入力がある更新テーブルセットのみの列

Question

こんにちは私の問題は私はdbにデータを更新するアプリケーションに取り組んでいます。私の問題は、入力が空の場合に新しいデータをdbに送信するときに、テーブル内の既存のデータを0で上書きする場合です。値がある場合は、入力のケース番号で正しく更新されます。

空の入力を確認するにはどうすればいいですか？

<?php 
error_reporting(E_ALL); 
ini_set('display_errors', 1); 

$mysql_host = "localhost"; 
$mysql_username = "root"; 
$mysql_password = ""; 
$mysql_database = "medvedgrad"; 

// First we create the connection 
$pdo = new PDO("mysql:host=".$mysql_host .";dbname=".$mysql_database .";charset=utf8", $mysql_username, $mysql_password); 
$pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC); 
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 

$data = json_decode(file_get_contents("php://input")); 
$zm = $data->zlatni_medvjed; 
$ck = $data->crna_kraljica; 
$gv = $data->gricka_vjestica; 
$dk = $data->dva_klasa; 
$fk = $data->fakin; 

// Then we prepare, and execute the query 
$stmt = $pdo->prepare("UPDATE `stanje_piva` SET `zlatni_medvjed`=`zlatni_medvjed`+:zm, `crna_kraljica`=`crna_kraljica`+:ck, `gricka_vjestica`=`gricka_vjestica`+:gv, `dva_klasa`=`dva_klasa`+:dk,`fakin`=`fakin`+:fk WHERE `id`=1"); 


$stmt->execute(array("zm" => $zm, "ck" => $ck, "gv" => $gv, "dk" => $dk, "fk" => $fk)); 
?> 

Answer 1

あなたは配列にのみ、空でない値を含めるとのみを更新するための方法が必要です。

$updateArray = array(); 
$sqlString = "Update `stanje_piva` SET "; 

foreach(['zm' => $zm, 'ck' => $ck, 'gv' => $gv, 'dk' => $dk, 'fk' => $fk] as $key => $value){ 

    // add to updateArray ONLY IF NOT EMPTY 
    if($value != ''){ 
     // add key/value to updateArray 
     array_push($updateArray, $key => $value); 

     // append key/value to sql string 
     switch($key){ 
      case 'zm': 
       $sqlString .= "`zlatni_medvjed`=`zlatni_medvjed`+:zm, "; 
       break; 
      case 'ck': 
       $sqlString .= "`crna_kraljica`=`crna_kraljica`+:ck, "; 
       break; 
      case 'gv': 
       $sqlString .= "`gricka_vjestica`=`gricka_vjestica`+:gv, "; 
       break; 
      case 'dk': 
       $sqlString .= "`dva_klasa`=`dva_klasa`+:dk, "; 
       break; 
      case 'fk': 
       $sqlString .= "`fakin`=`fakin`+:fk, "; 
       break; 
     } 
    } 
} 

// remove last ', ' from sqlQuery 
$sqlQuery = substr($sqlQuery, 0, strlen($sqlQuery)-2); 

// add Where clause 
$sqlQuery .= " WHERE `id`=1"; 

// prepare 
$stmt = $pdo->prepare($sqlQuery); 

// execute 
$stmt->execute($updateArray); 

編集：stmtを準備するのを忘れて、それを加えました。

Answer 2

if(!empty($zm) && !empty($ck) && !empty($gv) && !empty($dk) && !empty($fk)) { 
    $stmt->execute(array("zm" => $zm, "ck" => $ck, "gv" => $gv, "dk" => $dk, "fk" => $fk)); 
}