Hibernate Foreign Key exception
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;
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