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Mapping Relationships with Hibernate
Manage episode 435157851 series 3594147
Kandungan disediakan oleh Trevor Page: Java Guru | Programmer | Teacher. Semua kandungan podcast termasuk episod, grafik dan perihalan podcast dimuat naik dan disediakan terus oleh Trevor Page: Java Guru | Programmer | Teacher atau rakan kongsi platform podcast mereka. Jika anda percaya seseorang menggunakan karya berhak cipta anda tanpa kebenaran anda, anda boleh mengikuti proses yang digariskan di sini https://ms.player.fm/legal.
In the past we have learned about database relationships, specifically the One-to-Many as well as the Many-to-Many and One-to-One and that was all good, great and grand…
But now I want to talk about how to create those same relationships inside of Hibernate.
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.
But before we do, a word on unidirectional and bidirectional relationships.
Unidirectional vs BidirectionalIn Hibernate, it’s possible to map all three relationships that are available in a standard database, these include:
- One-to-One
- One-to-Many
- Many-to-Many
But what Hibernate also includes is the ability to make EACH of those relationships either unidirectional or bidirectional.
This means that we can have a unidirectional One-to-One and a bidirectional One-to-One mapping, as well as a unidirectional One-to-Many and a bidirectional One-to-Many, as well as a unidirectional Many-to-Many and a bidirectional Many-to-Many relationship.
That’s a lot of relationships!
So what exactly are unidirectional and bidirectional relationships?
Learn more on the show notes page via http://howtoprogramwithjava.com/session53
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