IDbTransaction 介面

定義

命名空間:

System.Data

組件:

System.Data.Common.dll

代表要在資料來源上執行的交易，而且是由存取關聯式資料庫的 .NET 資料提供者所實作。

public interface class IDbTransaction : IDisposable

public interface IDbTransaction : IDisposable

type IDbTransaction = interface
    interface IDisposable

Public Interface IDbTransaction
Implements IDisposable

衍生

System.Data.Common.DbTransaction

實作

IDisposable

範例

下列範例會建立衍生類別 SqlConnection 和 SqlTransaction的實例。 它也示範如何使用 BeginTransaction、 Commit和 Rollback 方法。

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);
            }
        }
    }
}

Private Sub ExecuteSqlTransaction(ByVal connectionString As String)
    Using connection As New SqlConnection(connectionString)
        connection.Open()

        Dim command As SqlCommand = connection.CreateCommand()
        Dim transaction As SqlTransaction

        ' 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 ex As Exception
            Console.WriteLine("Commit Exception Type: {0}", ex.GetType())
            Console.WriteLine("  Message: {0}", ex.Message)

            ' Attempt to roll back the transaction.
            Try
                transaction.Rollback()

            Catch ex2 As Exception
                ' 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)
            End Try
        End Try
    End Using
End Sub

備註

介面 IDbTransaction 可讓繼承類別實作 Transaction 類別，這代表在數據源上執行的交易。 如需交易類別的詳細資訊，請參閱 交易和並行。

應用程式不會直接建立 介面的 IDbTransaction 實例，但會建立繼承 IDbTransaction之類別的實例。

繼承 IDbTransaction 的類別必須實作繼承的成員，而且通常會定義其他成員以新增提供者特定的功能。 例如， IDbTransaction 介面會 Commit 定義 方法。 接著，類別 OleDbTransaction 會繼承這個屬性，也會定義 Begin 方法。

給實施者的注意事項

若要在 .NET Framework 數據提供者之間提升一致性，請在 Transaction 格式Prv中命名繼承類別，其中 Prv 是指定給特定 .NET Framework 數據提供者命名空間中所有類別的統一前置詞。 例如，Sql是命名空間中 System.Data.SqlClient 類別的SqlTransaction前置詞。

屬性

Connection	指定要與交易產生關聯的連接物件。
IsolationLevel	指定適用於此交易的 IsolationLevel。

方法

Commit()	認可資料庫交易。
Dispose()	執行與釋放 (Free)、釋放 (Release) 或重設 Unmanaged 資源相關聯之應用程式定義的工作。 (繼承來源 IDisposable)
Rollback()	從暫止狀態復原交易。