mytransaction.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.Configuration;
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;

namespace Example_5_3
{
	/// <summary>
	/// Summary description for WebForm1.
	/// </summary>
	public class MyTransaction : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Label ReaderLabel;
		protected System.Web.UI.WebControls.Label TransacteLabel;
		private readonly string SQLCONNECTIONSTRING = ConfigurationSettings.AppSettings["SQLCONNECTIONSTRING"].ToString();

		private void Page_Load(object sender, System.EventArgs e)
		{
			if(!Page.IsPostBack)
			{
				///显示修改前的记录值
				ReaderLabel.Text = FormatDataReader(ExecuteReader());

				///执行ADO.NET中的事务操作
				ExecuteTransaction("MyName","SheName");

				///显示修改后的记录值
				TransacteLabel.Text = FormatDataReader(ExecuteReader());
			}
		}

		#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.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void ExecuteTransaction(String newName,String newOtherName)
		{
			///定义执行数据库的SQL
			String cmdText = "UPDATE Staff SET Staff_Name='" + newName + "' WHERE Staff_ID=8";
			SqlConnection myConnection = new SqlConnection(SQLCONNECTIONSTRING);			
			SqlCommand myCommand = new SqlCommand(cmdText,myConnection);
			
			///打开数据库链接，并定义操作的事务
			myConnection.Open();
			SqlTransaction myTransaction = myConnection.BeginTransaction();			
			
			///事务的开始
			myCommand.Transaction = myTransaction;
			try
			{
				///执行数据库操作，并使用使用事务
				myCommand.ExecuteNonQuery();
				myCommand.CommandText = "UPDATE Staff SET Staff_Name='" + newOtherName + "' WHERE Staff_ID=11";
				myCommand.ExecuteNonQuery();
				
				///提交事务
				myTransaction.Commit();
				Response.Write("修改表Staff中的两条记录成功");
			}
			catch
			{
				///回滚事务
				myTransaction.Rollback();
				Response.Write("修改表Staff中的两条记录失败");
			}
			finally
			{
				///关闭数据库链接
				myConnection.Close();
			}
		}

		private SqlDataReader ExecuteReader()
		{
			String cmdText = "SELECT Staff_Name,RealName from Staff WHERE Staff_ID < 12 AND Staff_ID > 7";
			SqlConnection myConnection = new SqlConnection(SQLCONNECTIONSTRING);
			SqlCommand myCommand = new SqlCommand(cmdText,myConnection);

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

		/// <summary>
		/// 格式化SqlDataReader对象中的数据
		/// </summary>
		private String FormatDataReader(SqlDataReader datareader)
		{
			///读取数据
			String readerString = "";
			while(datareader.Read())
			{
				readerString += "Staff_Name=" + datareader["Staff_Name"].ToString() + "　";
				readerString += "RealName=" + datareader["RealName"].ToString();
				readerString += "<br>";
			}
			///关闭读取器
			datareader.Close();

			return(readerString);
		}
	}
}