OleDbConnection.BeginTransaction Metode

Definisi

Ruang nama:

System.Data.OleDb

Rakitan:

System.Data.OleDb.dll

Paket:

System.Data.OleDb v8.0.0

Memulai transaksi database.

Overload

BeginTransaction()	Memulai transaksi database dengan nilai saat ini IsolationLevel .
BeginTransaction(IsolationLevel)	Memulai transaksi database dengan tingkat isolasi yang ditentukan.

BeginTransaction()

Sumber:

OleDbConnection.cs

Memulai transaksi database dengan nilai saat ini IsolationLevel .

public:
 System::Data::OleDb::OleDbTransaction ^ BeginTransaction();

public System.Data.OleDb.OleDbTransaction BeginTransaction ();

override this.BeginTransaction : unit -> System.Data.OleDb.OleDbTransaction

Public Function BeginTransaction () As OleDbTransaction

Mengembalikan

OleDbTransaction

Objek yang mewakili transaksi baru.

Pengecualian

InvalidOperationException

Transaksi paralel tidak didukung.

Contoh

Contoh berikut membuat OleDbConnection dan OleDbTransaction. Ini juga menunjukkan cara menggunakan BeginTransactionmetode , , Commitdan Rollback .

public void ExecuteTransaction(string connectionString)
{
    using (OleDbConnection connection =
               new OleDbConnection(connectionString))
    {
        OleDbCommand command = new OleDbCommand();
        OleDbTransaction transaction = null;

        // Set the Connection to the new OleDbConnection.
        command.Connection = connection;

        // Open the connection and execute the transaction.
        try
        {
            connection.Open();

            // Start a local transaction with ReadCommitted isolation level.
            transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted);

            // Assign transaction object for a pending local transaction.
            command.Connection = connection;
            command.Transaction = transaction;

            // Execute the commands.
            command.CommandText =
                "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')";
            command.ExecuteNonQuery();
            command.CommandText =
                "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')";
            command.ExecuteNonQuery();

            // Commit the transaction.
            transaction.Commit();
            Console.WriteLine("Both records are written to database.");
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
            try
            {
                // Attempt to roll back the transaction.
                transaction.Rollback();
            }
            catch
            {
                // Do nothing here; transaction is not active.
            }
        }
        // The connection is automatically closed when the
        // code exits the using block.
    }
}

Public Sub ExecuteTransaction(ByVal connectionString As String)

    Using connection As New OleDbConnection(connectionString)
        Dim command As New OleDbCommand()
        Dim transaction As OleDbTransaction

        ' Set the Connection to the new OleDbConnection.
        command.Connection = connection

        ' Open the connection and execute the transaction.
        Try
            connection.Open()

            ' Start a local transaction with ReadCommitted isolation level.
            transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

            ' Assign transaction object for a pending local transaction.
            command.Connection = connection
            command.Transaction = transaction

            ' Execute the commands.
            command.CommandText = _
                "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')"
            command.ExecuteNonQuery()
            command.CommandText = _
                "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')"
            command.ExecuteNonQuery()

            ' Commit the transaction.
            transaction.Commit()
            Console.WriteLine("Both records are written to database.")

        Catch ex As Exception
            Console.WriteLine(ex.Message)
            ' Try to rollback the transaction
            Try
                    transaction.Rollback()

            Catch
                ' Do nothing here; transaction is not active.
            End Try
        End Try
        ' The connection is automatically closed when the
        ' code exits the Using block.
    End Using
End Sub

Keterangan

Anda harus secara eksplisit menerapkan atau mengembalikan transaksi menggunakan Commit metode atau Rollback . Untuk memastikan bahwa Penyedia Data .NET Framework untuk model manajemen transaksi OLE DB berfungsi dengan benar, hindari menggunakan model manajemen transaksi lainnya, seperti yang disediakan oleh sumber data.

