hibernate映射组成关系

package com.hibernate.helloworld;public class School {
private String name;
private String address;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public School(String name, String address) {
super();
this.name = name;
this.address = address;
}
public School() {
super();
// TODO Auto-generated constructor stub
}
@Override
public String toString() {
return "School [name=" + name + ", address=" + address + "]";
}}package com.hibernate.helloworld;import java.util.Date;public class Student {
private Integer id;
private String name;
private Date birth;
private School school; public Student() {
// TODO Auto-generated constructor stub
}
public Student(String name, Date birth) {
super();
this.name = name;
this.birth = birth;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Date getBirth() {
return birth;
}
public void setBirth(Date birth) {
this.birth = birth;
} public School getSchool() {
return school;
}
public void setSchool(School school) {
this.school = school;
}
@Override
public String toString() {
return "Student [id=" + id + ", name=" + name + ", birth=" + birth + ", school=" + school + "]";
}}

<?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">
<hibernate-configuration>
<session-factory>
<!-- 配置连接数据库的基本信息 -->
<property name="connection.username">root</property>
<property name="connection.password">1</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&amp;characterEncoding=UTF-8</property> <!-- 配置 hibernate 的基本信息 -->
<property name="dialect">org.hibernate.dialect.MySQLInnoDBDialect</property> <!-- 执行操作时是否在控制台打印 SQL -->
<property name="show_sql">true</property> <!-- 是否对 SQL 进行格式化 -->
<property name="format_sql">true</property> <!-- 指定自动生成数据表的策略 -->
<property name="hbm2ddl.auto">update</property> <!-- 指定关联的 .hbm.xml 文件 -->
<mapping resource="com/hibernate/helloworld/Student.hbm.xml" />
</session-factory>
</hibernate-configuration>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2017-8-7 21:15:19 by Hibernate Tools 3.4.0.CR1 -->
<hibernate-mapping package="com.hibernate.helloworld">
<class name="Student" table="STUDENT" dynamic-insert="true">
<id name="id" type="java.lang.Integer">
<column name="ID" />
<generator class="native" />
</id>
<property name="name" type="java.lang.String">
<column name="NAME" />
</property>
<property name="birth" type="java.util.Date">
<column name="BIRTH" />
</property> <component name="school" class="School">
<property name="name" column="SCHOOL_NAME"></property>
<property name="address" column="SCHOOL_ADDRESS"></property>
</component>
</class>
</hibernate-mapping>

package com.hibernate.helloworld;import java.sql.Date;import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
import org.junit.Test;public class test { @Test
public void test() { System.out.println("test..."); //1. 创建一个 SessionFactory 对象
SessionFactory sessionFactory = null; //1). 创建 Configuration 对象: 对应 hibernate 的基本配置信息和 对象关系映射信息
Configuration configuration = new Configuration().configure(); //4.0 之前这样创建
// sessionFactory = configuration.buildSessionFactory(); //2). 创建一个 ServiceRegistry 对象: hibernate 4.x 新添加的对象
//hibernate 的任何配置和服务都需要在该对象中注册后才能有效.
ServiceRegistry serviceRegistry =
new ServiceRegistryBuilder().applySettings(configuration.getProperties())
.buildServiceRegistry(); //3).
sessionFactory = configuration.buildSessionFactory(serviceRegistry); //2. 创建一个 Session 对象
Session session = sessionFactory.openSession(); //3. 开启事务
Transaction transaction = session.beginTransaction(); //4. 执行保存操作
Student student = new Student("刘备", new Date(new java.util.Date().getTime()));
School school = new School("AAA","BBB");
student.setSchool(school);
session.save(student); //5. 提交事务
transaction.commit(); //6. 关闭 Session
session.close(); //7. 关闭 SessionFactory 对象
sessionFactory.close();
}}