ASP.NET数据访问 － 四大对象

今天总结下ASP.NET中的基本数据访问。
写过ASP数据库编程的朋友应该知道，在ASP中访问数据库主要用到三大对象：
Connection, Command, RecordSet

新一代的ADO.NET对老的ADO进行了升级，主要有四大对象：
1）SqlConnection
2）SqlCommand
3）SqlDataAdapter
4）DataSet

其中，SqlDataAdapter是新增加的 适配器对象。
它用来 填充结果集。

1）建立并打开连接
2）根据连接和sql语句创建适配器
3）用适配器填充结果集
4）数据绑定－将结果 集绑定到控件

以北风数据库为例，具体来举个例子：
 ASPX代码：

<% @ Page Language = " C# "  AutoEventWireup = " true "  CodeBehind = " dataAccess1.aspx.cs "  Inherits = " BlogNet.ASPXDemo.dataAccess1 "   %>

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >

< html  xmlns ="http://www.w3.org/1999/xhtml"   >
< head  runat ="server" >
     < title > ASP.NET数据访问－四大对象 </ title >
</ head >
< body >
     < form  id ="form1"  runat ="server" >
     < div >
    
     < asp:GridView  ID ="GridView1"  
        runat ="server"  
        AutoGenerateColumns ="False"
        AllowPaging ="True"  
        AllowSorting ="True"  
        PageSize ="20"  
        OnPageIndexChanging ="GridView1_PageIndexChanging" >
         < Columns >
             < asp:BoundField  DataField ="CustomerID"  HeaderText ="CustomerID"  ReadOnly ="True"  
                SortExpression ="CustomerID"  NullDisplayText ="N/A"   />
             < asp:BoundField  DataField ="CompanyName"  HeaderText ="CompanyName"  
                SortExpression ="CompanyName"  NullDisplayText ="N/A"   />
             < asp:BoundField  DataField ="ContactName"  HeaderText ="ContactName"  
                SortExpression ="ContactName"  NullDisplayText ="N/A"   />
             < asp:BoundField  DataField ="ContactTitle"  HeaderText ="ContactTitle"  
                SortExpression ="ContactTitle"  NullDisplayText ="N/A"   />
             < asp:BoundField  DataField ="Address"  HeaderText ="Address"  
                SortExpression ="Address"  NullDisplayText ="N/A"   />
             < asp:BoundField  DataField ="City"  HeaderText ="City"  SortExpression ="City"  NullDisplayText ="N/A"   />
             < asp:BoundField  DataField ="Region"  HeaderText ="Region"  
                SortExpression ="Region"  NullDisplayText ="N/A"   />
             < asp:BoundField  DataField ="PostalCode"  HeaderText ="PostalCode"  
                SortExpression ="PostalCode"  NullDisplayText ="N/A"   />
             < asp:BoundField  DataField ="Country"  HeaderText ="Country"  
                SortExpression ="Country"  NullDisplayText ="N/A"   />
             < asp:BoundField  DataField ="Phone"  HeaderText ="Phone"  SortExpression ="Phone"  NullDisplayText ="N/A"   />
             < asp:BoundField  DataField ="Fax"  HeaderText ="Fax"  SortExpression ="Fax"  NullDisplayText ="N/A"   />
         </ Columns >
     </ asp:GridView >
        
     </ div >
     </ form >
</ body >
</ html >

cs代码：

using  System;
using  System.Collections;
using  System.Configuration;
using  System.Data;
using  System.Linq;
using  System.Web;
using  System.Web.Security;
using  System.Web.UI;
using  System.Web.UI.HtmlControls;
using  System.Web.UI.WebControls;
using  System.Web.UI.WebControls.WebParts;
using  System.Xml.Linq;

using  System.Data.SqlClient;

namespace  BlogNet.ASPXDemo
{
     public   partial   class  dataAccess1 : System.Web.UI.Page
    {
         protected   void  Page_Load( object  sender, EventArgs e)
        {
             string  strConn  =   " Data Source=localhost;Initial Catalog=Northwind;Integrated Security=True " ;
            SqlConnection conn  =   new  SqlConnection(strConn);
            conn.Open();

             string  sql  =   " select * from Customers " ;
            SqlDataAdapter da  =   new  SqlDataAdapter(sql, conn);
            DataSet ds  =   new  DataSet();
            da.Fill(ds);

            GridView1.DataSource  =  ds;
            GridView1.DataBind();

            conn.Close();
        }

         protected   void  GridView1_PageIndexChanging( object  sender, GridViewPageEventArgs e)
        {
            GridView1.PageIndex  =  e.NewPageIndex;
            GridView1.DataBind();
        }
    }
}

转载于:https://www.cnblogs.com/davidgu/archive/2009/07/31/1535935.html