Should I use `session.persist()` or `session.save()` in Hibernate?

Comparing Hibernate's session.persist() and session.save() Methods

In Hibernate, both session.persist() and session.save() are used to make an object persistent. However, there are key differences between the two methods that impact their behavior in specific scenarios.

session.persist() vs. session.save()

Definition:

• persist(): Makes a transient instance persistent.
• save(): Does not guarantee making the instance persistent immediately or assigning an identifier.

Identifier Assignment:

• persist(): Does not guarantee immediate identifier assignment.
• save(): Returns an identifier, which may require executing an INSERT statement.

Transactional Requirements:

• persist(): Will not execute an INSERT outside of transaction boundaries.
• save(): Executes an INSERT immediately, even outside of transactions.

Implications:

• Persist: Ensures no INSERTs outside transactions, making it suitable for long-running conversations with extended Session/persistence context.
• Save: Assigns an identifier immediately (if needed), regardless of transaction status, which is not always desirable in extended conversations.

Example:

Consider a long-running conversation where the database is updated infrequently. Using persist() ensures that objects added to the Session will only be persisted when the transaction is committed. This avoids unnecessary INSERTs and potential data inconsistencies.

Conclusion:

Both session.persist() and session.save() have specific use cases. persist() guarantees persistence within transactions and avoids unnecessary INSERTs in long-running conversations. save(), on the other hand, assigns identifiers immediately, which can be useful for immediate usage of generated values but may be less efficient in certain scenarios.

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