Entity Framework
Entity Framework: چارچوبی برای دسترسی به دادهها در .NET
Entity Framework (EF) یک چارچوب ORM (Object-Relational Mapper) است که توسط مایکروسافت برای [.NET] توسعه داده شده است. این چارچوب به توسعهدهندگان این امکان را میدهد تا با پایگاههای داده به صورت شیگرا تعامل داشته باشند، بدون نیاز به نوشتن کد SQL دستی. به عبارت دیگر، EF یک لایه انتزاعی بین کد برنامه و پایگاه داده ایجاد میکند که مدیریت پیچیدگیهای دسترسی به دادهها را بر عهده دارد.
تاریخچه و نسخهها
Entity Framework در سال 2006 به عنوان بخشی از [.NET Framework 3.5] معرفی شد. هدف اصلی آن سادهسازی توسعه برنامههای کاربردی مبتنی بر داده بود. از آن زمان، EF به طور مداوم تکامل یافته و نسخههای مختلفی از آن منتشر شده است:
- Entity Framework 1.0 - 3.5: اولین نسخه که قابلیتهای اساسی ORM را ارائه میداد.
- Entity Framework 4.0: همراه با [.NET Framework 4] منتشر شد و ویژگیهای جدیدی مانند پشتیبانی از مدلهای مفهوم و LINQ به Entity اضافه کرد.
- Entity Framework 5.0: بهبودهای عملکردی و مقیاسپذیری را به همراه داشت.
- Entity Framework 6.x: آخرین نسخه از EF که بر روی پایداری و بهبود عملکرد تمرکز داشت.
- Entity Framework Core (EF Core): یک بازنویسی کامل از EF که برای [.NET Core] و [.NET 5+] طراحی شده است. EF Core سبکتر، ماژولارتر و قابل حملتر است.
مفاهیم کلیدی
برای درک بهتر Entity Framework، باید با مفاهیم کلیدی آن آشنا شوید:
- مدل مفهومی (Conceptual Model): یک نمایش انتزاعی از دادهها که توسط توسعهدهنده تعریف میشود. این مدل شامل Entity ها، روابط بین آنها و ویژگیهای هر Entity است.
- مدل ذخیرهسازی (Storage Model): نمایش فیزیکی پایگاه داده، شامل جداول، ستونها، کلیدهای اصلی و خارجی و روابط بین جداول.
- نگاشت مدل (Model Mapping): فرآیند تعریف نحوه ارتباط بین مدل مفهومی و مدل ذخیرهسازی. EF از این نگاشت برای تبدیل درخواستهای LINQ به SQL و تبدیل نتایج SQL به اشیاء .NET استفاده میکند.
- Entity ها (Entities): نمایندگان شیگرا از ردیفهای موجود در جداول پایگاه داده.
- DbContext (متن داده): کلاسی که به عنوان نقطه ورود به پایگاه داده عمل میکند. DbContext مسئول مدیریت ارتباط با پایگاه داده، ردیابی تغییرات در Entity ها و ذخیره این تغییرات در پایگاه داده است.
- LINQ to Entities : یک افزونه به [.LINQ] که به شما امکان میدهد با استفاده از زبان LINQ (Language Integrated Query) به پایگاه داده دسترسی پیدا کنید و دادهها را بازیابی کنید.
مزایای استفاده از Entity Framework
استفاده از Entity Framework مزایای متعددی دارد:
- توسعه سریعتر: EF با حذف نیاز به نوشتن کد SQL دستی، سرعت توسعه برنامههای کاربردی مبتنی بر داده را افزایش میدهد.
- افزایش بهرهوری: توسعهدهندگان میتوانند بر روی منطق تجاری برنامه تمرکز کنند و دغدغههای مربوط به دسترسی به دادهها را به EF واگذار کنند.
- کاهش خطاها: EF با تولید خودکار کد SQL، احتمال بروز خطاهای مربوط به SQL را کاهش میدهد.
