Spring整合Hibernate加事务的处理

要在Spring中使用事务，先要在beans.xml中，把命名空间的名字和Location定义好，然后加一句话<tx:annotation-driven transaction-manager="txManager" />，接下来就是通过SessionFactory来获得txManager（最好查API），然后就可以通过AOP来处理事务（增强等）

 

beans.xml文件的配置

<?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/tx 
           http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
           http://www.springframework.org/schema/aop
           http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">
	<context:annotation-config />
	<context:component-scan base-package="com.lbx" />
	<tx:annotation-driven transaction-manager="txManager" />

	<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.lbx.model.User</value>
				<value>com.lbx.model.Log</value>
			</list>
		</property>
		 -->
		 <property name="packagesToScan">
			<list>
				<value>com.lbx.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="logDAO" class="com.lbx.dao.impl.LogDAOImpl">
		<property name="sessionFactory" ref="sessionFactory"></property>
	</bean>
	<bean id="u" class="com.lbx.dao.impl.UserDAOImpl">
		<property name="sessionFactory" ref="sessionFactory"></property>
	</bean>
	<bean id="userService" class="com.lbx.service.UserService">
		<property name="userDAO" ref="u"></property>
		<property name="logDAO" ref="logDAO"></property>
	</bean>

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

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

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

</beans>

 

 

此事务处理的是在Service层，add*的所有方法，看下面一段代码：

package com.lbx.service;

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


public class UserService {
	
	private UserDAO userDAO;  
	private LogDAO logDAO;
	
	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;
	}
	
	public void setUserDAO( UserDAO userDAO) {
		this.userDAO = userDAO;
	}
	
	public LogDAO getLogDAO() {
		return logDAO;
	}
	public void setLogDAO(LogDAO logDAO) {
		this.logDAO = logDAO;
	}
	
}

 

 

中有一个add（User user）的方法，但是此方法在增加User的情况下还要增加一个Log，而且要同步，然而此程序的事务又加在此方法上，一旦User的增加或者Log的增加出现了异常什么的，就都会回滚，这样就保证了事务的正常。