JPA，Spring映射多个实体

Question

我有 3 个表格顾问、病人和诊断。 Diagnosis 具有 Consultant 和 Patient 的属性作为外键。 我想知道如何在春天展示这个。 到目前为止我所拥有的是Consultant.java

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

Diagnosis.java

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;

Patient.java

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

请问这是怎么回事？ 我正在使用 postgresql。

Answer 1

如果您有 2 个实体，为什么要注释一个字段？ 每个关系都应该正确注释：

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

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