Spring boot JPA - Custom Repository for multiple Entity - rest

Question

I've got some difficulties with my JPA Rest Project.
I have build my repositories for each of my entity (my tables in my database), and it works fine.
For example, a part of my entity "Personne" :
#Entity
public class Personne {
private Long id;
private String nom;
private String prenom;
private Date dateNaissance;
private String telDomicile;
private String telPortable;
private String telAutre;
private String telCommentaire;
private String fax;
private String mail;
private String commentaire;
private Timestamp dateSuppr;
private String sexe;
private Patient patientById;
private Adresse adresseByAdresseId;
#Id
#JsonProperty(value = "dataId")
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
}
And myRepository with a #Query :
#Transactional
#RepositoryRestResource(collectionResourceRel = "personne", path = "personne", excerptProjection = InlinePersonne.class)
public interface PersonneRepo extends JpaRepository<Personne, Long> {
#Query("from Personne p where p.nom = ?1 and p.prenom = ?2")
public Personne customRequest(String nom, String prenom);
}
My problem : the return result is always a type "Personne".
I would like to make a native request that sends me back an object, with customized properties.
Example of the wished return :
{object :
{name : String,
surname : String,
age : int },
adresse :{
city : String,
street : String
}
}
Is it possible to do that ?
I really need it because I have to make complex requests on many tables.
Thank you.

Answer 1

You could use interface-base projections:
First you create interfaces that reflect the fields you need:
interface PersonSummary {
String getName();
String getSurename();
int getAge();
AddressSummary getAddress();
interface AddressSummary {
String getCity();
String getStreet();
}
}
Then you indicate your custom query what interface it needs to extend and instantiate to populate the information:
public interface PersonneRepo extends JpaRepository<Personne, Long> {
// All your other abstract method
// Brand new query
#Query("Select p.name, p.surname, p.age, p.city, p.street from Personne p where p.nom = ?1 and p.prenom = ?2")
public PersonSummary customRequest(String nom, String prenom);
}
You would be receiving an object like this:
{
name : String,
surname : String,
age : int,
address :{
city : String,
street : String
}
}
You would need to test how flexible is this functionality in the terms of the composition complexity of the object you want to receive.