Spring 事务管理 —— 模拟转账案例

dao层:

package com.fy.dao;

import com.fy.domain.Account;

/**
 * 账户持久层接口
 */
public interface AccountDao{
    /**
     * 根据Id的查询
     * @param accountId
     * @return
     */
    Account findAccountById(Integer accountId);

    /**
     * 根据name查找
     * @param accountName
     * @return
     */
    Account findAccountByName(String accountName);

    /**
     * 更改账户
     * @param account
     */
    void updateAccount(Account account);
}

package com.fy.dao.impl;

import com.fy.dao.AccountDao;
import com.fy.domain.Account;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.support.JdbcDaoSupport;

import java.util.List;

/**
 * 账户的持久层实现类
 */
public class AccountDaoImpl extends JdbcDaoSupport implements AccountDao {
/*
    private JdbcTemplate jdbcTemplate;

    public void setJdbcTemplate(JdbcTemplate jabcTemplate) {
        this.jdbcTemplate = jabcTemplate;
    }
*/

    @Override
    public Account findAccountById(Integer accountId) {
        List<Account> accounts = getJdbcTemplate().query("select * from account.demo1 where id=?",new BeanPropertyRowMapper<Account>(Account.class),accountId);
        return accounts.isEmpty()?null:accounts.get(0);
    }

    @Override
    public Account findAccountByName(String accountName) {
        List<Account> accounts = getJdbcTemplate().query("select * from account.demo1 where name=?",new BeanPropertyRowMapper<Account>(Account.class),accountName);
        if(accounts.isEmpty()){
            return null;
        }
        if(accounts.size()>1){
            throw new RuntimeException("结果不唯一");
        }
        return accounts.get(0);
    }

    @Override
    public void updateAccount(Account account) {
        getJdbcTemplate().update("update account.demo1 set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());
    }
}

domain:

package com.fy.domain;

import java.io.Serializable;

public class Account implements Serializable {
    private Integer id;
    private String name;
    private Float money;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Float getMoney() {
        return money;
    }

    public void setMoney(Float money) {
        this.money = money;
    }

    @Override
    public String toString() {
        return "Account{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", money=" + money +
                '}';
    }
}

service:

package com.fy.service;


import com.fy.dao.AccountDao;
import com.fy.domain.Account;

public interface AccountService {

    /**
     * 模拟查找账户
     */
     Account finAccountById(Integer accountId);
     /**
     * 模拟转账
     */
    void transfer(String sourceName, String targetName,Float money);
}

package com.fy.service.impl;

import com.fy.dao.AccountDao;
import com.fy.domain.Account;
import com.fy.service.AccountService;
import org.springframework.stereotype.Service;

@Service("accountService")
public class AccountServiceImpl implements AccountService {
    private AccountDao accountDao;

    public void setAccountDao(AccountDao accountDao) {
        this.accountDao = accountDao;
    }

    @Override
    public Account finAccountById(Integer accountId) {
        return accountDao.findAccountById(accountId);
    }

    @Override
    public void transfer(String sourceName, String targetName, Float money) {
        System.out.println("transfer.....");
        //根据名称查询转出账户
        Account source = accountDao.findAccountByName(sourceName);
        //根据名称查询转入账户
        Account target = accountDao.findAccountByName(targetName);
        //转出账户减钱
        source.setMoney(source.getMoney()-money);
        //转入账户加钱
        target.setMoney(target.getMoney()+money);
        //跟新转出账户
        accountDao.updateAccount(source);
        accountDao.updateAccount(target);
    }
}

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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
        <bean id="accountService" class="com.fy.service.impl.AccountServiceImpl">
            <property name="accountDao" ref="AccountDao"></property>
        </bean>
    <bean id="AccountDao" class="com.fy.dao.impl.AccountDaoImpl">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/account?serverTimezone=UTC"></property>
        <property name="username" value="root"></property>
        <property name="password" value="*****"></property>
    </bean>
</beans>

测试类：

package com.fy.test;

import com.fy.domain.Account;
import com.fy.service.AccountService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:TXBean.xml")
public class AccountServiceTest {
    @Autowired
    private AccountService as;

    @Test
    public void testTransfer(){
        as.transfer("aaa","bbb",100f);
    }
}

运行前图片：

运行后图片：