From 21aa0981aef3bbea10bfc4904d8307df3f0e97ff Mon Sep 17 00:00:00 2001
From: Moussa Bourich <moussa.bourich@actiris.be>
Date: Thu, 6 Oct 2022 16:07:35 +0200
Subject: [PATCH] GetAuthors query optimization

---
 BenchmarkService.cs     | 27 ++++++++++++++++++++++++++-
 Context/AppDbContext.cs |  2 +-
 Program.cs              |  5 +++--
 3 files changed, 30 insertions(+), 4 deletions(-)

diff --git a/BenchmarkService.cs b/BenchmarkService.cs
index d0a958d..045e5da 100644
--- a/BenchmarkService.cs
+++ b/BenchmarkService.cs
@@ -88,7 +88,32 @@ public List<AuthorDTO> GetAuthors()
         [Benchmark]
         public List<AuthorDTO> GetAuthors_Optimized()
         {
-            List<AuthorDTO> authors = new List<AuthorDTO>();
+            using var dbContext = new AppDbContext();
+
+            var authors = dbContext.Authors
+                                        .Include(x => x.User)
+                                        .Include(x => x.Books)
+                                        .Where(x => x.Country == "Serbia" && x.Age == 27)
+                                        .OrderByDescending(x => x.BooksCount)
+                                        .Select(x => new AuthorDTO
+                                        {
+                                            UserFirstName = x.User.FirstName,
+                                            UserLastName = x.User.LastName,
+                                            UserEmail = x.User.Email,
+                                            UserName = x.User.UserName,
+                                            BooksCount = x.BooksCount,
+                                            AllBooks = x.Books
+                                            .Where(a => a.Published.Year < 1900)
+                                            .Select(y => new BookDto
+                                            {
+                                                Name = y.Name,
+                                                PublishedYear = y.Published.Year
+                                            }).ToList(),
+                                            AuthorAge = x.Age,
+                                            AuthorCountry = x.Country
+                                        })
+                                        .Take(2)
+                                        .ToList();
 
             return authors;
         }
diff --git a/Context/AppDbContext.cs b/Context/AppDbContext.cs
index a4c4b8b..c0a4f0b 100644
--- a/Context/AppDbContext.cs
+++ b/Context/AppDbContext.cs
@@ -7,7 +7,7 @@ public class AppDbContext : DbContext
     {
         protected override void OnConfiguring(DbContextOptionsBuilder options)
         {
-            options.UseSqlServer("Server=localhost;Database=OptimizeMePlease;Trusted_Connection=True;Integrated Security=true;MultipleActiveResultSets=true");
+            options.UseSqlServer("Server=(localdb)\\MSSQLLocalDB;Database=OptimizeMePlease;Trusted_Connection=True;MultipleActiveResultSets=true");
         }
 
         protected override void OnModelCreating(ModelBuilder modelBuilder)
diff --git a/Program.cs b/Program.cs
index b05ee2d..4bac143 100644
--- a/Program.cs
+++ b/Program.cs
@@ -26,16 +26,17 @@ static void Main(string[] args)
             //Debugging 
             BenchmarkService benchmarkService = new BenchmarkService();
             benchmarkService.GetAuthors();
+            benchmarkService.GetAuthors_Optimized();
 
             //Comment me after first execution, please.
             //IWillPopulateData();
 
-            //BenchmarkRunner.Run<BenchmarkService>();
+            BenchmarkRunner.Run<BenchmarkService>();
         }
 
         public static void IWillPopulateData()
         {
-            string sqlConnectionString = @"Server=localhost;Database=OptimizeMePlease;Trusted_Connection=True;Integrated Security=true;MultipleActiveResultSets=true";
+            string sqlConnectionString = @"Server=(localdb)\MSSQLLocalDB;Database=OptimizeMePlease;Trusted_Connection=True;MultipleActiveResultSets=true";
 
             string workingDirectory = Environment.CurrentDirectory;
             string path = Path.Combine(Directory.GetParent(workingDirectory).Parent.Parent.FullName, @"script.sql");