Spring_使用XML文件的方式配置事务

package com.spring.bean;

public interface BookShopDao {

    //根据书号获取书的单价
    int findBookPriceByIsbn(String isbn);
    
    更新数的库存. 使书号对应的库存 - 1
    void updateBookStock(String isbn);
    
    更新用户的账户余额: 使 username 的 balance - price
    void updateUserAccount(String username, price);
}

import org.springframework.jdbc.core.JdbcTemplate;

class BookShopDaoImpl implementsprivate JdbcTemplate jdbcTemplate;
    
     setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }
    
     findBookPriceByIsbn(String isbn) {
        String sql = "SELECT price FROM book WHERE isbn = ?";
        return jdbcTemplate.queryForObject(sql,Integer.class,isbn);
    }

    @Override
     updateBookStock(String isbn) {
        检查书的库存是否足够,若不够,则抛出异常
        String sql2 = "SELECT stock FROM book_stock WHERE isbn = ?"int stock = jdbcTemplate.queryForObject(sql2,isbn);
        if(stock == 0){
            throw new BookStockException("库存不足!");
        }
        
        String sql = "UPDATE book_stock SET stock = stock -1 WHERE isbn = ?";
        jdbcTemplate.update(sql,1)"> price) {
        验证余额是否足够,若不足,则抛出异常
        String sql2 = "SELECT balance FROM account WHERE username = ?"int balance = jdbcTemplate.queryForObject(sql2,username);
        if(balance < price){
            new UserAccountException("余额不足!");
        }
        
        String sql = "UPDATE account SET balance = balance - ? WHERE username = ?"
 BookShopService {
    
     purchase(String username,String isbn);
    
}

class BookShopServiceImpl  BookShopService {

     BookShopDao bookShopDao;
     setBookShopDao(BookShopDao bookShopDao) {
        this.bookShopDao = bookShopDao;
    }
    @Override
    try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {}
        
        1. 获取书的单价
        int price = bookShopDao.findBookPriceByIsbn(isbn);
        
        2. 更新数的库存
        bookShopDao.updateBookStock(isbn);
        
        3. 更新用户余额
        bookShopDao.updateUserAccount(username,price);
    }

}

 java.util.List;

 Cashier {

    void checkout(String username,List<String> isbns);
    
}

class CashierImpl  BookShopService bookShopService;
     setBookShopService(BookShopService bookShopService) {
        this.bookShopService = bookShopService;
    }
    @Override
     isbns) {
        for(String isbn: isbns){
            bookShopService.purchase(username,isbn);
        }
    }

}

<?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-4.0.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-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
    
    
    <!-- 导入资源文件 -->
    context:property-placeholder location="classpath:db.properties"/>
    
     配置 mysql 数据源 bean id="dataSource"
        class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        property name="username" value="${jdbc.user}"></property="password"="${jdbc.password}"="url"="${jdbc.jdbcUrl}"="driverClassName"="${jdbc.driverClass}">
    </bean>
    
     配置 Spirng 的 JdbcTemplate ="jdbcTemplate" 
        class="org.springframework.jdbc.core.JdbcTemplate" ref="dataSource" 配置 NamedParameterJdbcTemplate,该对象可以使用具名参数,其没有无参数的构造器,所以必须为其构造器指定参数 ="namedParameterJdbcTemplate"="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate"constructor-arg refconstructor-arg>    
     配置bean ="bookShopDao" class="com.spring.bean.BookShopDaoImpl"="jdbcTemplate"="bookShopService"="com.spring.bean.BookShopServiceImpl"="bookShopDao"="cashier"="com.spring.bean.CashierImpl"="bookShopService" 配置事务管理器 ="transactionManager"="org.springframework.jdbc.datasource.DataSourceTransactionManager" 配置事物属性 tx:advice ="txadvice" transaction-manager="transactionManager"tx:attributes>
            tx:method ="purchase" propagation="REQUIRES_NEW"/>
            ="find*" read-only="true"/>
        tx:advice 配置事物切入点,把事物通过切入点连接起来 aop:configaop:pointcut expression="execution(* com.spring.bean.*.*(..))" 
            id="txPointCut"aop:advisor advice-ref pointcut-ref/>    
    >
     <aop:config>
        <aop:pointcut expression=" execution(* com.spring.bean.* . *(..))" id="pointcut"/>
        <aop:advisor advice-ref="txadvice" pointcut-ref="pointcut"/>
    </aop:config> -->
    
beans>