dapper 是一个效率非常高的orm 框架 ,效率要远远大于 我们大微软的EF . 它只有一个类文件,非常之小。(在 EF 5.0 后 微软已经做了 改进)
ps; 由于之前我也没测试过,只是看过官方之前的数据,还是实践出真知 。 在这里谢谢 的指正。不过它还是一个非常优秀的微型orm框架。
1,首先下载dapper .
2,下载插件
在 中输入
PM> Install-Package Dapper.Rainbow
准备工作 完成 下面是 demo 。
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{ public Table 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 这个MyDatabase ,实现了和 EF同样的机制 ,有了这个相当于EF 上下文的东西,就方便很多了, 拿到这个上下文后,就能直接操作所有的表了 ,方便了统一管理 ,用着很爽呀。。 .