begun sample about connection strings; to be finished

Exemples.sln

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+		p08_BDD_EntityFramework\ReadMe.md = p08_BDD_EntityFramework\ReadMe.md
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+		{097B0926-6663-4B7E-BBBE-DAA7EE278C7C}.Debug|x86.Build.0 = Debug|Any CPU
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+		{097B0926-6663-4B7E-BBBE-DAA7EE278C7C}.Release|ARM64.Build.0 = Release|Any CPU
+		{097B0926-6663-4B7E-BBBE-DAA7EE278C7C}.Release|x64.ActiveCfg = Release|Any CPU
+		{097B0926-6663-4B7E-BBBE-DAA7EE278C7C}.Release|x64.Build.0 = Release|Any CPU
+		{097B0926-6663-4B7E-BBBE-DAA7EE278C7C}.Release|x86.ActiveCfg = Release|Any CPU
+		{097B0926-6663-4B7E-BBBE-DAA7EE278C7C}.Release|x86.Build.0 = Release|Any CPU
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 		{56C5A51B-16E9-4F93-9C32-8F91710391E8} = {65DF0C9A-4F06-4361-8DD9-E8360B6325CA}
+		{AB06CC3B-6D82-48D1-89FC-14C96C77FE7F} = {65DF0C9A-4F06-4361-8DD9-E8360B6325CA}
+		{097B0926-6663-4B7E-BBBE-DAA7EE278C7C} = {56C5A51B-16E9-4F93-9C32-8F91710391E8}
 	EndGlobalSection
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p08_BDD_EntityFramework/ex_041_001_ConnectionStrings/Nounours.cs

@@ -0,0 +1,10 @@
+using System;
+
+namespace ex_041_001_ConnectionStrings
+{
+    class Nounours
+    {
+        public int Id { get; set; }
+        public string Nom { get; set; }
+    }
+}

p08_BDD_EntityFramework/ex_041_001_ConnectionStrings/Program.cs

@@ -0,0 +1,34 @@
+using System;
+
+namespace ex_041_001_ConnectionStrings
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Nounours chewie = new Nounours { Nom = "Chewbacca" };
+            Nounours yoda = new Nounours { Nom = "Yoda" };
+            Nounours ewok = new Nounours { Nom = "Ewok" };
+
+            //using (var context = new SqlServerContext())
+            //{
+            //    // Crée des nounours et les insère dans la base
+            //    Console.WriteLine("Creates and inserts new Nounours");
+            //    context.Add(chewie);
+            //    context.Add(yoda);
+            //    context.Add(ewok);
+            //    context.SaveChanges();
+            //}
+
+            using (var context = new SQLiteContext())
+            {
+                // Crée des nounours et les insère dans la base
+                Console.WriteLine("Creates and inserts new Nounours");
+                context.Add(chewie);
+                context.Add(yoda);
+                context.Add(ewok);
+                context.SaveChanges();
+            }
+        }
+    }
+}

p08_BDD_EntityFramework/ex_041_001_ConnectionStrings/ReadMe.md

@@ -0,0 +1,17 @@
+# ex_041_001_ConnectionStrings
+
+Cet exemple a pour but de présenter les chaîne de connexion (*connection strings*).
+
+Servent à se connecter à une base de données
+diffèrent en fonction des providers
+parfois, elles nécessitent login/pwd_
+
+dans l'exemple :
+2 providers
+pour sqlite, il faut rajouter les nugets, le chemin du starting working directory
+on peut observer le contenu avec DB browser : https://sqlitebrowser.org/dl/
+
+todo : faire fonctionner avec les deux providers
+préciser la différence pour les migrations
+dotnet ef migrations add ex_041_001_ConnectionStrings --context SQLiteContext
+dotnet ef database update --context SQLiteContext

p08_BDD_EntityFramework/ex_041_001_ConnectionStrings/SQLiteContext.cs

@@ -0,0 +1,15 @@
+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace ex_041_001_ConnectionStrings
+{
+    class SQLiteContext : DbContext
+    {
+        public DbSet<Nounours> Nounours { get; set; }
+
+        protected override void OnConfiguring(DbContextOptionsBuilder options)
+            => options.UseSqlite($"Data Source=Nounours.db");
+    }
+}

p08_BDD_EntityFramework/ex_041_001_ConnectionStrings/SqlServerContext.cs

@@ -0,0 +1,12 @@
+using Microsoft.EntityFrameworkCore;
+
+namespace ex_041_001_ConnectionStrings
+{
+    class SqlServerContext : DbContext
+    {
+        public DbSet<Nounours> Nounours { get; set; }
+
+        protected override void OnConfiguring(DbContextOptionsBuilder options)
+            => options.UseSqlServer(@"Server=(localdb)\mssqllocaldb;Database=ex_041_001_ConnectionStrings.Nounours.mdf;Trusted_Connection=True;");
+    }
+}

p08_BDD_EntityFramework/ex_041_001_ConnectionStrings/ex_041_001_ConnectionStrings.csproj

@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <StartWorkingDirectory>$(MSBuildProjectDirectory)</StartWorkingDirectory>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="3.1.0" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="3.1.0" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="3.1.0" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite.Core" Version="3.1.0" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer.Design" Version="1.1.6" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="3.1.0">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+  </ItemGroup>
+</Project>

p08_BDD_EntityFramework/temp.md

@@ -1,8 +1,14 @@
 #### to do
 ##### fundamentals (41)
 * connection strings
-* connection resiliency
+  * exemple avec une connection string dans OnConfiguring
-* testing => sqlite, inmemory
+  * exemple avec une connection string dans AppConfig (WPF) 
+  * exemple avec une connection string appsettings.json (ASP.NET Core)
+  * exemple avec UWP ?
+* connection resiliency ?
+* testing
+  * SQLite in memory
+  * InMemory
 * configuring a dbcontext ?
 * nullable reference types => navigating (include, theninclude)
 ##### creating a model (42)