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");
}
this.state = TransactionState.TrasactionStarting;
try
{
this.db.Send.Write(IscCodes.op_transaction);
this.db.Send.Write(this.db.Handle);
this.db.Send.WriteBuffer(tpb.ToArray());
this.db.Send.Flush();
this.handle = db.ReadGenericResponse().ObjectHandle;
this.state = TransactionState.TransactionStarted;
this.db.TransactionCount++;
}
catch (IOException)
{
throw new IscException(IscCodes.isc_net_read_err);
}
}
}
protected override void Seek(int position)
{
lock (this.db)
{
try
{
this.db.Send.Write(IscCodes.op_seek_blob);
this.db.Send.Write(this.blobHandle);
this.db.Send.Write(0); // Seek mode
this.db.Send.Write(position); // Seek offset
this.db.Send.Flush();
GdsResponse r = db.ReadGenericResponse();
this.position = r.ObjectHandle;
}
catch (IOException)
{
throw new IscException(IscCodes.isc_network_error);
}
}
}