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

1	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