JPA query for getting the whole tree

Question

I have a class which models all categories and they can be ordered hierarchically.

@Entity
@Table(name=\"categories\")
public class Category {
    @Id
    @G         


        

Answer 1

The short answer is; no there isn't a standard way to do this.

You have to use native sql.

You may be able to extend the Oracle Hibernate Dialect and add some user function/extension to get hibernate to generate PRIOR or CONNECT BY clauses, but this will prevent your app from being strict JPA and database independent.