Merge pull request #6 from Star-Academy/EFCore

complete EFCore practice

EFCore/EFCore.csproj

@@ -0,0 +1,18 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net8.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="8.0.1">
+        <PrivateAssets>all</PrivateAssets>
+        <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      </PackageReference>
+      <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="8.0.1" />
+    </ItemGroup>
+
+</Project>

EFCore/Model.cs

@@ -0,0 +1,34 @@
+using Microsoft.EntityFrameworkCore;
+
+public class BloggingContext : DbContext
+{
+    public DbSet<Blog>? Blogs { get; set; }
+    public DbSet<Post>? Posts { get; set; }
+
+
+    // The following configures EF to create a Sqlite database file in the
+    // special "local" folder for your platform.
+    protected override void OnConfiguring(DbContextOptionsBuilder options)
+        => options.UseNpgsql("User ID=postgres;Password=1234;" +
+                             "Host=localhost;Port=5432;Database=staracademy;" +
+                             "Connection Lifetime=0;");
+}
+
+public class Blog
+{
+    public string BlogId { get; set; }
+    public string? Url { get; set; }
+
+    public List<Post>? Posts { get; } = new();
+}
+
+public class Post
+{
+
+    public string PostId { get; set; }
+    public string? Title { get; set; }
+    public string? Content { get; set; }
+
+    public int BlogId { get; set; }
+    public Blog? Blog { get; set; }
+}

EFCore/Program.cs

@@ -0,0 +1,35 @@
+using var db = new BloggingContext();
+
+// Create
+Console.WriteLine("Inserting a new blog");
+Blog firstBlog = new Blog
+{
+    BlogId = Guid.NewGuid().ToString(),
+    Url = "http://blogs.msdn.com/adonet"
+};
+
+db.Add(firstBlog);
+db.SaveChanges();
+
+// Read
+Console.WriteLine("Querying for a blog");
+var blog = db.Blogs
+    .OrderBy(b => b.BlogId)
+    .First();
+
+// Update
+Console.WriteLine("Updating the blog and adding a post");
+blog.Url = "https://devblogs.microsoft.com/dotnet";
+Post post = new Post
+{
+    Title = "Hello World",
+    Content = "I wrote an app using EF Core!",
+    PostId = Guid.NewGuid().ToString(),
+};
+blog.Posts!.Add(post);
+db.SaveChanges();
+
+// Delete
+Console.WriteLine("Delete the blog");
+db.Remove(blog);
+db.SaveChanges();

Folder.DotSettings.user

@@ -5,6 +5,6 @@
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+
 
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