[英]Composite ID and its generation in JPA
我想使用ID之類的自定義類
@javax.persistence.Embeddable
class ObjectID impements Serializable{
private Long value;
//setters, getters and other
}
這里是映射類
@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
}
不起作用 沒有產生價值。 有什么想法,如何生成Composite-id的ID?
ID類必須是可序列化的,並實現hashCode和equals
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