one-to-many Archives

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Difference Between One-to-Many, Many-to-One and Many-to-Many?

Ok so this is probably a trivial question but I’m having trouble visualizing and understanding the differences and when to use each. I’m ...

June 1, 2022
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How to express a One-To-Many relationship in Django?

I’m defining my Django models right now and I realized that there wasn’t a OneToManyField in the model field types. I’m sure there’s ...

May 25, 2022
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What is the meaning of the CascadeType.ALL for a @ManyToOne JPA association

I think I misunderstood the meaning of cascading in the context of a @ManyToOne relationship. The case: public class User { @OneToMany(fetch = ...

May 19, 2022
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Hibernate throws MultipleBagFetchException – cannot simultaneously fetch multiple bags

Hibernate throws this exception during SessionFactory creation: org.hibernate.loader.MultipleBagFetchException: cannot simultaneously fetch multiple bags This is my test case: Parent.java @Entity public Parent { ...

May 1, 2022
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