在JPA中更新一对一关系

Question

Hello i got the following entity class Book: $

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int id;

@OneToOne(cascade=CascadeType.PERSIST)
private BookProfile bookProfile;

@OneToMany(cascade=CascadeType.PERSIST , orphanRemoval=true, fetch=FetchType.EAGER)
private List<Rating> ratings;

$

i try to add a Profile like this:

$

Book book = manager.find(Book.class, bId);
BookProfile bookProfile = new BookProfile();
manager.getTransaction().begin();
book.setBookProfile(bookProfile);
manager.merge(book);
manager.getTransaction().commit();

$

But nothing happens the profile in Book is still null. What am i doing wrong ?

Answer 1

您需要将MERGE添加到bookProfile字段的级联类型。