init project

QRCodeService/Application/Queries/GetLinkQueryHandler.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace QRCodeService.Application.Queries
+{
+    public class GetLinkQueryHandler
+    {
+        
+    }
+}

QRCodeService/Application/Queries/ILinkQueries.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace QRCodeService.Application.Queries
+{
+    public interface ILinkQueries
+    {
+        Task<Link> GetLinkAsync(string shortCode);
+    }
+}

QRCodeService/Application/Queries/LinkQueries.cs

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+using MediatR;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Dapper;
+using MySqlConnector;
+
+namespace QRCodeService.Application.Queries
+{
+    public class LinkQueries : ILinkQueries
+    {
+        readonly string _connectionString;
+
+        public LinkQueries(string connectionString)
+        {
+            _connectionString = connectionString;
+        }
+
+        public async Task<Link> GetLinkAsync(string shortCode)
+        {
+            using(var connection = new MySqlConnection(_connectionString))
+            {
+                connection.Open();
+                var link = await connection.QueryAsync<Link>(
+                    @"SELECT A FROM B WHERE ShortCode = @shortCode",new {shortCode });
+                return link.Single();
+            }
+        }
+    }
+}

QRCodeService/Application/Queries/LinkViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace QRCodeService.Application.Queries
+{
+    public class Link
+    {
+        public string ShortCode { get; set; }
+
+        public string FullUrl { get; set; }
+    }
+}