On Tue, May 17, 2005 at 04:17:15PM -0700, Jonathan Leffler wrote:
> Also, the example code used $dbh->can()
> as if it returns some sort of subroutine reference - whereas the
> manual only says it returns true or false. Is the DBI manual
> inaccurate or just incomplete and it actually returns something
> usable?
There's fairly deep magic going on here. Returning a code-ref is
undocumented because of potential problems. And guess what...
here's a problem.
FYI: see the UNIVERSAL::can() docs for background info.
> On 5/17/05, Konstantin Solodovnikov <[EMAIL PROTECTED]> wrote:
> > I'm having a problem with DBD::Informix when using it's functions via a
> > 'goto &$sub' mechanism.
>
> Que? What on earth is that? Why do you want to use it? Where did it ever
> work?
goto &foo
is like
return foo(@_)
but reuses the current sub's call frame and args.
It's rarely used and less rarely needed.
sub prepare_sql
{
# uncommenting the next line will avoid core dump
# return $DBH->prepare( 'select * from ');
my $sub = $DBH->can( 'prepare');
@_ = ( $DBH, 'select * from ' );
goto &$sub;
}
Messing with @_ before using goto & is just asking for trouble.
Bottom line: If it hurts then stop doing it.
Tim.
