Finished SQLite Demo

AndreKraemer · May 5, 2017 · 9c50590 · 9c50590
1 parent 8fb47ea
commit 9c50590
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Showing 10 changed files with 204 additions and 2 deletions.
diff --git a/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo.Android/Services/PathService.cs b/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo.Android/Services/PathService.cs
@@ -11,5 +11,10 @@ public string GetDocumentsPath()
         {
             return Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
         }
+
+        public string GetDatabasePath()
+        {
+            return GetDocumentsPath();
+        }
     }
 }
diff --git a/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo.iOS/Servcies/PathService.cs b/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo.iOS/Servcies/PathService.cs
@@ -1,4 +1,5 @@
 using System;
+using System.IO;
 using XamarinLocalDataAccessDemo.iOS.Servcies;
 using XamarinLocalDataAccessDemo.Services;
 
@@ -11,5 +12,11 @@ public string GetDocumentsPath()
         {
             return Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
         }
+
+        public string GetDatabasePath()
+        {
+            var path = Path.Combine(GetDocumentsPath(), "..", "library");
+            return path;
+        }
     }
 }
diff --git a/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo/MainPage.xaml b/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo/MainPage.xaml
@@ -8,6 +8,7 @@
         <Button Clicked="LocalDataButton_OnClicked" Text="Read Application Base Data"></Button>
         <Button Clicked="EditApplicationBaseDataButton_OnClicked" Text="Edit Application Base Data"></Button>
         <Button Clicked="SecureDataButton_OnClicked" Text="Secure Data"></Button>
+        <Button Clicked="SqliteButton_OnClicked" Text="SQLite"></Button>
     </StackLayout>
 
 </ContentPage>
diff --git a/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo/MainPage.xaml.cs b/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo/MainPage.xaml.cs
@@ -29,5 +29,10 @@ private void SecureDataButton_OnClicked(object sender, EventArgs e)
         {
             Navigation.PushAsync(new SaveSecureDataDemoPage());
         }
+
+        private void SqliteButton_OnClicked(object sender, EventArgs e)
+        {
+            Navigation.PushAsync(new SqliteDemoPage());
+        }
     }
 }
diff --git a/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo/Models/Dish.cs b/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo/Models/Dish.cs
@@ -1,7 +1,9 @@
-namespace XamarinLocalDataAccessDemo.Models
+using System.ComponentModel.DataAnnotations;
+namespace XamarinLocalDataAccessDemo.Models
 {
     public class Dish
     {
+        [Key]
         public int Id { get; set; }
 
