myupdatesql.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.SqlClient;
using System.Configuration;

namespace Example_7_3
{
	/// <summary>
	/// Summary description for WebForm1.
	/// </summary>
	public class MyUpdateSQL : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Label StaffLabel;
		protected System.Web.UI.WebControls.TextBox StaffName;
		protected System.Web.UI.WebControls.Button UpdateStaffBtn;
		protected System.Web.UI.WebControls.Label UpdateStaffLabel;
		private readonly string SQLCONNECTIONSTRING = ConfigurationSettings.AppSettings["SQLCONNECTIONSTRING"].ToString();

		private void Page_Load(object sender, System.EventArgs e)
		{
			if(!Page.IsPostBack)
			{   ///获取执行更新操作之前的数据
				FormatLabel(GetStaffs(),StaffLabel);				
			}
		}

		private SqlDataReader GetStaffs()
		{
			///从数据库中获取表记录的条数
			String cmdText = "SELECT TOP 5 Staff_Name  FROM Staff ORDER BY Staff_ID DESC";
			SqlConnection myConnection = new SqlConnection(SQLCONNECTIONSTRING);
			SqlCommand myCommand = new SqlCommand(cmdText,myConnection);

			///执行数据库查询
			myConnection.Open();
			SqlDataReader dr = myCommand.ExecuteReader(CommandBehavior.CloseConnection);
	
			///返回一个对象
			return(dr);
		}

		private void FormatLabel(SqlDataReader dr,Label label)
		{
			while(dr.Read())
			{
				label.Text += dr["Staff_Name"].ToString() + "<br>";
			}
			dr.Close();
		}

		private void UpdateStaff(String sStaffName)
		{
			///从数据库中获取表记录
			String cmdText = "UPDATE Staff SET Staff_Name = '" + sStaffName + "' WHERE Staff_Name like '%StaffName%'";
			SqlConnection myConnection = new SqlConnection(SQLCONNECTIONSTRING);
			SqlCommand myCommand = new SqlCommand(cmdText,myConnection);

			///执行数据库查询
			myConnection.Open();
			myCommand.ExecuteNonQuery();
			myConnection.Close();
		}

		private void UpdateStaffBtn_Click(object sender, System.EventArgs e)
		{
			///执行更新操作
			UpdateStaff(StaffName.Text.Trim());

			///获取执行更新操作之前的数据
			FormatLabel(GetStaffs(),UpdateStaffLabel);
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.UpdateStaffBtn.Click += new System.EventHandler(this.UpdateStaffBtn_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion	
	}
}