[hibernate-dev] Re: FetchMode.SELECT
I agree that this should be supported. Specifying a fetch mode should
IMO not change the fetch type to LAZY or EAGER.
Am 06.01.2021 um 04:50 schrieb Gail Badner:
> Should it be possible to force an eager association to be loaded by a
> separate query using @Fetch(FetchMode.SELECT)?
>
> I thought that Hibernate supported that for an EAGER association, but I see
> the documentation for FetchMode.SELECT
>
<https://docs.jboss.org/hibernate/orm/5.4/userguide/html_single/Hibernate_...
> says:
>
> "SELECT
> The association is going to be fetched lazily using a secondary select for
> each individual entity, collection, or join load. It’s equivalent to
> JPA FetchType.LAZY fetching strategy."
>
> The reason I ask is because I am trying to wrap up HHH-13085, which will
> change derived IDs mapped as a one-to-one association, currently loaded by
> a separate query, to instead be loaded in the same query that loads the
> dependent entity. I want to ensure that it is possible to revert back to
> loading that one-to-one association in a separate query after HHH-13085 is
> fixed.
>
> Currently, a StackOverflowError is thrown when loading an entity with an ID
> that is an bidirectional eager one-to-one association has FetchMode.SELECT
> mapped.
>
> @Entity(name = "Foo")public class Foo implements Serializable {
>
> @Id
> @GeneratedValue
> private Long id;
>
> @OneToOne(mappedBy = "foo", cascade = CascadeType.ALL)
> private Bar bar;
> }
>
> @Entity(name = "Bar")public class Bar implements Serializable {
> @Id
> @OneToOne(fetch = FetchType.EAGER)
> @Fetch(FetchMode.SELECT)
> @JoinColumn(name = "BAR_ID")
> private Foo foo;
> }
>
>
> According to the documentation, it sounds like @Fetch(FetchMode.SELECT)
> should make the association lazy. Is that really correct?
>
> Could someone please clarify the expected behavior?
>
> I created HHH-14390 <https://hibernate.atlassian.net/browse/HHH-14390> for
> the StackOverflowError. I've pushed some FailureExpected tests
>
<https://github.com/hibernate/hibernate-orm/commit/b40d1251e385a5fdb018f95...
> that reproduce this issue.
>
> Thanks,
> Gail
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