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Devart.Data.SQLite Namespace / SQLiteConnection Class / BeginTransaction Method / BeginTransaction(IsolationLevel) Method
Example

In This Topic
    BeginTransaction(IsolationLevel) Method
    In This Topic
    Begins a database transaction with the specified isolation level.
    Syntax
    'Declaration
     
    Public Overloads Shadows Function BeginTransaction( _
       ByVal isolationLevel As IsolationLevel _
    ) As SQLiteTransaction
    public new SQLiteTransaction BeginTransaction( 
       IsolationLevel isolationLevel
    )

    Parameters

    isolationLevel

    Return Value

    An object representing the new transaction.
    Remarks
    To commit or roll back the transaction, you must explicitly use the Commit or Rollback methods.

    SQLite supports only Serializable isolation level.

    Example
    The following example creates a SQLiteConnection and a SQLiteTransaction. It also demonstrates how to use the BeginTransaction(), Commit, and Rollback methods.
    public void RunSQLiteTransaction(string myConnString)
    {
      SQLiteConnection sqConnection = new SQLiteConnection(myConnString);
      sqConnection.Open();
    
      SQLiteCommand sqCommand = new SQLiteCommand();
      sqCommand.Connection = sqConnection;
      SQLiteTransaction myTrans;
    
      // Start a local transaction
      myTrans = sqConnection.BeginTransaction(IsolationLevel.Serializable);
      // Assign transaction object for a pending local transaction
      sqCommand.Transaction = myTrans;
    
      try
      {
        sqCommand.CommandText = "INSERT INTO Dept(DeptNo, DName) Values(50, 'DEVELOPMENT')";
        sqCommand.ExecuteNonQuery();
        sqCommand.CommandText = "INSERT INTO Dept(DeptNo, DName) Values(60, 'PRODUCTION')";
        sqCommand.ExecuteNonQuery();
        myTrans.Commit();
        Console.WriteLine("Both records are written to database.");
      }
      catch(Exception e)
      {
        myTrans.Rollback();
        Console.WriteLine(e.ToString());
        Console.WriteLine("Neither record was written to database.");
      }
      finally
      {
        sqConnection.Close();
      }
    }
    Public Sub RunSQLiteTransaction(myConnString As String)
      Dim sqConnection As New SQLiteConnection(myConnString)
      sqConnection.Open()
    
      Dim sqCommand As New SQLiteCommand()
      sqCommand.Connection = sqConnection
      Dim myTrans As SQLiteTransaction
    
      ' Start a local transaction
      myTrans = sqConnection.BeginTransaction(IsolationLevel.Serializable)
      ' Assign transaction object for a pending local transaction
      sqCommand.Transaction = myTrans
    
      Try
        sqCommand.CommandText = "INSERT INTO Dept(DeptNo, DName) Values(50, 'DEVELOPMENT')"
        sqCommand.ExecuteNonQuery()
        sqCommand.CommandText = "INSERT INTO Dept(DeptNo, DName) Values(60, 'PRODUCTION')"
        sqCommand.ExecuteNonQuery()
        myTrans.Commit()
        Console.WriteLine("Both records are written to database.")
      Catch e As Exception
        myTrans.Rollback()
        Console.WriteLine(e.ToString())
        Console.WriteLine("Neither record was written to database.")
      Finally
        sqConnection.Close()
      End Try
    End Sub
    Requirements

    Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

    See Also