如何從entitymanager
老去實體JPA?如何從JPA中的entitymanager獲取舊實體?
代碼:
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); //?????????
我怎樣才能得到我的回答是 「中國製造」?