Hibernate Framework Hibernate Associations and Relationships 3

Question 1

What happens when CascadeType.ALL is specified on a Hibernate association?

Accepted Answer

All JPA lifecycle operations cascade to the associated entity

Answer

CascadeType.ALL is a shorthand that includes PERSIST, MERGE, REMOVE, REFRESH, and DETACH — all lifecycle operations are cascaded to the associated entity.

Question 2

In a bidirectional @ManyToMany relationship, which side should contain the @JoinTable annotation?

Accepted Answer

The owning side — the side without 'mappedBy'

Answer

The owning side (the one without 'mappedBy') carries the @JoinTable annotation and is responsible for managing the join table definition.

Question 3

What defines a 'unidirectional' association in Hibernate?

Accepted Answer

An association where only one entity holds a reference to the other

Answer

A unidirectional association means only one entity has a field referencing the other; the other entity has no knowledge of the relationship.

Question 4

In a @JoinTable annotation, which attribute defines the foreign key columns referencing the inverse (non-owning) entity?

Accepted Answer

inverseJoinColumns

Answer

'inverseJoinColumns' specifies the join table columns that reference the primary key of the non-owning (inverse) entity in the relationship.

Question 5

What does fetch = FetchType.EAGER mean for a Hibernate association?

Accepted Answer

The associated entity is loaded immediately along with the parent entity

Answer

FetchType.EAGER tells Hibernate to load the associated entity immediately in the same query (or an additional query) when the parent entity is loaded.

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Hibernate Framework Hibernate Associations and Relationships 3