Hibernate Framework Hibernate Mapping 3

Question 1

What does the @Table annotation do in Hibernate?

Accepted Answer

Specifies the database table name for an entity

Answer

The @Table annotation customizes the database table name and schema that the entity maps to.

Question 2

Which inheritance strategy stores all classes in a single table?

Accepted Answer

SINGLE_TABLE

Answer

The SINGLE_TABLE strategy maps an entire inheritance hierarchy to one database table using a discriminator column.

Question 3

What is the purpose of a discriminator column in Hibernate inheritance?

Accepted Answer

It identifies which subclass a row belongs to in SINGLE_TABLE strategy

Answer

The discriminator column holds a value that identifies which concrete subclass each row in a SINGLE_TABLE inheritance represents.

Question 4

Which annotation specifies the discriminator column in Hibernate?

Accepted Answer

@DiscriminatorColumn

Answer

The @DiscriminatorColumn annotation defines the column used to differentiate between entity types in a SINGLE_TABLE inheritance hierarchy.

Question 5

What does @Version do in a Hibernate entity?

Accepted Answer

Enables optimistic locking by tracking a version number

Answer

The @Version annotation marks a field for optimistic locking, where Hibernate increments the version on each update to detect concurrent modifications.

Hibernate Framework Practice Test

Hibernate Framework Practice Test

Hibernate Framework Hibernate Mapping 3