CqlQuery(TEntity) Class

CqlQueryTEntity Class

Represents a Linq query that gets evaluated as a CQL statement.

Inheritance Hierarchy

SystemObject
  CassandraStatement
    Cassandra.Data.LinqCqlQueryBaseTEntity
      Cassandra.Data.LinqCqlQueryTEntity
        Cassandra.Data.LinqTableTEntity

Namespace: Cassandra.Data.Linq
Assembly: Cassandra (in Cassandra.dll) Version: 3.7.0

Syntax

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public class CqlQuery<TEntity> : CqlQueryBase<TEntity>, 
	IQueryable<TEntity>, IEnumerable<TEntity>, IEnumerable, IQueryable, 
	IOrderedQueryable

Type Parameters

TEntity

The CqlQueryTEntity type exposes the following members.

Methods

	Name	Description
	ExecutePaged	Executes the query and returns a page of results
	ExecutePagedAsync	Asynchronously executes the query and returns a task of a page of results
	GetEnumerator
	SetConsistencyLevel
	SetPageSize	Sets the page size for this query. The page size controls how much resulting rows will be retrieved simultaneously (the goal being to avoid loading too much results in memory for queries yielding large results). Please note that while value as low as 1 can be used, it is highly discouraged to use such a low value in practice as it will yield very poor performance. If in doubt, leaving the default is probably a good idea.
	SetPagingState	Sets the paging state, a token representing the current page state of query used to continue paging by retrieving the following result page. Setting the paging state will disable automatic paging.
	SetSerialConsistencyLevel
	ToString	Generates and returns cql query for this instance (Overrides ObjectToString.)

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Extension Methods

	Name	Description
	AllowFilteringTSource	The ALLOW FILTERING option allows to explicitly allow queries that require filtering. Please note that a query using ALLOW FILTERING may thus have unpredictable performance (for the definition above), i.e. even a query that selects a handful of records may exhibit performance that depends on the total amount of data stored in the cluster. (Defined by CqlQueryExtensions.)
	CountTSource	Returns the number of rows matching the query. To execute this CqlScalar use Execute() method. (Defined by CqlQueryExtensions.)
	DeleteTSource	Returns a representation of a DELETE cql statement (Defined by CqlQueryExtensions.)
	DeleteIfTSource	Returns a representation of a DELETE ... IF ... cql statement, for Lightweight Transactions support (Defined by CqlQueryExtensions.)
	FirstTSource	Returns a CqlQuery which after execution will return the first element in a sequence. To execute this CqlQuery use Execute() method. (Defined by CqlQueryExtensions.)
	FirstOrDefaultTSource	Returns a CqlQuery which after execution will return the first element of a sequence, or a default value if the sequence contains no elements. To execute this CqlQuery use Execute() method. (Defined by CqlQueryExtensions.)
	OrderByTSource, TKey	Sorts the elements, which are returned from CqlQuery, in ascending order according to a key. (Defined by CqlQueryExtensions.)
	OrderByDescendingTSource, TKey	Sorts the elements, which are returned from CqlQuery, in ascending order according to a key. (Defined by CqlQueryExtensions.)
	SelectTSource, TResult	Projects each element of a sequence into a new form. (Defined by CqlQueryExtensions.)
	TakeTSource	Returns a CqlQuery which after execution will return IEnumerable<TSource> with specified number of contiguous elements from the start of a sequence. To execute this CqlQuery use Execute() method. (Defined by CqlQueryExtensions.)
	ThenByTSource, TKey	Sorts the elements, which are returned from CqlQuery, in ascending order according to a key. (Defined by CqlQueryExtensions.)
	ThenByDescendingTSource, TKey	Sorts the elements, which are returned from CqlQuery, in descending order according to a key. (Defined by CqlQueryExtensions.)
	UpdateTSource	Returns a representation of a UPDATE cql statement (Defined by CqlQueryExtensions.)
	UpdateIfTSource	Returns a representation of a UPDATE ... IF ... cql statement, for Lightweight Transactions support (Defined by CqlQueryExtensions.)
	UpdateIfExistsTSource	Returns a representation of a UPDATE ... IF EXISTS cql statement, for Lightweight Transactions support. (Defined by CqlQueryExtensions.)
	WhereTSource	Returns a CqlQuery which after execution returns filtered sequence of values based on a predicate. To execute this CqlQuery use Execute() method. (Defined by CqlQueryExtensions.)

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Properties

	Name	Description
	Provider	IQueryable.Provider implementation

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Reference

Cassandra.Data.Linq Namespace