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Enlisting in a Distributed Transaction
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In addition to starting new transactions and setting isolation levels of a transaction, you can configure your connection to enlist in an existing distributed transaction. A distributed transaction is a transaction that spans many resources, such as multiple SQL Server databases (as opposed to a local transaction that typically uses a single database). The following code shows how to enlist in a distributed transaction and assumes that the activeTransaction variable is set to an existing distributed transaction:
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' VB NorthwindConnection.EnlistTransaction(activeTransaction) // C# NorthwindConnection.EnlistTransaction(activeTransaction);
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Working with Data in a Connected Environment
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Lab: Performing Transactions
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In this lab you will practice working with the Transaction object using the Commit and Rollback methods.
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Exercise 1: Performing Transactions with the Transaction Object
To demonstrate using a transaction, the following example will attempt to execute two separate commands that will insert records into two different tables. In an effort to provide clarity to the example, the transaction will be committed or rolled back based on user input. In a real-world scenario, you would likely execute the Commit and Rollback methods based on error conditions or business logic in your application, but the process to accept or abort the transaction is exactly the same. 1. Create a new Windows application named PerformingTransactions. 2. Add a button to the form and set the following properties:
Name = PerformTransactionButton Text = Perform
Transaction
3. Double-click the Perform Transaction button. 4. Add references to the System.Data and System.Data.SqlClient namespaces. 5. Add code to create a Northwind connection on the form. 6. At this point, the form code should look similar to the following:
' VB Imports System.Data
Imports System.Data.SqlClient
Public Class Form1 Private NorthwindConnection As New SqlConnection _ ("Data Source=.\sqlexpress;Initial Catalog=Northwind;Integrated Security=True") Private Sub PerformTransactionButton_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles PerformTransactionButton.Click End Sub
End Class
// C# using using using using using using using
System;
System.Collections.Generic;
System.ComponentModel;
System.Data;
System.Drawing;
System.Text;
System.Windows.Forms;
Lesson 5: Performing Transactions by Using the Transaction Object
using System.Data.SqlClient; namespace PerormingTransactionsCS {
public partial class Form1 : Form
public Form1()
InitializeComponent();
private SqlConnection NorthwindConnection = new SqlConnection _
("Data Source=.\\sqlexpress;Initial Catalog=Northwind;Integrated
Security=True");
private void PerformTransactionButton_Click(object sender, EventArgs e) { }
7. Add the following code to the form to allow the application to work every time the button is clicked:
' VB Private Sub DeleteExtraRecords()
' If you have already ran the application
' delete the 2 records to prevent a primary
' key violation.
Dim Command1 As New SqlCommand("DELETE FROM Territories WHERE TerritoryID = 98012; " _ & "DELETE FROM Region WHERE RegionID = 10", NorthwindConnection) NorthwindConnection.Open() Command1.ExecuteNonQuery() NorthwindConnection.Close() End Sub // C# private void DeleteExtraRecords() { // If you have already ran the application // delete the 2 records to prevent a primary // key violation. SqlCommand Command1 = new SqlCommand("DELETE FROM Territories WHERE TerritoryID = 98012; " + "DELETE FROM Region WHERE RegionID = 10", NorthwindConnection); NorthwindConnection.Open(); Command1.ExecuteNonQuery(); NorthwindConnection.Close(); }
6
Working with Data in a Connected Environment
8. The following code creates the Transaction object and the commands and exe cutes them within the transaction. Add this code to the form:
' VB Private Sub PerformTransaction()
' Remove the records from this example
' so it works each time the button is clicked!
DeleteExtraRecords()
' Create the transaction
Dim transaction As SqlTransaction
' Create 2 commands to execute in the transaction Dim Command1 As New SqlCommand("INSERT INTO Region" & _ "(RegionID, RegionDescription)" & _ "VALUES (10,'Northwest')", NorthwindConnection) Dim Command2 As New SqlCommand("INSERT INTO Territories" & _ "(TerritoryID, TerritoryDescription, RegionID)" & _ "VALUES (98012, 'Bothell', 10)", NorthwindConnection) ' Open the connection and begin the transaction NorthwindConnection.Open() transaction = NorthwindConnection.BeginTransaction ' Set the commands to execute within the transaction Command1.Transaction = transaction Command2.Transaction = transaction ' Execute the commands
Command1.ExecuteNonQuery()
Command2.ExecuteNonQuery()
' After executing the commands display a dialog ' that allows the user to complete or abort the ' transaction. Dim response As DialogResult = MessageBox.Show("Commands have already been executed." _ Environment.NewLine & "Proceed with transaction ", _ "Performing Transaction", MessageBoxButtons.YesNo) ' Process the response and either
' Commit or Rollback.
Select Case response
Case Windows.Forms.DialogResult.Yes
transaction.Commit()
Case Windows.Forms.DialogResult.No
transaction.Rollback()
End Select
NorthwindConnection.Close()
End Sub
Lesson 5: Performing Transactions by Using the Transaction Object
// C# private void PerformTransaction() { // Remove the records from this example // so it works each time the button is clicked! DeleteExtraRecords(); // Create the transaction
SqlTransaction transaction;
// Create 2 commands to execute in the transaction SqlCommand Command1 = new SqlCommand("INSERT INTO Region" +
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