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OleDbConnection.BeginTransaction Method

Begins a database transaction.

Overload List

Begins a database transaction.

[Visual Basic] Overloads Public Function BeginTransaction() As OleDbTransaction
[C#] public OleDbTransaction BeginTransaction();
[C++] public: OleDbTransaction* BeginTransaction();
[JScript] public function BeginTransaction() : OleDbTransaction;

Begins a database transaction with the current IsolationLevel value.

[Visual Basic] Overloads Public Function BeginTransaction(IsolationLevel) As OleDbTransaction
[C#] public OleDbTransaction BeginTransaction(IsolationLevel);
[C++] public: OleDbTransaction* BeginTransaction(IsolationLevel);
[JScript] public function BeginTransaction(IsolationLevel) : OleDbTransaction;

Example

[Visual Basic, C#, C++] The following example creates an OleDbConnection and an OleDbTransaction. It also demonstrates how to use the BeginTransaction, a 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 RunOleDbTransaction(myConnString As String)
    Dim myConnection As New OleDbConnection(myConnString)
    myConnection.Open()
    
    Dim myCommand As OleDbCommand = myConnection.CreateCommand()
    Dim myTrans As OleDbTransaction
       
    ' Start a local transaction
    myTrans = myConnection.BeginTransaction(IsolationLevel.ReadCommitted)
    ' Assign transaction object for a pending local transaction
    myCommand.Connection = myConnection
    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 OleDbException
        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 RunOleDbTransaction(string myConnString)
{
   OleDbConnection myConnection = new OleDbConnection(myConnString);
   myConnection.Open();

   OleDbCommand myCommand = myConnection.CreateCommand();
   OleDbTransaction myTrans;

   // Start a local transaction
   myTrans = myConnection.BeginTransaction(IsolationLevel.ReadCommitted);
   // Assign transaction object for a pending local transaction
   myCommand.Connection = myConnection;
   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 (OleDbException 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 RunOleDbTransaction(String* myConnString)
 {
    OleDbConnection* myConnection = new OleDbConnection(myConnString);
    myConnection->Open();

    OleDbCommand* myCommand = myConnection->CreateCommand();
    OleDbTransaction* myTrans;

    // Start a local transaction
    myTrans = myConnection->BeginTransaction(IsolationLevel::ReadCommitted);
    // Assign transaction object for a pending local transaction
    myCommand->Connection = myConnection;
    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 (OleDbException* 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.");
    }
    __finally 
    {
      myConnection->Close();
    }
 }

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

See Also

OleDbConnection Class | OleDbConnection Members | System.Data.OleDb Namespace

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