springboot中添加事務注解

1.首先在service層中的方法前添加@Transactional

@Service
public class UserService {
        @Autowired
        private UserMapper userMapper;

        public List<User> queryAll(){
            System.out.println("熱部署");
            return userMapper.findAll();
        }
    @Transactional
    public void deleteById(Integer id) {
           userMapper.deleteById(id);
         //  int c=10/0;
    }
}

2.在springboot的啟動中添加注解@EnableTransactionManagement

@SpringBootApplication
@EnableTransactionManagement //開啟事務管理注解模式 最新的版本可以省略
@MapperScan("com.xz.springboot.mapper") //掃描該包下所有的接口並為該接口生成實現類
public class Springboot01Application {

    public static void main(String[] args) {
        SpringApplication.run(Springboot01Application.class, args);
    }

}