капец

ClassLibrary1.sln

@@ -9,6 +9,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Test", "Test\Test.csproj",
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BussinessLogick", "BussinessLogick\BussinessLogick.csproj", "{D098214E-146D-4B68-9EF7-89F5DB610CB7}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DataBase", "DataBase\DataBase.csproj", "{608AC528-CB79-4E4E-BFF6-7EF154A56F6C}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -27,6 +29,10 @@ Global
 		{D098214E-146D-4B68-9EF7-89F5DB610CB7}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{D098214E-146D-4B68-9EF7-89F5DB610CB7}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{D098214E-146D-4B68-9EF7-89F5DB610CB7}.Release|Any CPU.Build.0 = Release|Any CPU
+		{608AC528-CB79-4E4E-BFF6-7EF154A56F6C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{608AC528-CB79-4E4E-BFF6-7EF154A56F6C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{608AC528-CB79-4E4E-BFF6-7EF154A56F6C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{608AC528-CB79-4E4E-BFF6-7EF154A56F6C}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

ClassLibrary1/ClassLibrary1.csproj

@@ -6,4 +6,11 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="9.0.5">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+  </ItemGroup>
+
 </Project>

ClassLibrary1/IConfigurationDatabase.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ClassLibrary1;
+
+public interface IConfigurationDatabase
+{
+    string ConnectionString { get; }
+}

ClassLibrary1/Program.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ClassLibrary1;
+
+public class Program
+{
+    public static void Main(string[] args)
+    {
+    }
+}

DataBase/Article.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DataBase;
+
+internal class Article
+{
+    [Key]
+    public required string Id { get; set; }
+    public required string Title { get; set; }
+    public required string Tema { get; set; }
+    public DateTime DateCreat { get; set; }
+
+    [ForeignKey("ArticleId")]
+    public List<Author>? Authors { get; set; }
+}

DataBase/Author.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DataBase;
+
+internal class Author
+{
+    [Key]
+    public required string Id { get; set; }
+    public required string FIO { get; set; }
+    public required string Email { get; set; }
+    public DateTime BirthDate { get; set; }
+    public required string Work { get; set; }
+    public required string ArticleId { get; set; }
+
+    [ForeignKey("ArticleId")]
+    public Article? Article { get; set; }
+}

DataBase/DataBase.csproj

@@ -0,0 +1,27 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.5" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="9.0.5">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="9.0.5" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="9.0.5">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="9.0.4" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ClassLibrary1\ClassLibrary1.csproj" />
+  </ItemGroup>
+
+</Project>

DataBase/DefaultConfigurationDatabase.cs

@@ -0,0 +1,13 @@
+using ClassLibrary1;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DataBase;
+
+class DefaultConfigurationDatabase : IConfigurationDatabase
+{
+    public string ConnectionString => "";
+}

DataBase/LibraryDbContext.cs

@@ -0,0 +1,45 @@
+using ClassLibrary1;
+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection.Emit;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DataBase;
+
+internal class LibraryDbContext : DbContext
+{
+    private readonly IConfigurationDatabase? _configurationDatabase;
+
+    public LibraryDbContext(IConfigurationDatabase configurationDatabase)
+    {
+        _configurationDatabase = configurationDatabase;
+    }
+
+
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+    {
+        optionsBuilder.UseNpgsql(_configurationDatabase?.ConnectionString, o => o.SetPostgresVersion(12, 2));
+        base.OnConfiguring(optionsBuilder);
+    }
+
+
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        base.OnModelCreating(modelBuilder);
+
+        modelBuilder.Entity<Author>().HasIndex(x => x.Email).IsUnique();
+
+        modelBuilder.Entity<Author>()
+            .HasOne(a => a.Article)
+            .WithMany(a => a.Authors)
+            .HasForeignKey(a => a.ArticleId)
+            .OnDelete(DeleteBehavior.Restrict);
+    }
+
+    public DbSet<Article> Articles { get; set; }
+    public DbSet<Author> Authors { get; set; }
+}

DataBase/SampleContextFactory.cs

@@ -0,0 +1,17 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Design;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DataBase;
+
+internal class SampleContextFactory : IDesignTimeDbContextFactory<LibraryDbContext>
+{
+    public LibraryDbContext CreateDbContext(string[] args)
+    {
+        return new LibraryDbContext(new DefaultConfigurationDatabase());
+    }
+}