• 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();
            }
        }
    }




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  • 原文地址:https://www.cnblogs.com/davidgu/p/1535935.html
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