Master Hibernate and JPA with Spring Boot in 100 Steps - Step 12 - Entity Manager Methods - clear and detach

The video tutorial explains the role of an entity manager in managing transactions, including persisting and merging entities. It demonstrates creating and persisting courses, using the flush method to send changes to the database, and detaching entities to stop tracking changes. The tutorial also covers clearing the entity manager to stop tracking all entities.

How can you prevent certain changes from being saved to the database?

What will happen to the entity if it is detached from the entity manager?

What are the implications of calling entity manager.clear()?