只是一个简单的问题,但是这段代码中需要刷新吗？请注意,这将在JPA事务中.
User user = new User();
em.persist(user);
em.flush;
User aUser = em.find(User.class,user.getId());
assert(user.equals(aUser));
或者没有冲洗它会工作吗？
User user = new User();
em.persist(user);
User aUser = em.find(User.class,user.getId());
assert(user.equals(aUser));
或者相同的问题,但更多涉及的例子:
User user = em.find(User.class,id);
user.setName("My Name");
em.merge(user);
em.flush; //Is this line needed?
User aUser = em.createQuery("select u from User where u.name = 'My Name');
assert(user.equals(aUser));