不同嵌入式中的相同字段

Question

我有 3 个表 A、B、C：

@Embeddable
public class AModel {
    @Column(name = "a_id", insertable = false, updatable = false)
    private int id;
    @Column(name = "a_name")
    private String name;
}

@Embeddable
public class BModel {
    @Column(name = "b_id", insertable = false, updatable = false)
    private int id;
    private int aId;
    @Column(name = "b_name")
    private String name;
}

@Embeddable
public class CModel {
    @Column(name = "c_id", insertable = false, updatable = false)
    private int id;
    private int aId;
    @Column(name = "c_name")
    private String name;
}

我有不可变的实体

@Entity
@Immutable
public class AEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "a_id")
    private int id;

    @Embedded
    private AModel aModel;
    @Embedded
    private BModel bModel;
    @Embedded
    private CModel cModel;
}

我使用 EntityManager.createNativeQuery 和以下查询创建的：

select * from A natural join B natural join C;

但是我遇到了一个异常，原因是：

org.hibernate.DuplicateMappingException:  Table [aentity] contains physical column name [a_id] represented by different logical column names: [a_id], [aId]

更新：解决方案

给bModel和cModel添加如下注解可以解决这个问题：

@AttributeOverrides({
            @AttributeOverride(name = "aId", column = @Column(name = "a_id", insertable = false, updatable = false))
    })

Answer 1

您正在将@Id、@Column 与您的可嵌入class AModel 一起使用。如果您想将 AModel 作为复合键，则可以使用 @EmbeddedId。当您在 AEntity 中定义 @Column(name = a_id) 并且在可嵌入的 class AModel 中定义相同的东西时，问题就来了，因此得到重复的逻辑映射。

不同嵌入式中的相同字段

Same fields in different Embedded

java

hibernate

jpa

hibernate-mapping

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