Learning Video Executing Stored Procedure in LINQ to SQL

Source code used in Video


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace StoredProcedure
{
    class Program
    {
        static void Main(string[] args)
        {
            DataClasses1DataContext context = new DataClasses1DataContext();
            // Call SP with parameter
            int studentID = 2;
            var result=  context.GetStudentGrades(studentID);
            foreach (var r in result)
            {
                Console.WriteLine(r.Grade);
            }

            // call SP with parameter
            int? a=1;
            var result1 = context.GetStudentCount(ref a);
            Console.WriteLine(a);

            Console.ReadKey(true);

        }
    }
}

***********************************************************

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Stored Procedure in WCF Data Service

In this article we will explore, how could we use Stored Procedure with WCF Data Service?

You can read Introduction to WCF Data service and ODATA here

To use Stored Procedure, at time of creation of Data Model, select Stored Procedure as part of Data Model.

clip_image001

Now open EDMX file and right click on that. Select Add and then select Function Import.

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Popup window will be open.

1. Give Function import name

2. Choose Stored procedure from drop down

3. Choose the Entity type Stored Procedure is returning.

clip_image003

Stored Procedure we are selecting is GetStudentGrades and it is returning one or more entities of StudentGrade.

After clicking OK you can see columns are mapped

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You can see in model browser that GetStudentGrades has been listed in Function Imports section and it is having one input parameter StudentD.

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We can see now that Stored Procedure has been mapped to Entity model and can be exposed as WCF Data Service.

Next step we need to create a function in DataService class. This function will return list of entities.Client will call this function to execute Stored Procedure. clip_image008

In above function,

1. Creating instance of Entity class.

2. Calling the Function on this object. We need to search function import name to call on object of entity class.

3. Function is having one input parameter to pass as parameter to execute stored Procedure.

For Reference full source code of service class is as below,

WcfDataService.svc.cs


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 WebApplication6
{
 public class WcfDataService1 : DataService<SchoolEntities>
 {

 public static void InitializeService(DataServiceConfiguration config)
 {

 config.SetEntitySetAccessRule("*", EntitySetRights.AllRead);
 config.SetServiceOperationAccessRule("*", ServiceOperationRights.All);
 config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2;
 }

[WebGet]
 public List<StudentGrade> GetStudentGrade(string studentId)
 {
 SchoolEntities entities = new SchoolEntities();
 return entities.GetStudentGrades(Convert.ToInt32(studentId)).ToList();
 }
 }
}

To call the Stored Procedure in browser

http://localhost:14469/WcfDataService1.svc/GetStudentGrade?studentId=’2

Now to call Stored Procedure at Client side

clip_image010

We need to pass the exact URL of the function in service class executing Stored Procedure.

For Reference full source code at client is as below,

Program.cs


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.Services;
using System.Data.Services.Client;
using ConsoleApplication1.ServiceReference1;

namespace ConsoleApplication1
{
 class Program
 {
 static void Main(string[] args)
 {

DataServiceContext context = new DataServiceContext(new Uri("http://localhost:14469/WcfDataService1.svc/"));

 List<StudentGrade> lstStudentsGrade = context.Execute<StudentGrade>
 (new Uri("http://localhost:14469/WcfDataService1.svc/GetStudentGrade?studentId='2'")).ToList();

 foreach (var r in lstStudentsGrade)
 {
 Console.WriteLine("Student :" + r.StudentID.ToString() +" Grade : " +  r.Grade);

}
 Console.ReadKey(true);

}
 }
}

Output we are expecting is as below,

clip_image012

We saw in this article, how we could call a Stored Procedure using WCF Data Service.