Trace level 1
 
 
- Level 1 shows method returns with first two parameters, results, and line numbers:
    DBI::db=HASH(0x823c6f4) trace level 0x0/1 (DBI 0x0/0) DBI 1.43 (pid 78730)
    <- prepare('UPDATE prices SET price=? WHERE prod_id=?')=
			DBI::st=HASH(0x823a478) at trace-ex1.pl line 10
    <- prepare_cached('INSERT INTO prices (prod_id,price) VALUES(?,?)')=
			DBI::st=HASH(0x823a58c) at trace-ex1.pl line 11
    <- execute('42.2' '1')= 1 at trace-ex1.pl line 12
    <- STORE('TraceLevel' 0)= 1 at trace-ex1.pl line 4
    <- DESTROY(DBI::st=HASH(0x823a478))= undef at trace-ex1.pl line 4
- Level 1 now only shows methods called by application
- 
- not recursive calls made by the DBI or driver