Xamarin.Forms Working with local databases Working with local databases using xamarin.forms in visual studio 2015


Example

SQlite example Step by step Explanation

  1. The steps below demonstrate how to include this component in a Xamarin.Forms Shared Project: to add packages in (pcl,Andriod,Windows,Ios) Add References Click on Manage Nuget packages ->click on Browse to install SQLite.Net.Core-PCL , SQLite Net Extensions after installation is completed check it once in references then

  2. To add Class Employee.cs below code

     using SQLite.Net.Attributes;
    
         namespace DatabaseEmployeeCreation.SqlLite
         {
             public   class Employee
             {
                 [PrimaryKey,AutoIncrement]
                 public int Eid { get; set; }
                 public string Ename { get; set; }
                 public string Address { get; set; }
                 public string phonenumber { get; set; }
                 public string email { get; set; } 
             }
         }
    
  3. To add one interface ISQLite

 using SQLite.Net;  
            //using SQLite.Net;
            namespace DatabaseEmployeeCreation.SqlLite.ViewModel
            {
                public interface ISQLite
                {
                    SQLiteConnection GetConnection();
                }
            }
  1. Create a one class for database logics and methods below code is follow .

using SQLite.Net; using System.Collections.Generic; using System.Linq; using Xamarin.Forms; namespace DatabaseEmployeeCreation.SqlLite.ViewModel { public class DatabaseLogic { static object locker = new object(); SQLiteConnection database;

    public DatabaseLogic()
    {
        database = DependencyService.Get<ISQLite>().GetConnection();
        // create the tables
        database.CreateTable<Employee>();
    }

    public IEnumerable<Employee> GetItems()
    {
        lock (locker)
        {
            return (from i in database.Table<Employee>() select i).ToList();
        }
    }

    public IEnumerable<Employee> GetItemsNotDone()
    {
        lock (locker)
        {
            return database.Query<Employee>("SELECT * FROM [Employee]");
        }
    }

    public Employee GetItem(int id)
    {
        lock (locker)
        {
            return database.Table<Employee>().FirstOrDefault(x => x.Eid == id);
        }
    }

    public int SaveItem(Employee item)
    {
        lock (locker)
        {
            if (item.Eid != 0)
            {
                database.Update(item);
                return item.Eid;
            }
            else
            {
                return database.Insert(item);
            }
        }
    }

    public int DeleteItem(int Eid)
    {
        lock (locker)
        {
            return database.Delete<Employee>(Eid);
        }
    }
}

}

  1. to Create a xaml.forms EmployeeRegistration.xaml
    <?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="DatabaseEmployeeCreation.SqlLite.EmployeeRegistration"
      Title="{Binding Name}" >
      <StackLayout VerticalOptions="StartAndExpand" Padding="20">
    
        <Label Text="Ename" />
        <Entry x:Name="nameEntry" Text="{Binding Ename}"/>
        <Label Text="Address" />
        <Editor x:Name="AddressEntry" Text="{Binding Address}"/>
        <Label Text="phonenumber" />
        <Entry x:Name="phonenumberEntry" Text="{Binding phonenumber}"/>
        <Label Text="email" />
        <Entry x:Name="emailEntry" Text="{Binding email}"/>
    
        <Button Text="Add" Clicked="addClicked"/>
    
       <!-- <Button Text="Delete" Clicked="deleteClicked"/>-->
    
        <Button Text="Details" Clicked="DetailsClicked"/>
    
        <!--  <Button Text="Edit" Clicked="speakClicked"/>-->
    
      </StackLayout>
    </ContentPage>

EmployeeRegistration.cs

    using DatabaseEmployeeCreation.SqlLite.ViewModel;
    using DatabaseEmployeeCreation.SqlLite.Views;
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    
    using Xamarin.Forms;
    
    namespace DatabaseEmployeeCreation.SqlLite
    {
        public partial class EmployeeRegistration : ContentPage
        {
            private int empid;
            private Employee obj;
    
            public EmployeeRegistration()
            {
                InitializeComponent();
    