- 'قابلیت حمل (Portability): EF از پایگاههای داده مختلف پشتیبانی میکند، بنابراین میتوانید برنامه خود را به راحتی به پایگاه داده دیگری منتقل کنید.
- امنیت: EF به جلوگیری از حملات SQL Injection کمک میکند.
- قابلیت تست: EF با ارائه یک لایه انتزاعی، تست کد برنامه را آسانتر میکند.
معایب استفاده از Entity Framework
با وجود مزایای فراوان، Entity Framework معایبی نیز دارد:
- عملکرد: در برخی موارد، EF میتواند کندتر از نوشتن کد SQL دستی باشد. این موضوع به ویژه در مورد پرس و جوهای پیچیده صادق است.
- پیچیدگی: EF میتواند برای مبتدیان پیچیده باشد. درک مفاهیم کلیدی و نحوه کارکرد EF نیاز به زمان و تلاش دارد.
- کنترل کمتر: EF کنترل کمتری بر روی کد SQL تولید شده ارائه میدهد. این موضوع میتواند برای توسعهدهندگانی که نیاز به بهینهسازی دقیق پرس و جوها دارند، مشکلساز باشد.
نحوه کارکرد Entity Framework
فرآیند دسترسی به دادهها با استفاده از Entity Framework به شرح زیر است:
1. تعریف مدل مفهومی : با استفاده از یک ابزار مانند Entity Framework Designer یا Code First، مدل مفهومی را تعریف کنید. 2. ایجاد DbContext : یک کلاس DbContext ایجاد کنید که مسئول مدیریت ارتباط با پایگاه داده باشد. 3. بازیابی دادهها با LINQ to Entities : از LINQ to Entities برای نوشتن پرس و جوهایی که دادهها را از پایگاه داده بازیابی میکنند، استفاده کنید. 4. ذخیره تغییرات : تغییرات ایجاد شده در Entity ها را با استفاده از متد SaveChanges() در DbContext ذخیره کنید.
رویکردهای توسعه با Entity Framework
دو رویکرد اصلی برای توسعه با Entity Framework وجود دارد:
- Database First : در این رویکرد، ابتدا پایگاه داده را طراحی میکنید و سپس EF مدل مفهومی را بر اساس پایگاه داده موجود ایجاد میکند.
- Code First : در این رویکرد، ابتدا مدل مفهومی را در کد C# تعریف میکنید و سپس EF مدل ذخیرهسازی را بر اساس مدل مفهومی ایجاد میکند.
نمونه کد (Code First)
در اینجا یک نمونه کد ساده از نحوه استفاده از Entity Framework با رویکرد Code First آورده شده است:
```csharp using System; using System.Linq; using Microsoft.EntityFrameworkCore;
// تعریف یک Entity public class Product {
public int ProductId { get; set; } public string Name { get; set; } public decimal Price { get; set; }
}
// تعریف DbContext public class ProductContext : DbContext {
public DbSet<Product> Products { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) { optionsBuilder.UseSqlServer("Server=(localdb)\\mssqllocaldb;Database=MyDatabase;Trusted_Connection=True;"); }
}
public class Example {
public static void Main(string[] args) { // ایجاد یک نمونه از DbContext using (var context = new ProductContext()) { // افزودن یک محصول جدید context.Products.Add(new Product { Name = "Laptop", Price = 1200.00M });
// ذخیره تغییرات در پایگاه داده context.SaveChanges();
// بازیابی همه محصولات var products = context.Products.ToList();
// نمایش محصولات foreach (var product in products) { Console.WriteLine($"Product ID: {product.ProductId}, Name: {product.Name}, Price: {product.Price}"); } } }
} ```
بهینهسازی عملکرد Entity Framework
برای بهبود عملکرد Entity Framework، میتوانید از تکنیکهای زیر استفاده کنید:
- استفاده از ایندکسها (Indexes): ایجاد ایندکسها در ستونهایی که به طور مکرر در پرس و جوها استفاده میشوند، میتواند سرعت بازیابی دادهها را افزایش دهد.
