Hibernate Framework Hibernate Mapping

Question 1

Which annotation maps a Java class field to a specific database column?

Accepted Answer

@Column

Answer

The @Column annotation customizes the mapping between a Java field and its corresponding database column.

Question 2

What does the @Id annotation signify in a Hibernate entity?

Accepted Answer

It marks the field as the primary key

Answer

The @Id annotation designates the field as the primary key of the entity's corresponding database table.

Question 3

Which @GeneratedValue strategy uses a database sequence?

Accepted Answer

GenerationType.SEQUENCE

Answer

GenerationType.SEQUENCE instructs Hibernate to use a database sequence object to generate primary key values.

Question 4

What is the difference between @OneToOne and @ManyToOne?

Accepted Answer

@OneToOne maps a unique relationship while @ManyToOne maps multiple entities to one

Answer

@OneToOne means one entity relates to exactly one other entity, while @ManyToOne means many entities can reference the same single entity.

Question 5

Which annotation marks a collection as a one-to-many relationship?

Accepted Answer

@OneToMany

Answer

The @OneToMany annotation maps a collection field where one entity owns many instances of another entity.

Hibernate Framework Practice Test