updatedata.aspx.cs

ASP C#代码实例 适合初学人士学习使用

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;
using System.Configuration;

namespace Example_1_1
{
	/// <summary>
	/// UpdateData 的摘要说明。
	/// </summary>
	public class UpdateData : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Button UpdateDataBtn;
		protected System.Web.UI.WebControls.TextBox MyID;
		protected System.Web.UI.WebControls.TextBox MyName;
		private readonly string ACCESSCONNECTIONSTRING = ConfigurationSettings.AppSettings["ACCESSCONNECTIONSTRING"].ToString();

		private void Page_Load(object sender, System.EventArgs e)
		{
			if(!Page.IsPostBack)
			{
				///显示数据库MyFirstAccessDB中的数据
				ShowDBData();
			}
		}

		private void ShowDBData()
		{
			string accessString = ACCESSCONNECTIONSTRING + Server.MapPath("MyFirstAccessDB.mdb");
			string cmdText = "SELECT * FROM MyDataTable";
			OleDbConnection accessConn = new OleDbConnection(accessString);
			OleDbCommand accessComm = new OleDbCommand(cmdText,accessConn);

			string dataString = "<br>MyID  MyName  MyType  My Length<br>";

			try
			{
				///打开OLEDB数据库的链接
				accessConn.Open();
				Response.Write("连接MyFirstAccessDB数据源成功！！！");

				//显示数据库中的信息
				OleDbDataReader reca = accessComm.ExecuteReader();

				while(reca.Read())
				{
					dataString += reca["MyID"].ToString() +" " + reca["MyName"].ToString()
						+" " + reca["MyType"].ToString() +" " + reca["MyLength"].ToString();
					dataString += "<br>";
				}
				reca.Close();
			
				///显示数据库中的内容
				Response.Write(dataString);				

				///关闭OLEDB数据库的链接
				accessConn.Close();				
			}
			catch(Exception ex)
			{
				//抛出数据库连接异常
				Response.Write(ex.Message);
			}	
		}

		private void UpdataDBData(String myID,String myName)
		{			
			string accessString = ACCESSCONNECTIONSTRING + Server.MapPath("MyFirstAccessDB.mdb");
			string cmdText = "UPDATE MyDataTable SET MyName='" + myName + "' WHERE MyID=" + myID;
			OleDbConnection accessConn = new OleDbConnection(accessString);
			OleDbCommand accessComm = new OleDbCommand(cmdText,accessConn);

			try
			{
				///打开OLEDB数据库的链接
				accessConn.Open();

				///执行更新数据操作
				accessComm.ExecuteNonQuery();

				///关闭OLEDB数据库的链接
				accessConn.Close();				
			}
			catch(Exception ex)
			{
				//抛出数据库连接异常
				Response.Write(ex.Message);
			}

		}

		#region Web 窗体设计器生成的代码
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{    
			this.UpdateDataBtn.Click += new System.EventHandler(this.UpdateDataBtn_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void UpdateDataBtn_Click(object sender, System.EventArgs e)
		{
			if(MyID.Text.Trim().Length > 0 && MyName.Text.Trim().Length > 0)
			{
				UpdataDBData(MyID.Text.Trim(),MyName.Text.Trim());
				ShowDBData();
			}
		}
	}
}