例子程式

基本結構

db.properties

jdbc.user=root
jdbc.password=etron
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql:///spring

jdbc.initPoolSize=5
jdbc.maxPoolSize=50

BookShopDao.java

package com.spring.tx.xml;

public interface BookShopDao {

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

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

    //更新使用者的賬戶餘額：使username的balance-price
    public void updateUserAccount(String username, int price);
}

BookShopDaoImpl.java

package com.spring.tx.xml;

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;
 

    }

    @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) {
        //檢查賬戶書的庫存是否足夠，若不夠免責丟擲異常
        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) {
        //驗證餘額是否足夠，若不足，則丟擲異常
        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

package com.spring.tx.xml.service;


public interface BookShopService {



    public void purchase(String username, String isbn);



}

Cashier.java

package com.spring.tx.xml.service;

import java.util.List;

public interface Cashier {

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

}

BookShopServiceImpl.java

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

import com.spring.tx.xml.BookShopDao;
import com.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.獲取書的單價
        int price = bookShopDao.findBookPriceByIsbn(isbn);

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

        //3.更新使用者的餘額
        bookShopDao.updateUserAccount(username,price);
    }
}

CashierImpl.java

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

import com.spring.tx.xml.service.BookShopService;
import com.spring.tx.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);
        }
    }
}

applicationContext-tx-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:cocvntext="http://www.springframework.org/schema/context"
       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">

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


    <!-- 匯入資原始檔 -->
    <context:property-placeholder location="classpath:db.properties"/>


    <!-- 配置C3P0資料來源 -->
    <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.spring.tx.xml.BookShopDaoImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate"></property>
    </bean>

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

    <bean id="cashier" class="com.spring.tx.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>
            <!--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: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  expression="execution(* com.spring.tx.xml.service.*.*(..))"
                       id="txPointCut"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
    </aop:config>

</beans>

SpringTransactionTest.java

package com.spring.tx.xml;

import com.spring.tx.xml.service.BookShopService;
import com.spring.tx.xml.service.Cashier;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.Arrays;

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);
    }

    public void testTransactionlPropagation(){
        cashier.checkout("AA",Arrays.asList("1001","1002"));
    }


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



    public static void main(String[] args){

        new SpringTransactionTest().testBookShopService();


    }

}

資料庫的表