// Bulk Operations

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

​

// @nuget: Z.BulkOperations

​

using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.Data;

using System.Data.DataSetExtensions;

using System.Data.SqlClient;

using System.Linq;

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();

        var dtCustomers = GenerateCustomers(customerCount);

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

        {

            connection.Open();

            // BulkMerge 

            using (var bulk = new BulkOperation(connection))

            {

                bulk.DestinationTableName = "Customers";

                bulk.AutoMapOutputDirection = false;

                clockBulkDelete.Start();

                bulk.BulkDelete(dtCustomers); 

                clockBulkDelete.Stop();

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

            }

        }

        FiddleHelper.WriteTable(BenchmarkResults);

    }

    public static void JustInTime_Compile()

    {       

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

        {

            connection.Open();

            DataTable dtCustomers = new DataTable("Customers");

​

            dtCustomers.Columns.Add("CustomerID", typeof(int));

            dtCustomers.Columns.Add("Code", typeof(string)); 

            dtCustomers.Columns.Add("FirstName", typeof(string)); 

            dtCustomers.Columns.Add("LastName", typeof(string)); 

​

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

            {

                var drCustomer = dtCustomers.NewRow();  

                drCustomer["Code"] = "Code_" + i;  

                drCustomer["FirstName"] = "FirstName_" + i;  

                drCustomer["LastName"] ="LastName_" + i;  

​

                dtCustomers.Rows.Add(drCustomer);

            }

            // BulkDelete 

            using (var bulk = new BulkOperation(connection))

            {

                bulk.DestinationTableName = "Customers";

                bulk.AutoMapOutputDirection = false;

                bulk.BulkInsert(dtCustomers);

                // Clean

                bulk.BulkDelete(dtCustomers);

            }

        }

    }

    public static DataTable GenerateCustomers(int count) 

    {

        var insertCount = count;

        DataTable dtTable = new DataTable("Customers");

        dtTable.Columns.Add("CustomerID", typeof(int));

        dtTable.Columns.Add("Code", typeof(string)); 

        dtTable.Columns.Add("FirstName", typeof(string)); 

        dtTable.Columns.Add("LastName", typeof(string)); 

​

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

        {

            var drCustomer = dtTable.NewRow();  

            drCustomer["Code"] = "Code_" + i;  

            drCustomer["FirstName"] = "FirstName_" + i;  

            drCustomer["LastName"] ="LastName_" + i;  

​

            dtTable.Rows.Add(drCustomer);

        }

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

        {

            connection.Open();

            // BulkInsert

            using (var bulk = new BulkOperation(connection))

            {

                bulk.DestinationTableName = "Customers";

                bulk.BulkInsert(dtTable);

            }

        }

        return dtTable;

    }

​

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 BenchmarkResult

    {

        public string Action { get; set; }

        public int Entities { get; set; }

        public string Performance { get; set; }

    }

}