Hibernate does insert instead of update when i am using merge

Question

I am trying to make an update on database using Hibernate. When i call merge, it results a new row in database. I don't receive any error. The cod is working, but i want update not insert.

Model:

@Entity
@Table(name = "Books")
public class Manual implements Serializable {
    @Id
    @GeneratedValue
    private int idManual;
    private String denumire;
    private String disciplina;
    private Date dataPostare;

    @Enumerated(EnumType.STRING)
    private TipManual tipManual;


    private String emailContact;
    private String telefonContact;
    private double pret;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "username")
    private User userName;

    public Manual() {

    }

    public Manual(int idManual, String denumire, String disciplina, Date dataPostare, TipManual tipManual,
            String emailContact, String telefonContact, double pret, User userName) {
        super();
        this.idManual = idManual;
        this.denumire = denumire;
        this.disciplina = disciplina;
        this.dataPostare = dataPostare;
        this.tipManual = tipManual;
        this.emailContact = emailContact;
        this.telefonContact = telefonContact;
        this.pret = pret;
        this.userName=userName;
    }

    public int getIdManual() {
        return idManual;
    }

    public void setIdManual(int idManual) {
        this.idManual = idManual;
    }

    public String getDenumire() {
        return denumire;
    }

    public void setDenumire(String denumire) {
        this.denumire = denumire;
    }

This is my model class, i also tried to remove @GeneratedValue for my id, but the problem is the same.

My function for merge:

@Override
    @Transactional
    public Manual updateBook(Manual book) {
        em.merge(book);
        em.flush();
        return book;
    }

Is there value in idManual of Manual entity when application calls updateBook ? — Ady Junior
– Ady Junior, Commented Jun 12, 2017 at 2:31
You are welcome @S.over17. If I Answer, do you mark my Answer as correct? — Ady Junior
– Ady Junior, Commented Jun 12, 2017 at 13:21

Ady Junior · Accepted Answer · 2017-06-12 15:32:29Z

1

Is there value in idManual of Manual entity when application calls updateBook?

Check this, because if identifier isn't present, the entity will be inserted again.

answered Jun 12, 2017 at 15:32

Ady Junior

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Comments

Khalil M · Accepted Answer · 2017-06-12 02:32:55Z

0

if your entity is detached entity that's will happend , more info

answered Jun 12, 2017 at 2:32

Khalil M

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