Question

@Entity
@IdClass(MyPK.class)
public class SubEntity {
    @Id private int id;
    @Id private String name;
}

@Entity
public class ParentEntity {
    @OneToOne(cascade = ALL)
    @JoinColumn(name="fk_sub_id", foreignKey = @ForeignKey(name="fk_sub"))
    private SubEntity sub;
}

Caused by: org.hibernate.AnnotationException: A Foreign key refering SubEntity from ParentEntity has the wrong number of column. should be 2

由于@JoinColumn注释，此操作失败。但是我如何为复合PK写它呢？我必须使用此批注在hibernate自动生成期间设置foreignkey约束名称。

Answer 1

对于复合键，您应该使用@JoinColumns

@JoinColumns(value = {
    @JoinColumn(name = "fk_sub_id", referencedColumnName = "id"),
    @JoinColumn(name = "fk_name", referencedColumnName = "name")},
    foreignKey = @ForeignKey(name = "fk_sub"))

更新

在这种情况下，Hibernate似乎没有遵循JPA 2.1规范。您还需要另外包含hibernates自己的注释，该注释已弃用但仍然可以运行。这应该添加如下：

@JoinColumns(value = {
    @JoinColumn(name = "fk_sub_id", referencedColumnName = "id"),
    @JoinColumn(name = "fk_name", referencedColumnName = "name")},
    foreignKey = @ForeignKey(name = "fk_sub"))
@org.hibernate.annotations.ForeignKey(name = "fk_sub")

如何在使用@IdClass复合主键时命名@ForeignKey？

1 个答案: