Spring-Transactions-事务控制XML版

* 上一篇文章已经做了入门介绍：https://blog.csdn.net/Shen_R/article/details/105216907

* 接下来介绍XML版本的控制写法：

jdbc.user=root
jdbc.password=root
jdbc.jdbcUrl=jdbc:mysql://localhost:3306/tx
jdbc.driverClass=com.mysql.jdbc.Driver

import com.atguigu.service.BookService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TxTest {

    ApplicationContext ioc = new ClassPathXmlApplicationContext("spring-config.xml");

    @Test
    public void test(){
        BookService bookService = ioc.getBean(BookService.class);
        bookService.checkout("Tom","ISBN-001");
        System.out.println("结账完成！");
    }
}

package com.atguigu.dao;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

public class BookDao {

    JdbcTemplate jdbcTemplate;

    public void updateBalance(String userName, double price){
        String sql = "UPDATE account SET balance = balance - ? WHERE username = ?";
        jdbcTemplate.update(sql, price, userName);
    }


    public Double getPrice(String isbn){
        String sql = "SELECT price FROM book WHERE isbn = ?";
        return jdbcTemplate.queryForObject(sql, Double.class, isbn);
    }


    public void updateStock(String isbn){
        String sql = "UPDATE book_stock SET stock = stock-1 WHERE isbn = ?";
        jdbcTemplate.update(sql, isbn);
    }

}

package com.atguigu.service;

import com.atguigu.dao.BookDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.io.FileNotFoundException;

public class BookService {

    @Autowired
    BookDao bookDao;

    public void checkout(String username, String isbn){
//        第一步：减库存
        bookDao.updateStock(isbn);
//        第二步：减余额，先查询图书价格
        Double price = bookDao.getPrice(isbn);
        bookDao.updateBalance(username, price);
    }

}