// Entity Framework Extensions

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

​

// @nuget: Microsoft.EntityFrameworkCore.SqlServer

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

​

using System;

using System.Collections.Generic;

using System.Diagnostics;

using Microsoft.Data.SqlClient;

using Microsoft.EntityFrameworkCore;

​

public class Program

{

    public static List<BenchmarkResult> BenchmarkResults = new List<BenchmarkResult>();

    public static void Main()

    {

        using (var context = new EntityContext())

        {

            context.Database.EnsureCreated();

        }

        JustInTime_Compile();

        // Generate X orders

        var orders = GenerateOrders(1000, 5);

        var clockSaveChanges = new Stopwatch();

        var clockBulkInsert = new Stopwatch();

        var clockBulkInsertOptimized = new Stopwatch();

        using (var context = new EntityContext())

        {

            // SaveChanges

            context.Orders.AddRange(orders);

            clockSaveChanges.Start();

            // COMMENT the SaveChanges if you want to generate more than around 1800 orders.

            context.SaveChanges();

            clockSaveChanges.Stop();

​

            BenchmarkResults.Add(new BenchmarkResult() { Action = "SaveChanges (EF)", Entities = orders.Count, Performance = clockSaveChanges.ElapsedMilliseconds + " ms" });

        }

        using (var context = new EntityContext())

        {

            // BulkInsert

            clockBulkInsert.Start();

            context.BulkInsert(orders, options => options.IncludeGraph = true); // performance can be improved with options

            clockBulkInsert.Stop();

​

            var timeFaster = Math.Round((double)clockSaveChanges.ElapsedMilliseconds / clockBulkInsert.ElapsedMilliseconds, 2);

            var reducedPercent = Math.Round((double)(clockSaveChanges.ElapsedMilliseconds - clockBulkInsert.ElapsedMilliseconds) / clockSaveChanges.ElapsedMilliseconds, 2) * 100;

            BenchmarkResults.Add(new BenchmarkResult() { Action = "BulkInsert + IncludeGraph", Entities = orders.Count, Performance = $"{clockBulkInsert.ElapsedMilliseconds} ms", TimeFaster = $"{timeFaster}x faster than SaveChanges", ReducedPercent = $"Time reduced by {reducedPercent}% compared to SaveChanges" });

        }

        using (var context = new EntityContext())

        {

            // BulkInsertOptimized

            clockBulkInsertOptimized.Start();           

            context.BulkInsertOptimized(orders, options => options.IncludeGraph = true);        

            clockBulkInsertOptimized.Stop();

​

            var timeFaster = Math.Round((double)clockSaveChanges.ElapsedMilliseconds / clockBulkInsertOptimized.ElapsedMilliseconds, 2);

            var reducedPercent = Math.Round((double)(clockSaveChanges.ElapsedMilliseconds - clockBulkInsertOptimized.ElapsedMilliseconds) / clockSaveChanges.ElapsedMilliseconds, 2) * 100;

            BenchmarkResults.Add(new BenchmarkResult() { Action = "BulkInsertOptimized + IncludeGraph", Entities = orders.Count, Performance = $"{clockBulkInsertOptimized.ElapsedMilliseconds} ms", TimeFaster = $"{timeFaster}x faster than SaveChanges", ReducedPercent = $"Time reduced by {reducedPercent}% compared to SaveChanges" });

        }

​

        FiddleHelper.WriteTable(BenchmarkResults);

    }

    public static void JustInTime_Compile()

    {

        var orders = GenerateOrders(20, 5);

        // SaveChanges

        using (var context = new EntityContext())

        {

            context.Orders.AddRange(orders);

            context.SaveChanges();

            // Clean

            context.BulkDelete(orders, options => options.IncludeGraph = true);

        }

        // BulkInsert

        using (var context = new EntityContext())

        {

            context.BulkInsert(orders, options => options.IncludeGraph = true);

            // Clean

            context.BulkDelete(orders, options => options.IncludeGraph = true);

        }

​

        // BulkInsertOptimized

        using (var context = new EntityContext())

        {

            context.BulkInsertOptimized(orders, options => options.IncludeGraph = true);

            // Clean

            context.BulkDelete(orders, options => options.IncludeGraph = true);

        }

    }

    public static List<Order> GenerateOrders(int count, int itemCount)

    {

        var list = new List<Order>();

        for(int i = 0; i < count; i++)

        {

            var order = new Order() { Items = new List<OrderItem>() };

            for(int j = 0; j < itemCount; j++)

            {

                order.Items.Add(new OrderItem());

            }

            list.Add(order);

        }

​

        return list;

    }

​

    public class EntityContext : DbContext

    {

        public EntityContext() 

        {

        }

​

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)

        {

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

​

            base.OnConfiguring(optionsBuilder);

        }

        public DbSet<Order> Orders { get; set; }

        public DbSet<OrderItem> OrderItems { get; set; }

    }

​

    public class Order

    {

        public int OrderID { get; set; }

        public List<OrderItem> Items { get; set; }

        public string Column1 { get; set; }

        public string Column2 { get; set; }

        public string Column3 { get; set; }

        public string Column4 { get; set; }

        public string Column5 { get; set; }

        public string Column6 { get; set; }

        public string Column7 { get; set; }

        public string Column8 { get; set; }

        public string Column9 { get; set; }

    }

    public class OrderItem

    {

        public int OrderItemID { get; set; }

        public string Column1 { get; set; }

        public string Column2 { get; set; }

        public string Column3 { get; set; }

        public string Column4 { get; set; }

        public string Column5 { get; set; }

        public string Column6 { get; set; }

        public string Column7 { get; set; }

        public string Column8 { get; set; }

        public string Column9 { get; set; }

    }

    public class BenchmarkResult

    {

        public string Action { get; set; }

        public int Entities { get; set; }

        public string Performance { get; set; }     

        public string TimeFaster { get; set; }

        public string ReducedPercent { get; set; }

    }

}