檢查是否有任何輸入值?如果輸入的值爲null/empty,請不要將它們更新爲DB?檢查是否有任何輸入值
這是我的代碼,當我有空的輸入時,我在數據庫中丟失了以前的數據。
<?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));
?>
你試過['空()'](http://php.net/manual/en/function.empty.php)命令? –
1.爲什麼在佔位符前有'+'符號,2.數組格式應該是'array(placeholder,value)'這裏'array(:zm => $ zm)'not'array(「zm」=> $ ZM)'。請檢查這些。 –
昨天你問了這個問題,它在這裏得到了回答:http://stackoverflow.com/questions/40888924/update-table-set-only-column-wich-have-input?noredirect=1#comment69016187_40888924 –