V4RB 1.1 RB 5.5 cursors

[olivier vidal]

>
> 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()
>

Ah, I understand  now!

It is necessary to use cursor=database.sqlselect () !

To use a cursor, I always use a constructor to obtain a subclass of 
Vcursor (for triggers....).
And I already test if curs < > nil and verified the errors + realbasic 
NilObjectException. But from the construction of the cursor, if there 
was an error (wrong sql string, lock cursor....), my app crashed 
immediately.
Why?

in V4RBR doc (p.62):
"If you want to define a subclass of Vcursor than you need to use the 
constructor of vCursor"

But if there is no security with constructor, it is very boring !
  There is not the other solution to use a subclass of vcursor and be 
also able to handle errors ?

>
> There is no IN THE SAME TIME.
>
> Exists queue.
>
> You get error.
>
> I think future we will add some e.g. 3 seconds delay
> And ability to control this.
> macserve.net/mailman/listinfo/valentina

In Valentina 1.x,
in multi-user application, To be certain that the cursor is create, it 
is always necessary to test it in a loop and to try to create it as 
long as the error " KCannotSetLock " returned ?
It is the solution?


thank you

olivier