hibernate中1VS1操作过程

一、数据库中两个表:

-- 删除表

DROP TABLE idcard ;

DROP TABLE person ;

-- 创建表

CREATE TABLE person

(

id VARCHAR(32) NOT NULL PRIMARY KEY ,

name VARCHAR(20) NOT NULL ,

age int

) ;

CREATE TABLE idcard

(

id VARCHAR(32) NOT NULL PRIMARY KEY ,

serial VARCHAR(18) NOT NULL ,

expiry int

) ;

它们是一对一关系：

二、POJO类如下：

package com.wangbass.pojo;

public class Person {

private String id;

private String name;

private Integer age;

private IDCard idCard;

public IDCard getIdCard() {

return idCard;

}

public void setIdCard(IDCard idCard) {

this.idCard = idCard;

}

public Integer getAge() {

return age;

}

public void setAge(Integer age) {

this.age = age;

}

public String getId() {

return id;

}

public void setId(String id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

package com.wangbass.pojo;

public class IDCard {

private String id;

private String serial;

private Integer expiry;

private Person person;

public Integer getExpiry() {

return expiry;

}

public void setExpiry(Integer expiry) {

this.expiry = expiry;

}

public String getId() {

return id;

}

public void setId(String id) {

this.id = id;

}

public Person getPerson() {

return person;

}

public void setPerson(Person person) {

this.person = person;

}

public String getSerial() {

return serial;

}

public void setSerial(String serial) {

this.serial = serial;

}

三、映射文件：

<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<!--

Mapping file autogenerated by MyEclipse Persistence Tools

-->

<hibernate-mapping>

</id>

</property>

</property>

<one-to-one name="idCard" class="com.wangbass.pojo.IDCard"

cascade="all">

</one-to-one>

</class>

</hibernate-mapping>

其中的<one-to-one>中的cascade=”all”很关键。

<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<!--

Mapping file autogenerated by MyEclipse Persistence Tools

-->

<hibernate-mapping>

<param name="property">person</param>

</generator>

</id>

</property>

</property>

<one-to-one name="person" class="com.wangbass.pojo.Person"></one-to-one>

</class>

</hibernate-mapping>

其中<id name="id" type="java.lang.String">

<param name="property">person</param>

</generator>

</id>

指定与person的外键关联。

四、测试类如下：

package com.wangbass.pojo;

import java.util.List;

import org.hibernate.Query;

import org.hibernate.Session;

import org.hibernate.cfg.Configuration;

public class HibernateDemo01Test {

private Session session;

public HibernateDemo01Test() {

this.session = new Configuration().configure().buildSessionFactory()

.openSession();

}

public void insert(Person p) {

this.session.save(p);

this.session.beginTransaction().commit();

}

public void update(Person p) {

this.session.update(p);

this.session.beginTransaction().commit();

}

public Person queryById(String id) {

Person p = null;

String hql = "FROM Person p WHERE p.id=?";

Query q = this.session.createQuery(hql);

q.setString(0, id);

List l = q.list();

if (l.size() != 0) {

p = (Person) l.get(0);

}

return p;

}

public void delete(Person p) {

this.session.delete(p);

this.session.beginTransaction().commit();

}

public static void main(String[] args) {

HibernateDemo01Test hdt = new HibernateDemo01Test();

/*

* Person p=new Person(); p.setAge(13); p.setName("王权2"); IDCard

* idcard=new IDCard(); idcard.setSerial("2222222222");

* idcard.setExpiry(13); idcard.setPerson(p); p.setIdCard(idcard);

* hdt.insert(p);

*/

Person p = hdt.queryById("2c9ab70a20cc9e4c0120cc9e4dd10001");

System.out.println("Person name:" + p.getName());

System.out.println("Person age:" + p.getAge());

/*

* p.setAge(20); IDCard idcard=p.getIdCard(); System.out.println("IDCard

* Expiry:"+idcard.getExpiry()); idcard.setExpiry(20); hdt.update(p);

*/

hdt.delete(p);

// TODO Auto-generated method stub

}

这样无论对Person对象进行什么操作，idcard对象就会自动跟着操作，实现目的。

hibernate中1VS1操作过程

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