java - Hibernate 实体中的多个 SequenceGenerator

Question

是否可以在 Hibernate 实体类中使用 2 个序列生成器。我想在我的情况下使用两个序列生成器，一个用于主键，另一个用于简单字段。我怎样才能达到同样的效果？

@Data
@Table(name="a_b")
@SequenceGenerator(name = "a1_seq", sequenceName = "a1_seq", allocationSize    = 1)
@SequenceGenerator(name = "b1_seq", sequenceName = "b1_seq", allocationSize = 1)
public class ABC {

    @Id
    @Column(name = "id")
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "a1_seq")
    private Integer id;

    @Column(name = "c")
    private String c;

    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "b1")
    @Column(name = "b)
    private Integer b;

}

Answer 1

您应该只有一个主键 SequenceGenerator:

@Id
@Column(name = "id")
@SequenceGenerator(name = "a1_seq", sequenceName = "a1_seq", allocationSize    = 1)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "a1_seq")
private Integer id;

对于外键，您可以拥有:

@Column(name = "b, columnDefinition="serial")
private Integer b;

这应该适用于 PostgreSQL。