輕量級ORM框架 第一篇：Dapper

爲什麼選擇Dapper，性能優越，各大網站的對比圖，在超過500次poco serialization的過程中所表現的性能，Dapper是第二名

 

支持多數據庫的本質是因爲Dapper是對IDBConnection接口進行了方法擴展，比如你看到的SqlMapper.cs，一旦你這樣做了，我們也知道，

SqlConnection,MysqlConnection,OracleConnection都是繼承於DBConnection，而DBConnection又是實現了IDBConnection的接口

1.安裝 Dapper

（1）打開NuGet添加引用Dapper，並安裝

（2）.如果不知道NuGet，就找到這個地址，cop下來複制到 程序包管理控制檯

 

創建 table

CREATE TABLE [dbo].[Users](
    [UserID] [int] IDENTITY(1,1) NOT NULL,
    [UserName] [varchar](50) NULL,
    [Email] [varchar](100) NULL,
    [Address] [varchar](100) NULL,
 CONSTRAINT [PK_Users] PRIMARY KEY CLUSTERED 
(
    [UserID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

2.單條insert

IDbConnection connection = new SqlConnection("Data Source=.;Initial Catalog=DapperTest;Integrated Security=True;MultipleActiveResultSets=True");
             var result = connection.Execute("Insert into Users values(@UserName,@Email,@Address)", new { UserName="jack",Email="[email protected]",Address="北京"});

3.批量

var userlist = Enumerable.Range(0, 10).Select(i => new Users()
            {
                Email = i + "QQ",
                UserName = i + "jack",
                Address = "asdf" + i
            });
      var result2 = connection.Execute("Insert into Users values(@UserName,@Email,@Address)", userlist);

4.查詢

 IDbConnection connection = new SqlConnection("Data Source=.;Initial Catalog=DapperTest;Integrated Security=True;MultipleActiveResultSets=True");
var query = connection.Query<Users>("select * from Users where UserName=@UserName",new { UserName="jack"});

5.刪除

  IDbConnection connection = new SqlConnection("Data Source=.;Initial Catalog=DapperTest;Integrated Security=True;MultipleActiveResultSets=True");
  var delete = connection.Execute("delete Users where  UserID=@UserId ", new { UserID = 11 });

6.修改

 IDbConnection connection = new SqlConnection("Data Source=.;Initial Catalog=DapperTest;Integrated Security=True;MultipleActiveResultSets=True");
 var updatelist = connection.Execute("update Users set Email=@Email  where UserID=@UserID", new { Email= "assadasdasd163.com",@UserId=6});