代我想使用自定义的类象ID复合ID及其在JPA
@javax.persistence.Embeddable
class ObjectID impements Serializable{
private Long value;
//setters, getters and other
}
这里被映射类
@Entity
@IdClass(ObjectID.class)
public class Country implements Serializable
{
@Id
@AttributeOverride(name = "value", column = @Column(name = "id"))
@SequenceGenerator(name = "CountrySequenceGenerator",
sequenceName = "lab_country_seq")
@GeneratedValue(strategy = GenerationType.SEQUENCE,
generator = "CountryCountryGenerator")
private ObjectID value;
// setters, getters, fields
}
不工作。没有产生价值。任何想法,我怎样才能生成复合ID的ID?
什么是CountryCountryGenerator? – wallenborn 2012-03-09 15:38:54
“复合ID”与单个字段?这个组合怎么样?复合id有多个字段 – DataNucleus 2012-03-09 16:35:20