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Board index FiveWin for Harbour/xHarbour Strange problem sorting a dbf file
Posts: 858
Joined: Fri Oct 07, 2005 12:00 PM
Strange problem sorting a dbf file
Posted: Thu Jun 12, 2008 09:24 AM

Hi,
I have a really strange problem when I try to sort a dbf file using the command SORT ON .

In this self-contained sample

www.softwarexp.co.uk/beta/browse.zip
I create a new dbf (date ordered) form a source dbf but the order is incorrect (see www.softwarexp.co.uk/beta/browse.gif)

Any ideas ? Thanks in advance.

Best Regards,



Marco Turco

SOFTWARE XP LLP
Posts: 6983
Joined: Fri Oct 07, 2005 07:07 PM
Strange problem sorting a dbf file
Posted: Thu Jun 12, 2008 10:26 AM
Marco, I think you mixed up long and short date format.
Regards,
Otto

Posts: 858
Joined: Fri Oct 07, 2005 12:00 PM
Strange problem sorting a dbf file
Posted: Thu Jun 12, 2008 10:48 AM
Hi Otto,
the date values seem to be corrected.



Which dbf editor are you using ?
Best Regards,



Marco Turco

SOFTWARE XP LLP
Posts: 9020
Joined: Thu Oct 06, 2005 08:17 PM
Strange problem sorting a dbf file
Posted: Thu Jun 12, 2008 12:22 PM

I confirm what Otto has found.

EMG

Posts: 858
Joined: Fri Oct 07, 2005 12:00 PM
Strange problem sorting a dbf file
Posted: Thu Jun 12, 2008 01:32 PM

Hi Enrico,
How did you check the dates ?

I checked them using the Norton Commander dbview and the Open Office "Calc" and all displayed well.

Best Regards,



Marco Turco

SOFTWARE XP LLP
Posts: 6983
Joined: Fri Oct 07, 2005 07:07 PM
Strange problem sorting a dbf file
Posted: Thu Jun 12, 2008 01:35 PM

Marco, try your code with
SET CENTURY ON
Regards,
Otto

include "FiveWin.ch"

function Main()
set century on
set date french

use testm

sort on lb02/a to results
use

USE results

Browse()

USE

return nil

Posts: 782
Joined: Wed Dec 19, 2007 07:50 AM
Strange problem sorting a dbf file
Posted: Thu Jun 12, 2008 02:00 PM
Enrico Maria Giordano wrote:I confirm what Otto has found.

Hi Marco:

Certainly you have a mixture of date formats, try this to fix your database:

Use Test
Replace lb02 With CtoD( DtoC( lb02 ) ) All

Regards.

Manuel Mercado
manuelmercado at prodigy dot net dot mx
Posts: 9020
Joined: Thu Oct 06, 2005 08:17 PM
Strange problem sorting a dbf file
Posted: Thu Jun 12, 2008 02:53 PM
Marco Turco wrote:Hi Enrico,
How did you check the dates ?

I checked them using the Norton Commander dbview and the Open Office "Calc" and all displayed well.


I'm using my own EMAG Software DBU:

http://www.emagsoftware.it/gratis.htm

EMG
Posts: 858
Joined: Fri Oct 07, 2005 12:00 PM
Strange problem sorting a dbf file
Posted: Fri Jun 13, 2008 08:39 AM

Yes, it was a date issue.

I was unable to detect it due the fact that my (very very old) Norton Commander dbView displayed those dates exactly.

Thanks to all for the support.

Best Regards,



Marco Turco

SOFTWARE XP LLP
Posts: 114
Joined: Tue Feb 14, 2006 08:13 AM
Strange problem sorting a dbf file
Posted: Wed Jun 25, 2008 02:47 PM
Marco Turco wrote:Yes, it was a date issue.

I was unable to detect it due the fact that my (very very old) Norton Commander dbView displayed those dates exactly.

Thanks to all for the support.


Marco hi,
It's one of the best practices to use CENTURY ON, in other words, to
use the format dd/mm/yyyy, thus, you will avoid problems with some
centuries that don't exist any more (or are not usable), such as 0007
vice 2007 !
You can use in your main program at the entry point along with the
SET DATE .... (e.g. ITALIAN), SET EPOCH TO ...
here's an example of what I use...
SET DATE BRITISH
SET EPOCH TO 1980
SET CENTURY ON
When users are lazy and type only the two last digits of a year, e.g.
"31/12/07", the program automatically converts it to "31/12/2007"
and not into "31/12/0007".

Another problem fixed below, is for displaying date fields in the browser
(e.g. TWBROWSE, or XBROWSE), with this method...


        REDEFINE LISTBOX oLbx1 FIELDS ;
                     PADC(History->STATUS,3)  ,;    // STATUS "S" or blank
               Right(History->HISTNUMB,5) , ;       // Autom.number
               Right(History->FILENUMB,6) , ;       // File number
     SCTOC(DTOC(StoD(History->HISTDATE))) , ;       // Date (dd-mm-yy)
.....
                   HEADERS  "St."          ,;
                           "Hist"        ,;
                           "File"        ,;
                           "Off.Date"     ,;


The function SCTOC(...) converts the year into two digits thus, gaining
some width in the browser. Here's the function.

Function SCTOC(x)
*---------------- Returns a date (Char type) from 10 chars to 8 chars (Sort)
* SCTOC(DTOC(StoD(History->HISTDATE))),;         // Date (dd-mm-yy)
   Local z := ""

   if len(x) == 8
      Return (x)
   endif
   z := left(x, 6)  +;  // 18-01-2003
        right(x,2)
   Return (z)


Kind regards
Evans
ps. I hope it helps you a little...

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