hibernate关系映射--双向一对一@OneToOne

1.基于外键的双向一对一

1. 基于外键的双向一对一，外键可以存放在任意一端，只需在外键表的那端添加注解@OneToOne，@JoinColumn
2. 在主表中也应添加注解@OneToOne，同时设置mappedBy属性（放弃控制关联关系，否则会生成额外的关联关系，引起性能下降）
3. 主要代码及例子

• 从表@OneToOne(cascade={CascadeType.ALL}) @JoinColumn(name="")
• 主表@OneToOne

<span style="font-family:Arial;">//表一
@Entity
@Table(name = "T_JC_test1")
@Where(clause="recordStatus='"+GlobalConstant.FLAG_Y+"'")
public class Test1 extends BusinessEntity{
	private static final long serialVersionUID = 2535128385272676564L;
	private String name;
	private Test2 tese2;  //引用表二
	public String getName() {
		return name;
	}
	@OneToOne(cascade={CascadeType.ALL})
	@JoinColumn(name="test1ID")
	public Test2 getTese2() {
		return tese2;
	}
	public void setTese2(Test2 tese2) {
		this.tese2 = tese2;
	}
	public void setName(String name) {
		this.name = name;
	}
}

//表二
@Entity
@Table(name = "T_JC_test2")
@Where(clause="recordStatus='"+GlobalConstant.FLAG_Y+"'")
public class Test2 extends BusinessEntity{
	private static final long serialVersionUID = -7653945367481001205L;
	private String addressDetatil;
	private Test1 test1;<span style="white-space:pre">		</span>//引用表一
	
	@OneToOne
	public Test1 getTest1() {
		return test1;
	}
	public void setTest1(Test1 test1) {
		this.test1 = test1;
	}
	public String getAddressDetatil() {
		return addressDetatil;
	}
	public void setAddressDetatil(String addressDetatil) {
		this.addressDetatil = addressDetatil;
	}	
}
</span>

2. 有链接表的双向一对一（不推荐使用）