U4. ORM Hibernate

What is the main advantage of using Hibernate over JDBC?

• Direct manipulation of SQL queries

• Abstracting database operations using Java objects

• Faster execution speed compared to raw SQL

• No need for database configuration

In Hibernate, which method is used to begin a transaction?

• session.startTransaction()

• session.begin()

• session.beginTransaction()

• session.newTransaction()

Which of the following statements about HQL (Hibernate Query Language) is true?

• HQL works directly with database tables

• HQL is case-sensitive for class names and properties

• HQL allows using * as a wildcard for selecting all columns

• HQL does not support aggregate functions

What will happen if a getReference() method is called with a non-existent entity ID?

• It returns null

• It throws an EntityNotFoundException

• It retrieves an empty proxy object

• It automatically creates a new entity in the database

What is the purpose of the SessionFactory class in Hibernate?

• To perform CRUD operations

• To manage database transactions

• To create and manage Session objects

• To execute HQL queries

In Hibernate, what is the default fetching strategy for @OneToMany relationships?

• Eager loading

• Lazy loading

• Immediate loading

• Explicit loading

Which of the following methods is used to persist an object in Hibernate?

• session.store()

• session.insert()

• session.persist()

• session.saveObject()

Fill in the blank: The method used to retrieve a single result from a query in Hibernate is ___________.

• .getResultList()

• .uniqueResult()

• .fetchSingle()

• .getOne()

What will happen if .uniqueResult() is used and more than one result is found?

• It returns the first result

• It throws an exception

• It returns an empty list

• It executes a rollback

Which of the following is NOT a valid aggregate function in HQL?

• avg(...)

• sum(...)

• min(...)

• group_concat(...)