PHP ADODB library build-in an useful feature. It is SQL logging. simple to use just
please read how to use LogSQL for more info.
But many people wonder why SQL queries is not loged in to table "adodb_logsql".
If you make sure no wrong in your code, let's check this. Open file adodb-perf.inc.php then find $ADODB_PERF_MIN variable.
$ADODB_PERF_MIN = 0.05;
Yes, adodb will log only query which spend time more than 0.05 second by default. So let's increase the value, may be 0.00001 or -1 if you want to logged any queries.