dapper 是一個效率很是高的orm 框架 ,效率要遠遠大於 咱們大微軟的EF . 它只有一個類文件,很是之小。(在 EF 5.0 後 微軟已經作了 改進)app
ps; 因爲以前我也沒測試過,只是看過官方以前的數據,仍是實踐出真知 。 在這裏謝謝 深藍醫生 的指正。不過它仍是一個很是優秀的微型orm框架。框架
在Package Manager Console 中輸入ide
PM> Install-Package Dapper.Rainbow
準備工做 完成 下面是 demo 。測試
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data.SqlClient; using Dapper; // to have a play, install Dapper.Rainbow from nuget namespace TestDapper { class Program { // no decorations, base class, attributes, etc class Product { public int Id { get; set; } public string Name { get; set; } public string Description { get; set; } public DateTime? LastPurchase { get; set; } } // container with all the tables class MyDatabase : Database<MyDatabase> { public Table<Product> Products { get; set; } } static void Main(string[] args) { var cnn = new SqlConnection("Data Source=.;Initial Catalog=tempdb;Integrated Security=True"); cnn.Open(); var db = MyDatabase.Init(cnn, commandTimeout: 2); try { db.Execute("waitfor delay '00:00:03'"); } catch (Exception) { Console.WriteLine("yeah ... it timed out"); } db.Execute("if object_id('Products') is not null drop table Products"); db.Execute(@"create table Products ( Id int identity(1,1) primary key, Name varchar(20), Description varchar(max), LastPurchase datetime)"); int? productId = db.Products.Insert(new {Name="Hello", Description="Nothing" }); var product = db.Products.Get((int)productId); product.Description = "untracked change"; // snapshotter tracks which fields change on the object var s = Snapshotter.Start(product); product.LastPurchase = DateTime.UtcNow; product.Name += " World"; // run: update Products set LastPurchase = @utcNow, Name = @name where Id = @id // note, this does not touch untracked columns db.Products.Update(product.Id, s.Diff()); // reload product = db.Products.Get(product.Id); Console.WriteLine("id: {0} name: {1} desc: {2} last {3}", product.Id, product.Name, product.Description, product.LastPurchase); // id: 1 name: Hello World desc: Nothing last 12/01/2012 5:49:34 AM Console.WriteLine("deleted: {0}", db.Products.Delete(product.Id)); // deleted: True Console.ReadKey(); } } }
上面 這個MyDatabase ,實現了和 EF一樣的機制 ,有了這個至關於EF 上下文的東西,就方便不少了, 拿到這個上下文後,就能直接操做全部的表了 ,方便了統一管理 ,用着很爽呀。。 .this