// Dapper Plus

// Doc: https://dapper-plus.net/bulk-merge

​

// @nuget: Dapper

// @nuget: Microsoft.Data.SqlClient

// @nuget: Z.Dapper.Plus

​

using System.Collections.Generic;

using System.ComponentModel.DataAnnotations;

using System.ComponentModel.DataAnnotations.Schema;

using System.Linq;

using Microsoft.Data.SqlClient;

using Dapper;

using Z.Dapper.Plus;

​

public class Program

{   

    public static void Main()

    {

        // Map your entity

        DapperPlusManager.Entity<Product>()

            .Table("Product")

            .Identity(x => x.ProductID)

            .UseBulkOptions(x => {

                x.MergeMatchedAndOneNotConditionExpression = y => new { y.Name };

            });

        var products = new List<Product>();

        products.Add(new Product() { ProductID = 13, Name = "Dapper Plus", Description = @"Use <a href=""https://dapper-plus.net/"" target=""_blank"">Dapper Plus</a> to extend your IDbConnection with high-performance bulk operations." });

        products.Add(new Product() { ProductID = 66, Name = "C# Eval Expression", Description = @"Use <a href=""https://eval-expression.net/"" target=""_blank"">C# Eval Expression</a> to compile and execute C# code at runtime." });

        products.Add(new Product() { ProductID = 99, Name = "Entity Framework Extensions", Description = @"Use <a href=""https://entityframework-extensions.net/"" target=""_blank"">Entity Framework Extensions</a> to extend your DbContext with high-performance bulk operations." });

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

        connection.CreateTable<Product>();

        // Seed

        connection.BulkInsert(products.Take(2));

        FiddleHelper.WriteTable("1 - Product Before", connection.Query<Product>("SELECT * FROM Product"));

        // Change one name (only this row will be updated as the value is different)

        products[0].Name += " (New Name)";

        products[0].Description = "The description for product[0] is modified as the name is different";

        products[1].Description = "The description for product[1] is not modified as the name is the same";

​

        // Merge

        connection.BulkMerge(products);

        // Query data with Dapper

        FiddleHelper.WriteTable("2 - Product After", connection.Query<Product>("SELECT * FROM Product"));

    }

    [Table("Product")]

    public class Product

    {

        [Key]

        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]

        public int ProductID { get; set; }

        public string Name { get; set; }

        public string Description { get; set; }

    }

}