RowSet Class

RowSet Class

Represents a result of a query returned by Cassandra.

The retrieval of the rows of a RowSet is generally paged (a first page of result is fetched and the next one is only fetched once all the results of the first one has been consumed). The size of the pages can be configured either globally through SetPageSize(Int32) or per-statement with SetPageSize(Int32). Though new pages are automatically (and transparently) fetched when needed, it is possible to force the retrieval of the next page early through FetchMoreResults.

The RowSet dequeues Row items while iterated. Parallel enumerations is supported and thread-safe. After a full enumeration of this instance, following enumerations will be empty, as all rows have been dequeued.

Inheritance Hierarchy

SystemObject
DseRowSet

Namespace: Dse
Assembly: Dse (in Dse.dll) Version: 2.1.0

Syntax

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public class RowSet : IEnumerable<Row>, 
	IEnumerable, IDisposable

The RowSet type exposes the following members.

Constructors

	Name	Description
	RowSet	Creates a new instance of RowSet.

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Methods

	Name	Description
	Dispose	Obsolete. For backward compatibility only
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	FetchMoreResults	Force the fetching the next page of results for this result set, if any.
	FetchMoreResultsAsync	Force the fetching the next page of results without blocking for this result set, if any.
	GetAvailableWithoutFetching	The number of rows available in this row set that can be retrieved without blocking to fetch.
	GetEnumerator
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetRows	For backward compatibility: It is possible to iterate using the RowSet as it is enumerable.
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	IsExhausted	Returns whether this ResultSet has more results. It has side-effects, if the internal queue has been consumed it will page for more results.
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Properties

	Name	Description
	Columns	Gets or sets the columns in the RowSet
	Info	Gets the execution info of the query
	IsFullyFetched	Whether all results from this result set has been fetched from the database.
	PagingState	Gets or sets the paging state of the query for the RowSet. When set it states that there are more pages.

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Remarks

RowSet paging is not available with the version 1 of the native protocol. If the protocol version 1 is in use, a RowSet is always fetched in it's entirely and it's up to the client to make sure that no query can yield ResultSet that won't hold in memory.

Reference

Dse Namespace