>Before (IBO 4.6), I was create a query in this way :
>
> m:=TIB_Query.Create(Self);
> m.IB_Connection:=SetFB.IB_Connection;
> m.sql.clear;
> m.sql.add('DELETE FROM CLIENTS');
> m.sql.add('WHERE id_client='+IntToStr(nId)+';');
>---> m.ExecSQL;

what happens if you change the first line to:

m:=TIB_DSQL.Create(Self);

I've no idea whether using a TIB_Query should work or not, but I use TIB_Query when I need a bidirectional dataset, TIB_Cursor when a unidirectional dataset would suffice, TIB_DSQL when I want to execute something and sometimes TIB_Script when I want to execute many things.

HTH,
Set