@MappedSuperclass
public abstract class BillingDetails1 {
@Column(name = "OWNER", nullable = false)
private String owner;
}
现在映射具体的子类：
@Entity
@AttributeOverride(
name="owner",
column=@Column(
name = "CC_OWNER", nullable = false
)
)
public class CreditCard1 extends BillingDetails1 {
@Id
@GeneratedValue
@Column(name = "CREDIT_CARD_ID")
private Integer id;
@Column(name = "CC_NUMBER", nullable = false)
private String number;
@Column(name = "EXP_MONTH", nullable = false)
private String expMonth;
@Column(name = "EXP_YEAR", nullable = false)
private String expYear;
}
可以用@AttributeOverride注解在一个子类中覆盖来自超类的列映射。在CREDIT_CARD表中重新命名OWNER列为CC_OWNER。数据库标识符也可以在超类中声明，给所有的子类使用一个共用的列名和生成器策略。<mapped-superclass class="cn.jbit.hibernate.entity1.BillingDetails1" access="FIELD"> <attributes> <basic name="owner"> <column name="OWNER" nullable="false"/> </basic> </attributes> </mapped-superclass> <entity class="cn.jbit.hibernate.entity1.CreditCard1" access="FIELD"> <attribute-override name="owner"> <column name="CC_OWNER" nullable="false"/> </attribute-override> <attributes> <id name="id"> <column name="CREDIT_CARD_ID" nullable="false"/> <generated-value strategy="AUTO"/> </id> <basic name="number"> <column name="CC_NUMBER" nullable="false"/> </basic> <basic name="expMonth"> <column name="EXP_MONTH" nullable="false"/> </basic> <basic name="expYear"> <column name="EXP_YEAR" nullable="false"/> </basic> </attributes> </entity>说明：（组件是值类型）可以把子类映射为组件，通过所超类（或者接口）的所有属性都包括在组件映射中。有了注解，可以在正映射的可嵌入组件的超类上使用@MappedSuperclass注解，就像对实体使用时一样。注意该特性仅在Hibernate Annotations中可用，不是标准的或者可移植的。
Hibernate实战_笔记27（每个带有隐式多态的具体类一张表）,布布扣,bubuko.com
Hibernate实战_笔记27（每个带有隐式多态的具体类一张表）
原文：http://blog.csdn.net/com185272358/article/details/22331385