17_Spring_事务环境搭建

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 通过张三给李四转账案例演示事务的控制

1 数据库中准备表格

applicationContext.xml
jdbc.properties
见上节课

2 项目中准备实体类
 

package com.msb.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;
/**
 * @Author: Ma HaiYang
 * @Description: MircoMessage:Mark_7001
 */
@AllArgsConstructor
@NoArgsConstructor
@Data
public class Account implements Serializable {
    private Integer id;
    private String name;
    private Integer money;
}

3 准备DAO层,创建一个根据id修改money的方法

package com.msb.dao;
/**
 * @Author: Ma HaiYang
 * @Description: MircoMessage:Mark_7001
 */
public interface AccountDao {
    int transMoney(int id,int money);
}

package com.msb.dao.impl;
import com.msb.dao.AccountDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
/**
 * @Author: Ma HaiYang
 * @Description: MircoMessage:Mark_7001
 */
@Repository
public class AccountDaoImpl implements AccountDao {
    @Autowired
    private JdbcTemplate jdbcTemplate;
    @Override
    public int transMoney(int id, int money) {
        String sql ="update account set money =money +? where id =?";
        return jdbcTemplate.update(sql,money,id);
    }
}

4 准备Service,创建一个转账的业务方法

package com.msb.service;
/**
 * @Author: Ma HaiYang
 * @Description: MircoMessage:Mark_7001
 */
public interface AccountService {
    int transMoney(int from ,int to,int money);
}

package com.msb.service.impl;
import com.msb.dao.AccountDao;
import com.msb.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
/**
 * @Author: Ma HaiYang
 * @Description: MircoMessage:Mark_7001
 */
@Service
public class AccountServiceImpl implements AccountService {
    @Autowired
    private AccountDao accountDao;
    @Override
    public int transMoney(int from, int to, int money) {
        int rows=0;
        rows+=accountDao.transMoney(from, 0 - money);       
        rows+=accountDao.transMoney(to, money);        
        return rows;
    }
}

5 测试代码,测试转账
 

package com.msb.test;
import com.msb.service.AccountService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
 * @Author: Ma HaiYang
 * @Description: MircoMessage:Mark_7001
 */
public class TestTx {
    @Test()
    public void testTransaction(){
        ApplicationContext context =new ClassPathXmlApplicationContext("applicationContext.xml");
        AccountService accountService = context.getBean(AccountService.class);
        int rows = accountService.transMoney(1, 2, 100);
        System.out.println(rows);
    }
    
}