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

來源:互聯網
上載者:User
SQLDataReader vs DataSet Submitted By User Level Date of SubmissionArnold ParkIntermediate05/11/2001  
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 SQLDataSetCommandConn=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 SQLDataReaderConn=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;

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