Материал из .Net Framework эксперт
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Local Transactions
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="LocalTransactions" %>
<!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 id="Head1" runat="server">
<title>Local Transactions</title>
</head>
<body>
<form id="form1" runat="server">
<div id="container">
<h1>Local Transactions</h1>
This example illustrates how to use local transactions with ADO.NET.
<asp:Label ID="labMsg" runat="server" />
</div>
</form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class LocalTransactions : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
ModifyData();
}
private void ModifyData()
{
string connString = ConfigurationManager.ConnectionStrings["Book"].ConnectionString;
int pubIdToDelete = 9;
SqlConnection conn = new SqlConnection(connString);
SqlTransaction trans = null;
try
{
conn.Open();
trans = conn.BeginTransaction();
string sqlA = "DELETE FROM Publishers ";
sqlA += " WHERE PublisherId=@pubid";
SqlCommand cmdA = new SqlCommand(sqlA, conn, trans);
cmdA.Parameters.AddWithValue("@pubId", pubIdToDelete);
cmdA.ExecuteNonQuery();
string sqlB = "DELETE FROM NonExistantTable ";
sqlB += " WHERE PublisherId=@pubid";
SqlCommand cmdB = new SqlCommand(sqlB, conn, trans);
cmdB.Parameters.AddWithValue("@pubId", pubIdToDelete);
cmdB.ExecuteNonQuery();
trans.rumit();
labMsg.Text = "Database updated successfully";
}
catch (Exception ex)
{
labMsg.Text = "[btnUpdate_Click] ";
labMsg.Text += "Error occurred accessing the database";
labMsg.Text += "<br/>" + ex.Message;
if (trans != null)
{
trans.Rollback();
labMsg.Text += "<br/>" + "Changes rolled back";
}
}
finally
{
conn.Close();
conn = null;
}
}
}
