sping 对 hibernate进行事务管理--Annotation, xml, 大多数使用XML

1. UserServiceTest.java:

package com.bjsxt.service;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.bjsxt.model.User;

//Dependency Injection
//Inverse of Control
public class UserServiceTest {

	@Test 
	public void testAdd() throws Exception {
		ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");		
		UserService service = (UserService)ctx.getBean("userService");
		System.out.println(service.getClass());
		User user=new User();
		user.setName("zhangsdddn");
		service.add(user);		
		ctx.destroy();		
	}
}

2. src下 beas.xml: 注意tx的引入, properties->XML Catalog, 引入spring-tx-2.5.xsd　　

<?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 />
	<context:component-scan base-package="com.bjsxt" />
	<!-- 
		<bean id="dataSource"
		class="org.apache.commons.dbcp.BasicDataSource"
		destroy-method="close">		
		<property name="driverClassName" value="com.mysql.jdbc.Driver" />
		<property name="url" value="jdbc:mysql://localhost:3306/spring" />
		<property name="username" value="root" />
		<property name="password" value="bjsxt" />
		</bean>
	-->

	<bean
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
			<value>classpath:jdbc.properties</value>
		</property>
	</bean>

	<bean id="dataSource" destroy-method="close"
		class="org.apache.commons.dbcp.BasicDataSource">
		<property name="driverClassName"
			value="${jdbc.driverClassName}" />
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
	</bean>
	<bean id="sessionFactory"
		class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<property name="annotatedClasses">
			<list>
				<value>com.bjsxt.model.User</value>
				<value>com.bjsxt.model.Log</value>
			</list>
		</property>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">
					org.hibernate.dialect.MySQLDialect
				</prop>
				<prop key="hibernate.show_sql">true</prop>
			</props>
		</property>
	</bean>

	<bean id="txManager"
		class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>
	
	<tx:annotation-driven transaction-manager="txManager"/>
</beans>

3. src下jdbc.properties

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/spring
jdbc.username=root
jdbc.password=linda0213

4. UserService.java:

新增一个业务逻辑log, 如果加入一个user出错, 那么log也要保证回滚, 所以要通过beans.xml配置和UserService.java里的add方法上加入@Transactional, 来进行统一事务管理

Transactional有个属性propagation, 是个Enum, 默认值是REQUIRED, 

@Transactional(propagation=Propagation.REQUIRED)

@Transactional(readOnly=true), 不能修改, 没有修改的时候, 可以用, 效率高

package com.bjsxt.service;
import javax.annotation.Resource;

import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;

import com.bjsxt.dao.LogDAO;
import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.Log;
import com.bjsxt.model.User;

@Component("userService")
public class UserService {	
	private UserDAO userDAO;
	private LogDAO logDAO;	
	public void init() {
		System.out.println("init");
	}
	
	public User getUser(int id) {
		return null;
	}
	
	@Transactional
	public void add(User user) {
		
			userDAO.save(user);
			Log log = new Log();
			log.setMsg("a user saved!");
			logDAO.save(log);		
	}
	public UserDAO getUserDAO() {
		return userDAO;
	}
	
	@Resource(name="u")
	public void setUserDAO( UserDAO userDAO) {
		this.userDAO = userDAO;
	}
	
	public LogDAO getLogDAO() {
		return logDAO;
	}	
	@Resource
	public void setLogDAO(LogDAO logDAO) {
		this.logDAO = logDAO;
	}
	public void destroy() {
		System.out.println("destroy");
	}
}

UserDAOImpl.java:

去掉save里的事务处理

package com.bjsxt.dao.impl;

import java.sql.SQLException;

import javax.annotation.Resource;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.stereotype.Component;

import com.bjsxt.dao.UserDAO;
import com.bjsxt.model.User;

