NHibernate: SaveOrUpdate by <natural-id>

Is there an easy way to make NH INSERT or UPDATE an entity depending on whether there is already an enti开发者_StackOverflow中文版ty with same <natural-id />?

The entity is mapped to another (root) one using <many-to-one cascade="save-update" />.

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Not automatically. You will have to read from the database to see if a record for that natural-id already exists and then determine if you need to do an insert or update. Which of course means that the cascade won't work.

I was looking for something similar in How do I Insert or Update (or overwrite) a record using NHibernate?