[ACCEPTED]-How to implement update () method in DAO using EntityManager (JPA)?-entitymanager
Accepted answer
According to the JPA specifications, EntityManager#merge() will 6 return a reference to another object than the one 5 passed in when the object was already loaded 4 in the current context. So, I'd rather return 3 the result of the merge() and write the update() method 2 like this:
@PersistenceContext
private EntityManager em;
public User update (User transientUser) {
return em.merge(transientUser);
}
Then, use it like this (skipping 1 the initialization part):
user.setPhone("YYYYYY");
user = dao.update(user);
change the property and then use EntityManager 1 merge()
http://java.sun.com/javaee/5/docs/api/javax/persistence/EntityManager.html#merge%28T%29
Source:
stackoverflow.com
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