Hibernate映射組件屬性xml形式之方式一

1.組件是指：持久化類的屬性並不是基本數據類型，也不是字符串、日期等標量類型的變量，而是一個複合類型的對象。

參考：http://www.tutorialspoint.com/hibernate/hibernate_component_mappings.htm

2.新建一個maven項目

3.編寫pom.xml文件

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.meterbox</groupId>
	<artifactId>HibernateDemo</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>HibernateDemo Maven Webapp</name>
	<url>http://maven.apache.org</url>

	<!-- 屬性配置 -->
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<log4j.version>1.2.17</log4j.version>
		<mysql.version>5.1.30</mysql.version>
	</properties>

	<dependencies>


		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
			<scope>test</scope>
		</dependency>


		<!-- 添加Hibernate依賴 -->
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-core</artifactId>
			<version>3.6.10.Final</version>
		</dependency>


		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>${mysql.version}</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
			<version>1.6.1</version>
		</dependency>

		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-nop</artifactId>
			<version>1.6.4</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>1.7.2</version>
		</dependency>

		<!-- 添加javassist -->
		<dependency>
			<groupId>javassist</groupId>
			<artifactId>javassist</artifactId>
			<version>3.11.0.GA</version>
		</dependency>
		<!-- jsp頁面的jar -->
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>3.0.1</version>
		</dependency>
		<!-- 日誌 -->
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<version>${log4j.version}</version>
		</dependency>
		<dependency>
			<groupId>commons-logging</groupId>
			<artifactId>commons-logging</artifactId>
			<version>1.2</version>
		</dependency>

	</dependencies>
	<build>
		<finalName>HibernateDemo</finalName>
	</build>
</project>

4.編寫Hibernate配置文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 
"http://hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
	<session-factory>
		<property name="connection.driver_class">
			com.mysql.jdbc.Driver
		</property>
		<property name="connection.url">jdbc:mysql://localhost:3306/zhjdata?useUnicode=true&characterEncoding=UTF-8</property>
		<property name="connection.username">root</property>
		<property name="connection.password">123456</property>
		<!-- 顯示SQL語句 -->
		<property name="show_sql">true</property>
		<property name="format_sql">true</property>
		
		<!-- 根據需要自動創建數據庫 -->
		<property name="hbm2ddl.auto">update</property>
		
		<!-- 定義方言 -->
		<property name="dialect">
			org.hibernate.dialect.MySQL5Dialect
		</property>

        <!-- 指定連接池裏最大連接數 -->
		<property name="hibernate.c3p0.max_size">20</property>
		<!-- 指定連接池裏最小連接數 -->
		<property name="hibernate.c3p0.min_size">1</property>
		<!-- 指定連接池裏連接的超時時長 -->
		<property name="hibernate.c3p0.timeout">5000</property>
		
        <!-- 指定連接池裏最大緩存多少個Statement對象 -->
		<property name="hibernate.c3p0.max_statements">100</property>
		<property name="hibernate.c3p0.idle_test_period">3000</property>
		<property name="hibernate.c3p0.acquire_increment">2</property>
		<property name="hibernate.c3p0.validate">true</property>
        
    
        <mapping resource="cn/edu/hpu/component/model/Employee.hbm.xml"/>
	</session-factory>
</hibernate-configuration>

5.編寫Address類和Person類

package cn.edu.hpu.component.model;

public class Address {
	private int id;
	private String street;
	private String city;
	private String state;
	private String zipcode;

	public Address() {
	}

	public Address(String street, String city, String state, String zipcode) {
		this.street = street;
		this.city = city;
		this.state = state;
		this.zipcode = zipcode;
	}
//get.. set..
}

package cn.edu.hpu.component.model;

public class Employee implements java.io.Serializable {
	private int id;
	private String firstName;
	private String lastName;
	private int salary;
	private Address address;

	public Employee() {
	}

	public Employee(String fname, String lname, int salary, Address address) {
		this.firstName = fname;
		this.lastName = lname;
		this.salary = salary;
		this.address = address;
	}
//get ..  set ...
}

 6.編寫Employee.hbm.xml文件

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

<!DOCTYPE hibernate-mapping PUBLIC 
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="cn.edu.hpu.component.model">
	<class name="Employee" table="EMPLOYEE">
      <meta attribute="class-description">
         This class contains the employee detail. 
      </meta>
      <id name="id" type="int" column="id">
         <generator class="native"/>
      </id>
      <component name="address" class="Address">
         <property name="street" column="street_name" type="string"/>
         <property name="city" column="city_name" type="string"/>
         <property name="state" column="state_name" type="string"/>
         <property name="zipcode" column="zipcode" type="string"/>
      </component>
      <property name="firstName" column="first_name" type="string"/>
      <property name="lastName" column="last_name" type="string"/>
      <property name="salary" column="salary" type="int"/>
   </class>
</hibernate-mapping>

7.編寫HibernateUtil類

package cn.edu.hpu.util;


import org.apache.log4j.Logger;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {

	/** ThreadLocal Session Map */
	public static final ThreadLocal<Session> SESSIONMAP = new ThreadLocal<Session>();
	private static final SessionFactory sessionFactory;
	private static final Logger LOGGER = Logger.getLogger("appender2");
	static {
		try {
			LOGGER.debug("HibernateUti.static - loading cofig");
			sessionFactory = new Configuration().configure("hibernate.cfg.xml")
					.buildSessionFactory();
			LOGGER.debug("HibernateUtil.static - end");
		} catch (Throwable ex) {
			ex.printStackTrace();
			LOGGER.error("HibernateUti error : ExceptionInInitializerError");
			throw new ExceptionInInitializerError(ex);
		}
	}

	private HibernateUtil() {

	}

	public static Session getSession() throws HibernateException {
		Session session = SESSIONMAP.get();

		if (session == null) {
			session = sessionFactory.openSession();
			SESSIONMAP.set(session);
		}

		return session;
	}

	public static void closeSession() throws HibernateException {
		Session session = SESSIONMAP.get();
		SESSIONMAP.set(null);

		if (session != null) {
			session.close();
		}
	}
}

8.寫測試類

public class PersonManger {
@Test
	public void testSaveCompont() {
		Session session = HibernateUtil.getSession();
		Transaction trans = session.beginTransaction();
		
		Address address = new Address("文化路","深圳","22號","1棟");
		Address address2 = new Address("文化路","北京","22號","2棟");
		Employee em1 = new Employee("Zhang","Jomes",888888,address);
		Employee em2 = new Employee("Zhang2","Jomes2",999999,address2);
		session.save(em2);
		session.save(em1);
		trans.commit();
		HibernateUtil.closeSession();
	}
}