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However, since we are most likely going to index these Foreign Keys, we are going to require twice as much memory to cache the index for this association. To fix the aforementioned extra join table issue, we just need to add the insert into post (title, id) values ('First post', 1) insert into post_comment (review, id) values ('My first review', 2) insert into post_comment (review, id) values ('My second review', 3) insert into post_comment (review, id) values ('My third review', 4) update post_comment set post_id = 1 where id = 2 update post_comment set post_id = 1 where id = 3 update post_comment set post_id = 1 where id = 4 A little bit better, but what’s the purpose of those three update statements?
If you take a look at Hibernate flush order, you’ll see that the persist action is executed before the collection elements are handled.
association between links two tables based on a Foreign Key column so that the child table record references the Primary Key of the parent table row.
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.
Specifically, I want to focus on the One-to-Many relationship in Hibernate and how we go about mapping it out in our Java objects.