open status

[-= JB =-]

In your recent replies you explained dbRef very good below
and another answer asked me to explain my task.

The task is simple.  All I wanted to do was use the throwout
command.  It said the database needed to be closed to use
it so I started thinking it needed a file path instead of dbRef.
Then I started looking for a way to make sure the database
was closed so the user would not get an error.

After your explanation and my reading it better I realize the
Throwout command uses a dbRef.  Therefore to use it I will
need to open the database first and then close it before I
can use Throwout with dbRef.

Maybe I need to keep track of databases that have already
been opened to eliminate the confusion.  Is there a problem
with opening a database that has already been opened?  If
not then I could just open it, close it and throwout even if it
was open already.

-=>JB<=-



On Jan 17, 2008, at 2:20 AM, Ruslan Zasukhin wrote:

> On 17/1/08 11:46 AM, "-= JB =-" <sundown at pacifier.com> wrote:
>
>> You are right it says dbRef.  But if the database has not
>> been opened how do you get a dbRef.
>
> If you have no dbRef on hands, then you 100% know that it is  
> closed :-)
>
>> Is the dbRef the
>> number returned when a database gets opened.
>
>     dbRef = VDatabase_New
>
>     // db still is closed
>
>     VDatabase_Open( dbRef, path )
>
>     // now database is opened.
>     VDatabase_IsOpen( dbref )  -> true
>
>
>     Vdatabase_Close( dbRef )
>
>     // now database is closed.
>     VDatabase_IsOpen( dbref )  -> false
>
>
>> If so
>> how do I check to see if database1 is opened and it has
>> not been opened yet.  It would not have a dbRef to use.
>
>
> It seems to me, you think about case -- when one user can open db and
> another again try open it ???
>
> Am I right ?
>
> This is called SHARED ACCESS to db file
> Valentina not support this.
>
> If you need multi-user access to database, you need use Valentina  
> Server.
>
>
> -- 
> 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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