Master Hibernate and JPA with Spring Boot in 100 Steps - Step 16 - Implementing Insert and Update JPA Repository Methods

The video tutorial explains how to implement update and insert methods using the entity manager's merge function. It highlights that the same logic applies to both operations, as the entity manager determines whether to update or insert based on the presence of an ID. The tutorial demonstrates these operations in a JPA demo app, showing how queries are executed and how Hibernate assigns IDs using a sequence. It emphasizes the best practice of letting Hibernate handle ID assignment to ensure consistency and efficiency.

What is the purpose of the merge method in the context of updating or inserting a person?

Explain the difference between updating and inserting a person according to the entity manager.

How does Hibernate assign IDs to newly inserted persons?

What happens if an ID is not passed when inserting a new person?

Describe the sequence created by Hibernate for ID assignment.