Hibernate一对一外键双向关联(Annotation配置)
package edu.xaut.hibernate;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
@Entity
public class Student {
private int id;
private String name;
private String gender;
private int age;
private StuIdCard stuIdCard;
@Id
@GeneratedValue
public int getId() {
return id;
}
@Column(name = "name", length = 20)
public String getName() {
return name;
}
@Column(name = "gender", length = 6)
public String getGender() {
return gender;
}
public int getAge() {
return age;
}
@OneToOne
@JoinColumn(name = "StuIdCard")
public StuIdCard getStuIdCard() {
return stuIdCard;
}
public void setId(int id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setGender(String gender) {
this.gender = gender;
}
public void setAge(int age) {
this.age = age;
}
public void setStuIdCard(StuIdCard stuIdCard) {
this.stuIdCard = stuIdCard;
}
}
package edu.xaut.hibernate;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToOne;
@Entity
public class StuIdCard {
private int id;
private String num;
private Student student;
@Id
@GeneratedValue
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Column(length = 20)
public String getNum() {
return num;
}
public void setNum(String num) {
this.num = num;
}
@OneToOne(mappedBy="stuIdCard")
public Student getStudent() {
return student;
}
public void setStudent(Student student) {
this.student = student;
}
}
导出的SQL语句如下:
create table StuIdCard (
id integer not null auto_increment,
num varchar(20),
primary key (id)
)
create table Student (
id integer not null auto_increment,
age integer not null,
gender varchar(6),
name varchar(20),
StuIdCard integer,
primary key (id)
)
alter table Student
add index FKF3371A1BFDFA0D4 (StuIdCard),
add constraint FKF3371A1BFDFA0D4
foreign key (StuIdCard)
references StuIdCard (id)
测试代码如下:
package edu.xaut.hibernate;
import org.hibernate.Session;
import org.hibernate.cfg.*;
import org.hibernate.tool.hbm2ddl.SchemaExport;
import org.junit.Test;
import edu.xaut.wuqiang.hibernate.util.HibernateUtil;
public class HibernateORMappingTest {
@Test
public void testStudentSave() {
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
StuIdCard stuIdCard = new StuIdCard();
stuIdCard.setNum("1008120672");
session.save(stuIdCard);
Student stu = new Student();
stu.setName("Lily");
stu.setGender("Female");
stu.setAge(22);
stu.setStuIdCard(stuIdCard);
session.save(stu);
session.getTransaction().commit();
HibernateUtil.getSessionFactory().close();
}
@Test
public void testQueryStuInfo() {
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
StuIdCard stuIdCard = (StuIdCard) session.get(StuIdCard.class, 1);
System.out.println(stuIdCard.getNum());
System.out.println(stuIdCard.getStudent().getName() + "\t"
+ stuIdCard.getNum() + "\t"
+ stuIdCard.getStudent().getGender() + "\t"
+ stuIdCard.getStudent().getAge());
session.getTransaction().commit();
HibernateUtil.getSessionFactory().close();
}
@Test
public void testSchemaExport() {
new SchemaExport(new AnnotationConfiguration().configure()).create(
true, true);
}
}
运行结果如下:
select
stuidcard0_.id as id0_1_,
stuidcard0_.num as num0_1_,
student1_.id as id1_0_,
student1_.age as age1_0_,
student1_.gender as gender1_0_,
student1_.name as name1_0_,
student1_.StuIdCard as StuIdCard1_0_
from
StuIdCard stuidcard0_
left outer join
Student student1_
on stuidcard0_.id=student1_.StuIdCard
where
stuidcard0_.id=?
1008120672
Lily 1008120672 Female 22
http://blog.sina.com.cn/s/blog_4979ec3e010174nx.html
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