// Bulk Operations

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

​

// @nuget: Z.BulkOperations

// @nuget: System.Data.SqlClient

​

using System;

using System.Data;

using Z.BulkOperations;

using System.Data.SqlClient;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        GenerateDatabase();

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

        {

            connection.Open();

            var customers = GenerateCustomers(3);

            // SAVE customers

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

            {

                bulk.DestinationTableName = "Customers";

​

                bulk.BulkInsert(customers);

            }

            customers = GenerateCustomers(5);

            // SAVE customers

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

            {

                bulk.DestinationTableName = "Customers";

                bulk.InsertIfNotExists = true;

                bulk.AutoMapKeyExpression = c => c.Code;

                // Customer "C_0", "C_1", "C_2" already exists

                // Customer "C_3", "C_4" are added

                bulk.BulkInsert(customers);

            }

            // SHOW data

            using (var command = connection.CreateCommand())

            {

                command.CommandText = @"

SELECT * FROM Customers

";

                var ds = new DataSet();

                var sqlDataAdapter = new SqlDataAdapter(command);

                sqlDataAdapter.Fill(ds);

                ds.Tables[0].TableName = "1 - Customers";

                FiddleHelper.WriteTable(ds.Tables[0]);

            }

        }

    }

    public static List<Customer> GenerateCustomers(int count) 

    {

        List<Customer>  list = new List<Customer>();

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

        {

            list.Add(new Customer() { CustomerID = 100 + i, Code = "C_" + i, Name = "Customer_" + i});

        }

        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,

    [Name] [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 Name { get; set; }

    }

}