dapper 扩展插件: Rainbow

 

dapper 扩展插件: Rainbow

  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。 

   1,首先下载dapper  这里下载   .

   2,下载插件  Rainbow

    在Package Manager Console  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<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 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。。  .

 

  

 

 

分类:  ORM

标签:  micro-orm,  dapper