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 UniTransaction

public new UniTransaction BeginTransaction( 
   IsolationLevel il
)

Parameters

il: Isolation level, one of System.Data.IsolationLevel values.

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.

For the list of supported isolation levels refer to UniTransaction.IsolationLevel property.

Example

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

csharp

public void RunUniTransaction(string myConnString)
{
  UniConnection myConnection = new UniConnection(myConnString);
  myConnection.Open();

  UniCommand myCommand = new UniCommand();
  UniTransaction 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 Test.Dept(DeptNo, DName) Values(50, 'DEVELOPMENT')";
    myCommand.ExecuteNonQuery();
    myCommand.CommandText = "INSERT INTO Test.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 RunUniTransaction(myConnString As String)
  Dim myConnection As New UniConnection(myConnString)
  myConnection.Open()

  Dim myCommand As New UniCommand()
  Dim myTrans As UniTransaction

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

UniConnection Class
UniConnection Members
Overload List
UniCommand Class
UniTransaction Class
Commit Method
Rollback Method

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