updating multiple rows using JPA

Question

I want to update all fields of a table that has value of colum NAME as \'PCNAME\'. The table name which i want to update is XYZ.I want to update only some fields and not kee

Answer 1

seanizer's answer is correct (+1) and a bulk update would be indeed nice for this use case. But you must take some precautions with bulk update operations. To paraphrase the JPA specification:

• bulk updates bypass optimistic locking checks (so you must manually increment the version column and/or manually validate the version column if desired)
• the persistence context is not synced with the result of bulk operations (so bulk operations should be performed in a separate transaction or at the very beginning of a transaction, before loading the state of any entity that might be affected).

My suggestion would thus be to at least increment the version column to avoid concurrency problem with other threads:

UPDATE XYZ xyz
SET xyz.name = :newname, xyz.version = xyz.version + 1 

And to perform it in a separate transaction or before loading any XYZ as previously explained.

References

• JPA 1.0 specification
  • Section 4.10 "Bulk Update and Delete Operations"