我有一张表,其中有两个外键,分别指向两个不同的表,这两个外键都共用一个列:
CREATE TABLE ZipAreas
(
country_code CHAR(2) NOT NULL,
zip_code VARCHAR(10) NOT NULL,
state_code VARCHAR(5) NOT NULL,
city_name VARCHAR(100) NOT NULL,
PRIMARY KEY (country_code, zip_code, state_code, city_name),
FOREIGN KEY (country_code, zip_code) REFERENCES Zips (country_code, code),
FOREIGN KEY (country_code, state_code, city_name) REFERENCES Cities (country_code, state_code, name)
)
正如您所看到的,有两个外键共享country_code(巧合地引用了引用路径末尾相同的列)。 实体类如下(JPA 1.0 @IdClass):
@Entity
@Table(name = "ZipAreas")
@IdClass(value = ZipAreaId.class)
public class ZipArea implements Serializable
{
@Id
@Column(name = "country_code", insertable = false, updatable = false)
private String countryCode;
@Id
@Column(name = "zip_code", insertable = false, updatable = false)
private String zipCode;
@Id
@Column(name = "state_code", insertable = false, updatable = false)
private String stateCode;
@Id
@Column(name = "city_name", insertable = false, updatable = false)
private String cityName;
@ManyToOne
@JoinColumns(value = {@JoinColumn(name = "country_code", referencedColumnName = "country_code"), @JoinColumn(name = "zip_code", referencedColumnName = "code")})
private Zip zip = null;
@ManyToOne
@JoinColumns(value = {@JoinColumn(name = "country_code", referencedColumnName = "country_code", insertable = false, updatable = false), @JoinColumn(name = "state_code", referencedColumnName = "state_code"), @JoinColumn(name = "city_name", referencedColumnName = "name")})
private City city = null;
...
}
如您所见,我将countryCode属性和city的country_code @JoinColumn标记为只读(insertable = false,updatable = false)。 但是,Hibernate出现了以下错误:
Exception in thread "main" javax.persistence.PersistenceException: [PersistenceUnit: geoinfo] Unable to configure EntityManagerFactory
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:374)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:48)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:32)
at tld.geoinfo.Main.main(Main.java:27)
Caused by: org.hibernate.AnnotationException: Mixing insertable and non insertable columns in a property is not allowed: tld.geoinfo.model.ZipAreacity
at org.hibernate.cfg.Ejb3Column.checkPropertyConsistency(Ejb3Column.java:563)
at org.hibernate.cfg.AnnotationBinder.bindManyToOne(AnnotationBinder.java:2703)
at org.hibernate.cfg.AnnotationBinder.processElementAnnotations(AnnotationBinder.java:1600)
at org.hibernate.cfg.AnnotationBinder.processIdPropertiesIfNotAlready(AnnotationBinder.java:796)
at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:707)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:3977)
at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3931)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1368)
at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1345)
at org.hibernate.ejb.Ejb3Configuration.buildMappings(Ejb3Configuration.java:1477)
at org.hibernate.ejb.EventListenerConfigurator.configure(EventListenerConfigurator.java:193)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:1096)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:278)
at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:362)
... 4 more
在我看来,这似乎相当基础。 "在属性中混合可插入和不可插入的列是不允许的",这个理由太弱了,不是吗?
Hibernate应该能够处理这个问题,例如根据JPA规范吗?这是一个bug吗?