Note: This namespace, class, or member is supported only in version 1.1 of the .NET Framework.

Begins a transaction at the data source.

Overload List

Begins a transaction at the data source.

[Visual Basic] Overloads Public Function BeginTransaction() As OdbcTransaction

[C#] public OdbcTransaction BeginTransaction();

[C++] public: OdbcTransaction* BeginTransaction();

[JScript] public function BeginTransaction() : OdbcTransaction;

Begins a transaction at the data source with the specified IsolationLevel value.

[Visual Basic] Overloads Public Function BeginTransaction(IsolationLevel) As OdbcTransaction

[C#] public OdbcTransaction BeginTransaction(IsolationLevel);

[C++] public: OdbcTransaction* BeginTransaction(IsolationLevel);

[JScript] public function BeginTransaction(IsolationLevel) : OdbcTransaction;

Example

[Visual Basic, C#, C++] The following example creates an OdbcConnection and an OdbcTransaction. It also demonstrates how to use the BeginTransaction, Commit, and Rollback methods.

[Visual Basic, C#, C++] Note   This example shows how to use one of the overloaded versions of BeginTransaction. For other examples that might be available, see the individual overload topics.

[Visual Basic] 
Public Sub RunOdbcTransaction(myConnString As String)
    Dim myConnection As New OdbcConnection(myConnString)
    myConnection.Open()
    
    Dim myCommand As OdbcCommand = myConnection.CreateCommand()
    Dim myTrans As OdbcTransaction
       
    ' Start a local transaction
    myTrans = myConnection.BeginTransaction(IsolationLevel.ReadCommitted)
    ' Assign transaction object for a pending local transaction
    myCommand.Transaction = myTrans
       
 Try
   myCommand.CommandText = "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')"
   myCommand.ExecuteNonQuery()
   myCommand.CommandText = "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')"
   myCommand.ExecuteNonQuery()
   myTrans.Commit()
   Console.WriteLine("Both records are written to database.")
 Catch e As Exception
   Try
     myTrans.Rollback()
   Catch ex As OdbcException
     If Not myTrans.Connection Is Nothing Then
       Console.WriteLine("An exception of type " & ex.GetType().ToString() & _
                         " was encountered while attempting to roll back the transaction.")
     End If
   End Try

   Console.WriteLine("An exception of type " & e.GetType().ToString() & _
                     "was encountered while inserting the data.")
   Console.WriteLine("Neither record was written to database.")
 Finally
   myConnection.Close()
 End Try
End Sub

[C#] 
public void RunOdbcTransaction(string myConnString)
{
   OdbcConnection myConnection = new OdbcConnection(myConnString);
   myConnection.Open();

   OdbcCommand myCommand = myConnection.CreateCommand();
   OdbcTransaction myTrans;

   // Start a local transaction
   myTrans = myConnection.BeginTransaction(IsolationLevel.ReadCommitted);
   // Assign transaction object for a pending local transaction
   myCommand.Transaction = myTrans;

 try
 {
   myCommand.CommandText = "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')";
   myCommand.ExecuteNonQuery();
   myCommand.CommandText = "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')";
   myCommand.ExecuteNonQuery();
   myTrans.Commit();
   Console.WriteLine("Both records are written to database.");
 }
 catch(Exception e)
 {
   try
   {
     myTrans.Rollback();
   }
   catch (OdbcException ex)
   {
     if (myTrans.Connection != null)
     {
       Console.WriteLine("An exception of type " + ex.GetType() +
                         " was encountered while attempting to roll back the transaction.");
     }
   }

   Console.WriteLine("An exception of type " + e.GetType() +
                     "was encountered while inserting the data.");
   Console.WriteLine("Neither record was written to database.");
 }
 finally
 {
   myConnection.Close();
 }
}

[C++] 
public:
void RunOdbcTransaction(String* myConnString)
{
    OdbcConnection* myConnection = new OdbcConnection(myConnString);
    myConnection->Open();

    OdbcCommand* myCommand = myConnection->CreateCommand();
    OdbcTransaction* myTrans;

    // Start a local transaction
    myTrans = myConnection->BeginTransaction(IsolationLevel::ReadCommitted);
    // Assign transaction Object* for a pending local transaction
    myCommand->Transaction = myTrans;

    try
    {
        myCommand->CommandText = S"Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')";
        myCommand->ExecuteNonQuery();
        myCommand->CommandText = S"Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')";
        myCommand->ExecuteNonQuery();
        myTrans->Commit();
        Console::WriteLine(S"Both records are written to database.");
    }
    catch (Exception* e)
    {
        try
        {
            myTrans->Rollback();
        }
        catch (OdbcException* ex)
        {
            if (myTrans->Connection != 0)
            {
                Console::WriteLine(S"An exception of type {0} was encountered while attempting to roll back the transaction.", ex->GetType());
            }
        }

    Console::WriteLine(S"An exception of type {0} was encountered while inserting the data.", e->GetType());
    Console::WriteLine(S"Neither record was written to database.");
    }
    myConnection->Close();
};

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button in the upper-left corner of the page.

See Also

OdbcConnection Class | OdbcConnection Members | System.Data.Odbc Namespace