> But the problem only exist, when A and B are NOT Null, so checking the

fields to

> NULL doesn't change anything.

Guido,

I create a table:
CREATE TABLE TESTE (
INDICE INTEGER NOT NULL
, TEXTO1 BLOB( 65535, 1 )
, TEXTO2 BLOB( 65535, 1 )
, CONSTRAINT PK_TESTE
PRIMARY KEY ( INDICE )
)

and used:

procedure TForm3.Button1Click(Sender: TObject);
var s,t:String;
begin
qr_fila.edit;
s:=qr_fila.fieldbyname('texto1').asString;
t:=qr_fila.fieldbyname('texto2').asString;
qr_fila.fieldbyname('texto1').asString:=s+t;
qr_fila.post;
end;

all works well and I used a tib_query to do it.

Which version of IBO are you using?
Are you TIBOXXX or TIB_XX components?

Luiz.