S `wife` (`id`)
)
4、加入@JoinColumn(name="wifeId")可以修改husband表中外键的列的名称。再次运行show create table husband;可以看到如下片段
CREATE TABLE `husband` (
`id` int(11) NOT NULL,
`name` varchar(255) DEFAULT NULL,
`wifeId` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `FK_kruq9jfxa0jrc2od8dbh09mia` (`wifeId`),
CONSTRAINT `FK_kruq9jfxa0jrc2od8dbh09mia` FOREIGN KEY (`wifeId`) REFERENCES `wife` (`id`)
)
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二、xml配置
在xml中配置one2one的方法如下：
观察结果：
1.在xml中配置的是many-to-one和 unique="true"
第二种：一对一双向外键关联
一、Annotation配置
1.在一对一双向外键关联的时候，可以使用@OneToOne(mappedBy="对象名")的方式设置。
2.凡是双向关联，必设MappedBy
Husband.java
package com.zgy.hibernate.model;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
@Entity
public class Husband {
private int id;
private String name;
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;
}
@OneToOne
public Wife getWife() {
return wife;
}
public void setWife(Wife wife) {
this.wife = wife;
}
}
Wife.java
package com.zgy.hibernate.model;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToOne;
@Entity
public class Wife {
private int id;
private String name;
private Husband husband;
@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;
}
@OneToOne(mappedBy="wife")
public Husband getHusband() {
return husband;
}
public void setHusband(Husband husband) {
this.husband = husband;
}
}
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二、xml设置：
范例：
第三种：一对一单向主键关联（不重要）
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1.使用如下的Annotation设置一对一单项主键关联（目前没有成功过，Hibernate文档上所写，但是没有成功实现过）
@OneToOne
@PrimaryKeyJoinColumn
2.xml中的配置
person
第四种：一对一双向主键关联（不重要）
第五种：一对一联合主键
一、Annotation配置
1.在wife.java中使用id和name作为联合主键
2.在husband.java中关联到wife.java中的联合主键
范例：
Wife.java
package com.zgy.hibernate.model;
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.IdClass;
import javax.persistence.OneToOne;
import javax.persistence.PrimaryKeyJoinColumn;
@Entity
@IdClass(WifePK.class)
public class Wife {
private int id;
private String name;
private int age;
@Id
public int getId() {
return id;
}
@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