spring--(25)聲明式事務

接上篇配置，在com.test.spring.tx包下加入業務接口和類
####業務接口類

public interface BookShopService {
	
	public void purchase(int userId,int bookId);
}

####業務實現類，注意添加有事務

package com.test.spring.tx;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service("bookShopService")
public class BookShopServiceImpl implements BookShopService{

	@Autowired
	private BookShopDao bookShopDao;
	
	//聲明式事務
	@Transactional
	@Override
	public void purchase(int userId, int bookId) {
		
		//1.獲取書的單價
		double price = bookShopDao.getBookPriceByBookId(bookId);
		//2.更新書的數量
		bookShopDao.updateBookStock(bookId);
		//3.更新用戶餘額
		bookShopDao.updateUserBalance(userId, price);
	}

}

####測試類

package com.test.spring.tx;


import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestTx {
	
	private ApplicationContext ctx;
	private BookShopService bookShopService;
	
	{
		ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
		bookShopService = ctx.getBean(BookShopService.class);
	}
	
	@Test
	public void testBookService(){
		
		bookShopService.purchase(1000, 1001);
	}

}

####配置文件

<context:component-scan base-package="com.test.spring.tx"></context:component-scan>
	
	<context:property-placeholder location="classpath:db.properties"/>
	
			<!-- 配置數據源 -->
		<bean id="dataSources" class="com.mchange.v2.c3p0.ComboPooledDataSource">
			<property name="user" value="${jdbc.user}"></property>
			<property name="password" value="${jdbc.password}"></property>
			<property name="driverClass" value="${jdbc.driverClass}"></property>
			<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
			
			<property name="initialPoolSize" value="${jdbc.initPoolSize}"></property>
			<property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property>
		</bean>
		

		<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
			<property name="dataSource" ref="dataSources"></property>
		</bean>
		
		<!-- 配置事物管理器 -->
		<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
			<property name="dataSource" ref="dataSources"></property>
		</bean>
		
		<!-- 啓用事物註解 -->
		<tx:annotation-driven transaction-manager="transactionManager"/>