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OleDbCommand类

 

首先,建立一个OleDbCmdTest.aspx
代码如下:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="OleDbCmdTest.aspx.cs" Inherits="OleDbCmdTest" %>

<!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>演示OleDbCommand类</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>

在OleDbCmdTest.aspx.cs中写入如下代码:

protected void Page_Load(object sender, EventArgs e)
    {
        //连接字符串
        String sqlconn = " Provider=Microsoft.Jet.OLEDB.4.0;Data Source=E:\\工作\\asp.net\\ASP.NET 4.0基础教程\\源代码\\chap08\\chap08\\App_Data\\Northwind.mdb;Jet OLEDB:Database Password=111111";
        OleDbConnection myConnection = new OleDbConnection(sqlconn);
        //打开数据库连接
        myConnection.Open();
        OleDbCommand myCommand = new OleDbCommand("select * from 运货商", myConnection);
        OleDbDataReader myReader;
        myReader = myCommand.ExecuteReader();
        //获取数据之前,必须不断的调用Read方法,它负责前进到下一条记录.
        Response.Write("<h3>使用OleDbCommand类读取数据</h3><hr>");
        Response.Write("<table border=1 cellspacing=0 cellpadding=2>");
        //显示列名字
        Response.Write("<tr bgcolor=#DAB4B4>");
        for (int i = 0; i < myReader.FieldCount; i++)
        {
            Response.Write("<td>" + myReader.GetName(i) + "</td>");
        }
        Response.Write("</tr>");
        //输出所有的字段值
        while (myReader.Read())
        {
            Response.Write("<tr>");
            //打印取到的数据
            for (int i = 0; i < myReader.FieldCount; i++)
            {
                Response.Write("<td>" + myReader[i].ToString() + "</td>");
            }
            Response.Write("</tr>");
        }
        Response.Write("</table>");
        //关闭SqlDataReader
        myReader.Close();
        //关闭与数据库的连接
        myConnection.Close();
    }    

在写入代码之前,需要引入一些包:

using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;

运行结果如下:
在这里插入图片描述
其中重点有:
1:

OleDbConnection myConnection = new OleDbConnection(sqlconn);
            //打开数据库连接
myConnection.Open();
OleDbCommand myCommand = new OleDbCommand("select * from 运货商",         myConnection);
OleDbDataReader myReader;
myReader = myCommand.ExecuteReader();   

2:

 for (int i = 0; i < myReader.FieldCount; i++)
 {
       Response.Write("<td>" + myReader.GetName(i) + "</td>");
}
Response.Write("</tr>");

3:

while (myReader.Read())
{
      Response.Write("<tr>");
     //打印取到的数据
     for (int i = 0; i < myReader.FieldCount; i++)
    {
         Response.Write("<td>" + myReader[i].ToString() + "</td>");
     }
    Response.Write("</tr>");
 }
Response.Write("</table>");

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原文链接:OleDbCommand类,转载请注明来源!

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