4.2 Spring的事物管理

4.2.1 Spring事物管理API

（1）事物管理器介面

常用的實現類：

DataSourceTransactionManager

Spring的回滾方式，發生執行時異常回滾，發生受查異常提交。

受查異常可以丟擲，或者try，catch

執行時異常直接掛掉，更嚴重。

（2）事物定義介面

4.2.2

事先定義Service，從上往下寫，從需求開始寫 。

將事物從dao層提升到service層

4.2.3 使用Spring的事物代理工廠類

<?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" xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context.xsd">
	
	<!-- ================================= IoC ==================================== -->
	
	<!-- 註冊資料來源：C3P0 -->
	<bean id="myDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<property name="driverClass" value="${jdbc.driver}"/>
		<property name="jdbcUrl" value="${jdbc.url}"/>
		<property name="user" value="${jdbc.user}"/>
		<property name="password" value="${jdbc.password}"/>
	</bean>
	
	<!-- 註冊屬性檔案 -->
	<context:property-placeholder location="classpath:jdbc.properties"/>
	
	<!-- 註冊Dao -->
	<bean id="accountDao" class="com.bjpowernode.dao.AccountDaoImpl">
		<property name="dataSource" ref="myDataSource"/>
	</bean>
	<bean id="stockDao" class="com.bjpowernode.dao.StockDaoImpl">
		<property name="dataSource" ref="myDataSource"/>
	</bean>
	
	<!-- 註冊Service -->
	<bean id="buyStockService" class="com.bjpowernode.service.BuyStockServiceImpl">
		<property name="adao" ref="accountDao"/>
		<property name="sdao" ref="stockDao"/>
	</bean>

	<!-- ================================= AOP ==================================== -->
	
	<!-- 註冊事務管理器 -->
	<bean id="myTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="myDataSource"/>
	</bean>
	
	<!-- 生成事務代理物件 -->
	<bean id="serviceProxy" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
		<property name="transactionManager" ref="myTransactionManager"/>
		<property name="target" ref="buyStockService"/>
		<property name="transactionAttributes">
			<props>
				<prop key="open*">ISOLATION_DEFAULT,PROPAGATION_REQUIRED</prop>
				<!-- 
					-異常：表示發生指定異常後回滾，這時的異常通常是受查異常
					+異常：表示發生指定異常後提交，這時的異常通常是執行時異常
				 -->
				<prop key="buyStock">ISOLATION_DEFAULT,PROPAGATION_REQUIRED, -BuyStockException</prop>
			</props>
		</property>
	</bean>
</beans>
 

4.2.5 使用AspectJ的AOP配置管理實務

<?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.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop.xsd">
	
	<!-- ================================= IoC ==================================== -->
	
	<!-- 註冊資料來源：C3P0 -->
	<bean id="myDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<property name="driverClass" value="${jdbc.driver}"/>
		<property name="jdbcUrl" value="${jdbc.url}"/>
		<property name="user" value="${jdbc.user}"/>
		<property name="password" value="${jdbc.password}"/>
	</bean>
	
	<!-- 註冊屬性檔案 -->
	<context:property-placeholder location="classpath:jdbc.properties"/>
	
	<!-- 註冊Dao -->
	<bean id="accountDao" class="com.bjpowernode.dao.AccountDaoImpl">
		<property name="dataSource" ref="myDataSource"/>
	</bean>
	<bean id="stockDao" class="com.bjpowernode.dao.StockDaoImpl">
		<property name="dataSource" ref="myDataSource"/>
	</bean>
	
	<!-- 註冊Service -->
	<bean id="buyStockService" class="com.bjpowernode.service.BuyStockServiceImpl">
		<property name="adao" ref="accountDao"/>
		<property name="sdao" ref="stockDao"/>
	</bean>

	<!-- ================================= AOP ==================================== -->
	
	<!-- 註冊事務管理器 -->
	<bean id="myTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="myDataSource"/>
	</bean>
	
	<!-- 註冊事務通知 -->
	<tx:advice id="txAdvice" transaction-manager="myTransactionManager">
		<tx:attributes>
			<!-- 這裡指定的是：為每一個連線點指定所要應用的事務屬性 -->
			<tx:method name="open*" isolation="DEFAULT" propagation="REQUIRED"/>
			<tx:method name="buyStock" isolation="DEFAULT" propagation="REQUIRED" rollback-for="BuyStockException"/>
		</tx:attributes>
	</tx:advice>
	
	<!-- AOP配置 -->
	<aop:config>
		<!-- 這裡指定的是切入點 -->
		<aop:pointcut expression="execution(* *..service.*.*(..))" id="myPointcut"/>
		<aop:advisor advice-ref="txAdvice" pointcut-ref="myPointcut"/>
	</aop:config>
</beans>