[英]Does Hibernate disallow read-only on @Column in embedded ID composite primary key classes (bug?)?
这是数据库设计(DDL):
CREATE TABLE Countries
(
iso_code CHAR(2) NOT NULL,
name VARCHAR(50) NOT NULL,
PRIMARY KEY (iso_code)
);
CREATE TABLE Zips
(
country_code CHAR(2) NOT NULL,
code VARCHAR(10) NOT NULL,
PRIMARY KEY (country_code, code),
FOREIGN KEY (country_code) REFERENCES Countries (iso_code)
);
这是Zip类+复合主键类:
@Entity
@Table(name = "Zips")
public class Zip implements Serializable
{
@EmbeddedId
private ZipId embeddedId;
@ManyToOne
@JoinColumn(name = "country_code", referencedColumnName = "iso_code")
private Country country = null;
...
}
@Embeddable
public class ZipId implements Serializable
{
@Column(name = "country_code", insertable = false, updatable = false)
private String countryCode;
@Column(name = "code")
private String code;
...
}
休眠堆栈跟踪:
Exception in thread "main" javax.persistence.PersistenceException: [PersistenceUnit: zips] Unable to build EntityManagerFactory
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:911)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:57)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:48)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:32)
at tld.zips.Main.main(Main.java:27)
Caused by: org.hibernate.MappingException: Repeated column in mapping for entity: tld.zips.model.Zip column: country_code (should be mapped with insert="false" update="false")
at org.hibernate.mapping.PersistentClass.checkColumnDuplication(PersistentClass.java:675)
at org.hibernate.mapping.PersistentClass.checkPropertyColumnDuplication(PersistentClass.java:697)
at org.hibernate.mapping.PersistentClass.checkColumnDuplication(PersistentClass.java:719)
at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:473)
at org.hibernate.mapping.RootClass.validate(RootClass.java:235)
at org.hibernate.cfg.Configuration.validate(Configuration.java:1332)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1835)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:902)
... 4 more
这是什么? country_code在组合主键类中映射为只读(可插入=假,可更新=假)。 这与EclipseLink完美配合! IIRC @Embeddable类在其列上允许@ Basic,@ Column,@ Enumerated,@ Temporal,@ Lob和@Embedded,因此应该可以使用。 请注意,该代码与JPA 1.0兼容。
将可插入= false,可更新= false放在@JoinColumn上时,异常消失了,但这不是我想要的。 我希望我的协会是可写的...
这是休眠错误吗? 我正在使用Hibernate 3.6稳定版。
是的,好像是个虫子。 无论如何,我想您可以这样做。 不过,我自己还没有尝试过。
@Entity
@Table(name = "Zips")
public class Zip implements Serializable
{
@EmbeddedId
@AttributeOverrides({
@AttributeOverride(name="countryCode", column=@Column(name="country_code", insertable = false, updatable = false))
@AttributeOverride(name="code", column=@Column("code"))
})
private ZipId embeddedId;
@ManyToOne
@JoinColumn(name = "country_code", referencedColumnName = "iso_code")
private Country country;
...
}
@Embeddable
public class ZipId implements Serializable
{
private String countryCode;
private String code;
...
}
看起来像个错误。 作为解决方法,您可以将country
放入ZipId
而不是countryCode
:
@Entity
@Table(name = "Zips")
public class Zip implements Serializable
{
@EmbeddedId
private ZipId embeddedId;
...
}
@Embeddable
public class ZipId implements Serializable
{
@ManyToOne
@JoinColumn(name = "country_code", referencedColumnName = "iso_code")
private Country country = null;
@Column(name = "code")
private String code;
...
}
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