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

@OneToMany

Answer

@Singleton

Answer

@UniqueRelation

Question 2

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

Accepted Answer

Using an automatically created join table

Answer

Using a foreign key on the child table

Answer

Using a shared primary key

Answer

Using an embedded composite key

Question 3

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

Accepted Answer

CascadeType.REMOVE

Answer

CascadeType.MERGE

Answer

CascadeType.PERSIST

Answer

CascadeType.REFRESH

Question 4

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

Accepted Answer

FetchType.EAGER

Answer

FetchType.LAZY

Answer

FetchType.SELECT

Answer

FetchType.JOIN

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

Prevents null foreign key values in the child table

Answer

Marks removed children as archived rather than deleted

Answer

Prevents adding duplicate entries to the collection

Question 6

In a @JoinTable annotation, which attribute specifies the foreign key columns referencing the owning entity's primary key?

Accepted Answer

joinColumns

Answer

inverseJoinColumns

Answer

referencedColumnName

Answer

primaryKeyJoin

Question 7

How can two entities share the same primary key value in a @OneToOne relationship in Hibernate?

Accepted Answer

Use @MapsId on the dependent entity combined with @OneToOne

Answer

Annotate both with @SharedPrimaryKey

Answer

Use @PrimaryKeyJoinColumn on both sides

Answer

Use @EmbeddedId on the parent entity