Question

I am working with a project where I need to store a object in hibernate and it consist of many user defined objects. I know how use hibernate mapping with a object that only contain “ususal” types(int, String, etc…) but with custom types I’ve seen suggestions such as usage of the annotation @embedded and implementing UserType but I haven’t seen any suggestion on how to simply map the objects inside the object to a certain table. Note: these objects aren’t going in the same table, just in the same db. What I want to do is have a mapping that allows this function in my DaoImplementation:

public void store(MyObject o){
hibernateTemplate.saveOrUpdate(o);
}

This is soft of how my object looks:

public class MyObject{

private String name;

private ObjectA type;//Contains an int

private ObjectC look;//Contains a String.

private ObjectB[] children;//contains a string and other children.

public MyObject(){}

//Getters and setters omitted.

}

public class ObjectB{
private String name;
private ObjectB[] children;

public ObjectB(){}
//Getters setters omitted
}

Answer 1

If the contents of some object needs to be stored in a separate table, then this object should be another persistent entity, and you should use associations between entities : OneToMany, ManyToOne, OneToOne, ManyToMany, depending on the cardinalities.

Read the hibernate reference manual.