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How to display NULL values in DBGrid ?

Posted on 2003-11-02
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Last Modified: 2010-04-03
Hi!

Can somebody tell me how to display NULL values in a DBGrid ? ... the way things work is it displays an empty field and showing an empty field isn't correct as its missleading since an empty string is not the same as NULL.

BTW, I can easily work around it for TStringField, TBlob, TMemo, but fields such as TDateTime, TDate, TIntegerField isn't that trivial.
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Question by:delphi112497
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kretzschmar earned 250 total points
ID: 9666509
usual each tfield has an isNull property,
where could be evaluated if there is a NullValue

>an empty field isn't correct as its missleading
>since an empty string is not the same as NULL.
btw. in oracle an empty varchar2-field is NULL (same as '')

you could use the OnGetText-Event of the TField for Display-Issues like

procedure TForm1.ADOTable1xGetText(Sender: TField; var Text: String;
  DisplayText: Boolean);
begin
  if Sender.IsNull Then
    Text := '{NULL}'  //for example
  else
    Text := Sender.AsString;
end;

meikl ;-)
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