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Timestamps (binary) and SQL-Server/ADO-Clientside but using queries/Delphi

Posted on 2003-12-05
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Last Modified: 2010-04-03
I'm using SQL-Server 2k and Delphi-ADO/ClientSide Cursors but use queries...

I populate a combobox with all the records.  

I have included a timestamp column in my table.  ( i understand its not for date/time values)

What i need is whenever I select an item from the combobox, to check if the time stamp changed from the last time it was read, and if that's true then to remove and reinsert the value inside the combobox... At the moment i'm doing it like this:

x := Combo.ItemIndex;

if Combo.Text <> Query.FieldByName('ColumnName').AsString then
   begin
      Combo.Items.Delete(x);
      Combo.Items.Insert(x,Query.FieldByName('ColumnName').AsString);
      Combo.ItemIndex := x;
   end;

But i need to use TimeStamps...

Any ideas appreciated...

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Question by:nick-p
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1 Comment
 
LVL 22

Accepted Solution

by:
Mohammed Nasman earned 500 total points
ID: 9891461
Hello

  I found this function in borland newsgroups that will allow you to read the TimeStamp field as string,

type
  SQLTimestamp = array [0..7] of Byte;
  PSQLTimestamp = ^SQLTimestamp;

function TSToStr(const vTS: Variant): string;
  var
    p: PSQLTimestamp;
begin
  p := VarArrayLock(vTS);
  try
    Result := Format('0x%.2x%.2x%.2x%.2x%.2x%.2x%.2x%.2x',
    [p^[0], p^[1], p^[2], p^[3], p^[4], p^[5], p^[6], p^[7]]);
  finally
     VarArrayUnlock(vTS);
  end;
end;

and you can easily read the TimeStamp field and convert it string, that you compare it or doing whatever you want

procedure TForm1.Button1Click(Sender: TObject);
var
  V : Variant;
begin
  V := AdoTable1['MyTimeStamp'];
  ShowMessage(TSToStr(V));
end;

HTH

Regards,
Mohammed
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