            }
    
            public EmployeeRegistration(Employee obj)
            {
                this.obj = obj;
                var eid = obj.Eid;
                Navigation.PushModalAsync(new EmployeeRegistration());
                var Address = obj.Address;
                var email = obj.email;
                var Ename = obj.Ename;
                var phonenumber = obj.phonenumber;
                AddressEntry. = Address;
                emailEntry.Text = email;
                nameEntry.Text = Ename;
    
                //AddressEntry.Text = obj.Address;
                //emailEntry.Text = obj.email;
                //nameEntry.Text = obj.Ename;
                //phonenumberEntry.Text = obj.phonenumber;
    
                Employee empupdate = new Employee(); //updateing Values 
                empupdate.Address = AddressEntry.Text;
                empupdate.Ename = nameEntry.Text; 
                empupdate.email = emailEntry.Text;
                empupdate.Eid = obj.Eid;
                App.Database.SaveItem(empupdate);
                Navigation.PushModalAsync(new EmployeeRegistration());
              
            }
    
            public EmployeeRegistration(int empid)
            {
                this.empid = empid;
                Employee lst = App.Database.GetItem(empid);
                //var Address = lst.Address;
                //var email = lst.email;
                //var Ename = lst.Ename;
                //var phonenumber = lst.phonenumber;
                //AddressEntry.Text = Address;
                //emailEntry.Text = email;
                //nameEntry.Text = Ename;
                //phonenumberEntry.Text = phonenumber;
    
                // to retriva values based on id to 
                AddressEntry.Text = lst.Address;
                emailEntry.Text = lst.email;
                nameEntry.Text = lst.Ename;
                phonenumberEntry.Text = lst.phonenumber;
                
                Employee empupdate = new Employee(); //updateing Values 
                empupdate.Address = AddressEntry.Text;
                empupdate.email = emailEntry.Text;
                App.Database.SaveItem(empupdate);
                Navigation.PushModalAsync(new EmployeeRegistration());
            }
    
            void addClicked(object sender, EventArgs e)
            {
                //var createEmp = (Employee)BindingContext;
                Employee emp = new Employee();
                emp.Address = AddressEntry.Text;
                emp.email = emailEntry.Text;
                emp.Ename = nameEntry.Text;
                emp.phonenumber = phonenumberEntry.Text;
                App.Database.SaveItem(emp);
                this.Navigation.PushAsync(new EmployeeDetails());
    
            }
            //void deleteClicked(object sender, EventArgs e)
            //{
            //    var emp = (Employee)BindingContext;
            //    App.Database.DeleteItem(emp.Eid);
            //    this.Navigation.PopAsync();
            //}
            void DetailsClicked(object sender, EventArgs e)
            {
                var empcancel = (Employee)BindingContext;
                this.Navigation.PushAsync(new EmployeeDetails());
            }
            //    void speakClicked(object sender, EventArgs e)
            //    {
            //        var empspek = (Employee)BindingContext;
            //        //DependencyService.Get<ITextSpeak>().Speak(empspek.Address + " " + empspek.Ename);
            //    }
        }
    }
  1. to display EmployeeDetails below code behind

     using DatabaseEmployeeCreation;
     using DatabaseEmployeeCreation.SqlLite;
     using System;
     using System.Collections.Generic;
     using System.Linq;
     using System.Text;
     using System.Threading.Tasks;
     
     using Xamarin.Forms;
     
     namespace DatabaseEmployeeCreation.SqlLite.Views
     {
         public partial class EmployeeDetails : ContentPage
         {
             ListView lv = new ListView();
             IEnumerable<Employee> lst;
             public EmployeeDetails()
             {
                 InitializeComponent();
                 displayemployee();
             }
     
             private void displayemployee()
             {
                 Button btn = new Button()
                 {
     
                     Text = "Details",
                     BackgroundColor = Color.Blue,
                 };
                 btn.Clicked += Btn_Clicked;
                 //IEnumerable<Employee> lst = App.Database.GetItems();
                 //IEnumerable<Employee> lst1 = App.Database.GetItemsNotDone();
                 //IEnumerable<Employee> lst2 = App.Database.GetItemsNotDone();
                 Content = new StackLayout()
                 {
                     Children = { btn },
                 };
             }
     
             private void Btn_Clicked(object sender, EventArgs e)
             {
                 lst = App.Database.GetItems();
     
                 lv.ItemsSource = lst;
                 lv.HasUnevenRows = true;
                 lv.ItemTemplate = new DataTemplate(typeof(OptionsViewCell));
     
