ManyToOne associated Jpa / Hibernate non-primary key column delay loading failure

@ManyToOne configuration lazy loading, if the associated primary key column,

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "billid", insertable = false,updatable = false, nullable = false)
    private Bill bill ;

@Setter
@Getter
@Entity
@DynamicUpdate
@Table(name = "Bill")
public class Bill implements Serializable {

    /**
     * 主键
     */

    @Id
    @Column(name = "ID")
    private String id;

   @Column(name = "SID")
    private String sid;
}

Lazy loading is normal.

But if the associated Address sid is not the id, then it is a problem loading delay. The following code:

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "billid", referencedColumnName = "sid", insertable = false,updatable = false, nullable = false)
private Bill bill;

At this time of the solution, we need to understand the mechanisms of PersistentAttributeInterceptable.

@DynamicUpdate
@Entity
@Setter
@Getter
@Table ( name ="BillDETAIL" )
public class BillDetail implements PersistentAttributeInterceptable, Serializable {
    
    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "billid", referencedColumnName = "sid", insertable = false,updatable = false, nullable = false)
    @LazyToOne(LazyToOneOption.NO_PROXY)
    private Bill bill;

    public Bill getBill() {
        if (interceptor!=null) {
            return (Bill)interceptor.readObject(this, "bill", bill);
        }
        return bill;
    }

    public void setBill(BillView bill) {
        if (interceptor!=null) {
            this.billView = (Bill) interceptor.writeObject(this,"owner", this.bill,bill);
            return ;
        }
        this.bill = bill;
    }


    @Transient
       private PersistentAttributeInterceptor interceptor;

    @Override
    public PersistentAttributeInterceptor $$_hibernate_getInterceptor() {
        return interceptor;
    }

    @Override
    public void $$_hibernate_setInterceptor(PersistentAttributeInterceptor interceptor) {
        this.interceptor = interceptor;
    }


}

 

reference:

https://blog.csdn.net/johnf_nash/article/details/86557107     

https://blog.csdn.net/windsigirl123/article/details/60957632