java JPA：如何覆盖@Embedded 属性的列名
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JPA: how to override column names of @Embedded attributes
提问by Oleg Mikhailov
Personclass
Person班级
@Embeddable
public class Person {
@Column
public int code;
//...
}
is embedded inside Eventtwice as two different attributes: managerand operator
Event作为两个不同的属性被嵌入两次：manager和operator
@Entity
public class Event {
@Embedded
@Column(name = "manager_code")
public Person manager;
@Embedded
@Column(name = "operator_code")
public Person operator;
//...
}
This should give two respective columns when generating database schema with Persistence. Instead an exception is thrown:
使用持久性生成数据库模式时，这应该给出两个相应的列。而是抛出异常：
org.hibernate.MappingException: Repeated column in mapping for entity: Event column: code
org.hibernate.MappingException：实体映射中的重复列：事件列：代码
How to override default column name codefor each attribute?
如何覆盖code每个属性的默认列名？
回答by Predrag Maric
Use @AttributeOverride, here is an example
使用@AttributeOverride，这里是一个例子
@Embeddable public class Address {
protected String street;
protected String city;
protected String state;
@Embedded protected Zipcode zipcode;
}
@Embeddable public class Zipcode {
protected String zip;
protected String plusFour;
}
@Entity public class Customer {
@Id protected Integer id;
protected String name;
@AttributeOverrides({
@AttributeOverride(name="state",
column=@Column(name="ADDR_STATE")),
@AttributeOverride(name="zipcode.zip",
column=@Column(name="ADDR_ZIP"))
})
@Embedded protected Address address;
...
}
In your case it would look like this
在你的情况下，它看起来像这样
@Entity
public class Event {
@Embedded
@AttributeOverride(name="code", column=@Column(name="manager_code"))
public Person manager;
@Embedded
@AttributeOverride(name="code", column=@Column(name="operator_code"))
public Person operator;
//...
}
