IDbTransaction 介面

定義

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 Framework 資料提供者所實作。Represents a transaction to be performed at a data source, and is implemented by .NET Framework data providers that access relational databases.

public interface class IDbTransaction : IDisposable
public interface IDbTransaction : IDisposable
type IDbTransaction = interface
    interface IDisposable
Public Interface IDbTransaction
Implements IDisposable
衍生
實作

範例

下列範例會建立衍生類別的實例, SqlConnection以及。 SqlTransactionThe following example creates instances of the derived classes, SqlConnection and SqlTransaction. 它也會示範如何使用BeginTransactionCommitRollback方法。It also demonstrates how to use the BeginTransaction, Commit, and Rollback methods.

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);
            }
        }
    }
}
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("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 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

IDbTransaction介面允許繼承類別執行交易類別, 這代表要在資料來源執行的交易。The IDbTransaction interface allows an inheriting class to implement a Transaction class, which represents the transaction to be performed at a data source. 如需交易類別的詳細資訊, 請參閱交易和並行For more information about Transaction classes, see Transactions and Concurrency.

應用程式不會直接建立IDbTransaction介面的實例, 而是會建立繼承IDbTransaction之類別的實例。An application does not create an instance of the IDbTransaction interface directly, but creates an instance of a class that inherits IDbTransaction.

繼承IDbTransaction的類別必須執行繼承的成員, 而且通常會定義其他成員來新增提供者特有的功能。Classes that inherit IDbTransaction must implement the inherited members, and typically define additional members to add provider-specific functionality. 例如, IDbTransaction介面會Commit定義方法。For example, the IDbTransaction interface defines the Commit method. 接著, OleDbTransaction類別會繼承這個屬性, 也會Begin定義方法。In turn, the OleDbTransaction class inherits this property, and also defines the Begin method.

給實施者的注意事項

若要提升 .NET Framework 資料提供者之間的一致性, 請在表單Prv交易中Prv命名繼承類別, 其中是指定給特定 .NET Framework Data Provider 命名空間中所有類別的統一前置詞。To promote consistency among .NET Framework data providers, name the inheriting class in the form Prv Transaction where Prv is the uniform prefix given to all classes in a specific .NET Framework data provider namespace. 例如, SqlSystem.Data.SqlClient命名空間中SqlTransaction類別的前置詞。For example, Sql is the prefix of the SqlTransaction class in the System.Data.SqlClient namespace.

屬性

Connection

指定要與交易產生關聯的連接物件。Specifies the Connection object to associate with the transaction.

IsolationLevel

指定適用於此交易的 IsolationLevelSpecifies the IsolationLevel for this transaction.

方法

Commit()

認可資料庫交易。Commits the database transaction.

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。Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.

(繼承來源 IDisposable)
Rollback()

從暫止狀態復原交易。Rolls back a transaction from a pending state.

適用於