Interface JdbcClient.MappedQuerySpec<T extends @nullable Object>

Type Parameters:

T - the RowMapper-declared result type

Enclosing interface:

JdbcClient

public static interface JdbcClient.MappedQuerySpec<T extends @nullable Object>

A specification for RowMapper-mapped queries.

Since:

6.1

Author:

Juergen Hoeller, Sam Brannen

Method Summary

Modifier and Type	Method	Description
List<T>	list()	Retrieve the result as a pre-resolved list of mapped objects, retaining the order from the original database result.
default Optional<@Nonnull T>	optional()	Retrieve a single result, if available, as an Optional handle.
default Set<T>	set()	Retrieve the result as an order-preserving set of mapped objects.
default @Nonnull T	single()	Retrieve a single result as a required object instance.
Stream<T>	stream()	Retrieve the result as a lazily resolved stream of mapped objects, retaining the order from the original database result.

Method Details

stream

Stream<T> stream()

Retrieve the result as a lazily resolved stream of mapped objects, retaining the order from the original database result.

Returns:

the result Stream, containing mapped objects, needing to be closed once fully processed (for example, through a try-with-resources clause)

list

List<T> list()

Retrieve the result as a pre-resolved list of mapped objects, retaining the order from the original database result.

Returns:

the result as a detached List, containing mapped objects

set

default Set<T> set()

Retrieve the result as an order-preserving set of mapped objects.

Returns:

the result as a detached Set, containing mapped objects

See Also:

• list()
• LinkedHashSet

single

default @Nonnull T single()

Retrieve a single result as a required object instance.

Note: As of 6.2, this will enforce non-null result values as originally designed (just accidentally not enforced before).

Returns:

the single result object (never null)

See Also:

• optional()
• DataAccessUtils.requiredSingleResult(Collection)

optional

default Optional<@Nonnull T> optional()

Retrieve a single result, if available, as an Optional handle.

Returns:

an Optional handle with a single result object or none

See Also:

• single()
• DataAccessUtils.optionalResult(Collection)