LINQ

Table Splitting Delete Data Using Code First Apporach

Introduction

This article shows how to do table splitting and delete data operations using Code First Approach.

Create a Console application as in the following:

create console application

Employee.cs

  1. using System;  
  2. using System.Collections.Generic;  
  3. using System.ComponentModel.DataAnnotations;  
  4. using System.ComponentModel.DataAnnotations.Schema;  
  5. using System.Linq;  
  6. using System.Text;  
  7. using System.Threading.Tasks;  
  8.   
  9. namespace Table_Splitting_Delete_Data_CFA  
  10. {  
  11.     public class Employee  
  12.     {  
  13.         public Employee()  
  14.         {  
  15.         }  
  16.   
  17.         [Key]  
  18.         [DatabaseGenerated(DatabaseGeneratedOption.Identity)]  
  19.         public int EmpId { get; set; }  
  20.         public string FirstName { get; set; }  
  21.         public string LastName { get; set; }  
  22.   
  23.         //Navigation Properties  
  24.         public EmployeeDetails EmployeeDetails { get; set; }  
  25.     }  
  26. }  

Employeedetails.cs

  1. using System;  
  2. using System.Collections.Generic;  
  3. using System.Linq;  
  4. using System.Text;  
  5. using System.Threading.Tasks;  
  6.   
  7. namespace Table_Splitting_Delete_Data_CFA  
  8. {  
  9.     public class EmployeeDetails  
  10.     {  
  11.         public EmployeeDetails()  
  12.         {  
  13.         }  
  14.   
  15.         public int EmpId { get; set; }  
  16.         public string Phone { get; set; }  
  17.         public string Email { get; set; }  
  18.   
  19.         //Navigation Properties  
  20.         public Employee Employee { get; set; }  
  21.     }  
  22. }  

Employeecontext.cs

  1. using System;  
  2. using System.Collections.Generic;  
  3. using System.Data.Entity;  
  4. using System.Linq;  
  5. using System.Text;  
  6. using System.Threading.Tasks;  
  7.   
  8. namespace Table_Splitting_Delete_Data_CFA  
  9. {  
  10.     public class EmployeeContext:DbContext  
  11.     {  
  12.         public EmployeeContext()  
  13.             : base("EmployeeConn")  
  14.         {  
  15.             Database.SetInitializer<EmployeeContext>(new CreateDatabaseIfNotExists<EmployeeContext>());  
  16.         }  
  17.   
  18.         public DbSet<Employee> Employees { get; set; }  
  19.   
  20.         protected override void OnModelCreating(DbModelBuilder modelBuilder)  
  21.         {  
  22.             modelBuilder.Entity<Employee>()  
  23.            .HasKey(pk => pk.EmpId)  
  24.            .ToTable("Employees");  
  25.   
  26.             modelBuilder.Entity<EmployeeDetails>()  
  27.                 .HasKey(pk => pk.EmpId)  
  28.                 .ToTable("Employees");  
  29.   
  30.             modelBuilder.Entity<Employee>()  
  31.                 .HasRequired(p => p.EmployeeDetails)  
  32.                 .WithRequiredPrincipal(c => c.Employee);  
  33.   
  34.             base.OnModelCreating(modelBuilder);  
  35.         }  
  36.     }  
  37. }  

Web.config

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

Program.cs

  1. using System;  
  2. using System.Collections.Generic;  
  3. using System.Linq;  
  4. using System.Text;  
  5. using System.Threading.Tasks;  
  6.   
  7. namespace Table_Splitting_Delete_Data_CFA  
  8. {  
  9.     class Program  
  10.     {  
  11.         static void Main(string[] args)  
  12.         {  
  13.             using (var dbContext = new EmployeeContext())  
  14.             {  
  15.                 var master = dbContext.Set<Employee>().Include("EmployeeDetails")  
  16.                         .SingleOrDefault(m => m.EmpId == 1);  
  17.                 dbContext.Set<Employee>().Remove(master);  
  18.                 dbContext.SaveChanges();  
  19.             }  
  20.         }  
  21.     }  
  22. }  

Summary

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

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