就像前面AOP等部分介绍的,spring在实现AOP时提供了注解和xml配置两种方式。同样,配置事务管理,也可以使用xml文件配置。
这里我们将前面的例子重新复制一份,在tx2包中。
我们把注解全去掉,这里挑一个吧。
package com.happBKs.spring.tx2; public interface BookShopDao { //根据书号获取书的单价 public int findBookPriceIsdn(String isbn); //更新书的库存,使得书号对应的库存-1 public void updateBookStock(String isbn); //更新用户的账户余额:使得相应username记录的balance-price public void updateUserAccount(String username,int price); }
package com.happBKs.spring.tx2; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.stereotype.Repository; public class BookShopDaoImpl implements BookShopDao { private JdbcTemplate jdbcTemplate; public void setJdbcTemplate(JdbcTemplate jdbcTemplate) { this.jdbcTemplate = jdbcTemplate; } public int findBookPriceIsdn(String isbn) { // TODO Auto-generated method stub String sql="select price from book where isbn = ?"; return jdbcTemplate.queryForObject(sql, Integer.class,isbn); } public void updateBookStock(String isbn) { String sql0="select stock from book_stock where isbn = ?"; int stock=jdbcTemplate.queryForObject(sql0,Integer.class, isbn); if(stock==0) { throw new RuntimeException("库存不足!"); } // TODO Auto-generated method stub String sql="update book_stock set stock = stock-1 where isbn = ?"; jdbcTemplate.update(sql,isbn); } public void updateUserAccount(String username, int price) { String sql0="select balance from account where username = ?"; int balance=jdbcTemplate.queryForObject(sql0,Integer.class, username); if(balance<price) { throw new RuntimeException("余额不足!"); } // TODO Auto-generated method stub String sql="update account set balance = balance - ? where username = ?"; jdbcTemplate.update(sql,price,username); } }
<?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:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd 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-4.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd"> <!-- 自动扫描的包 --> <context:component-scan base-package="com.happBKs.spring.jdbcSpring"></context:component-scan> <context:component-scan base-package="com.happBKs.spring.tx"></context:component-scan> <!-- 导入资源文件 --> <context:property-placeholder location="classpath:db.properties" /> <!-- 配置c3p0数据源 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"> <property name="user" value="${jdbc.user}"></property> <property name="password" value="${jdbc.password}"></property> <property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property> <property name="driverClass" value="${jdbc.driverClass}"></property> <property name="initialPoolSize" value="${jdbc.initPoolSize}"></property> <property name="maxPoolSize" value="${jdbc.maxPoolSize}"></property> </bean> <!-- 配置jdbc模板类 --> <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"> <property name="dataSource" ref="dataSource"></property> </bean> <!-- 配置bean --> <bean id="bookShopDao" class="com.happBKs.spring.tx2.BookShopDaoImpl"> <property name="jdbcTemplate" ref="jdbcTemplate"></property> </bean> <bean id="bookShopService" class="com.happBKs.spring.tx2.BookShopServiceImpl"> <property name="bookShopDao" ref="bookShopDao"></property> </bean> <bean id="cashier" class="com.happBKs.spring.tx2.CashierImpl"> <property name="bookShopService" ref="bookShopService"></property> </bean> <!-- 1. 配置事务管理器。以后集成Hibernate、Mybatis需要配置不同的事务管理器 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"></property> </bean> <!-- 2. 配置事务属性。传播行为、隔离级别、只读、超时时间回滚--> <tx:advice id="txAdvice" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="purchase" propagation="REQUIRED"/> <tx:method name="get*" read-only="true"/> <tx:method name="*" /> </tx:attributes> </tx:advice> <!-- 2. 配置事务切入点。并把事务切入点与事务属性关联起来。--> <aop:config> <aop:pointcut expression="execution(* com.happBKs.spring.tx2.BookShopDaoImpl.*(..))" id="txPointCut"/> <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/> </aop:config> </beans>
测试程序:
package com.happBKs.spring.tx2; import java.util.Arrays; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class TransactionTest { private ApplicationContext ctx=null; private BookShopDao bookShopDao; private BookShopService bookShopService; private Cashier cashier=null; { ctx=new ClassPathXmlApplicationContext("applicationContext_xml.xml"); bookShopDao=ctx.getBean(BookShopDao.class); bookShopService=ctx.getBean(BookShopService.class); cashier=ctx.getBean(Cashier.class); } @Test public void test1(){ System.out.println(bookShopDao.findBookPriceIsdn("1001")); } @Test public void test2(){ bookShopDao.updateBookStock("1001"); } @Test public void test3(){ bookShopDao.updateUserAccount("HappyBKs", 100); } }
时间: 2024-09-29 19:05:07