ASP.NET Tutorial/ADO.net Database/SqlTransaction
Local Transactions
<source lang="csharp">
<%@ 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">
Local Transactions
This example illustrates how to use local transactions with ADO.NET.
<asp:Label ID="labMsg" runat="server" />
</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 += "
" + ex.Message;
if (trans != null)
{
trans.Rollback();
labMsg.Text += "
" + "Changes rolled back";
}
}
finally
{
conn.Close();
conn = null;
}
}
}</source>
