// Entity Framework Extensions

// Doc: https://entityframework-extensions.net/delete-from-query

​

// @nuget: Microsoft.EntityFrameworkCore.SqlServer

// @nuget: Z.EntityFramework.Extensions.EFCore

​

using System;

using System.ComponentModel.DataAnnotations;

using System.ComponentModel.DataAnnotations.Schema;

using System.Linq;

using Microsoft.EntityFrameworkCore;

using System.Collections.Generic;

using Microsoft.Data.SqlClient;

​

public class Program

{

    public static void Main()

    {

        using (var context = new EntityContext())

        {

            context.Database.EnsureCreated();

        }

        GenerateData();

        using (var context = new EntityContext())

        {

            // INSERT all customers that are inactive for more than two years into a backup table

            var date = DateTime.Now.AddYears(-2);

            context.Customers

                .Where(x => x.IsActive && x.LastLogin < date)

                .InsertFromQuery("bck_Customer", x => new { x.CustomerID, x.Name, x.Email });

            // Only Jonathan should appear

            FiddleHelper.WriteTable("bck_Customer", context.BackupCustomers.AsNoTracking().ToList());

        }

    }

    public static void GenerateData()

    {

        using (var context = new EntityContext())

        {

            context.Customers.Add(new Customer() { Name = "Jonathan", Email = "info@zzzprojects.com", IsActive = true, LastLogin = DateTime.Now.AddYears(-3) });

            context.Customers.Add(new Customer() { Name = "Sales", Email = "sales@zzzprojects.com", IsActive = false, LastLogin = DateTime.Now.AddYears(-3) });

            context.Customers.Add(new Customer() { Name = "Sara", Email = "sara@zzzprojects.com", IsActive = true, LastLogin = DateTime.Now });

            context.BulkSaveChanges();

        }

    }

    public class EntityContext : DbContext

    {

        public EntityContext() 

        {

        }

​

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)

        {

            optionsBuilder.UseSqlServer(new SqlConnection(FiddleHelper.GetConnectionStringSqlServer()));

​

            base.OnConfiguring(optionsBuilder);

        }

        public DbSet<Customer> Customers { get; set; }

        public DbSet<BackupCustomer> BackupCustomers { get; set; }

    }   

    public class Customer

    {

        public int CustomerID { get; set; }

        public string Name { get; set; }

        public string Email { get; set; }

        public DateTime LastLogin { get; set; }

        public Boolean IsActive { get; set; }

    }

    [Table("bck_Customer")]

    public class BackupCustomer

    {

        [Key]

        [DatabaseGenerated(DatabaseGeneratedOption.None)]

        public int CustomerID { get; set; }

        public string Name { get; set; }

        public string Email { get; set; }

    }

}