Hibernate之one-to-one双向外键关联Annotation

Husband.java

package com.itmyhome.model;import javax.persistence.Entity;import javax.persistence.FetchType;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.JoinColumn;import javax.persistence.OneToOne;@Entitypublic class Husband {private int id;private String name;private Wife wife;/* * Id生成策略 mysql默认是auto_crement */@Id@GeneratedValuepublic int getId() {return id;}public void setId(int id) {this.id = id;}/* * OneToOne * JoinColumn用来指定生成的外键名字  */@OneToOne(fetch=FetchType.LAZY)@JoinColumn(name="wifeId")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;}}

Wife.java

package com.itmyhome.model;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;import javax.persistence.JoinColumn;import javax.persistence.OneToOne;@Entitypublic class Wife {private int id;private String name;private Husband husband;@Id@GeneratedValuepublic int getId() {return id;}public void setId(int id) {this.id = id;}/* * 凡是双向必设mappedBy * 如果不设mappedBy 双方都会加外键约束  */@OneToOne(mappedBy="wife")@JoinColumn(name="husbandId")public Husband getHusband() {return husband;}public void setHusband(Husband husband) {this.husband = husband;}public String getName() {return name;}public void setName(String name) {this.name = name;}}

hibernate生成的sql如下：

create table Husband (        id integer not null auto_increment,        name varchar(255),        wifeId integer,        primary key (id)    )

 

create table Wife (        id integer not null auto_increment,        name varchar(255),        primary key (id)    )alter table Husband         add index FKAEEA401B78A8164D (wifeId),         add constraint FKAEEA401B78A8164D         foreign key (wifeId)         references Wife (id)