Hibernate一对一外键双向关联(Annotation配置篇)

Husband.java

package com.one2one.bean;

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

@Entity
@Table(name = " husband " ,catalog = " Hibernate_One2One_fk " )
public class Husband{

private int id;
private Stringname;
private Wifewife;
@Id
@Column(name = " id " )
@GeneratedValue(strategy = GenerationType.AUTO)
public int getId(){
return id;
}
public void setId( int id){
this .id = id;
}
@Column(name = " name " )
public StringgetName(){
return name;
}
public void setName(Stringname){
this .name = name;
}
@OneToOne(cascade = CascadeType.ALL,mappedBy = " husband " )
public WifegetWife(){
return wife;
}
public void setWife(Wifewife){
this .wife = wife;
}

}

Wife.java

package com.one2one.bean;

import javax.persistence.CascadeType;
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;

@Entity
@Table(name = " wife " ,catalog = " Hibernate_One2One_fk " )
public class Wife{

private int id;
private Stringname;
private Husbandhusband;
@Id
@Column(name = " id " )
@GeneratedValue(strategy = GenerationType.AUTO)
public int getId(){
return id;
}
public void setId( int id){
this .id = id;
}
@Column(name = " name " )
public StringgetName(){
return name;
}
public void setName(Stringname){
this .name = name;
}
@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(name = " husband_id " )
public HusbandgetHusband(){
return husband;
}
public void setHusband(Husbandhusband){
this .husband = husband;
}

}

导出的sql

create table Hibernate_One2One_fk.husband(
id integer not null auto_increment,
name varchar ( 255 ),
primary key (id)
)

create table Hibernate_One2One_fk.wife(
id integer not null auto_increment,
name varchar ( 255 ),
husband_id integer ,
primary key (id)
)

alter table Hibernate_One2One_fk.wife
add index FK37AF119039AEDD(husband_id),
add constraint FK37AF119039AEDD
foreign key (husband_id)
references Hibernate_One2One_fk.husband(id)

测试代码

@Test
public void save(){
Sessionsession = HibernateSessionFactory.getSession();
Transactiontransaction = session.beginTransaction();
try {
transaction.begin();
Husbandhusband = new Husband();
husband.setName( " 张三 " );
session.save(husband);
Wifewife = new Wife();
wife.setName( " 如花 " );
wife.setHusband(husband);
session.save(wife);
transaction.commit();
} catch (HibernateExceptione){
e.printStackTrace();
}
}

@Test
public void select(){
Sessionsession = HibernateSessionFactory.getSession();
Husbandhusband = (Husband)session.get(Husband. class , 1 );
System.out.println(husband.getName());
System.out.println(husband.getWife().getName());
}