Interface ExecutableSelectOperation.TerminatingResults<T>

All Known Subinterfaces:

ExecutableSelectOperation.ExecutableSelect<T>, ExecutableSelectOperation.SelectWithProjection<T>, ExecutableSelectOperation.SelectWithQuery<T>, ExecutableSelectOperation.SelectWithTable<T>, ExecutableSelectOperation.TerminatingSelect<T>

Enclosing interface:

ExecutableSelectOperation

public static interface ExecutableSelectOperation.TerminatingResults<T>

Trigger SELECT query execution by calling one of the terminating methods and return mapped results.

Since:

2.1

Author:

Mark Paluch, John Blum

Method Summary

Modifier and Type	Method	Description
List<T>	all()	Get all matching elements.
default Optional<T>	first()	Get the first result, or no result.
@Nullable T	firstValue()	Get the first result, or no result.
<R> ExecutableSelectOperation.TerminatingResults<R>	map(QueryResultConverter<? super T, ? extends R> converter)	Map the query result to a different type using QueryResultConverter.
default Optional<T>	one()	Get exactly zero or one result.
@Nullable T	oneValue()	Get exactly zero or one result.
Slice<T>	slice()	Execute the query with paging and convert the result set to a Slice of entities.
default Stream<T>	stream()	Stream all matching elements.

Method Details

map

@Contract("_ -> new")
<R> ExecutableSelectOperation.TerminatingResults<R> map(QueryResultConverter<? super T, ? extends R> converter)

Map the query result to a different type using QueryResultConverter.

Type Parameters:

R - type of the result.

Parameters:

converter - the converter, must not be null.

Returns:

new instance of ExecutableSelectOperation.TerminatingResults.

Throws:

IllegalArgumentException - if converter is null.

Since:

5.0

first

default Optional<T> first()

Get the first result, or no result.

Returns:

the first result or Optional.empty() if no match found.

See Also:

• firstValue()

firstValue

@Nullable T firstValue()

Get the first result, or no result.

Returns:

the first result or null if no match found.

one

default Optional<T> one()

Get exactly zero or one result.

Returns:

a single result or Optional.empty() if no match found.

Throws:

IncorrectResultSizeDataAccessException - if more than one match found.

See Also:

• oneValue()

oneValue

@Nullable T oneValue()

Get exactly zero or one result.

Returns:

the single result or null if no match found.

Throws:

IncorrectResultSizeDataAccessException - if more than one match found.

all

List<T> all()

Get all matching elements.

Returns:

a List of all the matching elements; never null.

See Also:

• List

slice

Slice<T> slice()

Execute the query with paging and convert the result set to a Slice of entities. A sliced query translates the effective fetch size to the page size.

Returns:

the converted results

Since:

5.0

stream

default Stream<T> stream()

Stream all matching elements.

Returns:

a Stream wrapping the Cassandra ResultSet, which needs to be closed; never null.

See Also:

• Stream
• all()