【Spring】23 使用XML文件的方式配置事務

BookShopDao.java(com.test.spring.xml.BookShopDao)

package com.test.spring.xml;

public interface BookShopDao {

    // 根據書號獲取書的單價
    public int findBookPriceByIsbn(String isbn);

    // 跟新書的庫存，使書號對應的庫存 -1
    public void updateBookStock(String isbn);

    // 更新用戶的賬戶餘額：使 username 的 balance - price
    public void updateUserAccount(String username, int price);

}

BookShopDaoImpl.java(com.test.spring.xml.BookShopDaoImpl)

package com.test.spring.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) {
        // 檢查書的庫存是否足夠，若不夠，拋出異常
        String sql2 = "SELECT stock FROM book_stock WHERE isbn = ?";
        int stock = jdbcTemplate.queryForObject(sql2, Integer.class, isbn);
        if (stock == 0) {
            throw new BookStockException("庫存不足！");
        }

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

    @Override
    public void updateUserAccount(String username, int price) {
        // 檢查餘額是否足夠，若不夠，拋出異常
        String sql2 = "SELECT balance FROM account WHERE username = ?";
        int balance = jdbcTemplate.queryForObject(sql2, Integer.class, username);
        if (balance < price) {
            throw new UserAccountException("餘額不足！");
        }

        String sql = "UPDATE account SET balance = balance - ? WHERE username = ?";
        jdbcTemplate.update(sql, price, username);
    }
}

BookShopService.java(com.test.spring.xml.service.BookShopService)

package com.test.spring.xml.service;

public interface BookShopService {

    public void purchase(String username, String isbn);

}

BookShopServiceImpl.java(com.test.spring.xml.service.impl.BookShopServiceImpl)

package com.test.spring.xml.service.impl;

import com.test.spring.xml.BookShopDao;
import com.test.spring.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(500);
        } catch (InterruptedException e) {
        }

        // 1. 獲取書的單價
        int price = bookShopDao.findBookPriceByIsbn(isbn);

        // 2. 更新書的庫存
        bookShopDao.updateBookStock(isbn);

        // 3. 更新用戶餘額
        bookShopDao.updateUserAccount(username, price);

    }
}

Cashier.java(com.test.spring.xml.service.Cashier)

package com.test.spring.xml.service;

import java.util.List;

public interface Cashier {

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

CashierImpl.java(com.test.spring.xml.service.impl.CashierImpl)

package com.test.spring.xml.service.impl;

import com.test.spring.xml.service.BookShopService;
import com.test.spring.xml.service.Cashier;
import java.util.List;

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);
        }
    }
}

BookStockException.java(com.test.spring.xml.BookStockException)

package com.test.spring.xml;

public class BookStockException extends RuntimeException {

    private static final long serialVersionUID = 1L;

    public BookStockException() {
    }

    public BookStockException(String message) {
        super(message);
    }

    public BookStockException(String message, Throwable cause) {
        super(message, cause);
    }

    public BookStockException(Throwable cause) {
        super(cause);
    }

    public BookStockException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
        super(message, cause, enableSuppression, writableStackTrace);
    }
}

UserAccountException.java(com.test.spring.xml.UserAccountException)

package com.test.spring.xml;

public class UserAccountException extends RuntimeException {

    private static final long serialVersionUID = 1L;

    public UserAccountException() {
    }

    public UserAccountException(String message) {
        super(message);
    }

    public UserAccountException(String message, Throwable cause) {
        super(message, cause);
    }

    public UserAccountException(Throwable cause) {
        super(cause);
    }

    public UserAccountException(String message, Throwable cause, boolean enableSuppression,
        boolean writableStackTrace) {
        super(message, cause, enableSuppression, writableStackTrace);
    }
}

StringTransactionTest.java(com.test.spring.xml.StringTransactionTest)

package com.test.spring.xml;

import com.test.spring.xml.service.BookShopService;
import com.test.spring.xml.service.Cashier;
import java.util.Arrays;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class StringTransactionTest {

    private ApplicationContext ctx = null;
    private BookShopDao bookShopDao = null;
    private BookShopService bookShopService = null;
    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 testTeansactionlPropagation() {
        cashier.checkout("AA", Arrays.asList("1001", "1002"));
    }

    @Test
    public void testBookShopService() {
        bookShopService.purchase("AA", "1001");
    }
}

applicationContext-xml.xml

<?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/beans http://www.springframework.org/schema/beans/spring-beans.xsd 
  http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd 
  http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd 
  http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">

  <context:component-scan base-package="com.test.spring"></context:component-scan>

  <!-- 導入資源文件 -->
  <context:property-placeholder location="db.properties"></context:property-placeholder>

  <!-- 配置 C3P0 數據源 -->
  <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 Spring 的 JDBCTemplate -->
  <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
    <property name="dataSource" ref="dataSource"></property>
  </bean>

  <!-- 配置 bean -->
  <bean id="bookShopDao" class="com.test.spring.xml.BookShopDaoImpl">
    <property name="jdbcTemplate" ref="jdbcTemplate"></property>
  </bean>

  <bean id="bookShopService" class="com.test.spring.xml.service.impl.BookShopServiceImpl">
    <property name="bookShopDao" ref="bookShopDao"></property>
  </bean>

  <bean id="cashier" class="com.test.spring.xml.service.impl.CashierImpl">
    <property name="bookShopService" ref="bookShopService"></property>
  </bean>

  <!-- 1、配置事務管理器 -->
  <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"></property>
  </bean>

  <!-- 2、配置事務屬性 -->
  <tx:advice id="txAdvice" transaction-manager="transactionManager">
    <tx:attributes>
      <tx:method name="*"/>
    </tx:attributes>
  </tx:advice>

  <!-- 3、配置事務切入點以及把事務切入點和事務屬性關聯起來 -->
  <aop:config>
    <aop:pointcut id="txPointCut" expression="execution(* com.test.spring.xml.service.*.*(..))"/>
    <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"></aop:advisor>
  </aop:config>
</beans>

其他情況

錢夠買一本書，會減去一本書的錢和這本書的數量

  <!-- 2、配置事務屬性 -->
  <tx:advice id="txAdvice" transaction-manager="transactionManager">
    <tx:attributes>
      <!-- 根據方法名指定事務的屬性 -->
      <tx:method name="purchase" propagation="REQUIRES_NEW"/>
      <tx:method name="get*" read-only="true"/>
      <tx:method name="find*" read-only="true"/>
      <tx:method name="*"/>
    </tx:attributes>
  </tx:advice>