ISparqlDataset Interface

Interfaces for Datasets that SPARQL Queries and Updates can be applied to.

Namespace: VDS.RDF.Query.Datasets
Assembly: dotNetRDF (in dotNetRDF.dll) Version:

Syntax

public interface ISparqlDataset

Public Interface ISparqlDataset

The ISparqlDataset type exposes the following members.

Properties

	Name	Description
	ActiveGraphUris	Gets the enumeration of the Graph URIs that currently make up the active graph.
	DefaultGraphUris	Gets the enumeration of the Graph URIs that currently make up the default graph.
	Graphs	Gets all the Graphs in the Dataset.
	GraphUris	Gets all the URIs of Graphs in the Dataset.
	HasTriples	Gets whether the Dataset has any Triples.
	Item	Gets the Graph with the given URI from the Dataset.
	Triples	Gets all the Triples in the Dataset.
	UsesUnionDefaultGraph	Gets whether the Default Graph is treated as being the union of all Graphs in the dataset when no Default Graph is otherwise set.

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Methods

	Name	Description
	AddGraph	Adds a Graph to the Dataset.
	ContainsTriple	Gets whether the Dataset contains a specific Triple.
	Discard	Ensures that any changes to the Dataset (if any) are discarded.
	Flush	Ensures that any changes to the Dataset (if any) are flushed to the underlying Storage.
	GetModifiableGraph	Gets the Graph with the given URI from the Dataset.
	GetTriplesWithObject	Gets all the Triples in the Dataset with the given Object.
	GetTriplesWithPredicate	Gets all the Triples in the Dataset with the given Predicate.
	GetTriplesWithPredicateObject	Gets all the Triples in the Dataset with the given Predicate and Object.
	GetTriplesWithSubject	Gets all the Triples in the Dataset with the given Subject.
	GetTriplesWithSubjectObject	Gets all the Triples in the Dataset with the given Subject and Object.
	GetTriplesWithSubjectPredicate	Gets all the Triples in the Dataset with the given Subject and Predicate.
	HasGraph	Gets whether a Graph with the given URI is the Dataset.
	RemoveGraph	Removes a Graph from the Dataset.
	ResetActiveGraph	Resets the Active Graph to the previous Active Graph.
	ResetDefaultGraph	Resets the Default Graph to the previous Default Graph.
	SetActiveGraph(IEnumerableUri)	Sets the Active Graph to be the merge of the Graphs with the given URIs.
	SetActiveGraph(Uri)	Sets the Active Graph to be the Graph with the given URI.
	SetDefaultGraph(IEnumerableUri)	Sets the Default Graph to be the merge of the Graphs with the given URIs.
	SetDefaultGraph(Uri)	Sets the Default Graph to be the Graph with the given URI.

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Remarks

Note: For all operations that take a Graph URI a null Uri should be considered to refer to the Default Graph of the dataset.

Default and Active Graph

Leviathan expects that a Query operates over the Dataset in the following order:

If an Active Graph is set then Queries operate over that
Otherwise if a Default Graph is set then Queries operate over that
Finally the Queries operate over the all triples, the notion of all triples may be dataset implementation specific i.e. may be union of all graphs, the default unnamed graph only or something else entirely

Please note that the Query may change the Active and Default Graph over the course of the query depending on the Query e.g. FROM, FROM NAMED and GRAPH all can potentially change these.

You can limit your queries to use specific portions of your dataset by using the SetActiveGraph() and SetDefaultGraph() methods on your dataset instance before then passing it to the LeviathanQueryProcessor.

Note: By default the InMemoryDataset uses the Union of all Graphs in the Dataset if no Active/Default Graph is otherwise specified. Use the UsesUnionDefaultGraph property to see whether a Dataset implementation behaves in this way.

Reference

VDS.RDF.Query.Datasets Namespace