SqlTransaction Class

Definition

Represents a Transact-SQL transaction to be made in a SQL Server database. This class cannot be inherited.

public sealed class SqlTransaction : System.Data.Common.DbTransaction
type SqlTransaction = class
    inherit DbTransaction
Public NotInheritable Class SqlTransaction
Inherits DbTransaction
Inheritance
SqlTransaction

Examples

The following example creates a SqlConnection and a SqlTransaction. It also demonstrates how to use the BeginTransaction, Commit, and Rollback methods. The transaction is rolled back on any error, or if it is disposed without first being committed. Try/Catch error handling is used to handle any errors when attempting to commit or roll back the transaction.

using Microsoft.Data.SqlClient;

namespace Transaction1CS
{
    class Program
    {
        static void Main()
        {
            string connectionString =
                "Persist Security Info=False;Integrated Security=SSPI;database=Northwind;server=(local)";
            ExecuteSqlTransaction(connectionString);
            Console.ReadLine();
        }
        private static void ExecuteSqlTransaction(string connectionString)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                connection.Open();

                SqlCommand command = connection.CreateCommand();
                SqlTransaction transaction;

                // Start a local transaction.
                transaction = connection.BeginTransaction();

                // Must assign both transaction object and connection
                // to Command object for a pending local transaction
                command.Connection = connection;
                command.Transaction = transaction;

                try
                {
                    command.CommandText =
                        "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')";
                    command.ExecuteNonQuery();
                    command.CommandText =
                        "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')";
                    command.ExecuteNonQuery();

                    // Attempt to commit the transaction.
                    transaction.Commit();
                    Console.WriteLine("Both records are written to database.");
                }
                catch (Exception ex)
                {
                    Console.WriteLine("Commit Exception Type: {0}", ex.GetType());
                    Console.WriteLine("  Message: {0}", ex.Message);

                    // Attempt to roll back the transaction.
                    try
                    {
                        transaction.Rollback();
                    }
                    catch (Exception ex2)
                    {
                        // This catch block will handle any errors that may have occurred
                        // on the server that would cause the rollback to fail, such as
                        // a closed connection.
                        Console.WriteLine("Rollback Exception Type: {0}", ex2.GetType());
                        Console.WriteLine("  Message: {0}", ex2.Message);
                    }
                }
            }
        }
    }
}

Remarks

The application creates a SqlTransaction object by calling BeginTransaction on the SqlConnection object. All subsequent operations associated with the transaction (for example, committing or aborting the transaction), are performed on the SqlTransaction object.

Note

Try/Catch exception handling should always be used when committing or rolling back a SqlTransaction. Both Commit and Rollback generate an InvalidOperationException if the connection is terminated or if the transaction has already been rolled back on the server.

For more information on SQL Server transactions, see Explicit Transactions and Coding Efficient Transactions.

Properties

Connection

Gets the SqlConnection object associated with the transaction, or null if the transaction is no longer valid.

IsolationLevel

Specifies the IsolationLevel for this transaction.

Methods

Commit()

Commits the database transaction.

Rollback()

Rolls back a transaction from a pending state.

Rollback(String)

Rolls back a transaction from a pending state, and specifies the transaction or savepoint name.

Save(String)

Creates a savepoint in the transaction that can be used to roll back a part of the transaction, and specifies the savepoint name.

Applies to