Lihat juga

• Menyambungkan ke Sumber Data

BeginTransaction(IsolationLevel)

Sumber:

OleDbConnection.cs

Memulai transaksi database dengan tingkat isolasi yang ditentukan.

public:
 System::Data::OleDb::OleDbTransaction ^ BeginTransaction(System::Data::IsolationLevel isolationLevel);

public System.Data.OleDb.OleDbTransaction BeginTransaction (System.Data.IsolationLevel isolationLevel);

override this.BeginTransaction : System.Data.IsolationLevel -> System.Data.OleDb.OleDbTransaction

Public Function BeginTransaction (isolationLevel As IsolationLevel) As OleDbTransaction

Parameter

isolationLevel

IsolationLevel

Tingkat isolasi tempat transaksi harus berjalan.

Mengembalikan

OleDbTransaction

Objek yang mewakili transaksi baru.

Pengecualian

InvalidOperationException

Transaksi paralel tidak didukung.

Contoh

Contoh berikut membuat OleDbConnection dan OleDbTransaction. Ini juga menunjukkan cara menggunakan BeginTransactionmetode , , Commitdan Rollback .

public void ExecuteTransaction(string connectionString)
{
    using (OleDbConnection connection =
               new OleDbConnection(connectionString))
    {
        OleDbCommand command = new OleDbCommand();
        OleDbTransaction transaction = null;

        // Set the Connection to the new OleDbConnection.
        command.Connection = connection;

        // Open the connection and execute the transaction.
        try
        {
            connection.Open();

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

            // Assign transaction object for a pending local transaction.
            command.Connection = connection;
            command.Transaction = transaction;

            // Execute the commands.
            command.CommandText =
                "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')";
            command.ExecuteNonQuery();
            command.CommandText =
                "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')";
            command.ExecuteNonQuery();

            // Commit the transaction.
            transaction.Commit();
            Console.WriteLine("Both records are written to database.");
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
            try
            {
                // Attempt to roll back the transaction.
                transaction.Rollback();
            }
            catch
            {
                // Do nothing here; transaction is not active.
            }
        }
        // The connection is automatically closed when the
        // code exits the using block.
    }
}

Public Sub ExecuteTransaction(ByVal connectionString As String)

    Using connection As New OleDbConnection(connectionString)
        Dim command As New OleDbCommand()
        Dim transaction As OleDbTransaction

        ' Set the Connection to the new OleDbConnection.
        command.Connection = connection

        ' Open the connection and execute the transaction.
        Try
            connection.Open()

            ' Start a local transaction.
            transaction = connection.BeginTransaction()

            ' Assign transaction object for a pending local transaction.
            command.Connection = connection
            command.Transaction = transaction

            ' Execute the commands.
            command.CommandText = _
                "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')"
            command.ExecuteNonQuery()
            command.CommandText = _
                "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')"
            command.ExecuteNonQuery()

            ' Commit the transaction.
            transaction.Commit()
            Console.WriteLine("Both records are written to database.")

        Catch ex As Exception
            Console.WriteLine(ex.Message)
            ' Try to rollback the transaction
            Try
                    transaction.Rollback()

            Catch
                ' Do nothing here; transaction is not active.
            End Try
        End Try
        ' The connection is automatically closed when the
        ' code exits the Using block.
    End Using
End Sub

Keterangan

Anda harus secara eksplisit menerapkan atau mengembalikan transaksi menggunakan Commit metode atau Rollback . Untuk memastikan bahwa Penyedia Data .NET Framework untuk model manajemen transaksi OLE DB berfungsi dengan benar, hindari menggunakan model manajemen transaksi lainnya, seperti yang disediakan oleh sumber data.

Catatan

Jika Anda tidak menentukan tingkat isolasi, tingkat isolasi default untuk penyedia yang mendasar akan digunakan. Untuk menentukan tingkat isolasi dengan BeginTransaction metode , gunakan kelebihan beban yang mengambil isolationLevel parameter .

Lihat juga

• Menyambungkan ke Sumber Data