public void BeginTransaction(TransactionParameterBuffer tpb)
{
lock (this.db)
{
if (this.state != TransactionState.NoTransaction)
{
throw new IscException(
IscCodes.isc_arg_gds,
IscCodes.isc_tra_state,
this.handle,
"no valid");
}
IscTeb teb = new IscTeb();
IntPtr tebData = IntPtr.Zero;
try
{
this.state = TransactionState.TrasactionStarting;
// Set db handle
teb.dbb_ptr = Marshal.AllocHGlobal(4);
Marshal.WriteInt32(teb.dbb_ptr, this.db.Handle);
// Set tpb length
teb.tpb_len = tpb.Length;
// Set TPB data
teb.tpb_ptr = Marshal.AllocHGlobal(tpb.Length);
Marshal.Copy(tpb.ToArray(), 0, teb.tpb_ptr, tpb.Length);
// Alloc memory for the IscTeb structure
int size = Marshal.SizeOf(typeof(IscTeb));
tebData = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(teb, tebData, true);
int[] statusVector = FesConnection.GetNewStatusVector();
int trHandle = this.handle;
FbClient.isc_start_multiple(
statusVector,
ref trHandle,
1,
tebData);
this.handle = trHandle;
// Parse status vector
this.db.ParseStatusVector(statusVector);
// Update transaction state
this.state = TransactionState.TransactionStarted;
// Update transaction count
this.db.TransactionCount++;
}
catch (Exception)
{
throw;
}
finally
{
// Free memory
if (teb.dbb_ptr != IntPtr.Zero)
{
Marshal.FreeHGlobal(teb.dbb_ptr);
}
if (teb.tpb_ptr != IntPtr.Zero)
{
Marshal.FreeHGlobal(teb.tpb_ptr);
}
if (tebData != IntPtr.Zero)
{
Marshal.DestroyStructure(tebData, typeof(IscTeb));
Marshal.FreeHGlobal(tebData);
}
}
}
}