Spring 事务配置

<?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:util="http://www.springframework.org/schema/util"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
         http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
         http://www.springframework.org/schema/util 
http://www.springframework.org/schema/util/spring-util-2.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd
         ">
    <bean id="dataSource"
        class="com.mchange.v2.c3p0.ComboPooledDataSource"
        destroy-method="close">
        <property name="driverClass" value="com.mysql.jdbc.Driver" />
        <property name="jdbcUrl"
            value="jdbc:mysql://127.0.0.1:3306/mydata" />
        <property name="user" value="root" />
        <property name="password" value="root" />
        <property name="autoCommitOnClose" value="true" />
        <property name="checkoutTimeout" value="5000" />
        <property name="initialPoolSize" value="2" />
        <property name="minPoolSize" value="2" />
        <property name="maxPoolSize" value="4" />
        <property name="maxIdleTime" value="25200" />
        <property name="acquireIncrement" value="1800" />
        <property name="maxIdleTimeExcessConnections" value="5" />
    </bean>
    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="mappingDirectoryLocations">
            <list>
                <value>classpath:/hvp/spring/hibernate/orm/</value>
            </list>
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">
                    org.hibernate.dialect.MySQLDialect
                </prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hibernate.generate_statistics">true</prop>
            </props>
        </property>
    </bean>
    <bean id="hibernateTemplate"
        class="org.springframework.orm.hibernate3.HibernateTemplate">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>
    <bean id="userDAO" class="hvp.spring.hibernate.orm.UserDAO">
        <property name="hibernateTemplate" ref="hibernateTemplate" />
    </bean>
    <bean id="purDAO" class="hvp.spring.hibernate.orm.PurDAO">
        <property name="hibernateTemplate" ref="hibernateTemplate" />
    </bean>

    <bean id="service" class="hvp.spring.hibernate.orm.Services">
        <property name="userDAO" ref="userDAO" />
        <property name="purDAO" ref="purDAO" />
    </bean>
    <bean id="transactionManager"
        class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>
    <tx:annotation-driven />
</beans>