Hibernate一对一实现 - JAVA

1.新建两个POJO类

Member.java

[java]
package com.mxl.onetoone;

public class Member {
private int id;
private String name;
private int age;
private IdCard card;
//省去setter,getter
}

package com.mxl.onetoone;

public class Member {
private int id;
private String name;
private int age;
private IdCard card;
//省去setter,getter
}
IdCard.java

[java]
package com.mxl.onetoone;

public class IdCard {
private int id;
private String num;
private Member member;
//省去setter,getter
}

package com.mxl.onetoone;

public class IdCard {
private int id;
private String num;
private Member member;
//省去setter,getter
}2.在src下新建hibernate的主配置文件,名为hibernate.cfg.xml

[html]
< xml version="1.0" encoding="UTF-8" >
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

com.mysql.jdbc.Driver

jdbc:mysql:///test

root

123456

true

1
org.hibernate.dialect.MySQLDialect

< xml version="1.0" encoding="UTF-8" >
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

com.mysql.jdbc.Driver

jdbc:mysql:///test

root

123456

true

1
org.hibernate.dialect.MySQLDialect

3.新建一个名为Member.hbm.xml的xml的文件

[html]
xml version="1.0" encoding="UTF-8" >
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

< xml version="1.0" encoding="UTF-8" >
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

IdCard.hbm.xml的xml文件

[html]
< xml version="1.0" encoding="UTF-8" >
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

member

< xml version="1.0" encoding="UTF-8" >
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

member

在Member.hbm.xml文件中

[html]

name:是类名称,table:是与Member类相对应的数据表

[html]

name:是Member类中的的属性。column是表中的字段名,该项可省略，如果省略则该值与name的值相同

[html]

建立一对一的关联。class:与Member类进行关联的类名，cascade级联关系，值为all。对Memberd类的对象进行修改（删除）时，同时修改(删除)IdCard类对象。

[html]

member

member

表示采用member产生的主键ID值作为该字段的值。
4.编写一个测试新增记录的类

[java]
public static void main(String []args){
Session session = HibernateUtil.sessionFactory.openSession();
Transaction tx = session.beginTransaction();
Member m = new Member();
m.setAge(34);
m.setName("TT");

IdCard card = new IdCard();

card.setNum("628443201");
card.setMember(m);

m.setCard(card);

session.save(m);
tx.commit();
}

public static void main(String []args){
Session session = HibernateUtil.sessionFactory.openSession();
Transaction tx = session.beginTransaction();
Member m = new Member();
m.setAge(34);
m.setName("TT");

IdCard card = new IdCard();

card.setNum("628443201");

Hibernate一对一实现 (一)