Hibernate, insert or update without select

Question

I have a products objects which belongs to certain categories i.e. classical many to one relationship.

@Entity
public class Product{

    @Id
    @GeneratedValue         


        

Answer 1

I've just tried following:

Category category = new Category(categoryId);
product.setCategory(category);

And it worked, i mean product record in db got correct link to category and category with id

categoryId

haven't changed.