I have the following relationships:
@OneToMany(fetch = FetchType.EAGER, mappedBy="note", cascade = CascadeType.REMOVE, orphanRemoval = true)
private Set<Review> reviews = new HashSet<>();
in Note.java and
@OneToMany(fetch = FetchType.EAGER, mappedBy = "expert", cascade = CascadeType.ALL, orphanRemoval = true)
private Set<Review> notes = new HashSet<>();
in Expert.java .
As you can see, they refer to the Review class, which represents a M to N relationship between Note and Expert. As I needed to add extra attributes to this relationship, I have created a ReviewId class and a Review class as follows:
@Embeddable
public class ReviewId implements Serializable {
@Column(name = "fk_note")
protected Long noteId;
@Column(name = "fk_expert")
protected Long expertId;
[...]
}
@Entity
public class Review {
@EmbeddedId
private ReviewId id;
private int value;
private String comment;
@ManyToOne
@JoinColumn(name = "fk_note", insertable = false, updatable = false)
private Note note;
@ManyToOne
@JoinColumn(name = "fk_expert", insertable = false, updatable = false)
private Expert expert;
[...]
}
When I try to delete a Note or an Expert that appear in this relationship, I get the following error:
Cannot delete or update a parent row: a foreign key constraint fails (`db_example`.`review`, CONSTRAINT `FKls65s9wl28v98ts2kifir37p7` FOREIGN KEY (`fk_note`) REFERENCES `note` (`id`))
How can I make Hibernate delete all Reviews related to a certain Note/Expert when I delete them? Thanks!
This can be done with FluentJPA :
long noteId; //passed as a parameter
FluentQuery query = FluentJPA.SQL((Review review) -> {
DELETE().FROM(review);
WHERE(review.getId().getNoteId() == noteId);
});
...
query.createQuery(em).executeUpdate();
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