jpa 작업하면서 복합키 사용한 예를 남겨본다.

CodeGroup

@Getter
@Setter
@Entity
@org.hibernate.annotations.Proxy(lazy = false)
@Table(name = "code_group")
public class CodeGroup implements Serializable {

    @Column(name = "ID", nullable = false, length = 100)
    @Id
    private String id;

    @Column(name = "NAME", nullable = false, length = 100)
    private String name;

    @Column(name = "DESCRIPTION", nullable = true, length = 500)
    private String description;

    @Column(name = "USE_YN", nullable = false, length = 1)
    private boolean useYn = true;

    @Column(name = "CREATED_TIME", nullable = false)
    private java.sql.Timestamp createdTime;

    @Column(name = "UPDATE_TIME", nullable = false)
    private java.sql.Timestamp updateTime;

    @Column(name = "DELETE_TIME", nullable = true)
    private java.sql.Timestamp deleteTime;

    @OrderBy("order asc")
    @JsonManagedReference
    @OneToMany(mappedBy = "group", targetEntity = Code.class)
    @org.hibernate.annotations.Cascade({org.hibernate.annotations.CascadeType.SAVE_UPDATE, org.hibernate.annotations.CascadeType.LOCK})
    @org.hibernate.annotations.LazyCollection(org.hibernate.annotations.LazyCollectionOption.TRUE)
    private java.util.Set<Code> code = new java.util.HashSet<Code>();

}

Code

@MapsId 로 groupId와 묶어준다

@Getter
@Setter
@Entity
@org.hibernate.annotations.Proxy(lazy = false)
@Table(name = "code")
@IdClass(CodePK.class)
public class Code implements Serializable {

    @Column(name = "ID", nullable = false, length = 100)
    @Id
    private String id;

    @Column(name = "NAME", nullable = false, length = 100)
    private String name;

    @Column(name = "DESCRIPTION", nullable = true, length = 500)
    private String description;

    @JsonBackReference
    @PrimaryKeyJoinColumn
    @MapsId("groupId")
    @ManyToOne(targetEntity = CodeGroup.class, fetch = FetchType.LAZY)
    @org.hibernate.annotations.Cascade({org.hibernate.annotations.CascadeType.LOCK})
    @JoinColumns(value = {@JoinColumn(name = "GROUP_ID", referencedColumnName = "ID", nullable = false)}, foreignKey = @ForeignKey(name = "fk_code_group_id_code_group_id"))
    private CodeGroup group;

    @Id
    @Column(name = "GROUP_ID", nullable = false, insertable = false, updatable = false)
    @GeneratedValue(generator = "CODE_GROUPID_GENERATOR")
    @org.hibernate.annotations.GenericGenerator(name = "CODE_GROUPID_GENERATOR", strategy = "foreign", parameters = @org.hibernate.annotations.Parameter(name = "property", value = "group"))
    private String groupId;


    @Column(name = "`ORDER`", nullable = false, length = 3, columnDefinition = "TINYINT(3)")
    private short order = 0;

    @Column(name = "USE_YN", nullable = false, length = 1)
    private boolean useYn = true;

    @Column(name = "CREATED_TIME", nullable = false)
    private java.sql.Timestamp createdTime;

    @Column(name = "UPDATE_TIME", nullable = false)
    private java.sql.Timestamp updateTime;

    @Column(name = "DELETE_TIME", nullable = true)
    private java.sql.Timestamp deleteTime;

    @PrePersist
    protected void onCreate() {
        createdTime = updateTime = new java.sql.Timestamp(System.currentTimeMillis());
    }


}

CodePK

@Getter
@Setter
@EqualsAndHashCode
@Embeddable
public class CodePK implements Serializable {
    private String id;
    private String groupId;
}

service

저장하기 전 상위 객체를 찾아서 할당해주자.

public Code save(Code code) {
    CodeGroup codeGroup = codeGroupRepository.findById(code.getGroupId()).orElseThrow(() -> new IllegalArgumentException("코드 그룹을 찾을 수 없습니다."));
    code.setGroup(codeGroup);
    return codeRepository.save(code);
}

Hibernate 복합키 인 경우 인서트 @IdClass @ManyToOne