BeginTransaction(IsolationLevel) Method

In This Topic

Begins a database transaction with the specified isolation level.

Syntax

Visual Basic
C#

'Declaration
 
Public Overloads Shadows Function BeginTransaction( _
   ByVal il As IsolationLevel _
) As OracleTransaction

public new OracleTransaction BeginTransaction( 
   IsolationLevel il
)

Parameters

il

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.

Example

The following example creates a OracleConnection and a OracleTransaction. It also demonstrates how to use the BeginTransaction(), Commit, and Rollback methods.

csharp

public void RunOracleTransaction(string myConnString)
{
  OracleConnection myConnection = new OracleConnection(myConnString);
  myConnection.Open();

  OracleCommand myCommand = new OracleCommand();
  myCommand.Connection = myConnection;
  OracleTransaction 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 Dept(DeptNo, DName) Values(50, 'DEVELOPMENT')";
    myCommand.ExecuteNonQuery();
    myCommand.CommandText = "INSERT INTO Dept(DeptNo, DName) Values(60, 'PRODUCTION')";
    myCommand.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
  {
    myConnection.Close();
  }
}

Visual Basic

Public Sub RunOracleTransaction(myConnString As String)
  Dim myConnection As New OracleConnection(myConnString)
  myConnection.Open()

  Dim myCommand As New OracleCommand()
  myCommand.Connection = myConnection
  Dim myTrans As OracleTransaction

  ' 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 Dept(DeptNo, DName) Values(50, 'DEVELOPMENT')"
    myCommand.ExecuteNonQuery()
    myCommand.CommandText = "INSERT INTO Dept(DeptNo, DName) Values(60, 'PRODUCTION')"
    myCommand.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
    myConnection.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

Reference

OracleConnection Class
OracleConnection Members
Overload List
OracleCommand Class
OracleTransaction Class
Commit Method
Rollback Method

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