Hibernate Framework Hibernate Associations and Relationships 1

Question 1

Which annotation is used to define a one-to-many relationship in Hibernate?

Accepted Answer

@OneToMany

Answer

@OneToMany maps a collection field in the parent entity to multiple records in the child entity.

Question 2

In a bidirectional one-to-many relationship, which side is considered the 'owning side'?

Accepted Answer

The 'many' side (child entity) with the foreign key

Answer

The 'many' side holds the foreign key column and is therefore the owning side responsible for the relationship in the database.

Question 3

Which annotation specifies the foreign key column name in a @ManyToOne relationship?

Accepted Answer

@JoinColumn

Answer

@JoinColumn specifies the name of the foreign key column in the owning entity's table that references the primary key of the related entity.

Question 4

What does the 'mappedBy' attribute in @OneToMany indicate?

Accepted Answer

The field in the owning entity that maps the relationship

Answer

'mappedBy' tells Hibernate that this side is the inverse (non-owning) side and points to the field in the child entity that owns the relationship.

Question 5

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

Accepted Answer

FetchType.LAZY

Answer

@OneToMany defaults to FetchType.LAZY, meaning the collection is not loaded from the database until it is explicitly accessed.

Hibernate Framework Practice Test