@OneToOne and @JoinColumn, auto delete null entity , doable?
- by smallufo
I have two Entities , with the following JPA annotations :
@Entity
@Table(name = "Owner")
public class Owner implements Serializable
{
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "id")
private long id;
@OneToOne(fetch=FetchType.EAGER , cascade=CascadeType.ALL)
@JoinColumn(name="Data_id")
private Data Data;
}
@Entity
@Table(name = "Data")
public class Data implements Serializable
{
@Id
private long id;
}
Owner and Data has one-to-one mapping , the owning side is Owner.
The problem occurs when I execute : owner.setData(null) ; ownerDao.update(owner) ;
The "Owner" table's Data_id becomes null , that's correct.
But the "Data" row is not deleted automatically.
I have to write another DataDao , and another service layer to wrap the two actions ( ownerDao.update(owner) ; dataDao.delete(data); )
Is it possible to make a data row automatically deleted when the owning Owner set it to null ?
