/// <summary>
/// Updates the properties of a resource in the backing RDF store.
/// </summary>
/// <param name="resource">Resource that is to be updated in the backing store.</param>
/// <param name="transaction">Transaction associated with this action.</param>
public virtual void UpdateResource(Resource resource, ITransaction transaction = null)
{
string updateString;
if (resource.IsNew)
{
updateString = string.Format(@"WITH {0} INSERT {{ {1} }} WHERE {{}}",
SparqlSerializer.SerializeUri(Uri),
SparqlSerializer.SerializeResource(resource, IgnoreUnmappedProperties));
}
else
{
updateString = string.Format(@"WITH {0} DELETE {{ {1} ?p ?o. }} INSERT {{ {2} }} WHERE {{ OPTIONAL {{ {1} ?p ?o. }} }}",
SparqlSerializer.SerializeUri(Uri),
SparqlSerializer.SerializeUri(resource.Uri),
SparqlSerializer.SerializeResource(resource, IgnoreUnmappedProperties));
}
SparqlUpdate update = new SparqlUpdate(updateString)
{
Resource = resource
};
ExecuteUpdate(update, transaction);
resource.IsNew = false;
resource.IsSynchronized = true;
}
/// <summary>
/// Updates the properties of a resource in the backing RDF store.
/// </summary>
/// <param name="resource">Resource that is to be updated in the backing store.</param>
/// <param name="transaction">ransaction associated with this action.</param>
public void UpdateResource(Resource resource, ITransaction transaction = null)
{
string updateString;
if (resource.IsNew)
{
updateString = string.Format(@"WITH {0} INSERT {{ {1} }} WHERE {{}}",
SparqlSerializer.SerializeUri(Uri),
SparqlSerializer.SerializeResource(resource));
}
else
{
updateString = string.Format(@"WITH {0} DELETE {{ {1} ?p ?o. }} INSERT {{ {2} }} WHERE {{ {1} ?p ?o. }} ",
SparqlSerializer.SerializeUri(Uri),
SparqlSerializer.SerializeUri(resource.Uri),
SparqlSerializer.SerializeResource(resource));
}
SparqlUpdate update = new SparqlUpdate(updateString);
update.Resource = resource;
ExecuteUpdate(update, transaction);
resource.IsNew = false;
}
/// <summary>
/// Removes the given resource from the model and its backing RDF store. Note that there is no verification
/// that the given resource and its stored representation have identical properties.
/// </summary>
/// <param name="uri">A Uniform Resource Identifier.</param>
/// <param name="transaction">Transaction associated with this action.</param>
public virtual void DeleteResource(Uri uri, ITransaction transaction = null)
{
// NOTE: Regrettably, dotNetRDF does not support the full SPARQL 1.1 update syntax. To be precise,
// it does not support FILTERs or OPTIONAL in Modify clauses. This requires us to formulate the
// deletion of the resource in subject and object of any triples in two statements.
SparqlUpdate deleteSubject = new SparqlUpdate(@"DELETE WHERE { GRAPH @graph { @subject ?p ?o . } }");
deleteSubject.Bind("@graph", Uri);
deleteSubject.Bind("@subject", uri);
_store.ExecuteNonQuery(deleteSubject, transaction);
SparqlUpdate deleteObject = new SparqlUpdate(@"DELETE WHERE { GRAPH @graph { ?s ?p @object . } }");
deleteObject.Bind("@graph", Uri);
deleteObject.Bind("@object", uri);
_store.ExecuteNonQuery(deleteObject, transaction);
}
/// <summary> /// Executes a query on the store which does not expect a result. /// </summary> /// <param name="update">SPARQL Update to be executed.</param> /// <param name="transaction">An optional transaction.</param> public abstract void ExecuteNonQuery(SparqlUpdate update, ITransaction transaction = null);
/// <summary>
/// Not supported. ModelGroups are read-only.
/// </summary>
/// <param name="update"></param>
/// <param name="transaction"></param>
public void ExecuteUpdate(SparqlUpdate update, ITransaction transaction = null)
{
throw new NotSupportedException();
}
/// <summary>
/// Execute a SPARQL Update.
/// </summary>
/// <param name="update">A SparqlUpdate object.</param>
/// <param name="transaction">Transaction associated with this action.</param>
public void ExecuteUpdate(SparqlUpdate update, ITransaction transaction = null)
{
_store.ExecuteNonQuery(update, transaction);
}
