public void SparqlGroupByWithEmptyResultSet()
{
//var query = "SELECT ?s (COUNT(?o) AS ?c) WHERE {?s a ?o} GROUP BY ?s";
var query = "SELECT ?s (COUNT(?o) AS ?c) WHERE {?s a ?o} GROUP BY ?s";
var m = new InMemoryManager();
var result = (SparqlResultSet)m.Query(query);
Assert.Empty(result.Results);
}
private static void Test(string query, bool isNamedGraph, int expectedCount)
{
IGraph graph = new Graph();
if (isNamedGraph)
{
graph.BaseUri = new Uri("http://g");
}
new TurtleParser().Load(graph, new StringReader(TestData));
IInMemoryQueryableStore store = new TripleStore();
store.Add(graph);
IQueryableStorage storage = new InMemoryManager(store);
using (SparqlResultSet resultSet = (SparqlResultSet)storage.Query(query))
{
Assert.Equal(expectedCount, resultSet.Count);
}
}
private static void Test(string query, string literal)
{
IGraph graph = new Graph();
graph.LoadFromString(TestData);
IInMemoryQueryableStore store = new TripleStore();
store.Add(graph);
IQueryableStorage storage = new InMemoryManager(store);
using (SparqlResultSet resultSet = (SparqlResultSet)storage.Query(query))
{
TestTools.ShowResults(resultSet);
Assert.Equal(1, resultSet.Count);
SparqlResult result = resultSet[0];
Assert.True(result.HasBoundValue("oo"));
Assert.Equal(graph.CreateLiteralNode(literal), result["oo"]);
}
}