BaseTransactionalDataset Class

Abstract Base Class for Mutable Datasets that support Transactions.

Inheritance Hierarchy

SystemObject
  VDS.RDF.Query.DatasetsBaseDataset
    VDS.RDF.Query.DatasetsBaseTransactionalDataset
      VDS.RDF.Query.DatasetsInMemoryDataset

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

Syntax

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public abstract class BaseTransactionalDataset : BaseDataset

Public MustInherit Class BaseTransactionalDataset
	Inherits BaseDataset

The BaseTransactionalDataset type exposes the following members.

Constructors

	Name	Description
	BaseTransactionalDataset	Creates a new Transactional Dataset.
	BaseTransactionalDataset(Boolean)	Creates a new Transactional Dataset with the given Union Default Graph setting.
	BaseTransactionalDataset(Uri)	Creates a new Transactional Dataset with a fixed Default Graph and no Union Default Graph.

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Properties

	Name	Description
	ActiveGraphUris	Gets the Active Graph URIs. (Inherited from BaseDataset.)
	DefaultGraphUris	Gets the Default Graph URIs. (Inherited from BaseDataset.)
	Graphs	Gets all the Graphs in the Dataset. (Inherited from BaseDataset.)
	GraphUris	Gets all the URIs of Graphs in the Dataset. (Inherited from BaseDataset.)
	HasTriples	Gets whether the Dataset has any Triples. (Inherited from BaseDataset.)
	InternalDefaultGraph	Gets a reference to the actual IGraph that is currently treated as the default graph. (Inherited from BaseDataset.)
	Item	Gets a Graph from the Dataset. (Overrides BaseDatasetItemUri.)
	Triples	Gets all the Triples in the Dataset. (Inherited from BaseDataset.)
	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. (Inherited from BaseDataset.)

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Methods

	Name	Description
	AddGraph	Adds a Graph to the Dataset. (Overrides BaseDatasetAddGraph(IGraph).)
	AddGraphInternal	Adds a Graph to the Dataset.
	ContainsTriple	Gets whether the Dataset contains a specific Triple. (Inherited from BaseDataset.)
	ContainsTripleInternal	Determines whether the Dataset contains a specific Triple. (Inherited from BaseDataset.)
	Discard	Ensures that any changes to the Dataset (if any) are discarded. (Overrides BaseDatasetDiscard.)
	DiscardInternal	Allows the derived dataset to take any post-Discard() actions required.
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	Flush	Ensures that any changes to the Dataset (if any) are flushed to the underlying Storage. (Overrides BaseDatasetFlush.)
	FlushInternal	Allows the derived dataset to take any post-Flush() actions required.
	GetAllTriples	Abstract method that concrete implementations must implement to return an enumerable of all the Triples in the Dataset. (Inherited from BaseDataset.)
	GetGraphInternal	Gets the given Graph from the Dataset. (Inherited from BaseDataset.)
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetModifiableGraph	Gets a Graph from the Dataset that can be modified. (Overrides BaseDatasetGetModifiableGraph(Uri).)
	GetModifiableGraphInternal	Gets a Graph from the Dataset that can be modified transactionally.
	GetTriplesWithObject	Gets all the Triples in the Dataset with the given Object. (Inherited from BaseDataset.)
	GetTriplesWithObjectInternal	Gets all the Triples in the Dataset with the given Object. (Inherited from BaseDataset.)
	GetTriplesWithPredicate	Gets all the Triples in the Dataset with the given Predicate. (Inherited from BaseDataset.)
	GetTriplesWithPredicateInternal	Gets all the Triples in the Dataset with the given Predicate. (Inherited from BaseDataset.)
	GetTriplesWithPredicateObject	Gets all the Triples in the Dataset with the given Predicate and Object. (Inherited from BaseDataset.)
	GetTriplesWithPredicateObjectInternal	Gets all the Triples in the Dataset with the given Predicate and Object. (Inherited from BaseDataset.)
	GetTriplesWithSubject	Gets all the Triples in the Dataset with the given Subject. (Inherited from BaseDataset.)
	GetTriplesWithSubjectInternal	Gets all the Triples in the Dataset with the given Subject. (Inherited from BaseDataset.)
	GetTriplesWithSubjectObject	Gets all the Triples in the Dataset with the given Subject and Object. (Inherited from BaseDataset.)
	GetTriplesWithSubjectObjectInternal	Gets all the Triples in the Dataset with the given Subject and Object. (Inherited from BaseDataset.)
	GetTriplesWithSubjectPredicate	Gets all the Triples in the Dataset with the given Subject and Predicate. (Inherited from BaseDataset.)
	GetTriplesWithSubjectPredicateInternal	Gets all the Triples in the Dataset with the given Subject and Predicate. (Inherited from BaseDataset.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	HasGraph	Gets whether a Graph with the given URI is the Dataset. (Inherited from BaseDataset.)
	HasGraphInternal	Determines whether a given Graph exists in the Dataset. (Inherited from BaseDataset.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	RemoveGraph	Removes a Graph from the Dataset. (Overrides BaseDatasetRemoveGraph(Uri).)
	RemoveGraphInternal	Removes a Graph from the Dataset. (Inherited from BaseDataset.)
	ResetActiveGraph	Sets the Active Graph for the SPARQL query to be the previous Active Graph. (Inherited from BaseDataset.)
	ResetDefaultGraph	Sets the Default Graph for the SPARQL Query to be the previous Default Graph. (Inherited from BaseDataset.)
	SetActiveGraph(IEnumerableUri)	Sets the Active Graph for the SPARQL query. (Inherited from BaseDataset.)
	SetActiveGraph(Uri)	Sets the Active Graph for the SPARQL query. (Inherited from BaseDataset.)
	SetDefaultGraph(IEnumerableUri)	Sets the Default Graph. (Inherited from BaseDataset.)
	SetDefaultGraph(Uri)	Sets the Default Graph. (Inherited from BaseDataset.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Remarks

The Transaction implementation of dotNetRDF is based upon a MRSW concurrency model, since only one writer may be active changes are immediately pushed to the dataset and visible within the transaction and they are committed or rolled back when Flush() or Discard() are called.

So in practical terms it is perfectly OK for the storage to be updated during a transaction because if the transaction fails the changes will be rolled back because all changes are stored in-memory until the end of the transaction. This may not be an ideal transaction model for all scenarios so you may wish to implement your own version of transactions or code your implementations of the abstract methods accordingly to limit actual persistence to the end of a transaction.

Reference

VDS.RDF.Query.Datasets Namespace