如何从entitymanager
老去实体JPA?如何从JPA中的entitymanager获取旧实体?
代码:
Address address=em.find(Address.class,1); System.out.println("Name of Address: "+address.getAddressName); // China address.setAddressName("Russia"); Address address1=em.find(Address.class,address.getAddressId()); System.out.println("Name of Address: "+address1.getAddressName); //?????????
我怎样才能得到我的回答是 “中国制造”?