         public string Name { get; set; }

diff --git a/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo/Models/SqliteDataBase.cs b/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo/Models/SqliteDataBase.cs
@@ -0,0 +1,47 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Threading.Tasks;
+using SQLite;
+
+namespace XamarinLocalDataAccessDemo.Models
+{
+    public class SqliteDataBase
+    {
+        private SQLiteAsyncConnection _database;
+
+        public SqliteDataBase(string path)
+        {
+            path = Path.Combine(path, "dishes.sqlite");
+            _database = new SQLiteAsyncConnection(path);
+            _database.CreateTableAsync<Dish>().Wait();
+        }
+
+        public Task<List<Dish>> GetDishesAsync()
+        {
+            return _database.Table<Dish>().ToListAsync();
+        }
+
+
+        public Task<Dish> GetDishAsync(int id)
+        {
+            return _database.Table<Dish>().Where(i => i.Id == id).FirstOrDefaultAsync();
+        }
+
+        public Task<int> SaveDishAsync(Dish item)
+        {
+            if (item.Id != 0)
+            {
+                return _database.UpdateAsync(item);
+            }
+            else
+            {
+                return _database.InsertAsync(item);
+            }
+        }
+
+        public Task<int> DeleteDishAsync(Dish item)
+        {
+            return _database.DeleteAsync(item);
+        }
+    }
+}
diff --git a/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo/Pages/SqliteDemoPage.xaml b/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo/Pages/SqliteDemoPage.xaml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="XamarinLocalDataAccessDemo.Pages.SqliteDemoPage"
+             Title="ListView">
+    <ListView ItemsSource="{Binding Items}"
+            IsPullToRefreshEnabled="true"
+            CachingStrategy="RecycleElement"
+            IsRefreshing="{Binding IsBusy, Mode=OneWay}"
+            RefreshCommand="{Binding RefreshDataCommand}">
+        <ListView.Header>
+            <StackLayout Padding="10" 
+                         Orientation="Horizontal"
+                         HorizontalOptions="FillAndExpand"
+                         BackgroundColor="#dadada">
+                <Button Text="Add Entry" Command="{Binding AddCommand}"></Button>
+            </StackLayout>
+        </ListView.Header>
+        <!--Built in Cells-->
+        <ListView.ItemTemplate>
+            <DataTemplate>
+                <TextCell Text="{Binding Name}"
+                  Detail="{Binding Description}"/>
+            </DataTemplate>
+        </ListView.ItemTemplate>
+
+
+    </ListView>
+</ContentPage>
diff --git a/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo/Pages/SqliteDemoPage.xaml.cs b/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo/Pages/SqliteDemoPage.xaml.cs
@@ -0,0 +1,103 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+using Xamarin.Forms;
+using Xamarin.Forms.Xaml;
+using XamarinLocalDataAccessDemo.Models;
+using XamarinLocalDataAccessDemo.Services;
+
+namespace XamarinLocalDataAccessDemo.Pages
+{
+    [XamlCompilation(XamlCompilationOptions.Compile)]
+    public partial class SqliteDemoPage : ContentPage
+    {
+        public SqliteDemoPage()
+        {
+			InitializeComponent ();
+            BindingContext = new SqliteDemoPageViewModel();
+        }
+
+    }
+
+
+
+    class SqliteDemoPageViewModel : INotifyPropertyChanged
+    {
+        public ObservableCollection<Dish> Items { get; }
+        bool _busy;
+        private SqliteDataBase _db;
+
+        public SqliteDemoPageViewModel()
+        {
+
+            var path = DependencyService.Get<IPathService>().GetDatabasePath();
+            _db = new SqliteDataBase(path);
+            RefreshDataCommand = new Command(
+                async () => await RefreshData());
+            AddCommand = new Command(
+                async () => await AddData());
+
+            var t = _db.GetDishesAsync();
+            t.Wait();
+            var dishes = t.Result;
+            Items = new ObservableCollection<Dish>(dishes);
+        }
+
+        public ICommand RefreshDataCommand { get; }
+        public ICommand AddCommand { get; }
+
+        async Task RefreshData()
+        {
+            IsBusy = true;
+            IsBusy = true;
+            var dishes = await _db.GetDishesAsync();
+
+            Items.Clear();
+            foreach (var dish in dishes)
+            {
+                Items.Add(dish);
+            }
+            IsBusy = false;
+            await Task.Delay(2000);
+
+            IsBusy = false;
+        }
+
+        async Task AddData()
+        {
+            IsBusy = true;
+            var dish = new Dish
+            {
+                Name = $"Ensalada Fantasia ({DateTime.Now:T})",
+                Description = "Salat aus allen Zutaten, die noch übrig waren",
+                Price = 1.99,
+                CategoryId = 1
+            };
+            await _db.SaveDishAsync(dish);
+            IsBusy = false;
+        }
+
+        public bool IsBusy
+        {
+            get { return _busy; }
+            set
+            {
+                _busy = value;
+                OnPropertyChanged();
+                ((Command)RefreshDataCommand).ChangeCanExecute();
+            }
+        }
+
+
+        public event PropertyChangedEventHandler PropertyChanged;
+        void OnPropertyChanged([CallerMemberName]string propertyName = "") =>
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+
+    }
+}
diff --git a/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo/Services/IPathService.cs b/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo/Services/IPathService.cs
@@ -3,5 +3,6 @@
     public interface IPathService
     {
         string GetDocumentsPath();
+        string GetDatabasePath();
     }
 }
diff --git a/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo.csproj b/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo/XamarinLocalDataAccessDemo.csproj
@@ -1,13 +1,15 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>netstandard1.4</TargetFramework>
+    <TargetFramework>netstandard1.6</TargetFramework>
     <PackageTargetFallback>portable-net45+win8+wpa81+wp8</PackageTargetFallback>
     <DebugType>full</DebugType>
   </PropertyGroup>
 
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="10.0.2" />
+    <PackageReference Include="sqlite-net-pcl" Version="1.3.1" />
+    <PackageReference Include="System.ComponentModel.Annotations" Version="4.3.0" />
     <PackageReference Include="Xamarin.Forms" Version="2.3.4.231" />
   </ItemGroup>