.NET Core下有很多热门的ORM框架,以下是其中六个常用的框架,包括EF Core、Dapper、NHibernate、Fluent NHibernate、LLBLGen Pro和PetaPoco。接下来,我将为您详细介绍每个框架的优缺点,并提供示例代码演示如何使用。
示例代码:
// 定义模型类public class Product{public int Id { get; set; }public string Name { get; set; }public decimal Price { get; set; }}// 创建DbContextpublic class MyDbContext : DbContext{public DbSet<Product> Products { get; set; }protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder){optionsBuilder.UseSqlServer("connectionString");}}// 查询数据using (var dbContext = new MyDbContext()){var products = dbContext.Products.Where(p => p.Price > 10).ToList();}// 插入数据using (var dbContext = new MyDbContext()){var newProduct = new Product { Name = "New Product", Price = 20 };dbContext.Products.Add(newProduct);dbContext.SaveChanges();}
示例代码:
// 查询数据using (var connection = new SqlConnection("connectionString")){var products = connection.Query<Product>("SELECT * FROM Products WHERE Price > @Price", new { Price = 10 }).ToList();}// 插入数据using (var connection = new SqlConnection("connectionString")){var newProduct = new Product { Name = "New Product", Price = 20 };connection.Execute("INSERT INTO Products (Name, Price) VALUES (@Name, @Price)", newProduct);}
示例代码:
// 定义映射文件public class ProductMap : ClassMapping<Product>{public ProductMap(){Id(x => x.Id, map => map.Generator(Generators.Identity));Property(x => x.Name);Property(x => x.Price);Table("Products");}}// 创建SessionFactoryvar configuration = new Configuration();configuration.Configure(); // 加载配置文件configuration.AddMapping(typeof(ProductMap)); // 添加映射文件var sessionFactory = configuration.BuildSessionFactory();// 查询数据using (var session = sessionFactory.OpenSession()){using (var transaction = session.BeginTransaction()){var products = session.Query<Product>().Where(p => p.Price > 10).ToList();transaction.Commit();}}// 插入数据using (var session = sessionFactory.OpenSession()){using (var transaction = session.BeginTransaction()){var newProduct = new Product { Name = "New Product", Price = 20 };session.Save(newProduct);transaction.Commit();}}
示例代码:
// 定义映射类public class ProductMap : ClassMap<Product>{public ProductMap(){Id(x => x.Id);Map(x => x.Name);Map(x => x.Price);Table("Products");}}// 创建SessionFactoryvar sessionFactory = Fluently.Configure().Database(MsSqlConfiguration.MsSql2012.ConnectionString("connectionString")).Mappings(m => m.FluentMappings.AddFromAssemblyOf<ProductMap>()).BuildSessionFactory();// 查询数据using (var session = sessionFactory.OpenSession()){using (var transaction = session.BeginTransaction()){var products = session.Query<Product>().Where(p => p.Price > 10).ToList();transaction.Commit();}}// 插入数据using (var session = sessionFactory.OpenSession()){using (var transaction = session.BeginTransaction()){var newProduct = new Product { Name = "New Product", Price = 20 };session.Save(newProduct);transaction.Commit();}}
示例代码:
// 定义模型类[Serializable][DataEntity(IsGenerated = true)]public partial class Product : EntityBase{[DataField(IsPrimaryKey = true, IsIdentity = true)]public int Id { get; set; }[DataField]public string Name { get; set; }[DataField]public decimal Price { get; set; }}// 查询数据using (var adapter = new DataAccessAdapter()){var products = adapter.FetchQuery<Product>(new RelationPredicateBucket(ProductFields.Price > 10));}// 插入数据using (var adapter = new DataAccessAdapter()){var newProduct = new Product { Name = "New Product", Price = 20 };adapter.SaveEntity(newProduct);}
示例代码:
// 查询数据using (var db = new Database("connectionString")){ var products = db.Query<Product>("SELECT * FROM Products WHERE Price > @0", 10);}// 插入数据using (var db = new Database("connectionString")){ var newProduct = new Product { Name = "New Product", Price = 20 }; db.Insert(newProduct);}
以上是几种常见的.NET ORM框架,每种框架都有其特点和适用场景。选择合适的框架需要根据项目需求、团队经验和个人偏好来决定。如果需要更高级的功能和更好的性能,可以考虑使用商业级的ORM框架,如Entity Framework Core、LLBLGen Pro等。如果对性能要求较高,可以考虑使用轻量级的框架,如Dapper、PetaPoco等。
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