                 Content = new StackLayout()
                 {
                     Children = { lv },
                 };
     
             }
         }
    
        public class OptionsViewCell : ViewCell
        {
    
            int empid;
            Button btnEdit;
            public OptionsViewCell()
            {
            }
            protected override void OnBindingContextChanged()
            {
                base.OnBindingContextChanged();
    
                if (this.BindingContext == null)
                    return;
    
                dynamic obj = BindingContext;
                empid = Convert.ToInt32(obj.Eid);
                var lblname = new Label
                {
                    BackgroundColor = Color.Lime,
                    Text = obj.Ename,
                };
    
                var lblAddress = new Label
                {
                    BackgroundColor = Color.Yellow,
                    Text = obj.Address,
                };
    
                var lblphonenumber = new Label
                {
                    BackgroundColor = Color.Pink,
                    Text = obj.phonenumber,
                };
    
                var lblemail = new Label
                {
                    BackgroundColor = Color.Purple,
                    Text = obj.email,
                };
    
                var lbleid = new Label
                {
                    BackgroundColor = Color.Silver,
                    Text = (empid).ToString(),
                };
    
                //var lblname = new Label
                //{
                //    BackgroundColor = Color.Lime,
                //    // HorizontalOptions = LayoutOptions.Start
                //};
                //lblname.SetBinding(Label.TextProperty, "Ename");
    
                //var lblAddress = new Label
                //{
                //    BackgroundColor = Color.Yellow,
                //    //HorizontalOptions = LayoutOptions.Center,
                //};
                //lblAddress.SetBinding(Label.TextProperty, "Address");
    
                //var lblphonenumber = new Label
                //{
                //    BackgroundColor = Color.Pink,
                //    //HorizontalOptions = LayoutOptions.CenterAndExpand,
                //};
                //lblphonenumber.SetBinding(Label.TextProperty, "phonenumber");
    
                //var lblemail = new Label
                //{
                //    BackgroundColor = Color.Purple,
                //    // HorizontalOptions = LayoutOptions.CenterAndExpand
                //};
                //lblemail.SetBinding(Label.TextProperty, "email");
                //var lbleid = new Label
                //{
                //    BackgroundColor = Color.Silver,
                //    // HorizontalOptions = LayoutOptions.CenterAndExpand
                //};
                //lbleid.SetBinding(Label.TextProperty, "Eid");
                Button btnDelete = new Button
                {
                    BackgroundColor = Color.Gray,
    
                    Text = "Delete",
                    //WidthRequest = 15,
                    //HeightRequest = 20,
                    TextColor = Color.Red,
                    HorizontalOptions = LayoutOptions.EndAndExpand,
                };
                btnDelete.Clicked += BtnDelete_Clicked;
                //btnDelete.PropertyChanged += BtnDelete_PropertyChanged;  
    
                btnEdit = new Button
                {
                    BackgroundColor = Color.Gray,
                    Text = "Edit",
                    TextColor = Color.Green,
                };
                // lbleid.SetBinding(Label.TextProperty, "Eid");
                btnEdit.Clicked += BtnEdit_Clicked1; ;
                //btnEdit.Clicked += async (s, e) =>{
                //    await App.Current.MainPage.Navigation.PushModalAsync(new EmployeeRegistration());
                //};
    
                View = new StackLayout()
                {
                    Orientation = StackOrientation.Horizontal,
                    BackgroundColor = Color.White,
                    Children = { lbleid, lblname, lblAddress, lblemail, lblphonenumber, btnDelete, btnEdit },
                };
    
                //View = new StackLayout()
                //{ HorizontalOptions = LayoutOptions.Center, WidthRequest = 10, BackgroundColor = Color.Yellow, Children = { lblAddress } };
    
