Mac for drector.

[Jennifer Hall]

Another question.
If I open a busy data base on the mac, don't get an error, try to read it,
get an error. What is the possibility of not being able to close the data
base????

I'm seeing weird things happen after attempting to read a busy data base,
closing it, and then trying to open and read an unbusy data base. The unbusy
data base gives me errors on the opening???

Jennifer

-----Original Message-----
From: valentina-bounces at lists.macserve.net
[mailto:valentina-bounces at lists.macserve.net] On Behalf Of Ruslan Zasukhin
Sent: Wednesday, August 09, 2006 2:32 AM
To: valentina at lists.macserve.net
Subject: Re: Mac for drector.

On 8/9/06 4:09 AM, "Jennifer Hall" <jennifer at jennifershall.com> wrote:

Hi Jennifer, 

> I'm using Valentina 1 for director on both the Mac and the PC.
> In trying to detect if a database is busy I'm using the following code.
> 
> ---------------------------------------
>   --use actual valentina data base call to open
>     openDatabase(pCurrentDataBase, dbpath, 4)
>     err = ValentinaError()
>     if (err <> 0 ) then
>       -- error while open data base
>       return err
>     end if
>     
>     pRef = pCurrentDataBase.getRef()
>     -- return negative number if error, else returns 0 if no error
>     err = ValentinaError()
>     if (err <> 0 ) then
>       -- error while open data base
>       return err
>     end if
> 
> sql = "select Name, PretestOn, PasswordOn, MasteryLevel, RecID from
> Classes"
>   pCursor = xtra("VCursor").new(pCurrentDataBase.getRef(), sql,2,3,2) --DC
>   err = ValentinaError()
>   if (err <> 0) then
>     return []
>   end if
> --------------------------
> I've set it up for the test so that I know a specific data base is busy.
On
> the pc, the openDatabase call returns an error and you know it's busy.
> However, on the mac, I don't get an error until the pCursor call.
> 
> Any idea why and any suggestions to get the Mac to recognize an open
> database.

Mac OS X do not have exclusive mode of file open. This is why.

Apple recommend resolve this creating near to file you open
A tmp empty may be hidden disk file. So other app must check at first if
this file present..

Sounds like nightmare, but this is how linux work
 

-- 
Best regards,

Ruslan Zasukhin
VP Engineering and New Technology
Paradigma Software, Inc

Valentina - Joining Worlds of Information
http://www.paradigmasoft.com

[I feel the need: the need for speed]


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