@Transactional

事务管理一般有编程式和声明式两种，编程式是直接在代码中进行编写事物处理过程，而声名式则是通过注解方式或者是在xml文件中进行配置，相对编程式很方便

<?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:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">

JDBC事务

<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
 </bean>
<tx:annotation-driven transaction-manager="transactionManager" />

Hibernate事务

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

JPA事务

<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
    </bean>
<tx:annotation-driven transaction-manager="transactionManager" />

Java原生API事务

<bean id="transactionManager" class="org.springframework.transaction.jta.JtaTransactionManager">
        <property name="transactionManagerName" value="java:/TransactionManager" />
    </bean>
<tx:annotation-driven transaction-manager="transactionManager" />

spring所有的事务管理策略类都继承自org.springframework.transaction.PlatformTransactionManager接口
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