How to write code in C #, to add new data to the database

Question

Adding triplets to GraphDB

SparqlRemoteEndpoint endpoint = new SparqlRemoteEndpoint(new Uri("http://localhost:7200/sparql"), "http://localhost:7200/");
SparqlResultSet results = endpoint.QueryWithResultSet("PREFIX : <http://www.example.org/> INSERT DATA {:test :test :hhrh }");

why does not it work?

StardogConnector stardog = new StardogConnector("http://localhost:7200", "test", "admin", "posw");
stardog.Begin();
string query = "PREFIX : <http://www.example.org/>SELECT * WHERE {:" + line[0] + " ?k :" + line[1] + "}";
stardog.Query(query);
stardog.Commit();

another way, same problem. Created a DB on a lokalka

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Yes, I also came to this conclusion, I use GraphDB for the first time. Well, how can I implement it with a file? I wrote such code.

IGraph g = new Graph();

string sql = "PREFIX : <http://www.example.org/> INSERT DATA {:test :test :hhrh }";
g.LoadFromFile("t.n3"); 

Object results = g.ExecuteQuery(sql);

here comes such an error

VDS.RDF.Parsing.RdfParseException
HResult = 0x80131500
Message = [InsertKeywordToken at Line 1 Column 36 to Line 1 Column 42] Unexpected Token encountered - expected a BASE / PREFIX directive or a Query Keyword to start a Query
Source = dotNetRDF
Stack trace:
in VDS.RDF.Parsing.SparqlQueryParser.ParseInternal (SparqlQueryParserContext context)
in VDS.RDF.Parsing.SparqlQueryParser.ParseInternal (TextReader input)
in VDS.RDF.Parsing.SparqlQueryParser.ParseFromString (String queryString)
in VDS.RDF.GraphExtensions.ExecuteQuery (IGraph g, String sparqlQuery)
in algorAutoText.Program.Main (String [] args) in C: \ Users \ Denis \ source \ repos \ algorAutoText \ algorAutoText \ Program.cs: line 43

judging by mistake, I supposedly did not add BASE / PREFIX. But he is in the request

Answer 1

Update and delete queries come through the /statements endpoint,

ie /repositories/{repository_id}/statements .

You can see the RDF4J server REST API here:

http://docs.rdf4j.org/rest-api/#_the_rdf4j_server_rest_api

Answer 2

When you use the DELETE or INSERT keywords you are doing a SPARQL Update , not a Query. SPARQL separates Query and Update into two separate specifications and most triple stores implement them as two separate endpoints (eg for security reasons).

To do an update from dotNetRDF into a triple store you have two options.

1. You can work directly with the SPARQL update endpoint in which case you will need to check the documentation for your triple store to find out how to create the URL for that - see https://github.com/dotnetrdf/dotnetrdf/wiki/UserGuide-Updating-With-SPARQL#remote-updates for details.

2. Alternatively if your triple store is one of the ones supported by dotNetRDF (Stardog and Sesame/GraphDB both are), then there are convenience wrappers that make this a bit easier - for more information about this please refer to https://github.com/dotnetrdf/dotnetrdf/wiki/UserGuide-Triple-Store-Integration#update