- استفاده از AsNoTracking() : اگر نیازی به ردیابی تغییرات در Entity ها ندارید، از متد AsNoTracking() برای جلوگیری از سربار ردیابی استفاده کنید.
- استفاده از Compile Queries : پرس و جوهای مکرر را کامپایل کنید تا از تولید مجدد آنها جلوگیری شود.
- استفاده از Projection : فقط ستونهای مورد نیاز را در پرس و جوها انتخاب کنید.
- استفاده از Stored Procedures : در برخی موارد، استفاده از Stored Procedures میتواند عملکرد بهتری نسبت به LINQ to Entities ارائه دهد.
- Lazy Loading را با دقت استفاده کنید : استفاده بیش از حد از Lazy Loading میتواند منجر به مشکل N+1 Select شود.
تحلیل فنی و استراتژیهای مرتبط
- تحلیل حجم معاملات (Volume Analysis) : درک حجم معاملات پایگاه داده میتواند در بهینهسازی پرس و جوها و انتخاب استراتژیهای مناسب برای دسترسی به دادهها کمک کند.
- تحلیل الگوهای دسترسی به دادهها (Data Access Patterns): شناسایی الگوهای دسترسی به دادهها میتواند به شما کمک کند تا مدل مفهومی و نگاشت مدل را بهینه کنید.
- استفاده از Cache : Caching دادهها میتواند سرعت دسترسی به دادهها را افزایش دهد.
- Partitioning (پارتیشنبندی) : پارتیشنبندی جداول بزرگ میتواند عملکرد را بهبود بخشد.
- Index Tuning (بهینهسازی ایندکسها) : به طور منظم ایندکسها را بررسی و بهینهسازی کنید.
منابع بیشتر
- مستندات رسمی Entity Framework Core: [[۱]]
- Microsoft Learn - Entity Framework Core: [[۲]]
- Entity Framework Tutorial: [[۳]]
LINQ .NET Framework .NET Core .NET 5+ SQL Injection Object-Oriented Programming ORM (Object-Relational Mapper) Database Design Database Normalization SQL Server MySQL PostgreSQL Data Modeling Data Access Layer Repository Pattern Unit of Work Pattern Dependency Injection Asynchronous Programming Concurrency Control Transaction Management Performance Tuning Caching Strategies Database Indexing Stored Procedures Query Optimization Volume Analysis Data Access Patterns Index Tuning Partitioning Caching
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Management Skills Legal Management Skills Public Relations Skills Government Affairs Skills Lobbying Skills Corporate Social Responsibility Skills Sustainability Reporting Skills Environmental Impact Assessment Skills Social Impact Assessment Skills Stakeholder Engagement Skills Community Outreach Skills Philanthropy Skills Volunteerism Skills Social Entrepreneurship Skills Impact Investing Skills Ethical Sourcing Skills Fair Trade Skills Sustainable Development Goals Skills Global Compact Skills B Corp Certification Skills Carbon Neutrality Skills Zero Waste Skills Circular Economy Skills Renewable Energy Skills Energy Efficiency Skills Water Conservation Skills Waste Reduction Skills Pollution Prevention Skills Climate Change Mitigation Skills Climate Change Adaptation Skills Biodiversity Conservation Skills Deforestation Prevention Skills Ocean Conservation Skills Sustainable Agriculture Skills Sustainable Fisheries Skills Sustainable Forestry Skills Sustainable Tourism Skills 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BitMEX | پلتفرم رمزارزها، اهرم تا ۱۰۰x | BitMEX |
به جامعه ما بپیوندید
در کانال تلگرام @strategybin عضو شوید برای اطلاعات بیشتر. بهترین پلتفرمهای سودآور – همین حالا ثبتنام کنید.
در جامعه ما شرکت کنید
در کانال تلگرام @cryptofuturestrading عضو شوید برای تحلیل، سیگنالهای رایگان و موارد بیشتر!