Hibernate Framework Hibernate Associations and Relationships 2

Question 1

Which annotation is used to map a one-to-one relationship between two entities in Hibernate?

Accepted Answer

@OneToOne

Answer

@OneToOne maps a single entity instance on one side to a single entity instance on the other side of the relationship.

Question 2

By default, how does Hibernate manage a unidirectional @OneToMany mapping without @JoinColumn?

Accepted Answer

Using an automatically created join table

Answer

Without @JoinColumn, Hibernate creates a separate join table by default to manage a unidirectional @OneToMany relationship.

Question 3

Which CascadeType causes a delete operation on a parent entity to propagate to its child entities?

Accepted Answer

CascadeType.REMOVE

Answer

CascadeType.REMOVE propagates the remove (delete) operation from the parent entity to all associated child entities.

Question 4

What is the default FetchType for a @ManyToOne relationship in Hibernate?

Accepted Answer

FetchType.EAGER

Answer

@ManyToOne defaults to FetchType.EAGER, so the associated single entity is always loaded along with the owning entity.

Question 5

What is the purpose of the 'orphanRemoval = true' attribute in a @OneToMany annotation?

Accepted Answer

Automatically deletes child entities removed from the parent's collection

Answer

When orphanRemoval is true, removing a child entity from the parent's collection automatically triggers a DELETE for that child in the database.

Hibernate Framework Practice Test