Hibernate Component keys

最新推荐文章于 2025-12-21 21:47:42 发布

转载最新推荐文章于 2025-12-21 21:47:42 发布 · 85 阅读

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原文链接：http://www.cnblogs.com/fifi043/p/4906113.html

文章标签：

#java

本文探讨了在数据库中如何以嵌入式组件的方式存储夫妻关系，通过使用Husband和Wife类来实现夫妻关系的单一表存储，并详细解释了XML映射配置。

Wife is a component of Husband class and thus they are stored in one table in DB.

1.Annotation

Husband: put @Embedded before component Wife.

Only need one <mapping class="xxxx.xxx.xxx.Husband"> since wife is part of husband's table

@Entity
public class Husband {
        private int id;
        private String name;
        private Wife wife;
        
        @Id
        @GeneratedValue
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        
        @Embedded
        public Wife getWife() {
            return wife;
        }
        public void setWife(Wife wife) {
            this.wife = wife;
        }
        
        
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
}

public class Wife {
    private String wifeName;
    private int age;

    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }

    public String getWifeName() {
        return wifeName;
    }
    public void setWifeName(String name) {
        wifeName = name;
    }
}

2.XML

Only Husband needs xml.

<hibernate-mapping package="com.hibernate.model">
<class name="Husband">
   <id name="id"></id>
    <property name="name"></property>
    <component name="wife" >
       <property name ="wifeName"></property>
       <property name ="age"></property>
   </component>
</class>

转载于:https://www.cnblogs.com/fifi043/p/4906113.html