[Lazarus] Is anyone working with the simple datasets?

[Joost van der Sluis]

Op maandag 14-04-2008 om 20:35 uur [tijdzone -0300], schreef Felipe
Monteiro de Carvalho:
> On Mon, Apr 14, 2008 at 10:05 AM, Graeme Geldenhuys
> <graemeg.lists at gmail.com> wrote:
> >  constructor TMainForm.Create(AOwner: TComponent);
> >  var
> >    fields: TDbfFieldDefs;
> >
> > begin
> >    inherited Create(AOwner);
> >    DataSet             := TDBF.Create(Self);
> >    DataSet.TableName   := 'temp.dbf';
> ..........
> 
> Thanks, this worked perfectly =) Maybe the problem with TDBf is that I
> was passing zero to the size of the string field. I had just thougth
> that I don't care about the size and giving zero would make it a field
> that can accept any size ...

You shoudn't think, but look it up. ;) Normally databases do not have
'sizeless' fields. That would be way too inefficient. There are BLOB's
(clob's?) for that purpose.

Note that if you define a string field with a size of 5000, for each
record 5000 bytes of memory will be allocated. Two such fields, 100
records and your dataset need at least 1 MB of memory....

Joost.