[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 > _______________________________________________ > hibernate-dev mailing list -- hibernate-dev(a)lists.jboss.org > To unsubscribe send an email to hibernate-dev-leave(a)lists.jboss.org > %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s _______________________________________________ hibernate-dev mailing list -- hibernate-dev(a)lists.jboss.org To unsubscribe send an email to hibernate-dev-leave(a)lists.jboss.org %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s