Re: Taking trace () to the next level ...

On Tue, 2 Sep 2008 11:15:20 +0100, Tim Bunce <[email protected]>
wrote:

> On Mon, Sep 01, 2008 at 05:01:40PM -0700, Jonathan Leffler wrote:
> > On Mon, Sep 1, 2008 at 3:30 PM, Tim Bunce <[email protected]> wrote:
> > 
> > > On Mon, Sep 01, 2008 at 01:31:57PM +0200, H.Merijn Brand wrote:
> > > > On Sun, 31 Aug 2008 23:56:43 +0100, Tim Bunce <[email protected]>
> > > > wrote:
> > > >
> > > > > Having said all that, I can see some value in having a separate driver
> > > > > trace level. I suggest a few of the "middle 16 bits" are given over to
> > > >
> > > > IMHO 4 bits will do (0..15). If that is correct, I'll also change the
> > > > levels to leave the basic levels 1 and 2 alone.
> > >
> > > Actually I'd rather squeeze the levels concept down to 0..7 for both DBI
> > > and DBD levels in order to make two more flag bits available and to
> > > encourage greater use of flags.
> > 
> > FWIW, DBD::Informix uses trace levels from about 3 to 9 (leaving 1 and 2 for
> > DBI output only).
> > 
> > Whether that matters is another issue, but 4 bits would be preferred (though
> > three is not the end of the world).  Unless you have a use for those 2 bits
> > at the back of your mind...
> 
> Although it looks like the trace level range is being reduced, it's
> effectively being increased. It's just that instead of a single range
> you'd now have two.
> 
> The current highest levels of driver internals tracing would then
> be controlled via the DBD trace level. Something like this:
> 
>     $h->trace("2,-6"); # DBI trace level 2, DBD trace level 6
> 
> That gives you more control because you can enable higher levels of DBD
> tracing without being swamped by higher levels of DBI tracing.

Sounds ok

> You could/should also define some trace flags for specific topics to
> give finer control. Something like this:
>
>     $h->trace("2,-4,ix_charset");

We will need some extra macro's to get the dbd level and the flags
Any suggestions?

-- 
H.Merijn Brand          Amsterdam Perl Mongers  http://amsterdam.pm.org/
using & porting perl 5.6.2, 5.8.x, 5.10.x, 5.11.x on HP-UX 10.20, 11.00,
11.11, 11.23, and 11.31, SuSE 10.1, 10.2, and 10.3, AIX 5.2, and Cygwin.
http://mirrors.develooper.com/hpux/           http://www.test-smoke.org/
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