Storage-SPARQL-Query-And-Update.md

SPARQL Query and Update Endpoints

You can treat any publicly accessible SPARQL store which has both Query and Update endpoints as a read-write store using the ReadWriteSparqlConnector.

Note: If you were looking for documentation on querying a SPARQL endpoint please see Querying with SPARQL

Supported Capabilities

• Save, Load, Delete, Update and List Graphs
• SPARQL Query
• SPARQL Update

Warning

Note that updating a graph may not work correctly for blank node containing graphs.

Creating a Connection

You can create a connection either just by providing the endpoint URIs like so:

SparqlConnector sparql = new SparqlConnector(new Uri("http://example.org/query"), new Uri("http://example.org/update"));

Or you can provide a SparqlRemoteEndpoint and SparqlRemoteUpdateEndpoint instance like so:

SparqlRemoteEndpoint queryEndpoint = new SparqlRemoteEndpoint(new Uri("http://example.org/query"), "http://default-graph-uri");
SparqlRemoteUpdateEndpoint updateEndpoint = new SparqlRemoteUpdateEndpoint(new Uri("http://example.org/update"));

ReadWriteSparqlConnector sparql = new SparqlConnector(queryEndpoint, updateEndpoint);

In both cases there is an overload which takes a SparqlConnectorLoadMethods which determines whether the LoadGraph() method operates by making a CONSTRUCT or a DESCRIBE query, the default is CONSTRUCT