

Return

None

query

• Execute a SPARQL Query and return result in accept type provided
• SELECT, CONSTRUCT, ASK queries are supported
• Accept triples, turtle or JSON-LD (see @semapps/mime-types package)

Parameters

Property	Type	Default	Description
query	String or Object	required	SPARQL query to execute (as a string or SPARQL.js object)
accept	String	required	Type to return (application/ld+json, text/turtle or application/n-triples)
webId	String	Logged user's webId	User doing the action
dataset	String	Main dataset	Dataset where to execute the query

Return

String or Object depending on accept

update

• Execute a SPARQL update query
• DELETE, INSERT queries supported (see specifications)

Parameters

Property	Type	Default	Description
query	String or Object	required	SPARQL Update to execute (as a string or SPARQL.js object)
webId	string	Logged user's webId	User doing the action
dataset	String	Main dataset	Dataset where to execute the operation

Return

None