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:

    • 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)