SqlTransaction的解析

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SqlTransaction类表示要在SQL Server数据库中处理的Transact-SQL事务。无法继承此类

应用程序通过在SqlConnection 对象上调用BeginTransaction 来创建 SqlTransaction 对象。对 SqlTransaction 对象执行与该事务关联的所有后续操作（例如提交或中止该事务）。

注意：在提交或回滚 SqlTransaction 时，应始终使用 Try/Catch 进行异常处理。如果连接终止或事务已在服务器上回滚，则Commit  和Rollback 都会生成

InvalidOperationException

示例：

下面的示例创建一个 SqlConnection 和一个 SqlTransaction。此示例演示如何使用 BeginTransaction、Commit 和 Rollback 等方法。出现任何错误时事务都会回滚。Try/Catch 错误处理用于处理尝试提交或回滚事务时的所有错误。

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(“SampleTransaction”);

        // 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);

            }

        }

    }

}