How get Selected Itens in a Check Box and Insert into a WebSQL in Ionic

I need get the selected itens in a Check Box and Insert in a WebSQL.

My View HTML:

`<ion-view view-title="Comprar Bebidas Adicionais" hide-nav-bar="false" >     
    
     <div class="bar bar-subheader">
          <h2 class="title">{{'Sub-Total R$ ' + getTotalSelected() }}</h2>          
     </div>   
      
<ion-content delegate-handle="top" lazy-scroll  id="lista-bebidas" class="has-header lista-bebidass" ng-controller="exBebidasCtrl" >
		
			<ion-refresher pulling-text="Puxe para atualizar..."  on-refresh="doRefresh()"></ion-refresher>
			<ion-list class="card list">
				<div class="item item-input">
					<i class="icon ion-search placeholder-icon"></i>
					<input type="search" ng-model="q" placeholder="Procurar" aria-label="filter bebidasextras" />
				</div>
			</ion-list>
       
       <ion-list>
       
           <div ng-repeat="bebida in bebidasextras">
              <ion-checkbox ng-model="bebida.selected" ng-checked="bebida.selected" > 
                 <h2>{{bebida.ad_bebida_titulo}}</h2><p>R$ {{bebida.ad_bebida_valor}}</p>
              </ion-checkbox>
           </div>        
 
              
        
    </ion-list>      
           
                <button class="button button-block button-balanced" ng-click="updateBebida()">
                    Continuar Comprando
                </button>  
                
                   {{ selectedItems | json }} 
                         
        </ion-content>      
  
 
</ion-view>

I try get the selected itens and insert into a WebSQL:

MY CONTROLLER:

`.controller(“exBebidasCtrl”, function($scope,$rootScope,$state,$ionicScrollDelegate,$http,$httpParamSerializer,$stateParams,$timeout,$ionicLoading,$ionicPopup,$ionicPopover,$ionicSlideBoxDelegate,$ionicHistory,ionicMaterialInk,ionicMaterialMotion, sharedCartService,CartServiceBebidasEx, $location, DBLocal){

// VERIFICA SE HÁ BEBIDAS EXTRAS

$scope.bebidasextras = [];

var promise = $http.get('http://nhac.esy.es/api_carrinho/lista_bebida_extra.php?json=restaurantes')
  .success(function(retorno) {
    console.log(retorno);
    $scope.bebidasextras = retorno; // não precisa fazer retorno.data
      
        $scope.user = {
            bebidasextras: [$scope.bebidasextras[1]]
          };
          $scope.checkAll = function() {
            $scope.user.bebidasextras = angular.copy($scope.bebidasextras);
          };
          $scope.uncheckAll = function() {
            $scope.user.bebidasextras = [];
          };
          $scope.checkFirst = function() {
            $scope.user.bebidasextras = [];
            $scope.user.bebidasextras.push($scope.bebidasextras[0]);
          };
          $scope.setToNull = function() {
            $scope.user.bebidasextras = null;
          };
      
      
      
      // CALCULA TOTAL DOS ITENS SELECIONADOS NA LISTA
      $scope.sub = function(i) {
          i.quantity--;
        }

        $scope.add = function(i) {
          i.quantity++;
        }
      
      $scope.getTotalSelected = function() {
      var total = 0;

      for(var i = 0; i < $scope.bebidasextras.length; i++){
        var bebida = $scope.bebidasextras[i];
        total += bebida.selected ? Number(bebida.ad_bebida_valor) : 0;
      }            
     

      return total;
    }
      
})
.error(function(erro) {        
    console.log(erro);
});


    // PEGA BEBIDAS SELECIONADAS      
    $scope.updateBebida = function(){
        var p = [];
        for (var i = 0; i < $scope.bebidasextras.length; i++) {
           var item = $scope.bebidasextras[i];
           if ( item.selected) {
            p.push(item )  
           }

        }

        $scope.selectedItems = p;
        //console.log(p);            
       
        
      // TESTA SE GUARDA A BEBIDA SELECIONADA
      
      // INSERINDO DADOS LOCALMENTE
	  DBLocal.localdb();

// var dados = p.filter(function(e){
// return e.ad_bebida_titulo == bebida.ad_bebida_titulo;
// })

      DBLocal.db.transaction(function(res){
          res.executeSql("INSERT INTO AD_BEBIDAS (nome_bebida_ad) VALUES(?);",[p]);              
      });
        
        
       
    }

})

But I cant not get the selected and insert in my WebSQL Table.`

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