JPA，Spring映射多个实体答案

【问题标题】：JPA , Spring Mapping multiple entitiesJPA，Spring映射多个实体
【发布时间】：2019-12-01 13:25:16
【问题描述】：

我有 3 张表格顾问、患者和诊断。诊断具有顾问和患者的属性作为外键。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。

【问题讨论】：

标签： java spring postgresql spring-boot hibernate-mapping

【解决方案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;

【讨论】：