Question

我对php和mySQL还是很陌生。我正在编写一个需要占用和释放位置的程序，我做的方法是制作一个名为“ spaces”的表，它具有“ id”和“ occupied_by”（占用该位置的用户）作为属性。我将“ occupied_by”的默认值设置为NULL，这样我就知道空间是否被占用。我编写了占用Spots的代码，并且效果很好。但是我总是在代码错误上清空它们

在constrants.php文件中，我有这些

define ('SUCCESS', 301);
define ('FAIL', 302);
define ('FREE', 303);

然后在operations.php文件中，我有此代码

public function freeSpot($id){

            if(!$this->isOccupied($id)){
                return FREE;
            }
            else {
                $stmt = $this->con->prepare("UPDATE spaces SET occupied_by = NULL WHERE id = ?");
                $stmt->bind_param("ss", $occupiedBy, $id);
                if ($stmt->execute()){
                    return SUCCESS;
                }else{

                    return FAIL;
                }   
            }
}

private function isOccupied($id){

            $query = $this->con->prepare("SELECT occupied_by FROM spaces WHERE (id = ?) LIMIT 1");
            $query->bind_param("s", $occupiedBy);
            $query->bind_result($occupy);
            $query->execute();
            $query->store_result();
            return $query->num_rows > 0;
        }

，在我用来检查POSTMAN上的代码的index.php文件中，我有以下代码：

$app->post('/freeSpot/{id}', function (Request $request, Response $response) {


        $pSpaceId = $request->getAttribute('id');
        $requestData = $request->getParsedBody();
       // $occupiedBy = $requestData['occupied_by'];

        $db = new DbOperations();
        $result = $db->freeSpot($id);

        $responseData = array();

        if ($result == SUCCESS) {
            $responseData['error'] = false;
            $responseData['message'] = 'spot emptied successfully';

            $response->write(json_encode($responseData));
            return $response
                ->withHeader('Content-type', 'application/json')
                ->withStatus(200);

        } else if($result == FAIL) {
            $responseData['error'] = true;
            $responseData['message'] = 'Could not empty';

            $response->write(json_encode($responseData));
            return $response
                ->withHeader('Content-type', 'application/json')
                ->withStatus(200);
        }

        else if($result == FREE){
            $responseData['error'] = true;
            $responseData['message'] = 'spot is already empty';

            $response->write(json_encode($responseData));
            return $response
                ->withHeader('Content-type', 'application/json')
                ->withStatus(200);
        }


        return $response
            ->withHeader('Content-type', 'application/json')
            ->withStatus(422);

});

无论我输入什么ID，它都会告诉我“ spot已经为空”，而不是。怎么了？

如何使用php将数据库中的属性更新为null值

0 个答案: