Hibernate：如何覆盖映射超类的属性

通用实体，超类：

@MappedSuperclass public abstract class GenericEntity { private Integer id; public Integer getId() {return id;} public void setId(Integer id) {this.id = id;} } 

pojo：

 @Entity @Table(name = "POJO_ONE") @SequenceGenerator(name = "HB_SEQ_POJO_ONE", sequenceName = "SEQ_POJO_ONE", allocationSize = 1) public class PojoOne extends GenericEntity { @Id @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "HB_SEQ_POJO_ONE") @Column(name = "ID") @AttributeOverride(name = "id", column = @Column(name = "ID")) private Integer id; @Override public Integer getId() {return id;} } 

我尝试使用thoms注释：@AttributeOverride，@ Id，…但它不起作用。 你可以帮我吗？ 我想覆盖属性“id”以通过pojo / table指定另一个列名和序列。 最好的方法是什么？

Answer 1

试试吧，相反

 @MappedSuperclass public abstract class GenericEntity { private Integer id; ... public Integer getId() {return id;} public void setId(Integer id) {this.id = id;} } @Entity @Table(name = "POJO_ONE") @SequenceGenerator(name = "HB_SEQ_POJO_ONE", sequenceName = "SEQ_POJO_ONE", allocationSize = 1) @AttributeOverride(name = "id", column = @Column(name = "ID")) public class PojoOne extends GenericEntity { // we should not define id here again ... @Override @Id @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "HB_SEQ_POJO_ONE") public Integer getId() {return id;} } 

Answer 2

你为什么不用@Id注释GenericEntity的id ？ 您也不应该重新定义id而是将@AttributeOverride(name = "id", column = @Column(name = "ID"))放在类而不是字段上。

编辑：

我们在我们的基类中使用它（ package.OurTableGenerator是我们自己的实现）：

 @GeneratedValue ( generator = "ourTableGenerator", strategy = GenerationType.TABLE ) @GenericGenerator ( name = "ourTableGenerator", strategy = "package.OurTableGenerator", parameters = { @Parameter ( name = OurTableGenerator.TABLE_PARAM, value = "t_sequence" ), @Parameter ( name = OurTableGenerator.SEGMENT_COLUMN_PARAM, value = "c_entity" ), @Parameter ( name = OurTableGenerator.VALUE_COLUMN_PARAM, value = "c_nextHi" ), @Parameter ( name = OurTableGenerator.INCREMENT_SIZE_COLUMN_PARAM, value = "c_blocksize" ) } ) @Id @Column(name = "c_uid") private Long uid; 

这让我们指定每个实体/表的差异块大小和序列。

对于您自己的表生成器，您可以org.hibernate.id.TableGenerator 。