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If you take a look at Hibernate flush order, you’ll see that the persist action is executed before the collection elements are handled.
This way, Hibernate inserts the child records first without the Foreign Key since the child entity does not store this information.
As straightforward as it might be in a RDBMS, when it comes to JPA, the annotation allows you to map the Foreign Key column in the child entity mapping so that the child has an entity object reference to its parent entity.
This is the most natural way of mapping a database database association, and, usually, the most efficient alternative too.
During the collection handling phase, the Foreign Key column is updated accordingly.
The same logic applies to collection state modifications, so when removing the firsts entry from the child collection: Again, the parent entity state change is executed first, which triggers the child entity update.
Lets see how it is used: @One To One(cascade = Cascade Type.
Now let’s take a look at how to transform our existing unidirectional relationship into a bidirectional one. ) Hibernate: insert into Employee (EMAIL, FIRST_NAME, LAST_NAME) values (? association links two tables based on a Foreign Key column so that the child table record references the Primary Key of the parent table row.My Entity Listener] - Book title: Hibernate Tips ,127 DEBUG [org.hibernate. SQL] - select nextval ('hibernate_sequence') ,160 DEBUG [org.hibernate.