业务层框架spring(事务管理)

package com.atguigu.spring.tx;

public class UserAccountException extends RuntimeException{

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	public UserAccountException() {
		super();
		// TODO Auto-generated constructor stub
	}

	public UserAccountException(String message, Throwable cause,
			boolean enableSuppression, boolean writableStackTrace) {
		super(message, cause, enableSuppression, writableStackTrace);
		// TODO Auto-generated constructor stub
	}

	public UserAccountException(String message, Throwable cause) {
		super(message, cause);
		// TODO Auto-generated constructor stub
	}

	public UserAccountException(String message) {
		super(message);
		// TODO Auto-generated constructor stub
	}

	public UserAccountException(Throwable cause) {
		super(cause);
		// TODO Auto-generated constructor stub
	}

	
	
}

package com.atguigu.spring.tx;

public class BookStockException extends RuntimeException{

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	public BookStockException() {
		super();
		// TODO Auto-generated constructor stub
	}

	public BookStockException(String message, Throwable cause,
			boolean enableSuppression, boolean writableStackTrace) {
		super(message, cause, enableSuppression, writableStackTrace);
		// TODO Auto-generated constructor stub
	}

	public BookStockException(String message, Throwable cause) {
		super(message, cause);
		// TODO Auto-generated constructor stub
	}

	public BookStockException(String message) {
		super(message);
		// TODO Auto-generated constructor stub
	}

	public BookStockException(Throwable cause) {
		super(cause);
		// TODO Auto-generated constructor stub
	}

	
}

package com.atguigu.spring.tx;
//书店接口
public interface BookShopDao {

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

package com.atguigu.spring.tx;

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

@Repository("bookShopDao")
public class BookShopDaoImpl implements BookShopDao {

	@Autowired
	private JdbcTemplate jdbcTemplate;
	
    //根据书号获取书的单价
	@Override
	public int findBookPriceByIsbn(String isbn) {
		String sql = "SELECT price FROM book WHERE isbn = ?";
		return jdbcTemplate.queryForObject(sql, Integer.class, isbn);
	}

    //更新数的库存. 使书号对应的库存 - 1
	@Override
	public void 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, Integer.class, 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, isbn);
	}

    //更新用户的账户余额: 使 username 的 balance - price
	@Override
	public void updateUserAccount(String username, int 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, Integer.class, username);
		if(balance < price){
			throw new UserAccountException("余额不足!");
		}
		
		String sql = "UPDATE account SET balance = balance - ? WHERE username = ?";
		jdbcTemplate.update(sql, price, username);
	}

}

package com.atguigu.spring.tx;

public interface BookShopService {
	//采购，传入用户名和书号
	public void purchase(String username, String isbn);
	
}

package com.atguigu.spring.tx;

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

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

	@Autowired
	private BookShopDao bookShopDao;
	
	//添加事务注解
	//1.使用 propagation 指定事务的传播行为, 即当前的事务方法被另外一个事务方法调用时
	//如何使用事务, 默认取值为 REQUIRED, 即使用调用方法的事务
	//REQUIRES_NEW: 事务自己的事务, 调用的事务方法的事务被挂起. 
	//2.使用 isolation 指定事务的隔离级别, 最常用的取值为 READ_COMMITTED
	//3.默认情况下 Spring 的声明式事务对所有的运行时异常进行回滚. 也可以通过对应的
	//属性进行设置. 通常情况下去默认值即可. 
	//4.使用 readOnly 指定事务是否为只读. 表示这个事务只读取数据但不更新数据, 
	//这样可以帮助数据库引擎优化事务. 若真的事一个只读取数据库值的方法, 应设置 readOnly=true
	//5.使用 timeout 指定强制回滚之前事务可以占用的时间.  
//	@Transactional(propagation=Propagation.REQUIRES_NEW,
//			isolation=Isolation.READ_COMMITTED,
//			noRollbackFor={UserAccountException.class})
	@Transactional(propagation=Propagation.REQUIRES_NEW,
			isolation=Isolation.READ_COMMITTED,
			readOnly=false,
			timeout=3)
	@Override
	public void purchase(String username, String isbn) {
		
		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);
	}

}

package com.atguigu.spring.tx;

import java.util.List;
//用户购买书籍接口
public interface Cashier {
	//结账方法，传入用户名和购买图书的书号集合
	public void checkout(String username, List<String> isbns);
	
}

package com.atguigu.spring.tx;

import java.util.List;

