Re: [Firebird-devel] IAttachment::execute() returned value

[Alex P. <pes...@ma...>]

On 9/17/22 18:54, Dimitry Sibiryakov wrote:
> Hello All.
>
>   What are rules for plugin's returned value of IAttachment::execute() 
> in the case when input transaction is not NULL?
>

That depends upon statement executed.

> Should it return NULL?

In a case of commit/rollback - yes.

> Should it return the original transaction?

For all non-transacton-control statements - yes.

> Should it return current plugin's original transaction (i.e. 
> YTransaction->next if input transaction is from Y-valve)?

No matter of YValve - when SQL statement does not modify transaction 
(not start and not commit) same value to be returned.

> Should reference counter of the returned value to be increased if the 
> transaction is the same as input one?
>

Not. When new transaction is created it's ref/counter is set to 1.
(This exactly matches logic of assignRefNoIncr() function.)