使用MyBatisPlus+Spring实现声明式事务

在pom.xml中导入依赖

导入MyBatisPlus相关依赖

                <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.3.1</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
​
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

配置数据源

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://10.211.55.2:3306/jdbctest?useSSL=true&useUnicode=true&characterEncoding=utf-8
    username: root
    password: Aa123123.

创建实体类

package demo.entity;
​
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
​
import java.math.BigDecimal;
​
@TableName("acount")
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Account {
    @TableId(type = IdType.AUTO)
    private Integer id;
​
    private String name;
​
    private BigDecimal money;
}

创建Mapper

package demo.mapper;
​
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import demo.entity.Account;
import org.apache.ibatis.annotations.Mapper;
​
@Mapper
public interface AccountMapper extends BaseMapper<Account> {
}

创建Service

AccountService

package demo.service;
​
import com.baomidou.mybatisplus.extension.service.IService;
import demo.entity.Account;
import java.math.BigDecimal;
​
public interface AccountService extends IService<Account> {
​
    boolean transfer(String source, String target, BigDecimal money);
}

AccountServiceImpl

package demo.service.impl;
​
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import demo.entity.Account;
import demo.mapper.AccountMapper;
import demo.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
​
import java.math.BigDecimal;
​
@Service
public class AccountServiceImpl extends ServiceImpl<AccountMapper, Account> implements AccountService {
    @Autowired
    private AccountMapper accountMapper;
​
    private Integer i1;
    private Integer i2;
​
    //开启事务
    @Transactional
    public boolean transfer(String source, String target, BigDecimal money) {
        //获取汇款方
        QueryWrapper<Account> wrapper1 = new QueryWrapper<>();
        wrapper1.eq("name", source);
        Account one1 = accountMapper.selectOne(wrapper1);
​
        QueryWrapper<Account> wrapper2 = new QueryWrapper<>();
        wrapper2.eq("name", target);
        Account one2 = accountMapper.selectOne(wrapper2);
​
        one1.setMoney(one1.getMoney().subtract(money));
        i1 = accountMapper.updateById(one1);
        //模拟转账异常
        int a=1/0;
​
        one2.setMoney(one2.getMoney().add(money));
        i2 = accountMapper.updateById(one2);
        if (i1 > 0 && i2 > 0) {
            return true;
        }
        return false;
    }
}

TestController

package demo.controller;
​
import demo.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
​
import java.math.BigDecimal;
​
@RestController
public class TestController {
​
    @Autowired
    private AccountService accountService;
​
    @RequestMapping("/test")
    public String test(){
        String result = null;
        boolean b = accountService.transfer("A", "B", BigDecimal.valueOf(700D));
        if(b){
            result = "转账成功!";
        } else {
            result = "转账异常!";
        }
        return result;
    }
}