David R. Heffelfinger

  Ensode Technology, LLC

 
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Common JPA Questions



  1. How can I have a composite primary key in JPA?

    There are several ways to do it, this page explains them.

  2. How can I prevent users from overwriting each other's changes to the database?

    Use the @Version annotation.

  3. Is there a way to do bulk updates and/or deletes with the Java Persistence Query Language (JPQL)?

    Yes.

 
 
 
 
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