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Here I’m referring to http://en.wikipedia.org/wiki/Merge_%28SQL%29
https://stackoverflow.com/a/8553030/304690 offers even a wider list of databases supporting MERGE SQL statement.
http://hibernate.org/docs do not seem to offer references to MERGE.
Is there some way to write entities or configure Hibernate for MERGE statements?
there is
session.merge()which does basicly the same using standard sql selects to determine if it is there or not. It has therefor 2 roundtrips but is supported across all sqldatabases.