V4RB 1.1 RB 5.5 cursors

[Ruslan Zasukhin]

On 6/14/04 9:28 AM, "olivier vidal" <vidal_olivier at yahoo.fr> wrote:

> - in kernel doc :
> 
> "in the case Valentina cannot obtain lock for at least one record of
> cursor, it return error kCannotSetLock and cursor is not created"
> 
> Nevertheless, if I create e.g., a cursor with a READ / WRITE lock on 1
> recording, and which I try then to create a READ cursor on the same
> recording, my application crashes. It is normal that the second cursor
> is not created, but how to avoid the crash?

I think 2 ways

1) curs = db.SqlSelect()

Now you must check if cursor is not nil

    if( curs <> nil )
        then you use it


2) also you can and should check error code after SqlSelect()


> - Even if I create small cursors opened little time. How the server is
> going to react when two users will try to put a lock at the same time
> on the same recording?

There is no IN THE SAME TIME.

Exists queue. 

> If the first cursor is fast and is opened little time, the demand of
> lock of the second cursor is put in wait and is treated as soon as
> possible? Or there is an error and the second cursor is not created?

You get error.

I think future we will add some e.g. 3 seconds delay
And ability to control this.

-- 
Best regards,
Ruslan Zasukhin      [ I feel the need...the need for speed ]
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e-mail: ruslan at paradigmasoft.com
web: http://www.paradigmasoft.com

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