// Entity Framework Extensions - Main Features - Batch Operations

// Doc: https://entityframework-extensions.net/

​

// @nuget: Microsoft.EntityFrameworkCore.SqlServer

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

​

using Microsoft.EntityFrameworkCore;

using System;

using System.Collections.Generic;

using System.ComponentModel.DataAnnotations;

using System.ComponentModel.DataAnnotations.Schema;

using System.Linq;

using Microsoft.Data.SqlClient;

public class Program

{

    public static void Main()

    {

        using (var context = new EntityContext())

        {

            context.Database.EnsureCreated();

        }

        // SEED database

        using (var context = new EntityContext())

        {

            context.Customers.Add(new Customer() { Code = $"Info", Name = "Support Team", Email = "info@zzzprojects.com", IsActive = true, LastLogin = new DateTime(1981, 04, 13) });

            context.Customers.Add(new Customer() { Code = $"Sales", Name = "Sales Team", Email = "sales@zzzprojects.com", IsActive = true, LastLogin = DateTime.Now });

            context.BulkSaveChanges();

            FiddleHelper.WriteTable("1 - Customers (Before)", context.Customers.ToList());          

        }

        using (var context = new EntityContext())

        {

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

​

            // UPDATE active customers who haven’t logged in recently

            context.Customers

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

                .UpdateFromQuery(x => new Customer { IsActive = false });

​

            // INSERT inactive customers without invoices into a backup table

            context.Customers

                .Where(x => !x.IsActive)

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

​

            // DELETE inactive customers without invoices

            context.Customers

                .Where(x => !x.IsActive)

                .DeleteFromQuery();

            FiddleHelper.WriteTable("2 - Customers (After)", context.Customers.ToList());       

            FiddleHelper.WriteTable("3 - Backup Customers", context.BackupCustomers.ToList());  

        }

    }

​

    public class EntityContext : DbContext

    {

        public EntityContext() 

        {

        }

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

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

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)

        {

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

​

            base.OnConfiguring(optionsBuilder);

        }

    }

​

    public class Customer

    {

        public int CustomerID { get; set; }

        public string Code { get; set; }

        public string Name { get; set; }

        public string Email { get; set; }

        public bool IsActive { get; set; }

        public DateTime LastLogin { get; set; }

    }

    [Table("bck_Customers")]

    public class BackupCustomer

    {

        [Key]

        [DatabaseGenerated(DatabaseGeneratedOption.None)]

        public int CustomerID { get; set; }

        public string Code { get; set; }

        public string Name { get; set; }

        public string Email { get; set; }

        public DateTime LastLogin { get; set; }

    }

}