Hibernate_组件关联

组件映射_Annotation

在java中组件映射就是一个类中应用另一个类，而在数据库中的表现为一张表。即上面的实例中将Husband表和Wife表合并为一张表Husband。

Husband类代码如下：

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

Wife代码如下：

public class Wife {
	private String wifeName;
	private int wifeAge;
	public String getWifeName() {
		return wifeName;
	}
	public void setWifeName(String wifeName) {
		this.wifeName = wifeName;
	}
	public int getWifeAge() {
		return wifeAge;
	}
	public void setWifeAge(int wifeAge) {
		this.wifeAge = wifeAge;
	}
	
	
}

注意：此时的wife无需在做实体化@Entity，并且Hibernate.cfg.xml 配置文件中也不需要配置。 在Husband  类 中用 @Embedded来嵌入。