JPA 2 - 仅包含复合主键中的一个字段的外键？
我在使用JPA 2 / Hibernate中的复合主键和外键时遇到问题。我正在尝试用国家和省份创建一个简单的场景：
国家实体：
@Entity
@Table(name = "country")
public class Country extends DomainObjectBase implements Serializable {
@Id
@Basic(optional = false)
@Column(name = "code")
private String code;
@Basic(optional = false)
@Column(name = "name")
private String name;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "country")
private List<Province> provinces;
}
@Embeddable
public class ProvincePK implements Serializable {
@Basic(optional = false)
@Column(name = "code")
private String code;
@Basic(optional = false)
@Column(name = "country_code")
private String countryCode;
}
@Entity
@Table(name = "province")
public class Province extends DomainObjectBase implements Serializable {
@EmbeddedId
protected ProvincePK provincePK;
@Basic(optional = false)
@Column(name = "name")
private String name;
@MapsId("country_code")
@JoinColumn(name = "country_code", referencedColumnName = "code", insertable = false, updatable = false)
@ManyToOne(optional = false)
private Country country;
}
没有找到相关结果
已邀请:
2 个回复
殿虫
@Entity @Table(name = "province") @IdClass(ProvincePK.class) public class Province extends DomainObjectBase implements Serializable { @Id @Basic(optional = false) @Column(name = "code") private String code; @Id @Basic(optional = false, insertable = false, updatable = false) @Column(name = "country_code") private String countryCode; @Basic(optional = false) @Column(name = "name") private String name; @JoinColumn(name = "country_code", referencedColumnName = "code") @ManyToOne private Country country; }阀傻
参数必须与类中的属性名称匹配。应标记为，然后才有效。这是代码 -@Entity @Table(name = "province") public class Province implements Serializable { @EmbeddedId protected ProvincePK provincePK; @Basic(optional = false) @Column(name = "name") private String name; @MapsId(value = "country_code") @JoinColumn(name = "country_code", referencedColumnName = "code") @ManyToOne(optional = false) private Country country; } @Embeddable public class ProvincePK implements Serializable { @Basic(optional = false) @Column(name = "code") private String code; @Basic(optional = false) @Column(name = "country_code") private String country_code; } @Entity @Table(name = "country") public class Country implements Serializable { @Id @Basic(optional = false) @Column(name = "code") private String code; @Basic(optional = false) @Column(name = "name") private String name; @OneToMany(cascade = CascadeType.ALL, mappedBy = "country") private List<Province> provinces; }