java - Java 扩展类的 Hibernate 注解映射

Question

我正在做一个 Spring Hibernate 项目，我有三个类BaseEntity、Person 和 Owner。

Person 扩展 BaseEntity，Owner 扩展 Person。

基础实体.java

public class BaseEntity {

    private Integer id;

        Getters & Setters 

人.java

public class Person extends BaseEntity {

    private String firstName;

    private String lastName;

       Getters & Setters 

所有者.java

@Entity
@Table(name="OWNERS")
public class Owner extends Person {

    @Column(name="ADDRESS")
    private String address;

    @Column(name="CITY")
    private String city;

    @Column(name="TELEPHONE")
    private String telephone;

    Getter and Setters

现在我想将三个类的所有属性映射到一个表中是 所有者。任何人都可以帮助我如何映射？

我有一个基于 xml 的映射，我想在注释中完成

<class name="org.springframework.samples.petclinic.Owner" table="owners">
        <id name="id" column="id">
            <generator class="identity"/>
        </id>
        <property name="firstName" column="first_name"/>
        <property name="lastName" column="last_name"/>
        <property name="address" column="address"/>
        <property name="city" column="city"/>
        <property name="telephone" column="telephone"/>
    </class>

我想过使用每个类继承映射表，但在 xml 中我看不到正在使用鉴别器列。

Answer 1

作为映射父类(super class)的具体类

使用@MappedSuperclass注释。

JPA (...) defines a mapped superclass concept defined though the @MappedSuperclass annotation or the element. A mapped superclass is not a persistent class, but allow common mappings to be define for its subclasses.

更多:Java Persistence/Inheritance

例子

@MappedSuperclass
public class BaseEntity {
    ...
}

@MappedSuperclass
public class Person extends BaseEntity {
   ...
}

@Entity
@Table(name="OWNERS")
public class Owner extends Person {
    ...
}

再看看这个问题:Hibernate : How override an attribute from mapped super class