OleDbTransaction.Rollback メソッド

トランザクションを保留中の状態からロールバックします。

Public Overridable Sub Rollback() Implements _
   IDbTransaction.Rollback
[C#]
public virtual void Rollback();
[C++]
public: virtual void Rollback();
[JScript]
public function Rollback();

実装

IDbTransaction.Rollback

例外

例外の種類	条件
Exception	トランザクションのコミット中にエラーが発生しました。
InvalidOperationException	トランザクションは、既にコミットまたはロールバックされています。 または 接続が切断されています。

解説

トランザクションは、保留中の状態 (BeginTransaction の呼び出し後、 Commit の呼び出し前) だけからロールバックできます。

使用例

[Visual Basic, C#, C++] OleDbConnection と OleDbTransaction を作成する例を次に示します。この例では、 BeginTransaction 、 Commit 、 Rollback の各メソッドの使い方も示します。

 
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()
    ' 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();
   // 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();
    // 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();
    }
 }

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必要条件

プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ

参照

OleDbTransaction クラス | OleDbTransaction メンバ | System.Data.OleDb 名前空間 | Commit | Begin | BeginTransaction