Begins a transaction at the database.
[Visual Basic]
Overloads Public Function BeginTransaction() As DB2Transaction
[C#]
public DB2Transaction
BeginTransaction();
[C++]
public: DB2Transaction
* BeginTransaction();
[JScript]
public function BeginTransaction() : DB2Transaction
;
An object representing the new transaction.
Exception type | Condition |
---|---|
InvalidOperationException | A transaction is currently active. Parallel transactions are not supported. |
To commit or roll back the transaction, you must explicitly use the DB2Transaction.Commit or DB2Transaction.Rollback methods.
[Visual Basic, C#] The following example creates a DB2Connection and a DB2Transaction . It also demonstrates how to use the BeginTransaction, DB2Transaction.Commit , and DB2Transaction.Rollback methods.
[Visual Basic]
Public Sub RunDB2Transaction(myConnString As String)
Dim myConnection As New DB2Connection(myConnString)
myConnection.Open()
Dim myCommand As New DB2Command()
Dim myTrans As DB2Transaction
' Start a local transaction
myTrans = myConnection.BeginTransaction()
' Assign transaction object for a pending local transaction
myCommand.Transaction = myTrans
Try
myCommand.CommandText = "Insert into STAFF (ID, NAME) VALUES (...)"
myCommand.ExecuteNonQuery()
myCommand.CommandText = "Insert into STAFF (ID, NAME) VALUES (...)"
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
[C#]
public void RunDB2Transaction(string myConnString)
{
DB2Connection myConnection = new DB2Connection(myConnString);
myConnection.Open();
DB2Command myCommand = new DB2Command();
DB2Transaction myTrans;
// Start a local transaction
myTrans = myConnection.BeginTransaction();
// Assign transaction object for a pending local transaction
myCommand.Transaction = myTrans;
try
{
myCommand.CommandText = "Insert into STAFF (ID, NAME) VALUES (...)";
myCommand.ExecuteNonQuery();
myCommand.CommandText = "Insert into STAFF (ID, NAME) VALUES (...)";
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();
}
}