Spring与Hibernate的整合

下面为例子中将要操作的对象

package org.spring.bean;

public class Person {
	private Integer id;
	private String name;

	public Person() {
	}

	public Person(String name) {
		this.name = name;
	}

	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;
	}
}

与Person对象对应的映射文件

<?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">

<hibernate-mapping package="org.spring.bean">
	<class name="Person" table="person">
		<cache usage="read-write" region="org.spring.bean.Person" />
		<id name="id">
			<generator class="native" />
		</id>
		<property name="name" length="10" not-null="true" />
	</class>
</hibernate-mapping>

对Person对象操作的接口

package org.spring.service;

import java.util.List;

import org.spring.bean.Person;

public interface PersonService {

	public void save(Person person);

	public void update(Person person);

	public Person getPerson(Integer personid);

	public void delete(Integer personid);

	public List<Person> getPersons();

}

业务bean的实现类

package org.spring.service.impl;

import java.util.List;

import javax.annotation.Resource;

import org.hibernate.SessionFactory;
import org.spring.bean.Person;
import org.spring.service.PersonService;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

@Transactional
public class PersonServiceBean implements PersonService {
	@Resource
	private SessionFactory sessionFactory;

	public void save(Person person) {
		sessionFactory.getCurrentSession().persist(person);
	}

	public void update(Person person) {
		sessionFactory.getCurrentSession().merge(person);
	}

	@Transactional(propagation = Propagation.NOT_SUPPORTED, readOnly = true)
	public Person getPerson(Integer personid) {
		return (Person) sessionFactory.getCurrentSession().get(Person.class,
				personid);
	}

	public void delete(Integer personid) {
		sessionFactory.getCurrentSession()
				.delete(sessionFactory.getCurrentSession().load(Person.class,
						personid));
	}

	@Transactional(propagation = Propagation.NOT_SUPPORTED, readOnly = true)
	@SuppressWarnings("unchecked")
	public List<Person> getPersons() {
		return sessionFactory.getCurrentSession().createQuery("from Person")
				.list();
	}

}

在获取数据的时候，一般不开启事务，因为事务对性能影响较大

spring.xml配置文件

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<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
           
	<context:annotation-config />
	
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
		destroy-method="close">
		<property name="driverClassName" value="org.gjt.mm.mysql.Driver" />
		<property name="url"
			value="jdbc:mysql://localhost:3306/springAndHibernate?useUnicode=true&amp;characterEncoding=UTF-8" />
		<property name="username" value="root" />
		<property name="password" value="mysql" />
		<!-- 连接池启动时的初始值 -->
		<property name="initialSize" value="1" />
		<!-- 连接池的最大值 -->
		<property name="maxActive" value="500" />
		<!-- 最大空闲值.当经过一个高峰时间后，连接池可以慢慢将已经用不到的连接慢慢释放一部分，一直减少到maxIdle为止 -->
		<property name="maxIdle" value="2" />
		<!-- 最小空闲值.当空闲的连接数少于阀值时，连接池就会预申请去一些连接，以免洪峰来时来不及申请 -->
		<property name="minIdle" value="1" />
	</bean>

	<bean id="sessionFactory"
		class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<property name="mappingResources">
			<list>
				<value>org/spring/bean/Person.hbm.xml</value>
			</list>
		</property>
		<property name="hibernateProperties">
			<value>
				hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
				hibernate.hbm2ddl.auto=update
				hibernate.show_sql=false
				hibernate.format_sql=false
				hibernate.cache.use_second_level_cache=true
				hibernate.cache.use_query_cache=false
				hibernate.cache.provider_class=org.hibernate.cache.EhCacheProvider
			</value>
		</property>
	</bean>

	<bean id="txManager"
		class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>

	<tx:annotation-driven transaction-manager="txManager" />
	<bean id="personService" class="org.spring.service.impl.PersonServiceBean" />
</beans>

测试类

package org.spring.junit;

import java.util.List;

import org.junit.BeforeClass;
import org.junit.Test;
import org.spring.bean.Person;
import org.spring.service.PersonService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class PersonServiceTest {
	private static PersonService personService;

	@BeforeClass
	public static void setUpBeforeClass() throws Exception {
		try {
			ApplicationContext applicationContext = new ClassPathXmlApplicationContext(
					"spring.xml");
			personService = (PersonService) applicationContext
					.getBean("personService");
		} catch (RuntimeException e) {
			e.printStackTrace();
		}
	}

	@Test
	public void testSave() {
		personService.save(new Person("xxx"));
	}

	@Test
	public void testUpdate() {
		Person person = personService.getPerson(1);
		person.setName("zzz");
		personService.update(person);
	}

	@Test
	public void testGetPerson() {
		Person person = personService.getPerson(1);
		System.out.println(person.getName());
	}

	@Test
	public void testDelete() {
		personService.delete(1);
	}

	@Test
	public void testGetPersons() {
		List<Person> persons = personService.getPersons();
		for (Person person : persons) {
			System.out.println(person.getName());
		}
	}

}