The Key Differences Between Transient, Persistent, and Detached Objects in Hibernate
When working with Hibernate, understanding the distinctions between transient, persistent, and detached objects is crucial for efficient data management and manipulation. Let's delve into the definitions and characteristics of each:
Transient Objects
Transient objects in Hibernate are instances that are not associated with any database table row. They are newly created objects that have not been saved to the database using a Hibernate session. These objects do not have a unique identifier and are not managed by Hibernate's session or cache.
Persistent Objects
Persistent objects are instances that are associated with a database table row. Once a transient object is saved using Hibernate's session, it becomes persistent. These objects have a unique identifier, are managed by the session, and any changes made to them are automatically synchronized with the database.
Detached Objects
Detached objects in Hibernate are objects that were once associated with a session but have been disconnected. This could happen when the session is closed, the object is explicitly evicted, or the object is serialized and deserialized. Detached objects are no longer managed by the session but can be reattached to a new session for further manipulation.
By understanding the differences between transient, persistent, and detached objects in Hibernate, developers can effectively control the lifecycle of their entities and optimize database operations.
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