Added EF7 Bulk example

Author: linkdotnet

EF7Bulk/EF7Bulk.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net7.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="BenchmarkDotNet" Version="0.13.1" />
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="7.0.0-rc.2.22420.3" />
+    </ItemGroup>
+
+</Project>

EF7Bulk/EF7Bulk.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "EF7Bulk", "EF7Bulk.csproj", "{08494CB5-7534-4A75-90C0-43E9EDC4C079}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{08494CB5-7534-4A75-90C0-43E9EDC4C079}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{08494CB5-7534-4A75-90C0-43E9EDC4C079}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{08494CB5-7534-4A75-90C0-43E9EDC4C079}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{08494CB5-7534-4A75-90C0-43E9EDC4C079}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

EF7Bulk/NuGet.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+    <packageSources>
+        <add key="dotnet7" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet7/nuget/v3/index.json" />
+        <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
+    </packageSources>
+</configuration>

EF7Bulk/PeopleContext.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace EF7Bulk;
+
+public class PeopleContext : DbContext
+{
+    public DbSet<Person> People { get; set; } = default!;
+
+    public PeopleContext(DbContextOptions options) : base(options)
+    {
+    }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Person>().HasKey(p => p.Id);
+        modelBuilder.Entity<Person>().Property(p => p.Name)
+            .HasMaxLength(1024)
+            .IsUnicode(false);
+    }
+}

EF7Bulk/Person.cs

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+namespace EF7Bulk;
+
+public class Person
+{
+    public Person(int id, string name, int age)
+    {
+        Id = id;
+        Name = name;
+        Age = age;
+    }
+
+    public int Id { get; set; }
+    public string Name { get; set; }
+    public int Age { get; set; }
+}

EF7Bulk/Program.cs

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+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Running;
+using EF7Bulk;
+using Microsoft.Data.Sqlite;
+using Microsoft.EntityFrameworkCore;
+
+BenchmarkRunner.Run<UpdateBenchmark>();
+
+[MemoryDiagnoser]
+public class UpdateBenchmark
+{
+    private PeopleContext _peopleContext;
+
+    [Params(100, 1_000)] public int RowsToUpdate { get; set; }
+
+    [GlobalSetup]
+    public void Setup()
+    {
+        _peopleContext = CreateContext();
+        CreateContext();
+        FillWithData();
+    }
+
+    [Benchmark(Baseline = true)]
+    public async Task OneByOneUpdate()
+    {
+        var entries = await _peopleContext.People.ToListAsync();
+        foreach (var entry in entries)
+        {
+            entry.Age = 21;
+        }
+
+        await _peopleContext.SaveChangesAsync();
+    }
+
+    [Benchmark]
+    public async Task BulkUpdate()
+    {
+        await _peopleContext.People
+            .ExecuteUpdateAsync(s => s.SetProperty(p => p.Age, p => 21));
+    }
+
+    private void FillWithData()
+    {
+        using var context = CreateContext();
+        context.Database.EnsureCreated();
+        for (var i = 1; i <= RowsToUpdate; i++)
+            context.People.Add(new Person(i, "Steven", 31));
+
+        context.SaveChanges();
+    }
+
+    private static PeopleContext CreateContext()
+    {
+        var connection = new SqliteConnection("DataSource=myshareddb;mode=memory;cache=shared");
+        connection.Open();
+        var options = new DbContextOptionsBuilder()
+            .UseSqlite(connection)
+            .Options;
+        return new PeopleContext(options);
+    }
+}