Master Hibernate and JPA with Spring Boot in 100 Steps - Step 18 - JPA and Hibernate Annotations - @UpdateTimestamp and

The video tutorial explains the importance of using timestamps for tracking updates and creation times in database rows. It introduces the LocalDateTime class from Java 8 as a better alternative to Java.util.Date for handling date and time. The tutorial covers Hibernate-specific annotations like @UpdateTimestamp and @CreationTimestamp to automate timestamp updates. It also demonstrates how to populate SQL data with timestamps and test these changes using the Entity Manager. Observations on how timestamps are reflected in the database are discussed.

Why is it important to store creation and update timestamps in a database row?

• To track changes and history of data entries

• To increase the size of the database

• To confuse the database users

• To make the database slower

What is the advantage of using LocalDateTime over util.Date in Java 8?

• LocalDateTime is more complex

• util.Date is more modern

• LocalDateTime provides a clearer representation of date and time

• util.Date is faster

Which annotation is used to automatically update the timestamp when a row is modified?

• @ChangeTimestamp

• @ModifyTimestamp

• @UpdateTimestamp

• @CreationTimestamp

What function is used to populate default timestamp values in SQL?

• NOW

• SYSDATE

• GETDATE

• CURRENT_DATE

In the demo application, what method is called at the startup to manage entities?

• startEntitySession

• manageEntities

• initializeEntities

• playWithEntityManager

What happens to the updated timestamp when a row is modified in the demo application?

• It is updated to the current timestamp

• It remains the same as the created timestamp

• It is deleted

• It is set to null

How does Hibernate ensure that timestamps are automatically populated?

• By using SQL triggers

• By using Hibernate annotations like @UpdateTimestamp and @CreationTimestamp

• By using database stored procedures

• By manually updating each row