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原文地址：https://developer.jboss.org/wiki/HibernateFAQ-CommonProblems
I don't know if I should use save() or persist().
Both methods make a transient instance persistent. However, the persist() method doesn't guarantee(保证) that the identifier value will be assigned to the persistent instance immediately, the assignment might happen at flush time.
The persist() method also guarantees that it will not execute an INSERT statement if it is called outside of transaction boundaries. This is useful in long-running conversations with an extended Session/persistence context.
The save() method does not guarantee the same, it returns an identifier, and if an INSERT has to be executed to get the identifier (e.g. "identity" generator, not "sequence"), this INSERT happens immediately, no matter if you are inside or outside of a transaction. This is not good in a long-running conversation with an extended Session/persistence context.
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