jpaはすべてのレコードをクエリーします

public interface JpaSpecificationExecutor<T> {

    /**
     * Returns a single entity matching the given {@link Specification}.
     *
     * @param spec
     * @return
     */
    T findOne(Specification<T> spec);

    /**
     * Returns all entities matching the given {@link Specification}.
     *
     * @param spec
     * @return
     */
    List<T> findAll(Specification<T> spec);

    /**
     * Returns a {@link Page} of entities matching the given {@link Specification}.
     *
     * @param spec
     * @param pageable
     * @return
     */
    Page<T> findAll(Specification<T> spec, Pageable pageable);

    /**
     * Returns all entities matching the given {@link Specification} and {@link Sort}.
     *
     * @param spec
     * @param sort
     * @return
     */
    List<T> findAll(Specification<T> spec, Sort sort);

    /**
     * Returns the number of instances that the given {@link Specification} will return.
     *
     * @param spec the {@link Specification} to count instances for
     * @return the number of instances
     */
    long count(Specification<T> spec);
}