Hibernate一对一主键双向关联映射(Annotation配置)
2010-10-21 09:02:03| 分类：
hiber_1
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实体
Husband
package com.hibernate.one2one.bean;
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.PrimaryKeyJoinColumn;
import javax.persistence.Table;
@Entity
@Table(name="husband")
public class Husband {
private int id;
private String name;
private Wife wife;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
@Column(name="id")
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Column(name="name")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@OneToOne
@PrimaryKeyJoinColumn
public Wife getWife() {
return wife;
}
public void setWife(Wife wife) {
this.wife = wife;
}
}
Wife
package com.hibernate.one2one.bean;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.Table;
@Entity
@Table(name="wife")
public class Wife {
private int id;
private String name;
private Husband husband;
@Id
@Column(name="id")
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Column(name="name")
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@OneToOne(optional=false)
@PrimaryKeyJoinColumn
public Husband getHusband() {
return husband;
}
public void setHusband(Husband husband) {
this.husband = husband;
}
}
温馨提示:注意wife.java里面的@OneToOne(optional=false) optional=false 属性会在wife这端添加一个外键约束
添加上上述属性使用hbm2ddl导出表，打印出的sql语句
alter table wife
drop
foreign key FK37AF11D67CB035
drop table if exists husband
drop table if exists wife
create table husband (
id integer not null auto_increment,
name varchar(255),
primary key (id)
)
create table wife (
id integer not null,
name varchar(255),
primary key (id)
)
alter table wife
add index FK37AF11D67CB035 (id),
add constraint FK37AF11D67CB035
foreign key (id)
references husband (id)
@Test
public void insert(){
Session session=HibernateSessionFactory.getSession();
Transaction transaction=session.beginTransaction();
try {
transaction.begin();
Husband husband=new Husband();
husband.setName("小明");
session.save(husband);
Wife wife=new Wife();
wife.setName("如花");
wife.setHusband(husband);
wife.setId(husband.getId());
session.save(wife);
transaction.commit();
} catch (HibernateException e) {
e.printStackTrace();
transaction.rollback();
}
}
@Test
public void insert(){
Session session=HibernateSessionFactory.getSession();
Transaction transaction=session.beginTransaction();
try {
transaction.begin();
Husband husband=new Husband();
husband.setName("小明");
session.save(husband);
Wife wife=new Wife();
wife.setName("如花");
wife.setHusband(husband);
wife.setId(husband.getId());
session.save(wife);
transaction.commit();
} catch (HibernateException e) {
e.printStackTrace();
transaction.rollback();
}
}
温馨提醒:此处必须同时设置
wife.setHusband(husband);
wife.setId(husband.getId());
否则报org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
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