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This article is about how Hibernate maps files. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Since JPA does not need to be configured, comments are already included in the code, so the Hibernate mapping file is attached below. in order to make the database clearer, the tables used by the two are not the same table. The table of JPA is prefixed with JPA, which is declared with @ Table.

The code to call JPA is as follows:

EntityManagerFactory emf = Persistence.createEntityManagerFactory ("TestSSH1PU2")

EntityManager em = emf.createEntityManager ()

Em.getTransaction () .begin ()

Com.hadeslee.jpaentity.Person p = new com.hadeslee.jpaentity.Person ()

P.setAge (26)

P.setName ("thousands of miles of ice")

Com.hadeslee.jpaentity.Department dept = em.find

(com.hadeslee.jpaentity.Department.class, Long.valueOf ("3"))

System.out.println ("dept= found" + dept)

Em.remove (dept)

Em.getTransaction () .commit ()

The code to call Hibernate is as follows:

Session session = HibernateUtil.getSessionFactory (). GetCurrentSession (); session.getTransaction (). Begin (); Department dept = (Department) session.load (Department.class, 2); session.delete (dept); session.getTransaction (). Commit ()

* it is found that JPA cannot be deleted, but the call on Hibernate can be deleted. At first, I thought it was the implementation of toplink, but later I deliberately changed the implementation to the implementation of Hibernate. So it is possible that JPA requires that it must be done, and that something can not be done automatically for us, which is good for safety. This may be the difference between standard and fashion.

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