[英]Use the external key as part of primary key with Hibernate annotation
我與Car
和DatatableProgress
之間存在one-to-many
關系,因此一輛car
可能具有更多的DatatableProgress
但其中一個DatatableProgress
元素屬於一輛car
。 Car
將idCar
作為主鍵, datatableProgress
將datatableName
和sheet
作為主鍵,但是我必須添加idCar
(外鍵)作為主鍵的一部分。 我嘗試使用此代碼,但收到mappedBy reference an unknown target entity property: com.domain.DatatableProgress.car in com.domain.Car.datatablesProgress
。 我需要這個,因為我可以擁有一個具有相同名稱和表單但不同汽車的datatableProgress。 :
DatatableProgress:
@Entity
@Table(name = "datatableprogress")
public class DatatableProgress implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private DatatableProgressKeys datatableProgressKeys;
private Integer actualStoredRow;
@MapsId("car")
@JoinColumns({
@JoinColumn(name="idCar_fk", referencedColumnName="idCar"),
})
@ManyToOne(fetch = FetchType.LAZY)
private Car car;
public DatatableProgress() {
}
public DatatableProgress(DatatableProgressKeys datatableProgressKeys, Integer actualStoredRow) {
this.datatableProgressKeys = datatableProgressKeys;
this.actualStoredRow = actualStoredRow;
}
/**
* @return the datatableKeys
*/
@EmbeddedId
public DatatableProgressKeys getDatatableProgressKeys() {
return datatableProgressKeys;
}
/**
* @param datatableKeys the datatableKeys to set
*/
public void setDatatableProgressKeys(DatatableProgressKeys datatableProgressKeys) {
this.datatableProgressKeys = datatableProgressKeys;
}
@Column(name = "actualStoredRow", nullable = false)
public Integer getActualStoredRow() {
return this.actualStoredRow;
}
public void setActualStoredRow(Integer actualStoredRow) {
this.actualStoredRow = actualStoredRow;
}
}
DatatableProgressKey
@Embeddable
public class DatatableProgressKeys implements Serializable {
private static final long serialVersionUID = 1L;
private String datatableName;
private Integer sheet;
private Car car;
public DatatableProgressKeys() {}
public DatatableProgressKeys(String datatableName, Integer sheet, Car car) {
this.datatableName = datatableName;
this.sheet = sheet;
this.setCar(car);
}
@Column(name = "datatableName", nullable = false)
public String getDatatableName() {
return this.datatableName;
}
public void setDatatableName(String datatableName) {
this.datatableName = datatableName;
}
@Column(name = "sheet", nullable = false)
public Integer getSheet() {
return this.sheet;
}
public void setSheet(Integer sheet) {
this.sheet = sheet;
}
/**
* @return the car
*/
@Column(name = "id_car", nullable = false)
public Car getCar() {
return car;
}
/**
* @param car the car to set
*/
public void setCar(Car car) {
this.car = car;
}
//hashCode and equals
汽車
@Entity
@Table(name = "car")
public class Car implements java.io.Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private Integer idCar;
private Integer initialKm;
@JsonIgnore
private Set<DatatableProgress> datatablesProgress = new HashSet<DatatableProgress>(0);
public Car() {
}
public Car(Integer initialKm) {
this.initialKm = initialKm;
}
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "id_car", unique = true, nullable = false)
public Integer getIdCar() {
return this.idCar;
}
public void setIdCar(Integer idCar) {
this.idCar = idCar;
}
@Column(name = "initialKm", nullable = false)
public Integer getInitialKm() {
return this.initialKm;
}
public void setInitialKm(Integer initialKm) {
this.initialKm = initialKm;
}
@OneToMany(fetch = FetchType.LAZY, mappedBy = "car")
public Set<DatatableProgress> getDatatablesProgress() {
return this.datatablesProgress;
}
public void setDatatablesProgress(Set<DatatableProgress> datatablesProgress) {
this.datatablesProgress = datatablesProgress;
}
}
更新:是否可以在不修改Car實體的情況下(而不是CarKey類)進行更改?
要成為組合鍵實體的一部分,應@Embedable。 您可以僅使用一個Integer字段為Car類創建一個單獨的鍵實體,然后將該鍵類用於您的復合鍵。 看到那里的休眠文檔
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