java - Hibernate级联多层

Question

假设我们有以下医疗状况:

3个实体:咨询，带有一个可为空的处方。包含一套药物的处方。

我将它们建模如下:(Java 代码删除了不必要的信息)

Consultation {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @OneToOne(cascade = CascadeType.ALL, mappedBy = "consultation")
    @JoinColumn(name = "prescription_id")
    private Prescription prescription;
}

Prescription {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @OneToOne
    @JoinColumn(name = "consultation_id")
    private Consultation consultation;

    @OneToMany(cascade = CascadeType.ALL, mappedBy = "prescription")
    private Set<Medicine> medicines;
}


Medicine {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @ManyToOne
    @JoinColumn(name = "prescription_id")
    private Prescription prescription;
}

问题:

当我调用entityManager.persist(consultation)时，所有子实体都以级联形式保存:处方和​​药物组，在各自的表中。问题是所有外键值都为空。

1. consultation.prescription_id = null
2. prescription.consultation_id = null
3. medicine.prescription_id = null

Hibernate HQL 日志:

insert into PRESCRIPTIONS (consultation_id, prescription_type) values (?, ?)
insert into MEDICINES (description, name, prescription_id) values (?, ?, ?)
insert into CONSULTATIONS (cost, date_occured, description, diagnosis, employee_id, patient_id, reference_id) values (?, ?, ?, ?, ?, ?, ?)

我对级联机制有什么误解？

Answer 1

您似乎没有更新关联的所有者方；当将关联刷新到数据库时，Hibernate 不会检查反面。

确保正确更新处方中的咨询字段和医学中的处方字段。

级联与关联的归属无关；它只是确定哪个实体生命周期操作被级联到关联实体。