parameterised queries delphi

Hi: I am using delphi (in BDS 2006). It is great for interrogating paradox tables.
We have a manufacturing system based on paradox. We ALSO have an IDENTICAL system in SQL
I need to query  both paradox and SQL  to pull together the data.
The queries return all invoices for a date specified in edit1 box on the form.
Below are the two queries; Query1 on button1 is Paradox, ADOQuery1  on button3 is SQL
Paradox works fine; the SQL does not. The pkrase 'AsDate', fine in Query1, is rejected in the SQL query
Does anybody know how to get the SQL parameter to work in the same way as the Paradox query?  My attempts have been commented out ; the query works fine without them.

procedure TForm1.Button1Click(Sender: TObject);
begin
 Query1.SQL.Clear;
Query1.SQL.Add('SELECT DISTINCT  D.OrderNo,D.InvNo, D.Invoiced, D.AccNo, D.CRef,D.Nett, D.VAT, D1.SLAcc' );
 Query1.SQL.Add(' FROM "GOOrders.DB" D, "GOAccs.DB" D1 WHERE D.AccNo = D1.AccNo AND  D.Invoiced = :SELMONTH  ORDER BY  D.AccNo');
 Query1.ParamByName('SELMONTH').AsDate := StrToDate(Edit1.Text);
 Query1.Open;
  SMExportTodbf1.Execute;
end;

procedure TForm1.Button2Click(Sender: TObject);

var
  lined : TDate;
 begin
  lined := (Date);
  Edit1.Text := DateToStr(lined);


end;

procedure TForm1.Button3Click(Sender: TObject);
begin
ADOQuery1.SQL.Clear;
ADOQuery1.SQL.Add('SELECT Dbo_goorders.OrderNo, Dbo_goorders.InvNo,  Dbo_goorders.Invoiced, Dbo_goorders.AccNo, Dbo_goorders.cref, Dbo_goorders.Nett, Dbo_goorders.VAT, Dbo_goaccs.SLAcc');
ADOQuery1.SQL.Add('FROM GOOrders Dbo_goorders INNER JOIN GoAccs Dbo_goAccs ');
ADOQuery1.SQL.Add(' ON  (Dbo_goorders.Accno = Dbo_goAccs.Accno) ');
//ADOQuery1.SQL.Add('WHERE   Dbo_goorders.Invoiced = :SELMONTHd  order by Dbo_goorders.accno');
//ADOQuery1.Parameters.ParamByName('SELMONTHd'):= StrToDate(Edit1.Text);
 ADOQuery1.Open;
 SMExportTodbf2.Execute;
end;
Richard TeasdaleFinancial ControllerAsked:
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Richard TeasdaleFinancial ControllerAuthor Commented:
Sorted! Panic over. Two lines; first sets datatype, second value
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PortletPaulfreelancerCommented:
what is the final result of the query string ADOQuery1.SQL? can you display it? (and share it here)
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PortletPaulfreelancerCommented:
oh. OK.

I thought it may have been a missing space (e.g. in front of FROM)

I always suggest including a  leading space when appending to SQL query

ADOQuery1.SQL.Add(' FROM GOOrders Dbo_goorders INNER JOIN GoAccs Dbo_goAccs ');
                   ^
                   ^
                   ^
                   ^

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Sinisa VukCommented:
Before closing... I suggest to use SQL property as text:
ADOQuery1.SQL.Text := 'select .. from table1 where '+
  'field1=:param1 and filed2=:param2';

Open in new window


...but I work mostly:
ADOQuery1.SQL.Text := 'select .. from table1 where '+
  'field1='+IntToStr(iParam1)+' and filed2='+QuotedStr(sParam2);

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Richard TeasdaleFinancial ControllerAuthor Commented:
Answered my own question
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