@Component("u") 
public class UserDAOImpl implements UserDAO {

	private SessionFactory sessionFactory;

	public SessionFactory getSessionFactory() {
		return sessionFactory;
	}
	
	@Resource
	public void setSessionFactory(SessionFactory sessionFactory) {
		this.sessionFactory = sessionFactory;
	}
	public void save(User user) {		
			Session s = sessionFactory.getCurrentSession();			
			s.save(user);			
		//throw new RuntimeException("exeption!");
	}
}

　　

LogDAOImpl.java:

package com.bjsxt.dao.impl;

import javax.annotation.Resource;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.stereotype.Component;

import com.bjsxt.dao.LogDAO;
import com.bjsxt.model.Log;

@Component("logDAO") 
public class LogDAOImpl implements LogDAO {

	private SessionFactory sessionFactory;

	public SessionFactory getSessionFactory() {
		return sessionFactory;
	}
	
	@Resource
	public void setSessionFactory(SessionFactory sessionFactory) {
		this.sessionFactory = sessionFactory;
	}

	public void save(Log log) {		
		Session s = sessionFactory.getCurrentSession();
		s.save(log);
		//throw new RuntimeException("error!");
	}
}

UserDAO.java:

package com.bjsxt.dao;
import com.bjsxt.model.User;


public interface UserDAO {
	public void save(User user);
}

LogDAO.java:

package com.bjsxt.dao;
import com.bjsxt.model.User;


public interface UserDAO {
	public void save(User user);
}

User.java

package com.bjsxt.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;


@Entity
public class User {
	private int id;
	private String name;
	
	@Id
	@GeneratedValue
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	
}

　　

Log.java:

package com.bjsxt.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;


@Entity
public class User {
	private int id;
	private String name;
	
	@Id
	@GeneratedValue
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	
}

　　

大多数使用xml方式, 因为不用在service每个方法上加@Transactional

xml配置的话, 只需要把service里的@Transactional去掉,

然后修改beans.xml:

<?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 />
	<context:component-scan base-package="com.bjsxt" />

	<!-- 
		<bean id="dataSource"
		class="org.apache.commons.dbcp.BasicDataSource"
		destroy-method="close">
		
		
		<property name="driverClassName" value="com.mysql.jdbc.Driver" />
		<property name="url" value="jdbc:mysql://localhost:3306/spring" />
		<property name="username" value="root" />
		<property name="password" value="bjsxt" />
		</bean>
	-->

	<bean
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
			<value>classpath:jdbc.properties</value>
		</property>
	</bean>

	<bean id="dataSource" destroy-method="close"
		class="org.apache.commons.dbcp.BasicDataSource">
		<property name="driverClassName"
			value="${jdbc.driverClassName}" />
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
	</bean>

	<bean id="sessionFactory"
		class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<!-- 
		<property name="annotatedClasses">
			<list>
				<value>com.bjsxt.model.User</value>
				<value>com.bjsxt.model.Log</value>
			</list>
		</property>
		 -->
		 <property name="packagesToScan">
			<list>
				<value>com.bjsxt.model</value>
				
			</list>
		</property>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">
					org.hibernate.dialect.MySQLDialect
				</prop>
				<prop key="hibernate.show_sql">true</prop>
			</props>
		</property>
	</bean>

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

	<aop:config>
		<aop:pointcut id="bussinessService"
			expression="execution(public * com.bjsxt.service..*.*(..))" />
		<aop:advisor pointcut-ref="bussinessService"
			advice-ref="txAdvice" />
	</aop:config>

	<tx:advice id="txAdvice" transaction-manager="txManager">
		<tx:attributes>
			<tx:method name="getUser" read-only="true" />
			<tx:method name="add*" propagation="REQUIRED"/>
		</tx:attributes>
	</tx:advice>
</beans>

　　

<property name="annotatedClasses">
	<list>
		<value>com.bjsxt.model.User</value>
		<value>com.bjsxt.model.Log</value>
	</list>
</property>
用下面的替代:
 <property name="packagesToScan">
	<list>
		<value>com.bjsxt.model</value>
	</list>
</property>