Entity Splitting Select Data Using Code First Approach

Introduction

This article shows how to perform Entity Splitting and later we will also look at how to perform a select data operation using the Code First Approach.

Create console application

 

Employee.cs

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EntitySplitting_CodeFirstApproach
{
    public class Employee
    {
        public Employee()
        {
        }

        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public int Phone { get; set; }
        public string Email { get; set; }

    }
}

Employeecontext.cs

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace EntitySplitting_CodeFirstApproach
{
    public class EmployeeContext : DbContext
    {
        public EmployeeContext()
            : base("EmployeeConn")
        {
            Database.SetInitializer<EmployeeContext>(new CreateDatabaseIfNotExists<EmployeeContext>());
        }

        public DbSet<Employee> Employees { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Employee>()
                .Map(map =>
                {
                    map.Properties(r => new
                    {
                        r.Id,
                        r.FirstName,
                        r.LastName
                    }); map.ToTable("Employee");
                })
                .Map(map =>
                {
                    map.Properties(r => new
                    {
                        r.Phone,
                        r.Email
                    }); map.ToTable("EmployeeDetails");
                });

            base.OnModelCreating(modelBuilder);
        }
    }
}

Web.config

<connectionStrings>
    <add name="EmployeeConn"
    connectionString="Data Source=WIN-B4KJ8JI75VF;Initial Catalog=EmployeeDB;Integrated Security=true"
    providerName="System.Data.SqlClient"/>
  </connectionStrings>

Program.cs

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

namespace EntitySplitting_CodeFirstApproach
{
    class Program
    {
        static void Main(string[] args)
        {
            EmployeeContext empContext = new EmployeeContext();
            var query = from r in empContext.Employees select r;

            foreach (var r in query)
            {
                Console.WriteLine("FirstName: " + r.FirstName + " LastName: " + r.LastName + " Phone: " + r.Phone + " Email: " + r.Email);
            }
            Console.ReadKey();

        }
    }
}

The output of the application looks as in the following:

 

Summary

In this article we saw how to perform Entity Splitting and how to perform a select data operation using the Code First Approach. Happy coding!