1. I am facing an issue where I am trying to write data to MySQL. When I input the data and press the submit button, the console log message from the function indicates that everything is okay. However, upon checking the database, there is nothing saved. Can someone assist me with this problem?
2. Additionally, I need to retrieve data from the database, combine it with new input data, and then save it to the database.

Here is the HTML code:

<div class="body-content bg-1">
<div class="col-sm-12 col-xs-12" ng-controller="UnosUSkladisteCtrl">
    <div class="container">
    <div class="alert alert-info alert-dismissable"><strong>Info!</strong> {{data.message}}</div>
       <div class="center">
            <h1>Ulaz robe u skladište</h1>
        </div>

        <p ng-controller="LoginCtrl">Dobro došao <b>{{deName}}</b>  | <a id="logout" href ng-click="logout()">Odjava</a></p>

    </div>

        <a href="#/dashboard"><div class="nav-button center col-sm-4 col-xs-4">Povratak</div></a>


    <div>
         <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" 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>

                <!-- 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> 
    </div>  

</div>

Here is the JavaScript file code:

 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 })
        .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"};

});

and here is the PHP file code for connection:

<?php
$data = json_decode(file_get_contents("php://input"));
$zlatni_medvjed = mysql_real_escape_string($data->zlatni_medvjed);
$crna_kraljica = mysql_real_escape_string($data->crna_kraljica);
$gricka_vjestica = mysql_real_escape_string($data->gricka_vjestica);
$dva_klasa = mysql_real_escape_string($data->dva_klasa);

mysql_connect("localhost","root","");
mysql_select_db("medvedgrad");
mysql_query("INSERT INTO stanje_piva(`zlatni_medvjed`, `crna_kraljica`, `gricka_vjestica`,`dva_klasa`)VALUES('"$zlatni_medvjed"','"$crna_kraljica"','"$gricka_vjestica"','"$dva_klasa"')")
?>

The MySQL columns are zlatni_medvjed, crna_kraljica, gricka_vjestica, and dva_klasa.