Consuming SQL Server/SQL Azure Data in Windows Phone 7.1 & Android through OData WCF Data Services & Entity Frameworks


Consuming data from SQL Server or SQL Azure database in Client Smart Devices like Windows Phone 7.1 , Android , iPhone or iPad is quite easy through the use of OData WCF Services. In previous posts , I already described how to consume data from live OData AtomPub feed showed in XML format. But, in this article I want to show how to consume SQL Server / SQL Azure data in Windows Phone & Android devices with the help of OData WCF services & entity frameworks where the service will be hosted in remote IIS & deployed SQL Server/SQL Azure database instance.

  • For creating solutions, let’s first start by creating an empty asp.net web application from Visual Studio.

  • Start by connecting with your SQL Server / SQL Azure database with Visual Studio .

  • Next, add data in the tables of SQL Server / SQL Azure database.

  • Next, Add an ADO.NET Entity Framework Model from Visual Studio to connect with SQL Server / SQL Azure database & save the connection string in web.config.

  • Connect with your database with proper credentials

  • Click on Next to select Tables, Views , Stored Procedures to select data.

  •  Now Add a WCF Service in the project & modify the code as like this:

using System;

using System.Collections.Generic;

using System.Data.Services;

using System.Data.Services.Common;

using System.Linq;

using System.ServiceModel.Web;

using System.Web;

namespace ODataSQLWP7

{

public class CustomerService : DataService<CustomersEntities>

{

// This method is called only once to initialize service-wide policies.

public static void InitializeService(DataServiceConfiguration config)

{

// TODO: set rules to indicate which entity sets and service operations are visible, updatable, etc.

// Examples:

// config.SetEntitySetAccessRule(“MyEntityset”, EntitySetRights.AllRead);

// config.SetServiceOperationAccessRule(“MyServiceOperation”, ServiceOperationRights.All);

config.SetEntitySetAccessRule( “CustomerInfoes”, EntitySetRights.All);

config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2;

}

}

}

  •  Now check the service in browser & it looks like this:

  • Reason of the error: It’s due to the permission set not configured for IIS to deploy the SQL Server/SQL Azure database data. For SQL Azure database while creating the database in Windows Azure portal , you need to set the firewall settings definitely to 0.0.0.0 to 255.255.255.255 in order to deploy the SQL Azure database in IIS.
  • Now Right-Click on the project , select Property -> Package/Publish Web tab: 

  • Remember to check the settings: Include all databases in  Package/Publish SQL tab.
  •  Next , Click on Package/Publish SQL options: Click on Import from Web.config to generate your SQL Server/SQL Azure database connection strings.
  • Click on Connection String for destination database & add your destination database which will be hosted in IIS.
  • Click on the checkbox under Source database information: Pull data/or schema from existing database.
  • Under database scripting options select Schema only (if you would like generate schema only) or Schema & Data for generating schema & data deployement both.

  • Now , add user to login to the deployed database from SQL Server Management Studio by right clicking on Security -> New Login 

  • Add user for login as ODataUser from Windows Add Users – Groups utility , alternatively , you can add user from right-clicking My Computer -> Manage-> Users & Groups -> User -> Add User.

  • Now under the User Mapping tab add the database that you would like to deploy & click on db_datareader & db_datawriter. Click OK.

  • Deploy the Web Service in IIS from Web Deploy wizard in Visual Studio.

  • Next, open the Application Pool in IIS manager which holds the deployed service & click on advanced settings : Select Process Model as Application Pool Idenity -> Under Custom account Set the account credentials which you have set under the SQL Server logins section.

  • After this settings, now access the Customer Info  with the Service URL settings & it will show the entire RSS feed in AtomPub/ JSON format from the SQL Server / SQL Azure database.

  • It means OData WCF service now able to access the SQL Server/ SQL Azure data in AtomPub format hosted in remote IIS. Next , It’s time to create the Client applications:
  • First take a Windows Phone Panorama Project & modify the MainPage.XAML as like this:

<controls:PanoramaItem Header=”first item”>

<!–Double line list with text wrapping–>

<ListBox x:Name=”lst” Margin=”0,0,-12,0″ ItemsSource=”{Binding}”>

<ListBox.ItemTemplate>

<DataTemplate>

<StackPanel Margin=”0,0,0,17″ Width=”432″>

<TextBlock Text=”{Binding FirstName}” TextWrapping=”Wrap” Margin=”12,-6,12,0″ Style=”{StaticResource PhoneTextExtraLargeStyle}” />

<TextBlock Text=”{Binding LastName}” TextWrapping=”Wrap” Margin=”12,-6,12,0″ Style=”{StaticResource PhoneTextExtraLargeStyle}” />

