Hibernate Foreign Key exception

时间：2014-09-23 10:56:14 收藏：0 阅读：368

Exception：A Foreign key refering Province from City has the wrong number of column. should be 2

发生错误的类 City：

@Entity
@Table(name = "CITY")
@SuppressWarnings("serial")
public class City implements ICity,Serializable{
	@EmbeddedId
	private CityPK city_PK;
	
	@OneToMany(mappedBy = "city", cascade = CascadeType.MERGE, fetch = FetchType.LAZY)
	@Fetch(FetchMode.SUBSELECT)
	private Set<Area> areas;
	
	@ManyToOne
	@JoinColumn(name = "prov_Code")
	private Province province;	

　　　　Get/Set method...

}

原因：Province是联合主键，应该使用如下方式：

@ManyToOne
@JoinColumns({@JoinColumn(name = "prov_Code"),@JoinColumn(name = "prov_Name")})
private Province province;