组件映射

Husband 中 有一个 Wife 属性，数据库不生成Wife表，仅将Wife的所有字段都加到Husband表中。

　　Annotation 配置：

　　　　如果 Husband 类的属性比如 husband 的 name 属性和 wife 的name属性冲突，有两种解决方案：

　　　　　　1、将 wife的name属性改为 wifeName；

　　　　　　2、通过 @AttributeOverrides 自己一个一个对wife的属性进行设置就可以了，如下：

　　@Embedded
    @AttributeOverrides(value = { 
            @AttributeOverride(name="wifeName", column=@Column(name="wifName2")),//别名
            @AttributeOverride(name="age", column=@Column(name="wifeAge"))
    })
    public Wife getWife() {
        return wife;
    }

Husband 类：

package com.bjsxt.hibernate;

import javax.persistence.Embedded;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class Husband {
    
    private Integer id;
    
    private String name;

    private Wife wife;
    
    @Id
    @GeneratedValue
    public Integer getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    @Embedded
    public Wife getWife() {
        return wife;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setWife(Wife wife) {
        this.wife = wife;
    }
}

　　　　Wife 类：

package com.bjsxt.hibernate;

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

    public String getWifeName() {
        return wifeName;
    }

    public void setWifeName(String wifeName) {
        this.wifeName = wifeName;
    }

    public int getAge() {
        return age;
    }

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

生成的SQL语句

XML 配置：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.bjsxt.hibernate">
    <class name="Husband" table="husband">
        <id name="id" column="id">
            <generator class="native"/>
        </id>
        
        <property name="name" column="name" />
        
        <component name="wife">
            <property name="wifeName" column="wifeName" />
            <property name="age" column="wifeAge" />
        </component>
    </class>
</hibernate-mapping>

生成的SQL语句：

jar包链接: https://pan.baidu.com/s/1kUARge7 密码: nsyb

代码链接: https://pan.baidu.com/s/1o7QZZOA 密码: stbv