<TextBlock Text=”{Binding Address}” TextWrapping=”Wrap” Margin=”12,-6,12,0″ Style=”{StaticResource PhoneTextSubtleStyle}” />

<TextBlock Text=”{Binding City}” TextWrapping=”Wrap” Margin=”12,-6,12,0″ Style=”{StaticResource PhoneTextSubtleStyle}” />

<TextBlock Text=”{Binding State}” TextWrapping=”Wrap” Margin=”12,-6,12,0″ Style=”{StaticResource PhoneTextSubtleStyle}” />

<TextBlock Text=”{Binding Zip}” TextWrapping=”Wrap” Margin=”12,-6,12,0″ Style=”{StaticResource PhoneTextSubtleStyle}” />

</StackPanel>

</DataTemplate>

</ListBox.ItemTemplate>

</ListBox>

</controls:PanoramaItem>

  • Modify MainPage.XAML.CS:

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using Microsoft.Phone.Controls;

using WP7PanoramaOData.CustomersModel;

using System.Data.Services.Client;


namespace WP7PanoramaOData

{

public partial classMainPage : PhoneApplicationPage

{

// Constructor

public MainPage()

{

InitializeComponent();

// Set the data context of the listbox control to the sample data

DataContext = App.ViewModel;

this.Loaded += newRoutedEventHandler(MainPage_Loaded);

}

//   Load data for the ViewModel Items

private void MainPage_Loaded(object sender, RoutedEventArgs e)

{

var ctx = newCustomersEntities(newUri(http://10.12.1.223/ODataSQLWP7/CustomerService.svc/&#8221;));

var coll = new System.Data.Services.Client.DataServiceCollection<CustomerInfo>(ctx);

lst.ItemsSource = coll;

coll.LoadCompleted += new EventHandler<LoadCompletedEventArgs>(coll_LoadCompleted);

var qry = “/CustomerInfoes”;

coll.LoadAsync(new Uri(qry, UriKind.Relative));

}

void coll_LoadCompleted(object sender, LoadCompletedEventArgs e)

{

if (e.Error != null)

{

MessageBox.Show(e.Error.Message);

}

}

  • Remember to add Service Reference to your Windows Phone application by referencing the service hosted in IIS:

  • Check the View in Windows Phone 7 :

  • Adding View for Android SmartPhones consuming data from SQL Server / SQL Azure database through OData WCF Data Services:

package com.example.ODataAndroid;

import java.util.ArrayList;

import java.util.List;

import android.app.Activity;

import android.os.Bundle;

import org.odata4j.consumer.ODataConsumer;

import org.odata4j.core.OEntity;

import android.app.ListActivity;

import android.widget.ArrayAdapter;

public class ODataSQLAndroidActivity extends ListActivity {

/** Called when the activity is first created. */

@Override

public void  onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

        setListAdapter(new ArrayAdapter<String>(this,  android.R.layout.simple_list_item_1, GetExpenseReports()));

        getListView().setTextFilterEnabled(true);

    }

    ArrayList<String> GetExpenseReports()

    {

    ArrayList<String> listUI =new ArrayList<String>();

    ODataConsumer c = ODataConsumer.create( http://10.12.1.223/ODataSQLWP7/CustomerService.svc/);

    List<OEntity> listExpenses = c.getEntities( “CustomerInfoes”).execute().toList();

for(OEntity expense:listExpenses) {

    listUI.add(expense.getProperty( “ID”).getValue().toString()

    + “:” + expense.getProperty(“FirstName”).getValue().toString()

    + expense.getProperty(“LastName”).getValue().toString()

    + “\n”+ expense.getProperty(“Address”).getValue().toString()

    + “\n” + expense.getProperty(“City”).getValue().toString()

    + “\n”+ expense.getProperty(“State”).getValue().toString()

    );

    }

return  listUI;

    }

    }

  • Check out the SQL Server / SQL Azure database data in Android device:

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About Anindita
Anindita Basak is working as Big Data Cloud Consultant in Microsoft. Worked in multiple MNCs as Developer & Senior Developer on Microsoft Azure, Data Platform, IoT & BI , Data Visualization, Data warehousing & ETL & of course in Hadoop platform.She played both as FTE & v- employee in Azure platform teams of Microsoft.Passionate about .NET , Java, Python & Data Science. She is also an active Big Data & Cloud Trainer & would love share her experience in IT Training Industry. She is an author, forum contributor, blogger & technical reviewer of various books on Big Data Hadoop, HDInsight, IoT & Data Science, SQL Server PDW & PowerBI.

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