Explain the difference between transient, persistent, and detached states in Hibernate.

Understanding the Difference Between Transient, Persistent, and Detached States in Hibernate

When working with Hibernate, it is crucial to grasp the distinctions between transient, persistent, and detached states. These states define the lifecycle of entities within the Hibernate framework.

Focus keyword: Hibernate states

Transient State:

In Hibernate, transient state refers to an object that has been instantiated but is not associated with any database table. This means the object is not stored in the database and does not have a unique identifier assigned to it. Any changes made to transient objects will not be reflected in the database.

Persistent State:

Entities in the persistent state are associated with a database table and have a unique identifier. Any changes made to persistent objects will be tracked by Hibernate and synchronized with the database during the transaction commit.

Detached State:

When an object transitions from the persistent state to the detached state, it means that the object is no longer associated with the current Hibernate session. However, the object still maintains its unique identifier and any modifications made to the object will not be automatically synchronized with the database. To reattach a detached object, it needs to be reassociated with a Hibernate session.

By understanding the differences between transient, persistent, and detached states in Hibernate, developers can effectively manage entity lifecycles and ensure data integrity in their applications.