在具有相似 ID 的 Spring Boot 中加入两个没有外键的表

Question

这里有两张桌子；两者都有 ID 作为主键。我想知道如何根据它们的 ID 在没有外键的情况下加入这些表。服务实现应该是什么，存储库中应该有什么？ @Query和JOINS怎么写？

@Entity
@Table(name = "procedures")
@JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
public class Procedure implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ProcedureId")
    private int id;

    @Column(name = "ProcedureName")
    private String name;
    @Column(name = "ProcedureCode")
    private String code;

    @Column(name = "ProcedureDesc")
    private String desc;
//  getters and setters
}

@Entity
@Table(name = "cliniciandescriptor")
public class CPTClinicianDescriptor {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "Id")
    private int id;

    @Column(name = "ConceptId")
    private int conceptId;

    @Column(name = "CPTCode")
    private String cptCode;

    @Column(name = "ClinicianDescriptorId")
    private int clinicianDescriptorId;


    @Column(name = "ClinicianDescriptor")
    private String clinicianDescriptor;
//  getters and setters
}

Answer 1

您可以像在 SQL 中一样使用 JOIN 语法

例如

select p from Procedure p join CPTClinicianDescriptor c on c.id = p.id;

在此处阅读有关该主题的更多信息： https://72.services/how-to-join-two-entities-without-mapped-relationship/

Answer 2

考虑到它是一对一的关系，你可以使用这样的东西。

@Entity
@Table(name = "procedures")
@JsonIgnoreProperties({ "hibernateLazyInitializer", "handler" })
public class Procedure implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "ProcedureId")
    private int id;

    @Column(name = "ProcedureName")
    private String name;
    @Column(name = "ProcedureCode")
    private String code;

    @OneToOne(optional = false)
    @JoinColumn(name = "id", updatable = false, insertable = false)
    private CPTClinicianDescriptor  descriptor;

    @Column(name = "ProcedureDesc")
    private String desc;
//  getters and setters
}