Question on 'SQL' tracing

After seeing the recent posting by Greg Sabino Mullane in subject "Log 
DBI query and values with placeholders" I realised there was something 
else DBD::ODBC was out of date with - tracing.

DBD::ODBC does not implement its own trace flags but neither does it 
react to 'SQL' tracing. If I set trace('SQL') I can see the TraceLevel 
is set to 256 and I can find:

     sub parse_trace_flag {
         my ($h, $name) = @_;
         #      0xddDDDDrL (driver, DBI, reserved, Level)
         return 0x00000100 if $name eq 'SQL';
         return;
     }

in DBI. So to test if 'SQL' is enabled we:

if *DBIc_TRACE_LEVEL(imp_xxh) & 256) {blah;}

Is that correct? No constant I am missing?

Martin
-- 
Martin J. Evans
Easysoft Limited
http://www.easysoft.com