asked on

ADOTable problem

Here:

procedure TForm2.ADOTable1AfterOpen(DataSet: TDataSet);
var AutoIncCount : Integer;
begin
ADOTable1.Sort := 'ID DESC' ;
AutoIncCount := ADOTable1.Fieldbyname('Member_ID').Asinteger;
cxTextEdit1.Text := inttostr(AutoIncCount + 1) ;
cxTextEdit2.SetFocus;
end;

procedure TForm2.ADOTable1AfterScroll(DataSet: TDataSet);
begin
wwdblookupcombo1.text := ADOTable1.FieldByName('Member_ID').AsString ;
StatusBar1.Panels[0].Text := ' All records :' +IntToStr(ADOTable1.recordcount);
StatusBar1.Panels[1].Text:= ' Current record :' +inttostr(ADOTable1.RecNo);
end;

Problem is this:
How do I prevent the program from crashing down if the adotable1 is empty
at runtime??

pcsentinel

procedure TForm2.ADOTable1AfterOpen(DataSet: TDataSet);
var AutoIncCount : Integer;
begin
if not ADOTable1.Eof then
begin
ADOTable1.Sort := 'ID DESC' ;
AutoIncCount := ADOTable1.Fieldbyname('Member_ID').Asinteger;
cxTextEdit1.Text := inttostr(AutoIncCount + 1) ;
cxTextEdit2.SetFocus;
end;
end;

procedure TForm2.ADOTable1AfterScroll(DataSet: TDataSet);
begin
if not (ADOTable1.Bof) and (ADOTable1.Eof) then
begin
wwdblookupcombo1.text := ADOTable1.FieldByName('Member_ID').AsString ;
StatusBar1.Panels[0].Text := ' All records :' +IntToStr(ADOTable1.recordcount);
StatusBar1.Panels[1].Text:= ' Current record :' +inttostr(ADOTable1.RecNo);
end;
end;

Vrtnar

ASKER

It does not work right...
The only way it seems to work is :

procedure TForm2.ADOTable1AfterScroll(DataSet: TDataSet);
begin
if not ADOTable1.Bof then
begin ....

Why is it when I delete last record from table
StatusBar1.Panels[1].Text:= ' Current record :' +inttostr(ADOTable1.RecNo);
statusbar displays -1 ???

Amir Azhdari

Vrtnar
use ADOTable1.RecordCount in the events i mean :

procedure TForm2.ADOTable1AfterOpen(DataSet: TDataSet);
var AutoIncCount : Integer;
begin
if ADOTable1.RecordCount>0 then
begin
ADOTable1.Sort := 'ID DESC' ;
AutoIncCount := ADOTable1.Fieldbyname('Member_ID').Asinteger;
cxTextEdit1.Text := inttostr(AutoIncCount + 1) ;
cxTextEdit2.SetFocus;
end;
end;

procedure TForm2.ADOTable1AfterScroll(DataSet: TDataSet);
begin
if AdoTable1.RecordCount then
begin
wwdblookupcombo1.text := ADOTable1.FieldByName('Member_ID').AsString ;
StatusBar1.Panels[0].Text := ' All records :' +IntToStr(ADOTable1.recordcount);
StatusBar1.Panels[1].Text:= ' Current record :' +inttostr(ADOTable1.RecNo);
end;
end;

ASKER CERTIFIED SOLUTION

Amir Azhdari

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pcsentinel

I think the reason is that because its an empty recordset then there is no current record number so it returns a default '-1', use the code below

procedure TForm2.ADOTable1AfterScroll(DataSet: TDataSet);
begin
if not (ADOTable1.Bof) and (ADOTable1.Eof) then
begin
wwdblookupcombo1.text := ADOTable1.FieldByName('Member_ID').AsString ;
StatusBar1.Panels[0].Text := ' All records :' +IntToStr(ADOTable1.recordcount);
StatusBar1.Panels[1].Text:= ' Current record :' +inttostr(ADOTable1.RecNo);
end
else
begin
StatusBar1.Panels[0].Text := ' All records : 0';
StatusBar1.Panels[1].Text:= '';
end;
end;