Table Splitting Select Data Using Code First Approach

Introduction

This article shows how to do table splitting and select data operation using Code First Approach.

SQL Server table structure

Create a console application as in the following:

 

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 Table_Splitting_SelectData_CFA
{
    public class Employee
    {
        public Employee()
        {
        }

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

        //Navigation Properties
        public EmployeeDetails EmployeeDetails { get; set; }
    }
}

Employeedetails.cs

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

namespace Table_Splitting_SelectData_CFA
{
    public class EmployeeDetails
    {
        public EmployeeDetails()
        {
        }

        public int EmpId { get; set; }
        public string Phone { get; set; }
        public string Email { get; set; }

        //Navigation Properties
        public Employee Employee { 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 Table_Splitting_SelectData_CFA
{
    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>()
           .HasKey(pk => pk.EmpId)
           .ToTable("Employees");

            modelBuilder.Entity<EmployeeDetails>()
                .HasKey(pk => pk.EmpId)
                .ToTable("Employees");

            modelBuilder.Entity<Employee>()
                .HasRequired(p => p.EmployeeDetails)
                .WithRequiredPrincipal(c => c.Employee);

            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 Table_Splitting_SelectData_CFA
{
    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.EmployeeDetails.Phone + " Email: " + r.EmployeeDetails.Email);
            }
            Console.ReadKey();
        }
    }
}

Summary

In this article we saw how to do table splitting and select data operations using Code First Approach. Happy coding!