Java JPA，Spring映射多个实体

我有三张表：顾问、患者和诊断。诊断具有顾问和患者作为外键的属性。我想知道如何在春天展示这个。到目前为止，我得到的是，

Consultant.java

   private String name;
   private String pos;
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "consultant")
    private List<Diagnosis> diagnosis;

public class Request {
    private String token;
    private String comment;
    private boolean status;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "Patient_id")
    @JoinColumn(name = "Consultant_id") //not sure about this syntax
    private Consultant consultant;
    private Patient patient;

 private String name;
   private int pid;
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "patient")
    private List<Diagnosis> diagnosis;

Patient.java

   private String name;
   private String pos;
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "consultant")
    private List<Diagnosis> diagnosis;

public class Request {
    private String token;
    private String comment;
    private boolean status;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "Patient_id")
    @JoinColumn(name = "Consultant_id") //not sure about this syntax
    private Consultant consultant;
    private Patient patient;

 private String name;
   private int pid;
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "patient")
    private List<Diagnosis> diagnosis;

私有字符串名称；
私有int-pid；
@OneToMany（fetch=FetchType.LAZY，mappedBy=“patient”）
私有列表诊断；

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请问这是怎么回事？我正在使用postgresql。

如果有两个实体，为什么要注释一个字段？每个关系都应适当标注：

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "Patient_id")
private Patient patient;

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "Consultant_id")
private Consultant consultant;

---

如果有两个实体，为什么要注释一个字段？每个关系都应适当标注：

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "Patient_id")
private Patient patient;

@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "Consultant_id")
private Consultant consultant;