// Bulk Operations

// Doc: https://bulk-operations.net/bulk-delete

​

// @nuget: Z.BulkOperations

// @nuget: System.Data.SqlClient

​

using System;

using System.Linq;

using System.Collections.Generic;

using System.Diagnostics;

using System.Data;

using System.Data.SqlClient;

using Z.BulkOperations;

​

public class Program

{

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

    public static void Main()

    {

        GenerateDatabase();

        JustInTime_Compile();

        // Generate X customers

        var customerCount = 1000;

        var clockBulkDelete = new Stopwatch();

​

        // Generate X customers (half for update, half for insert)

        var customers = GenerateCustomers(customerCount);

        using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServer()))

        {       

            connection.Open();

            // BulkDelete

            using (var bulk = new BulkOperation<Customer>(connection))

            {

                bulk.DestinationTableName = "Customers";

                clockBulkDelete.Start();

                bulk.BulkDelete(customers); 

                clockBulkDelete.Stop();

                BenchmarkResults.Add(new BenchmarkResult() { Action = "BulkDelete (Bulk Operations)", Entities = customers.Count(), Performance = clockBulkDelete.ElapsedMilliseconds + " ms" });

            }

        }

        FiddleHelper.WriteTable(BenchmarkResults);

    }

    public static void JustInTime_Compile()

    {

        using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServer()))

        {

            var list = new List<Customer>();

​

            for(int i = 0; i < 20; i++)

            {

                list.Add(new Customer() { Code = "Code_" + i, FirstName = "FirstName_" + i, LastName = "LastName_" + i });

            }

            connection.Open();

            // BulkDelete

            using (var bulk = new BulkOperation<Customer>(connection))

            {

                bulk.DestinationTableName = "Customers";

                bulk.BulkInsert(list);

                // Clean

                bulk.BulkDelete(list);

            }

        }

    }

    public static List<Customer> GenerateCustomers(int count)

    {

        var insertCount = count;

        var list = new List<Customer>();

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

        {

            list.Add(new Customer() { Code = "Code_" + i, FirstName = "FirstName_" + i, LastName = "LastName_" + i });

        }

        using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServer()))

        {       

            connection.Open();

            // BulkInsert

            using (var bulk = new BulkOperation<Customer>(connection))

            {

                bulk.DestinationTableName = "Customers";

                // BulkInsert

                bulk.BulkInsert(list); 

            }

        }

        return list;

    }

​

public static void GenerateDatabase()

    {

        using (var connection = new SqlConnection(FiddleHelper.GetConnectionStringSqlServer()))

        {

            connection.Open();

            using (var command = connection.CreateCommand())

            {

                command.CommandText = @"   

CREATE TABLE [Customers]

(

    [CustomerID] [INT] IDENTITY(1,1) NOT NULL,

    [Code] [NVARCHAR](MAX) NULL,

    [FirstName] [NVARCHAR](MAX) NULL,

    [LastName] [NVARCHAR](MAX) NULL,

    CONSTRAINT [PK_Customers] PRIMARY KEY CLUSTERED 

    (

        [CustomerID] ASC

    )

)

 ";

                command.ExecuteNonQuery();

            }

        }

    }

    public class Customer

    {

        public int CustomerID { get; set; }

        public string Code { get; set; }

        public string FirstName { get; set; }

        public string LastName { get; set; }

    }

    public class BenchmarkResult

    {

        public string Action { get; set; }

        public int Entities { get; set; }

        public string Performance { get; set; }

    }

}