@Slf4j
@Service
public class MemberService {

    @Autowired
    private MemberMapper memberMapper;

    @Transactional
    public Integer insert(MemberEntity memberEntity) {
        Integer insertResult = 0;
        try {
            insertResult = memberMapper.save(memberEntity);
            log.info("insertResult:{}", insertResult);
            int result = 1 / memberEntity.getAge();
        } catch (Exception e) {
            log.error("errorMsg:{}", e.getMessage());
            //回滚
            TransactionAspectSupport.currentTransactionStatus().setRollbackOnly();
        }
        return insertResult;
    }
}

如上标红代码，如果不写的话，事务是不会回滚的。因为事务被 catch 捕获到了，所以只能手动的进行事务回滚。