idk something about efcore

SurveyBackend/SurveyBackend.Infrastructure/Data/DataContext.cs

@@ -0,0 +1,15 @@
+using Microsoft.EntityFrameworkCore;
+using SurveyBackend.Core.Models;
+
+namespace SurveyBackend.Infrastructure.Data;
+
+public class DataContext : DbContext
+{
+    public DbSet<User> Users { get; set; }
+    public DbSet<Group> Groups { get; set; }
+
+    public DataContext(DbContextOptions<DataContext> options) : base(options)
+    {
+        Database.EnsureCreated();
+    }
+}

SurveyBackend/SurveyBackend.Infrastructure/Repositories/UserRepository.cs

@@ -0,0 +1,44 @@
+using Microsoft.EntityFrameworkCore;
+using SurveyBackend.Core.Models;
+using SurveyBackend.Core.Repositories;
+using SurveyBackend.Infrastructure.Data;
+
+namespace SurveyBackend.Infrastructure.Repositories;
+
+public class UserRepository : IUserRepository
+{
+    private readonly DataContext _context;
+
+    public UserRepository(DataContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<User?> GetByIdAsync(int id)
+    {
+        return await _context.Users.FindAsync(id);
+    }
+
+    public async Task<IEnumerable<User>> GetAllAsync()
+    {
+        return await _context.Users.ToListAsync();
+    }
+
+    public async Task AddAsync(User entity)
+    {
+        await _context.Users.AddAsync(entity);
+        await _context.SaveChangesAsync();
+    }
+
+    public async Task UpdateAsync(User entity)
+    {
+        _context.Users.Update(entity);
+        await _context.SaveChangesAsync();
+    }
+
+    public async Task DeleteAsync(User entity)
+    {
+        _context.Users.Remove(entity);
+        await _context.SaveChangesAsync();
+    }
+}

SurveyBackend/SurveyBackend.Infrastructure/SurveyBackend.Infrastructure.csproj

@@ -6,4 +6,12 @@
         <Nullable>enable</Nullable>
     </PropertyGroup>
 
+    <ItemGroup>
+      <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.3" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\SurveyBackend.Core\SurveyBackend.Core.csproj" />
+    </ItemGroup>
+
 </Project>