나만의 ASP.NET 프레임워크(2)

 

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🚀 [2단계] 핵심 목표: 데이터 계층(Data Layer) 추가

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🧱 새로운 프로젝트 추가: HyochulLab.Data

📌 Visual Studio에서 새 Class Library 추가

• 프로젝트 이름: HyochulLab.Data
• 프레임워크: .NET 8
• 참조 추가:
  • HyochulLab.Core

📦 NuGet 패키지 설치

dotnet add package Microsoft.EntityFrameworkCore
dotnet add package Microsoft.EntityFrameworkCore.SqlServer
dotnet add package Microsoft.EntityFrameworkCore.Abstractions

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📂 기본 폴더 구조

HyochulLab.Data/
├── Context/
│   └── AppDbContext.cs
├── Entities/
│   └── User.cs
├── Interfaces/
│   └── IRepository.cs
├── Repositories/
│   └── Repository.cs
└── UnitOfWork/
    └── UnitOfWork.cs

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✅ 핵심 구성 예시

1. 📁 Entities/User.cs

namespace HyochulLab.Data.Entities;

public class User
{
    public int Id { get; set; }
    public string Name { get; set; } = string.Empty;
    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
}

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2. 📁 Context/AppDbContext.cs

using Microsoft.EntityFrameworkCore;
using HyochulLab.Data.Entities;

namespace HyochulLab.Data.Context;

public class AppDbContext : DbContext
{
    public AppDbContext(DbContextOptions<AppDbContext> options)
        : base(options) { }

    public DbSet<User> Users => Set<User>();
}

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3. 📁 Interfaces/IRepository.cs

using System.Linq.Expressions;

namespace HyochulLab.Data.Interfaces;

public interface IRepository<T> where T : class
{
    Task<T?> GetAsync(Expression<Func<T, bool>> predicate);
    Task<IEnumerable<T>> GetAllAsync();
    Task AddAsync(T entity);
    void Remove(T entity);
}

---

4. 📁 Repositories/Repository.cs

using Microsoft.EntityFrameworkCore;
using System.Linq.Expressions;
using HyochulLab.Data.Interfaces;
using HyochulLab.Data.Context;

namespace HyochulLab.Data.Repositories;

public class Repository<T> : IRepository<T> where T : class
{
    private readonly AppDbContext _context;
    private readonly DbSet<T> _dbSet;

    public Repository(AppDbContext context)
    {
        _context = context;
        _dbSet = context.Set<T>();
    }

    public async Task<T?> GetAsync(Expression<Func<T, bool>> predicate) =>
        await _dbSet.FirstOrDefaultAsync(predicate);

    public async Task<IEnumerable<T>> GetAllAsync() =>
        await _dbSet.ToListAsync();

    public async Task AddAsync(T entity) => await _dbSet.AddAsync(entity);

    public void Remove(T entity) => _dbSet.Remove(entity);
}

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5. 📁 UnitOfWork/UnitOfWork.cs

using HyochulLab.Data.Context;
using HyochulLab.Data.Interfaces;
using HyochulLab.Data.Repositories;

namespace HyochulLab.Data.UnitOfWork;

public class UnitOfWork : IUnitOfWork
{
    private readonly AppDbContext _context;

    public IRepository<User> Users { get; }

    public UnitOfWork(AppDbContext context)
    {
        _context = context;
        Users = new Repository<User>(context);
    }

    public async Task<int> SaveChangesAsync() => await _context.SaveChangesAsync();
}

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🧪 다음 단계 예고

다음엔 SampleApp에서:

• appsettings.json에 DB 연결 문자열 추가
• Program.cs에서 DbContext, UnitOfWork DI 등록
• UserController 만들어서 DB CRUD 테스트