在不同的会话中取消删除收藏集

Question

Consider the case given below.

class Person{
@Id
String name;
@OneToMany
List<Address> addresses;
}

Suppose in a session I create a person and one address value and save, and in a different session I do a load and when I persist I will add some addresses and I do not want the first address saved to be deleted then what should I do?

Example:

Session session1 =  sf.getCurrentSession();
session1.save(person);//person here has an address diff from below
session1.close();
Session session2 =  sf.getCurrentSession();
Person p1=session2.load(person,"Name");
List persA=new Arraylist<Address>();persA.add(new Address(...));
p1.setAddress(persA);
session.merge(p1);
session2.close();//this code is not exact I want to just project concept from here

So I want both the addresses to remain in the db and when I eagerly load thru spring data i should get both the addresses! how can i get this behavior?

Thanks all!

Answer 1

Well you are overwriting the address list by creating the new one. once you load the Person do the following:

List persA = p1.getAdress(); //get the existing address associated to the person.
persA.add(new Address()); //add new address to the existing list.