Java 父子关系实现

我正在尝试实现以下内容

1个约会可以有0到多个子约会

子任命有1个家长任命

以下是我尝试过的：

private Appointment parentAppointment;

@ManyToMany(cascade = CascadeType.ALL )
private List<Appointment> childrenAppointments;

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编辑2：

固定人：

    @ManyToOne
@JoinColumn(name = "parent_appointment")
private Appointment parentAppointment;

@OneToMany( mappedBy="parentAppointment", cascade = CascadeType.ALL)
private List<Appointment> childrenAppointments;

---

如果没有更多的细节说明什么是不起作用的，我也无法提供多少帮助。如果我用标准关系来做这件事，正确的注释是：

@ManyToOne
private Appointment parentAppointment;

@OneToMany(cascade = CascadeType.ALL, mappedBy="parentAppointment")
private List<Appointment> childrenAppointments;

@ManyToOne
私人预约；
@OneToMany（cascade=CascadeType.ALL，mappedBy=“parentAppointment”）
私人名单儿童用药；

由于子任命只有一位家长，这将是一对多，而不是多对多。在数据库中，上述设置将在约会表上为父约会创建一列。对于没有父项的约会，此列可以为null

    @ManyToOne
@JoinColumn(name = "parent_appointment")
private Appointment parentAppointment;

@OneToMany( mappedBy="parentAppointment", cascade = CascadeType.ALL)
private List<Appointment> childrenAppointments;

    public void setParentAppointment(Appointment ap){
    this.parentAppointment = ap;
}
public void addChildAppointment(Appointment ap){
    this.childrenAppointments.add(ap);
}

@ManyToOne
private Appointment parentAppointment;

@OneToMany(cascade = CascadeType.ALL, mappedBy="parentAppointment")
private List<Appointment> childrenAppointments;