Licitatie实体:
@Entity
@Table(name="licitatie")
public class Licitatie implements Serializable {
...
//bi-directional one-to-one association to Licitatie
@OneToOne(mappedBy="licitatie")
private Produs produs;
...
}
Produs实体:
@Entity
@Table(name="produs")
//@DiscriminatorColumn(name="id", discriminatorType=DiscriminatorType.INTEGER)
@MappedSuperclass
public class Produs implements Serializable {
...
//bi-directional one-to-one association to Produs
@OneToOne
@JoinColumn(name="licitatie_id")
private Licitatie licitatie;
...
}
数据库:
Licitatie:
id start status
1 5 open
2 5 open
3 5 open
Produs:
id licitatie_id DTYPE description
1 1 Carte ...
2 2 Carte ...
3 3 Carte ...
运行tris查询后:“SELECT t FROM Licitatie t”,来自Licitatie类型的对象的属性Product为null。但是表格中有记录。
我做错了什么?
*编辑 *
从表中获取数据后,调用getProdus()会返回以下消息:
{IndirectSet:not instantiated}
答案 0 :(得分:0)
解决
我已将列PRODUS_ID添加到licitatie表。
Licitatie:id produs_id ...... Produs:id,licitatie_id ......