hibernate学习之1:1映射

1、hibernate1:1映射（外键关联）

2、包结构：


3、源代码：
Account.java

package domain;

public class Account {
	private String id;
	private String acctNo;
	private double bal;
	private User owner;

	public Account() {
	}

	public Account(String acctNo, double bal) {
		this.acctNo = acctNo;
		this.bal = bal;
	}

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getAcctNo() {
		return acctNo;
	}

	public void setAcctNo(String acctNo) {
		this.acctNo = acctNo;
	}

	public double getBal() {
		return bal;
	}

	public void setBal(double bal) {
		this.bal = bal;
	}

	public User getOwner() {
		return owner;
	}

	public void setOwner(User owner) {
		this.owner = owner;
	}

}

Account.hbm.xml

<?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" >
<hibernate-mapping package="domain">
	<class name="Account" table="ACCOUNT">
		<id name="id">
			<column name="id"></column>
			<generator class="uuid"></generator>
		</id>
		<property name="acctNo" column="ACCTNO"></property>
		<property name="bal" column="BAL"></property>
		<one-to-one name="owner" property-ref="acct"></one-to-one>
	</class>
	
</hibernate-mapping>

User.java

package domain;

public class User {
	private String id;
	private String name;
	private int age;
	private Account acct;

	public User() {
	}

	public User(String name, int age) {
		this.age = age;
		this.name = name;
	}

	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;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public Account getAcct() {
		return acct;
	}

	public void setAcct(Account acct) {
		this.acct = acct;
	}

}

User.hbm.xml

<?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" >
<hibernate-mapping package="domain">
	<class name="User" table="USERS">
		<id name="id" column="ID">
			<generator class="uuid"></generator>
		</id>
		<property name="name" column="NAME"></property>
		<property name="age" column="AGE"></property>
		<many-to-one name="acct" column="FID" unique="true"></many-to-one>
	</class>
</hibernate-mapping>

工具类HbnUtil.java

package util;

import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HbnUtil {
	private static SessionFactory sessionFactory;
	private HbnUtil(){}
	public static synchronized SessionFactory getSessionFactory(){
		if(sessionFactory==null){
			sessionFactory=new Configuration().configure().buildSessionFactory();
		}
		return sessionFactory;
	}
}

hibernate.cfg.xml:

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

    <session-factory>
        <property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>
        <property name="connection.url">jdbc:oracle:thin:@127.0.0.1:1521:myorcl</property>
        <property name="connection.username">myorcl</property>
        <property name="connection.password">embed</property>
        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
    	<property name="show_sql">true</property>
    	<property name="format_sql">true</property>
		<mapping resource="domain/Account.hbm.xml"/>
		<mapping resource="domain/User.hbm.xml"/>
    </session-factory>

</hibernate-configuration>

测试类：

package test;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import domain.Account;
import domain.User;

public class TestUser {
	public static void main(String[]args){
		SessionFactory sf=util.HbnUtil.getSessionFactory();
		Session session=sf.openSession();
		session.beginTransaction();
		
		User user=new User("newuser",24);
		Account acct=new Account("acct_04",1000.0);
		user.setAcct(acct);
		
		session.save(acct);
		session.save(user);
		
		session.getTransaction().commit();
		session.close();
		sf.close();
	}
}