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

@Service("cashier")
public class CashierImpl implements Cashier {

	@Autowired
	private BookShopService bookShopService;
	
	@Transactional
	@Override
	public void checkout(String username, List<String> isbns) {
        //循环购买书籍
		for(String isbn: isbns){
			bookShopService.purchase(username, isbn);
		}
	}

}

package com.atguigu.spring.tx;

import static org.junit.Assert.*;

import java.util.Arrays;

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

public class SpringTransactionTest {

	private ApplicationContext ctx = null;
	private BookShopDao bookShopDao = null;
	private BookShopService bookShopService = null;
	private Cashier cashier = null;
	
	{
		ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
		bookShopDao = ctx.getBean(BookShopDao.class);
		bookShopService = ctx.getBean(BookShopService.class);
		cashier = ctx.getBean(Cashier.class);
	}
	
	@Test
	public void testTransactionlPropagation(){
		cashier.checkout("AA", Arrays.asList("1001", "1002"));
	}
	
	@Test
	public void testBookShopService(){
		bookShopService.purchase("AA", "1001");
	}
	
	@Test
	public void testBookShopDaoUpdateUserAccount(){
		bookShopDao.updateUserAccount("AA", 200);
	}
	
	@Test
	public void testBookShopDaoUpdateBookStock(){
		bookShopDao.updateBookStock("1001");
	}
	
	@Test
	public void testBookShopDaoFindPriceByIsbn() {
		System.out.println(bookShopDao.findBookPriceByIsbn("1001"));
	}

}

package com.atguigu.spring.tx.xml;

import org.springframework.jdbc.core.JdbcTemplate;

public class BookShopDaoImpl implements BookShopDao {

	private JdbcTemplate jdbcTemplate;
	
	public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
		this.jdbcTemplate = jdbcTemplate;
	}
	
	@Override
	public int findBookPriceByIsbn(String isbn) {
		String sql = "SELECT price FROM book WHERE isbn = ?";
		return jdbcTemplate.queryForObject(sql, Integer.class, isbn);
	}

	@Override
	public void 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, Integer.class, 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, isbn);
	}

	@Override
	public void updateUserAccount(String username, int 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, Integer.class, username);
		if(balance < price){
			throw new UserAccountException("余额不足!");
		}
		
		String sql = "UPDATE account SET balance = balance - ? WHERE username = ?";
		jdbcTemplate.update(sql, price, username);
	}

}

package com.atguigu.spring.tx.xml.service.impl;

import com.atguigu.spring.tx.xml.BookShopDao;
import com.atguigu.spring.tx.xml.service.BookShopService;


public class BookShopServiceImpl implements BookShopService {

	private BookShopDao bookShopDao;
	
	public void setBookShopDao(BookShopDao bookShopDao) {
		this.bookShopDao = bookShopDao;
	}
	
	@Override
	public void purchase(String username, String isbn) {
		
		try {
			Thread.sleep(1000);
		} 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);
	}

}

package com.atguigu.spring.tx.xml.service.impl;

import java.util.List;

import com.atguigu.spring.tx.xml.service.BookShopService;
import com.atguigu.spring.tx.xml.service.Cashier;

public class CashierImpl implements Cashier {

	private BookShopService bookShopService;
	
	public void setBookShopService(BookShopService bookShopService) {
		this.bookShopService = bookShopService;
	}
	
	@Override
	public void checkout(String username, List<String> isbns) {
		for(String isbn: isbns){
			bookShopService.purchase(username, isbn);
		}
	}

}

package com.atguigu.spring.tx.xml;

import java.util.Arrays;

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

import com.atguigu.spring.tx.xml.service.BookShopService;
import com.atguigu.spring.tx.xml.service.Cashier;

public class SpringTransactionTest {

	private ApplicationContext ctx = null;
	private BookShopDao bookShopDao = null;
	private BookShopService bookShopService = null;
	private Cashier cashier = null;
	
	{
		ctx = new ClassPathXmlApplicationContext("applicationContext-tx-xml.xml");
		bookShopDao = ctx.getBean(BookShopDao.class);
		bookShopService = ctx.getBean(BookShopService.class);
		cashier = ctx.getBean(Cashier.class);
	}
	
	@Test
	public void testTransactionlPropagation(){
		cashier.checkout("AA", Arrays.asList("1001", "1002"));
	}
	
	@Test
	public void testBookShopService(){
		bookShopService.purchase("AA", "1001");
	}
	
}