SQLDataReader Vs. DataSet（好多人弄不清楚，这回大家可以看看了）

SQLDataReader vs DataSet

Submitted By	User Level	Date of Submission
Arnold Park	Intermediate	05/11/2001

  
Objective:
To compare and contrast SQLDataReader and SQLDataSetCommand

Target Audience
ADO.NET programmer

Environment
SQL2000, Visual studio .NET Beta 1
ibuyspy DataBase

Structure Of Table
CREATE TABLE [dbo].[OrderDetails] (
[OrderID] [int] NOT NULL ,
[ProductID] [int] NOT NULL ,
[Quantity] [int] NOT NULL ,
[UnitCost] [money] NOT NULL
) ON [PRIMARY]
GO

CREATE TABLE [dbo].[Products] (
[ProductID] [int] IDENTITY (1, 1) NOT NULL ,
[CategoryID] [int] NOT NULL ,
[ModelNumber] [nvarchar] (50) COLLATE Korean_Wansung_CI_AS NULL ,
[ModelName] [nvarchar] (50) COLLATE Korean_Wansung_CI_AS NULL ,
[ProductImage] [nvarchar] (50) COLLATE Korean_Wansung_CI_AS NULL ,
[UnitCost] [money] NOT NULL ,
[Description] [nvarchar] (3800) COLLATE Korean_Wansung_CI_AS NULL
) ON [PRIMARY]

Stored Procedure
/* procedure name:NET_PopularProduct_SelectMaster
* objective           :Weekly Best Items top 5
*/

CREATE PROCEDURE NET_PopularProduct_SelectMaster
as
BEGIN
select top 5 o.productid,sum(o.quantity) as total,p.modelname
from orderdetails o,products p
where o.productid=p.productid
group by o.productid,p.modelname
order by total desc
END

*****************Source Code

1)Using SQLDataSetCommand

Conn=new Common.DBConn(); SQLDataSetCommand Comm=new SQLDataSetCommand("NET_PopularProduct_SelectMaster",Conn); Comm.SelectCommand.CommandType=CommandType.StoredProcedure; DataSet ds=new DataSet(); Comm.FillDataSet(ds,"PopItems"); return ds;

2)Using SQLDataReader

Conn=new Common.DBConn(); SQLCommand Comm=new SQLCommand("NET_PopularProduct_SelectMaster",Conn); Comm.CommandType=CommandType.StoredProcedure; Conn.Open(); Comm.Execute(out reader); DataTable table=new DataTable("Top5"); table.Columns.Add(new DataColumn("Product_ID",typeof(System.Int32))); table.Columns.Add(new DataColumn("Quantity",typeof(System.Int32))); table.Columns.Add(new DataColumn("Product_Name",typeof(System.String))); while(reader.Read()) { datarow=table.NewRow(); datarow[0]=reader.GetInt32(0); datarow[1]=reader.GetInt32(1); datarow[2]=reader.GetString(2); table.Rows.Add(datarow); } Conn.Close(); return table;

原文转自：http://www.ltesting.net