Tim, Thanks, I do keep forgetting about Driver.xst.
So, just to be clear. In DBI.pm, selectrow_array calls _do_selectrow which calls prepare/execute/fetchsomething but this may be overriden by a driver using selectrow_array in Driver.xst. If this is the case: a) is there any way for my subclassed DBI to know this? b) is there an easy way to identify which other methods this could apply to Martin -- Martin J. Evans Easysoft Ltd, UK http://www.easysoft.com On 29-Mar-2006 Tim Bunce wrote: > On Wed, Mar 29, 2006 at 11:54:32AM +0100, Martin J. Evans wrote: >> The issue I am seeing is not quite as general as I made it sound. For >> selectrow_hashref I see prepare/execute/fetch/fetchrow_hashref (as I expect) >> but >> for selectrow_arrayref and selectrow_array I only see prepare. > > Generally... Drivers are free to implement any method in any way they choose. > Their own methods don't have to call execute(), for example. > > Specifically... you're probably seeing the effect of the Driver.xst > C code that most compiled drivers embed into themselves. That code > embeds C implementations of selectall_arrayref and several other > methods into the driver itself. The selectall_arrayref code calls the > drivers C functions to do the work. The result is much, much, faster > than going though perl/DBI method dispatch for each row. > > Tim. > >> Martin >> -- >> Martin J. Evans >> Easysoft Ltd, UK >> http://www.easysoft.com >> >> >> On 29-Mar-2006 Martin J. Evans wrote: >> > Hi, >> > >> > I have subclassed DBI and override many methods including prepare, execute >> > and >> > select* although they are predominantly just passed on to DBI. >> > >> > If I do: >> > >> > my $sth->prepare(sql); >> > $sth->execute; >> > >> > I see the prepare and execute and pass them on to DBI. >> > >> > If I do: >> > >> > $dbh->selectrow_array(sql); >> > >> > I see prepare and pass it on, but do not see execute. In my case this is >> > more >> > than an annoyance as I cannot see any bound parameter passed to execute. >> > >> > e.g. >> > >> > $selectrow_array = [ >> > 'select b from mytest where a = ?', >> > undef, >> > \1 >> > ]; >> > prepare: select b from mytest where a = ? >> > !!! no execute here >> > >> > Or, perhaps I'm doing something wrong. >> > >> > Can anyone tell me if I should be seeing the execute when $dbh->select*** >> > is >> > called? I think I should. >> > >> > Thanks >> > >> > Martin >> > -- >> > Martin J. Evans >> > Easysoft Ltd, UK >> > http://www.easysoft.com
