註解配置事務

註解配置事務就很簡單了
我們只需要激活@Transactional註解就可以了
然後在需要的事務前面加上@Transactional註解就可以了

<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 
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop 
        https://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
		https://www.springframework.org/schema/context/spring-context.xsd
		http://www.springframework.org/schema/tx 
		https://www.springframework.org/schema/tx/spring-tx.xsd">

		<context:component-scan base-package="jee.pk3"></context:component-scan>
    	<!-- 引入jdbc.properties -->
    	<context:property-placeholder location="jdbc.properties"/>
    	<!-- 配置dbcp數據庫 -->
    	<bean id="dataSource"
			class="org.apache.commons.dbcp2.BasicDataSource"
			destroy-method="close">
			<property name="driverClassName" value="${driverClassName}" />
			<property name="url" value="${url}" />
			<property name="username" value="${uName}" />
			<property name="password" value="${password}" />
			<property name="initialSize" value="3" />
		</bean>
		
		<!-- 事務管理器 -->
		<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
			<property name="dataSource" ref="dataSource"></property>
		</bean>
		
		
		<!-- 激活@Transactional註解，始終使用cglib動態代理 -->
		<tx:annotation-driven proxy-target-class="true"/>	
</beans>

需要事務的類

package jee.pk3;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.transaction.support.TransactionCallbackWithoutResult;
import org.springframework.transaction.support.TransactionTemplate;

@Component("userService")
public class UserServiceImpl implements UserService {

	
	private UserDao userDao;
	
	@Autowired
   public void setUserDao(UserDao userDao) {
		this.userDao = userDao;
	}
	
	
	
	@Override
	//參數爲配置文件中事務管理器的名字，默認使用id=transactionManager  的事務管理器
	@Transactional(transactionManager  = "txManager")//此方法在事務中執行
	public void remove() {
		
		userDao.delete(3);
		if(1==1)
		{
			throw new RuntimeException("某個錯誤");
		}
		userDao.delete(2);
		
		
	}

}