                //View = new StackLayout()
                //{ HorizontalOptions = LayoutOptions.End, WidthRequest = 30, BackgroundColor = Color.Yellow, Children = { lblemail } };
    
                //View = new StackLayout()
                //{ HorizontalOptions = LayoutOptions.End, BackgroundColor = Color.Green, Children = { lblphonenumber } };
    
    
    
    
                //string Empid =c.eid ;
    
            }
    
            private async void BtnEdit_Clicked1(object sender, EventArgs e)
            {
               Employee obj= App.Database.GetItem(empid);
                if (empid > 0)
                {
                    await App.Current.MainPage.Navigation.PushModalAsync(new EmployeeRegistration(obj));
                }
                else {
                await App.Current.MainPage.Navigation.PushModalAsync(new EmployeeRegistration(empid));
                }
            }
    
    
    
            private void BtnDelete_Clicked(object sender, EventArgs e)
            {
                // var eid = Convert.ToInt32(empid);
                // var item = (Xamarin.Forms.Button)sender;
                int eid = empid;
                App.Database.DeleteItem(eid);
            }
            //private void BtnDelete_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
            //{
            // var ename=  e.PropertyName;
            //}
        }
    
        //private void BtnDelete_Clicked(object sender, EventArgs e)
        //{
        //    var eid = 8;
        //    var item = (Xamarin.Forms.Button)sender;
    
        //    App.Database.DeleteItem(eid);
        //}
    }
  1. To implement method in Android and ios GetConnection() method
    using System;
    using Xamarin.Forms;
    using System.IO;
    using DatabaseEmployeeCreation.Droid;
    using DatabaseEmployeeCreation.SqlLite.ViewModel;
    using SQLite;
    using SQLite.Net;
    
    [assembly: Dependency(typeof(SQLiteEmployee_Andriod))]
    namespace DatabaseEmployeeCreation.Droid
    {
        public class SQLiteEmployee_Andriod : ISQLite
        {
            public SQLiteEmployee_Andriod()
            {
            }
    
            #region ISQLite implementation
            public SQLiteConnection GetConnection()
            {
                //var sqliteFilename = "EmployeeSQLite.db3";
                //string documentsPath = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal); // Documents folder
                //var path = Path.Combine(documentsPath, sqliteFilename);
    
                //// This is where we copy in the prepopulated database
                //Console.WriteLine(path);
                //if (!File.Exists(path))
                //{
                //    var s = Forms.Context.Resources.OpenRawResource(Resource.Raw.EmployeeSQLite);  // RESOURCE NAME ###
    
                //    // create a write stream
                //    FileStream writeStream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write);
                //    // write to the stream
                //    ReadWriteStream(s, writeStream);
                //}
    
                //var conn = new SQLiteConnection(path);
    
                //// Return the database connection 
                //return conn;
                var filename = "DatabaseEmployeeCreationSQLite.db3";
                var documentspath = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
                var path = Path.Combine(documentspath, filename);
                var platform = new SQLite.Net.Platform.XamarinAndroid.SQLitePlatformAndroid();
                var connection = new SQLite.Net.SQLiteConnection(platform, path);
                return connection;
            }
    
            //public  SQLiteConnection GetConnection()
            //{
            //    var filename = "EmployeeSQLite.db3";
            //    var documentspath = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
            //    var path = Path.Combine(documentspath, filename);
    
            //    var platform = new SQLite.Net.Platform.XamarinAndroid.SQLitePlatformAndroid();
            //    var connection = new SQLite.Net.SQLiteConnection(platform, path);
            //    return connection;
            //}
            #endregion
    
            /// <summary>
            /// helper method to get the database out of /raw/ and into the user filesystem
            /// </summary>
            void ReadWriteStream(Stream readStream, Stream writeStream)
            {
                int Length = 256;
                Byte[] buffer = new Byte[Length];
                int bytesRead = readStream.Read(buffer, 0, Length);
                // write the required bytes
                while (bytesRead > 0)
                {
                    writeStream.Write(buffer, 0, bytesRead);
                    bytesRead = readStream.Read(buffer, 0, Length);
                }
                readStream.Close();
                writeStream.Close();
            }
        }
    }

I hope this above example is very easy way i explained