public static object Execute(ODataQueryOptions options, string sparqlEndpoint, string nameSpace)
{
Uri NamespaceUri = new Uri(nameSpace);
string queryString = new SparqlBuilder(options, NamespaceUri).BuildSparql();
IGraph graph = null;
using (var connector = new SparqlConnector(new Uri(sparqlEndpoint)))
{
graph = connector.Query(queryString) as IGraph;
}
RdfSerializer serializer = new RdfSerializer();
IEnumerable <BaseResource> ontologyInstances = serializer.Deserialize(graph, typeof(Person).Assembly, NamespaceUri);
return(ontologyInstances);
}
public static object Execute(ODataQueryOptions options, string sparqlEndpoint, string nameSpace)
{
Uri namespaceUri = new Uri(nameSpace);
string queryString = new SparqlBuilder(options, namespaceUri).BuildSparql();
if (options.Count != null && options.Count.Value)
{
string selectStr;
var entitySeg = options.Context.Path.Segments.Last() as EntitySetSegment;;
if (entitySeg != null)
{
selectStr = $" SELECT (count(?{entitySeg.EntitySet.Name}) as ?count) ";
}
else
{
var seg = options.Context.Path.Segments.Last() as NavigationPropertySegment;
selectStr = $" SELECT (count(?{seg.NavigationProperty.Name}) as ?count) ";
}
queryString = queryString.Substring(0, queryString.IndexOf("CONSTRUCT")) +
selectStr + queryString.Substring(queryString.IndexOf("WHERE"));
string count = null;
using (var connector = new SparqlConnector(new Uri(sparqlEndpoint)))
{
var results = connector.Query(queryString) as SparqlResultSet;
foreach (var result in results)
{
count = (result["count"] as LiteralNode).Value;
}
}
return(count);
}
else
{
IGraph graph = null;
using (var connector = new SparqlConnector(new Uri(sparqlEndpoint)))
{
graph = connector.Query(queryString) as IGraph;
}
RdfSerializer serializer = new RdfSerializer();
IEnumerable <BaseResource> ontologyInstances = serializer.Deserialize(graph, typeof(Person).Assembly, namespaceUri);
return(ontologyInstances);
}
}
