SQLite plugin with ngCordova in Ionic Framework => Using service pattern

productsController.js

controllers.controller('ProductsController', ['$scope', '$ionicPlatform', 'Products' function ($scope, $ionicPlatform, Products) {
    
    $scope.products = [];
    
    $scope.product = {
        IdProduct: 1,
        Name: 'Pizza',
        Icon: 'ion-pizza',
        Color: '#F056C2'
    };
    
    $ionicPlatform.ready(function () {

        Products.createTable().then(function(){
            return Products.addProduct($scope.product); //Insert a new product
        }).then(function () {
            return Products.getProducts(); //Get Products
        }).then(function (products) {
            $scope.products = products;
        }).catch(function (err) {
            console.log(err);
        });
    });
} ]);

productsService.js

services.factory('Products', ['$q', 'sqliteService', function ($q, sqliteService) {

    return {
        getProducts: function () {
            var query = 'SELECT * FROM Products';
            return $q.when(sqliteService.getItems(query));
        },
        addProduct: function (product) {
            var query = "INSERT INTO Products (IdProduct, Name, Icon, Color) VALUES (?,?,?,?)";
            return $q.when(sqliteService.executeSql(query, [product.IdProduct, product.Name, product.Icon, product.Color]));
        },
        dropTable: function () {
            var query = 'DROP TABLE IF EXISTS Products';
            return $q.when(sqliteService.executeSql(query));
        },
        createTable: function () {
            var query = 'CREATE TABLE IF NOT EXISTS Products (IdProduct integer primary key, Name text, Icon text, Color text)';
            return $q.when(sqliteService.executeSql(query));
        }
    };
});

sqliteService.js

services.service('sqliteService', ['$q', '$cordovaSQLite', function ($q, $cordovaSQLite) {
    var self = this;
    var _db;

    self.db = function () {
        if (!_db) {
            if (window.sqlitePlugin !== undefined) {
                _db = window.sqlitePlugin.openDatabase({ name: "demo.db", location: 2, createFromLocation: 1 });
            } else {
                // For debugging in the browser
                _db = window.openDatabase("demo.db", "1.0", "Demo", 200000);
            }
        }
        return _db;
    };

    self.getItems = function (query, parameters) {
        var deferred = $q.defer();
        self.executeSql(query, parameters).then(function (res) {
            var items = [];
            for (var i = 0; i < res.rows.length; i++) {
                items.push(res.rows.item(i));
            }
            return deferred.resolve(items);
        }, function (err) {
            return deferred.reject(err);
        });

        return deferred.promise;
    };

    self.executeSql = function (query, parameters) {
        return $cordovaSQLite.execute(self.db(), query, parameters);
    };
}]);