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 MySqlTransaction

public new MySqlTransaction 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.

To ensure that the dotConnect for MySQL transaction management model performs correctly, avoid using other transaction management models, such as those provided by MySQL.

In MySQL, only InnoDB and BDB (BerkeleyDB) table formats support transactions. Other standard storage engines ignore transactions and can not rollback data modifications.

Example

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

csharp

public void RunMySqlTransaction(string myConnString)
{
  MySqlConnection myConnection = new MySqlConnection(myConnString);
  myConnection.Open();

  MySqlCommand myCommand = new MySqlCommand();
  myCommand.Connection = myConnection;
  MySqlTransaction 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 RunMySqlTransaction(myConnString As String)
  Dim myConnection As New MySqlConnection(myConnString)
  myConnection.Open()

  Dim myCommand As New MySqlCommand()
  myCommand.Connection = myConnection
  Dim myTrans As MySqlTransaction

  ' 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

MySqlConnection Class
MySqlConnection Members
Overload List
MySqlCommand Class
MySqlTransaction Class
Commit Method
Rollback Method

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