internal OdbcTransaction Open_BeginTransaction(System.Data.IsolationLevel isolevel)
{
ExecutePermission.Demand();
this.CheckState("BeginTransaction");
this.RollbackDeadTransaction();
if ((this.weakTransaction != null) && this.weakTransaction.IsAlive)
{
throw ADP.ParallelTransactionsNotSupported(this);
}
switch (isolevel)
{
case System.Data.IsolationLevel.Unspecified:
case System.Data.IsolationLevel.ReadUncommitted:
case System.Data.IsolationLevel.ReadCommitted:
case System.Data.IsolationLevel.RepeatableRead:
case System.Data.IsolationLevel.Serializable:
case System.Data.IsolationLevel.Snapshot:
{
OdbcConnectionHandle connectionHandle = this.ConnectionHandle;
ODBC32.RetCode retcode = connectionHandle.BeginTransaction(ref isolevel);
if (retcode == ODBC32.RetCode.ERROR)
{
this.HandleError(connectionHandle, retcode);
}
OdbcTransaction target = new OdbcTransaction(this, isolevel, connectionHandle);
this.weakTransaction = new WeakReference(target);
return(target);
}
case System.Data.IsolationLevel.Chaos:
throw ODBC.NotSupportedIsolationLevel(isolevel);
}
throw ADP.InvalidIsolationLevel(isolevel);
}
internal OdbcTransaction Open_BeginTransaction(IsolationLevel isolevel)
{
OdbcConnection.ExecutePermission.Demand();
CheckState(ADP.BeginTransaction); // MDAC 68323
RollbackDeadTransaction();
if ((null != this.weakTransaction) && this.weakTransaction.IsAlive) // regression from Dispose/Finalize work
{
throw ADP.ParallelTransactionsNotSupported(this);
}
//Use the default for unspecified.
switch (isolevel)
{
case IsolationLevel.Unspecified:
case IsolationLevel.ReadUncommitted:
case IsolationLevel.ReadCommitted:
case IsolationLevel.RepeatableRead:
case IsolationLevel.Serializable:
case IsolationLevel.Snapshot:
break;
case IsolationLevel.Chaos:
throw ODBC.NotSupportedIsolationLevel(isolevel);
default:
throw ADP.InvalidIsolationLevel(isolevel);
}
;
//Start the transaction
OdbcConnectionHandle connectionHandle = ConnectionHandle;
ODBC32.RetCode retcode = connectionHandle.BeginTransaction(ref isolevel);
if (retcode == ODBC32.RetCode.ERROR)
{
HandleError(connectionHandle, retcode);
}
OdbcTransaction transaction = new OdbcTransaction(this, isolevel, connectionHandle);
this.weakTransaction = new WeakReference(transaction); // MDAC 69188
return(transaction);
}