Save entity and all its daughter entities

Question

I have problems with the updates of my entity Mdfe, before explaining what happens, I would like you to look at the image below, from it I can explain better.

We can verify that The Mdfe has a one-to-many relationship with Mdfedocumento, which also has a one-to-many relationship with Mdfeunidadetransport and this has a one-to-many relationship with Mdfeunidadecargo.

The CRUD of this structure is realized all over the Mdfe. When editing a document and updating the entity, the document is changed, however, from there, the other entities do not suffer the changes. For example: If when editing a Mdfe and changing the transport unit of a particular document, when updating the entity Mdfe, the transport unit does not undergo the change made.

How can I get these inserts/changes to be made only by saving Mdfe? If it is not possible to insert/update only the parent entity, which is the best way to insert/update the others?

Thank you all, and if you have any doubts in my explanation comment that I am improving.

Answer 1

Gilvan if you are using JPA is easy, just use the annotation

cascadeType.ALL

in the list of your entities. For example:

The Mdfe class probably has a list of Mdfedocumento, in this list put the annotation above.

public class MDFe{

   @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
   protected List<MDFeDocumento> userAddresses;

}

or on Fetchtype put Ager

public class MDFe{

   @OneToMany(fetch = FetchType.EAGER)
   protected List<MDFeDocumento> userAddresses;

}

So on, your Mdfedocumento class should have a list of Mdfeunidadetransport with this annotation and this extends as far as you want. When saving Mdfe all the rest will be saved.