How to delete a single file in yii2.0

This article mainly introduces the method of integrating Alibaba Cloud oss ​​with yii2.0 to delete a single file. It has certain reference value. Interested friends can refer to the main ideas of

and pass it in the controller. Obtain the fileid of the file to be deleted, pass the fileid to the model's deletefile method for processing, and return the processing result.
In the deletefile method, first find the corresponding file information based on the ID, and then delete the records in the data, the files in Alibaba Cloud oss, and the local files.

The main steps are as follows:

1 First, build a view, or write an ajax to send a request. The code is omitted here (let the front end write it).

2 Receive parameters in the controller and transfer them to the model. The code reference in the controller UploadController.php is as follows:

/**
   * 根据fileid删除文件
   * @return mixed 删除是否成功
   */
  public function actionDeletefile()
  {
    $res['error'] = 1;     // 准备返回数据
    Yii::$app->response->format = Response::FORMAT_JSON;  // 设置返回格式
    if (Yii::$app->request->isPost){            // 如果是post请求
      $postdata = Yii::$app->request->post('fileid',0);  // 从post里边获取文件id

      if ($postdata==0){                 // 如果文件id为0
        $res['errmsg'] = '删除失败，请重试';        // 准备返回数据
        return $res;                  // 返回结果
      }
      $model = new UploadForm();             // 实例化model
      $delres = $model->deletefile($postdata);      // 根据id调用deletefile方法

      if ($delres['error']==0){              // 如果删除成功
        $res['error'] = 0;               // 准备返回信息
      } else {
        $res['errmsg'] = $delres['errmsg'];       // 如果删除失败，准备返回信息
      }

    } else {
      $res['errmsg'] = '非法请求';             // 主要考虑post请求，get请求请自行修改代码
    }

    return $res;                      // 返回删除结果
  }

3 When the controller transfers the file ID to UploadForm.php, delete it in the deletefile method.

   /**
   * 删除阿里云oss里存储的文件和数据库里边保存到文件上传信息
   * @param $fileid  文件表里边的主键id
   * @return boolean  删除是否成功
   */
  public function deletefile($fileid)
  {
    $res['error'] = 1;  // 1表示默认有错误。
    $fileinfo = Yii::$app->db->createCommand('select ossfile,filePath,userid from file where id=:id')->bindParam(':id', $fileid)->queryOne();
    // 根据主键从数据库里边查询文件的信息,至少要一个服务器文件的完整路径（用来删除服务器文件）和一个ossfile的名称（删除阿里云oss里边的文件）

    if (count($fileinfo) > 0) {           // 如果找到了文件的记录

      // 这里边的验证可以更丰富一些，比如验证用户是否有权限删除该文件，文件是否属于该用户等等

      $ossfile = $fileinfo['ossfile'];      // 获取ossfile
      $realfile = $fileinfo['filePath'];     // 获取服务器上的文件
      $owner = $fileinfo['userid'];        // 获取上传图片用户的id
      $operator = Yii::$app->user->id;      // 获取删除图片的用户

      if ($owner != $operator) {         // 如果删除图片的用户不是上传的用户，报错并返回
        $res['errmsg'] = '您删除的图片不存在';
        return $res;
      }

      $trans = Yii::$app->db->beginTransaction(); // 开启事务
      try {
        $delstatus = Yii::$app->db->createCommand()->delete('file', 'id = ' . $fileid)->execute();
        //删除数据库里边的记录

        if ($delstatus) {            // 如果删除成功
          if (Yii::$app->Aliyunoss->delete($ossfile)) { //删除阿里云oss上的文件
            @unlink($realfile);       // 删除服务器上的文件
            $res['error'] = 0;       // 准备返回信息
            $trans->commit();        // 提交事务
          }
        }
        $trans->rollBack();           // 删除失败，事务回滚
      } catch (Exception $e) {          // 发生异常
        $res['errmsg'] = '删除失败';       // 准备返回信息
        $trans->rollBack();           // 事务回滚
      }

    } else {
      $res['errmsg'] = '图片不存在，请重试';      // 图片不存在
    }

    return $res;                   // 返回删除结果
  }

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