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JPA 어노테이션과 하이버 네이트를 사용하여 다 대다 관계를 구성하는 방법을 알아 내려고했지만, 많은 기사와 포럼 토론을 읽었지만, 오류.애트리뷰트를 가진 Many to Many 관계
내가 두 테이블 EQUIPEMENTS 및 Maintenance_Companies과의 관계 배상
이 속성을 가진 많은 관계로 많은 구성 :
내가 알고 싶어 우선은 어떻게 관계에 대한 엔티티를 추가하고 다른 일부에서는 @OneToMany를 만듭니다. 이렇게 구성된 기본 키에 문제가있어서 Collection 접근 방식을 사용했지만 예외가 있습니다. :
org.hibernate.MappingException: Repeated column in mapping for collection: mmapp.domain.Equipement.reparations column: EQUIPEMENT_FK
EQUIPEMENT :
@Entity
@Table(name = "EQUIPEMENTS")
public class Equipement implements Serializable{
private int id ;
private String marque ;
private int isbn ;
private Date purchaseDate ;
private double price ;
private int warrantyPeriod ;
public Equipement(){
}
public Equipement(String marque) {
this.marque = marque ;
}
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "EQUIPEMENT_ID")
public int getId(){
return this.id ;
}
public void setId(int id){
this.id = id ;
}
@Column(name = "EQUIPEMENT_MARQUE")
public String getMarque(){
return this.marque ;
}
public void setMarque(String marque){
this.marque = marque ;
}
@Column(name = "EQUIPEMENT_PUR_DATE")
public Date getPurchaseDate(){
return this.purchaseDate ;
}
public void setPurchaseDate(Date purchaseDate){
this.purchaseDate = purchaseDate ;
}
@Column(name = "EQUIPEMENT_PRICE")
public double getPrice(){
return this.price ;
}
public void setPrice(double price){
this.price = price ;
}
@ElementCollection
@JoinTable(
name= "EQUIPEMENT_MAINTENANCE_COMPANY" ,
[email protected](name= "EQUIPEMENT_FK"))
public Collection<Reparation> getReparations() {
return reparations ;
}
public void setReparations(Collection<Reparation> reparations) {
this.reparations = reparations ;
}
private Collection<Reparation> reparations ;
}
유지 관리 회사 :
이@Entity
@Table(name = "MAINTENANCE_COMPANIES")
public class MaintenanceCompany implements Serializable{
private int id ;
private String name ;
private String adress ;
private String telephone ;
public MaintenanceCompany(){}
public MaintenanceCompany(String name) {
this.name = name ;
}
public void setId(int id){
this.id = id ;
}
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
public int getId(){
return this.id ;
}
public void setName(String name){
this.name = name ;
}
public String getName(){
return this.name ;
}
public void setAdress(String adress){
this.adress = adress ;
}
public String getAdress(){
return this.adress ;
}
public void setTelephone(String telephone){
this.telephone = telephone ;
}
public String getTelephone(){
return this.telephone ;
}
@ElementCollection
@JoinTable(
name= "EQUIPEMENT_MAINTENANCE_COMPANY" ,
[email protected](name= "COMPANY_FK"))
public Collection<Reparation> getReparations(){
return reparations ;
}
public void setReparations(Collection<Reparation> reparations){
this.reparations = reparations ;
}
private Collection<Reparation> reparations ;
}
배상이
@Embeddable
public class Reparation implements Serializable{
private int delay ;
private double price ;
private Date date ;
public Reparation() {}
public Reparation(int delay, double price, Date date) {
this.delay = delay ;
this.price = price ;
this.date = date ;
}
public int getDelay() {
return delay ;
}
public void setDelay(int delay) {
this.delay = delay ;
}
public double getPrice() {
return price ;
}
public void setPrice(double price) {
this.price = price ;
}
public Date getDate() {
return date ;
}
public void setDate(Date date) {
this.date = date ;
}
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "EQUIPEMENT_FK")
public Equipement getEquipementRepared(){
return equipementRepared ;
}
public void setEquipementRepared(Equipement equipementRepared) {
this.equipementRepared = equipementRepared ;
}
private Equipement equipementRepared ;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "COMPANY_FK")
public MaintenanceCompany getMaintenanceCompany() {
return maintenanceCompany ;
}
public void setMaintenanceCompany(MaintenanceCompany maintenanceCompany) {
this.maintenanceCompany = maintenanceCompany ;
}
private MaintenanceCompany maintenanceCompany ;
}