Re: Time to Document Callbacks

On Oct 25, 2009, at 10:24 PM, David E. Wheeler wrote:

> It output nothing. When I uncommented that second-to-last line, it  
> output "Set in STH". So it seems that a callback added to the dbh  
> for a statement method name does not end up getting passed on to the  
> statement handle. So I guess the Callbacks attribute is not passed  
> on to statement handles created for the database handle? Seems a  
> shame…

One other thing: It's nice that the callbacks execute before the  
method call, so that you can disable it by undefing $_. But it'd be  
equally handle to have callbacks after the method call. For example,  
I'd love to be able to create a callback on a statement handle to  
convert a timestamp column to a DateTime object:

     $sth->{PostCallbacks}{fetch} = sub {
         my ($sth, $row) = @_;
         $row->[3] = DateTime::Format::Pg->parse_datetime($row->[3]);
     };

Is this something that's done at any level in the callbacks, or would  
it have to be added? Thoughts?

Thanks,

David