// Learn Dapper

// Doc: https://www.learndapper.com/dapper-query/selecting-scalar-values#dapper-executescalarasync

​

// @nuget: Dapper

// @nuget: Microsoft.Data.SqlClient

// @nuget: Z.Dapper.Plus

​

using System;

using System.Collections.Generic;

using System.ComponentModel.DataAnnotations;

using System.ComponentModel.DataAnnotations.Schema;

using System.Threading.Tasks;

using System.Linq;

using Microsoft.Data.SqlClient;

using Dapper;

using Z.Dapper.Plus;

​

public class Program

{   

    public static async Task Main()

    {

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

        // CREATE database and data seeding

        {

            // CREATE Table (from Dapper Plus)

            connection.CreateTable<Product>();

            var seedProducts = new List<Product>();

            seedProducts.Add(new Product() { Name = "Dapper Plus", CategoryID = 1, Description = @"Use <a href=""https://dapper-plus.net/"" target=""_blank"">Dapper Plus</a> to extend your IDbConnection with high-performance bulk operations." });

            seedProducts.Add(new Product() { Name = "C# Eval Expression", CategoryID = 2, Description = @"Use <a href=""https://eval-expression.net/"" target=""_blank"">C# Eval Expression</a> to compile and execute C# code at runtime." });

            seedProducts.Add(new Product() { Name = "Entity Framework Extensions", CategoryID = 1, Description = @"Use <a href=""https://entityframework-extensions.net/"" target=""_blank"">Entity Framework Extensions</a> to extend your DbContext with high-performance bulk operations." });

            // BulkInsert data (from Dapper Plus)

            connection.BulkInsert(seedProducts);

        }

​

        // Query data with Dapper

        var sql = "SELECT COUNT(*) FROM Product";

        var count = await connection.ExecuteScalarAsync<int>(sql);

        Console.WriteLine($"Total products: {count}");

    }

    [Table("Product")]

    public class Product

    {

        [Key]

        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]

        public int ProductID { get; set; }

        public int CategoryID { get; set; }

        public string Name { get; set; }

        public string Description { get; set; }     

    }

}