使用共享id和cascade=all的JPA/Hibernate试图在父级之前保存子级，导致外键冲突

Question

我将JPA与Hibernate一起使用。我有一个1对1的父子关系（子是可选的），两者之间共享id，子表上有一个外键关系。我的实体如下所示：

public class LogItemEntity {
...

    @OneToOne(cascade={CascadeType.ALL}, mappedBy = "logItem", orphanRemoval=true, optional=true)
    @PrimaryKeyJoinColumn(referencedColumnName="ral_id")
    private LogAdditionalRequirement additionalRequirement;
...
}

public class LogAdditionalRequirement {
...
    @Id
    @GeneratedValue(generator = "foreign")
    @GenericGenerator(name = "foreign", strategy = "foreign", parameters = { @Parameter(name = "property", value = "logItem") })
    @Column(name = "ral_id")
    private Long id;

    @OneToOne(optional=false)
    @PrimaryKeyJoinColumn(referencedColumnName="id")
    private LogItemEntity logItem;
...
}

ERROR o.h.util.JDBCExceptionReporter - ERROR: insert or update on table "rar_log_additional_requirement" violates foreign key constraint "fk_rar_ral_id"
Detail: Key (ral_id)=(70150) is not present in table "ral_log".

Answer 1

一个解决方案是删除级联“cascade={cascadetype.all}”

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