Hibernate知识要点复习(2) 一对一双向关联（注解）及 关联中各种注释的作用

       建立实体域对象。丈夫和妻子

package org.yyf.hibernateexample.domain.onetoone.twoway;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;

/**
 * 
 * @author yeyf
 * @date 2013年12月12日
 */
@Entity
@Table(name="twoway_husband")
public class Husband {
	@Id
	@GeneratedValue(strategy=GenerationType.SEQUENCE)
	private Long ID;
	@Column(name="name")//如果属性名就是列名就省略了
	private String name;
	private Integer age;
	@OneToOne
	@JoinColumn(name="wife_id")
	private Wife wife;
	public Wife getWife() {
		return wife;
	}

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

	public Long getID() {
		return ID;
	}

	public void setID(Long iD) {
		ID = iD;
	}

	public String getName() {
		return name;
	}

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

	public Integer getAge() {
		return age;
	}

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

}

package org.yyf.hibernateexample.domain.onetoone.twoway;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.Table;


/**
 *
 *@author yeyf
 *@date 2013年12月12日
 */
@Entity
@Table(name="twoway_wife")
public class Wife {
	@Id
	@GeneratedValue(strategy=GenerationType.AUTO)
	private Long ID;
	private String name;
	private Integer age;
	@OneToOne(mappedBy="wife")
	private Husband husband;
	
	public Husband getHusband() {
		return husband;
	}
	public void setHusband(Husband husband) {
		this.husband = husband;
	}
	public Long getID() {
		return ID;
	}
	public void setID(Long iD) {
		ID = iD;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	
}

这里第一个值得说道的就是注解是用jpa的还是hibernate的。

       hibernate有一套自己的注释，可以很方便的实现 ORM。但是sun公司为了统一ORM规范，把hibernate的作者Gavin King挖过去又做了一套ORM框架叫JPA，并按照惯有套路定义了一套接口，宣称我这个才是规范（= =）这样JPA后来居上成为了ORM的标准实现。所以JPA的注释完全兼容Hibernate。所以除非要使用到Hibernate中的某些特殊功能，否则定义的