當更新的數據庫，我不想更新所有列

Question

當更新的數據庫，我不想更新所有列，只更新，如果我已經填寫<input/>

現在，我的代碼，當我做數據提交到數據庫中，如果輸入是空的我用db更新了那個db列，並丟失了以前的數據。如何解決這個問題？如果輸入爲空，則不要向db發送任何數據。

<?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)); 
?> 

這裏是我的角度控制器

angular.module('angularLoginApp') 
.controller('UnosUSkladisteCtrl', function($scope,$http) { 

    $scope.insertdata = function(){ 
     $http.post("database/unos-piva.php", {'zlatni_medvjed':$scope.zlatni_medvjed, 'crna_kraljica':$scope.crna_kraljica, 'gricka_vjestica':$scope.gricka_vjestica, 'dva_klasa':$scope.dva_klasa, 'fakin':$scope.fakin }) 
     .success(function(data,status,headers,config){ 
      console.log("Podaci uspiješno spremljeni"); 
      alert("Nove količine piva su dodane u skladište"); 
     }); 
    } 

    $scope.data = {message: "Molimo vas da točno navedete što unosite u skladište"}; 

}); 

HTML

<form class="form-horizontal col-xs-12" col-sm-12" name="signUpForm" ng-submit="submitFormSignUp()" novalidate> 

       <!-- Zlatni medvjed --> 
       <div class="form-group" ng-class=""> 
        <label class="col-sm-4 col-xs-12 control-label no-padding-right " for="zlatni_medvjed">Zlatni medvjed boca 0.5l</label> 
        <div class="col-sm-4 col-xs-12"> 
         <span class="block input-icon input-icon-right"> 
          <input ng-model="zlatni_medvjed" ng-change="doCheck()" placeholder="Količina boca 0.5l" type="number" class="form-control">       
         </span> 
        </div> 
       </div> 
       <!-- Crna kraljica --> 
       <div class="form-group" ng-class=""> 
        <label class="col-sm-4 col-xs-12 control-label no-padding-right " for="crna_kraljica">Crna kraljica boca 0.5l</label> 
        <div class="col-sm-4 col-xs-12"> 
         <span class="block input-icon input-icon-right"> 
          <input ng-model="crna_kraljica" placeholder="Količina boca 0.5l" type="number" class="form-control">       
         </span> 
        </div> 
       </div> 
       <!-- Grička vještica --> 
       <div class="form-group" ng-class=""> 
        <label class="col-sm-4 col-xs-12 control-label no-padding-right " for="gricka_vjestica">Grička vještica boca 0.5l</label> 
        <div class="col-sm-4 col-xs-12"> 
         <span class="block input-icon input-icon-right"> 
          <input ng-model="gricka_vjestica" placeholder="Količina boca 0.5l" type="number" class="form-control">       
         </span> 
        </div> 
       </div> 
       <!-- Dva klasa --> 
       <div class="form-group" ng-class=""> 
        <label class="col-sm-4 col-xs-12 control-label no-padding-right " for="dva_klasa">Dva klasa boca 0.5l</label> 
        <div class="col-sm-4 col-xs-12"> 
         <span class="block input-icon input-icon-right"> 
          <input ng-model="dva_klasa" placeholder="Količina boca 0.5l" type="number" class="form-control">       
         </span> 
        </div> 
       </div> 
       <!-- Fakin --> 
       <div class="form-group" ng-class=""> 
        <label class="col-sm-4 col-xs-12 control-label no-padding-right " for="fakin">Fakin boca 0.5l</label> 
        <div class="col-sm-4 col-xs-12"> 
         <span class="block input-icon input-icon-right"> 
          <input ng-model="fakin" placeholder="Količina boca 0.5l" type="number" class="form-control">       
         </span> 
        </div> 
       </div> 

       <!-- SUBMIT BUTTON --> 
       <label class="col-sm-4 control-label no-padding-right"></label> 
        <div class="col-sm-4"> 
         <button ng-click="insertdata()" type="submit" class="btn btn-primary btn-lg btn-block">Unesi količine u skladište</button> 
        </div> 
    </form> 

Answer 1

你應該把一個單一的對象，而不是手動設置對象的每個屬性在$ http.post功能。

angular.module('angularLoginApp') 
.controller('UnosUSkladisteCtrl', function($scope,$http) { 
$scope.form = {}; 

$scope.insertdata = function(){ 
    $http.post("database/unos-piva.php", $scope.form) 
    .success(function(data,status,headers,config){ 
     console.log("Podaci uspiješno spremljeni"); 
     alert("Nove količine piva su dodane u skladište"); 
    }); 
} 

$scope.data = {message: "Molimo vas da točno navedete što unosite u skladište"}; 

}); 

然後在你的HTML表單讓你的NG-模型=「這樣的」表單對象的訪問屬性：

<input ng-model="form.zlatni_medvjed" ng-change="doCheck()" placeholder="Količina boca 0.5l" type="number" class="form-control"> 

，當你做這個，你應該已經空值發送到服務器辦法。 您也可以在網絡選項卡上的開發控制檯中檢查它是否確實向服務器發送0，或者如果它發送空值並且服務器將0保存到數據庫。

---

編輯

問題是這樣的：

//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)); 

如果你每次都設定值，而不檢查，看看是否有一個值，你將永遠失去以前的數據，即使該值爲空（因此更新的值將爲空）。