[英]Entity must be managed to call remove?
public Person deletePerson(Person entity) {
EntityManager ems = emf.createEntityManager();
try {
ems.getTransaction().begin();
ems.merge(entity);
ems.remove(entity);
ems.getTransaction().commit();
} finally {
ems.close();
}
return entity;
}
它不起作用,我不知道為什么? 給我java.lang.IllegalArgumentException
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