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Flush vs CommitJPA's EntityManager provides several methods to manage the persistence of an entity.Two such methods are: void flush() // Synchronize the persistence context to the underlying database. getTransaction().commit() // Commit the current resource transaction, writing any unflushed changes to the database.Both these methods save the given entity into the database but there is a subtle difference in their working. flush can be used to save an entity immediately into the database. So it can be called multiple times in a transaction to save the entity piece-by-piece. getTransaction().commit() also flushes the data to the database but it also marks the end of the current transaction. So data written with flush() can still be rolled-back if the transaction is not yet complete. But with getTransaction().commit(), data cannot be rolled back. |
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