[hibernate] 복합키 설정

http://stackoverflow.com/questions/3585034/how-to-map-a-composite-key-with-hibernate

@ID 방식과 @Embeddable 방식이 있는데 후자의 방식으로 코딩했다.(이유는 @Id 방식으로 했을 때 에러가 나서?)

TagBusy의 PK 정보를 TagBusyId가 가지고 있다(3가지 복합키)

@Entity
@Table(name = "tag_busy")
public class TagBusy {
    @EmbeddedId
    private TagBusyId tagBusyId; //PK
    @Column(name = "reg_date", nullable = true, insertable = false, updatable = false)
    private Date regDate; //등록일시

    public TagBusyId getTagBusyId() {
        return tagBusyId;
    }

    public void setTagBusyId(TagBusyId tagBusyId) {
        this.tagBusyId = tagBusyId;
    }

    public Date getRegDate() {
        return regDate;
    }

    public void setRegDate(Date regDate) {
        this.regDate = regDate;
    }
}

@Embeddable
public class TagBusyId implements Serializable {
    @ManyToOne(optional = false)
    @JoinColumn(name = "tag_no", nullable = false)
    private Tag tag; //태그
    @Column(name = "cnts_no", nullable = false)
    private int cntsNo; //컨텐츠번호
    @Column(name = "cnts_type", nullable = false)
    private int cntsType; //컨텐츠타입

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        TagBusyId tagBusyId = (TagBusyId) o;

        if (cntsNo != tagBusyId.cntsNo) return false;
        if (cntsType != tagBusyId.cntsType) return false;
        if (tag != null ? !tag.equals(tagBusyId.tag) : tagBusyId.tag != null) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = tag != null ? tag.hashCode() : 0;
        result = 31 * result + cntsNo;
        result = 31 * result + cntsType;
        return result;
    }

    public Tag getTag() {
        return tag;
    }

    public void setTag(Tag tag) {
        this.tag = tag;
    }

    public int getCntsNo() {
        return cntsNo;
    }

    public void setCntsNo(int cntsNo) {
        this.cntsNo = cntsNo;
    }

    public int getCntsType() {
        return cntsType;
    }

    public void setCntsType(int cntsType) {
        this.cntsType = cntsType;
    }
}