使用MyBatisPlus+Spring实现声明式事务

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)); //十进制减法 i1 = accountMapper.updateById(one1); //模拟转账异常 int a=1/0; one2.setMoney(one2.getMoney().add(money)); //十进制加法 i2 = accountMapper.updateById(one2); if (i1 > 0 && i2 > 0) { return true; } return false; } }