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There is a difference. For example, DBI's do() returns the number of rows affected -- but some statements succeed even though no rows were affected. This allows for the following bit of code to be sane:

my $rows = $dbh->do( 'UPDATE MyTable SET note_date = GETDATE() WHERE ErrorCode IS NOT NULL' ); if ($rows) { # true, even if zero rows were affected. print 'Found and updated rows: (',$rows,")\n"; } else { warn 'Error during update query'; }

Having a query affect zero rows is perfectly valid, and doesn't necessarily mean an error. This makes even more sense when other methods in the same program return '0' as the false value rather than undef: it allows for programmer choice and a consistent read.

Larry Wall is Yoda: there is no try{}
The Code that can be seen is not the true Code

In reply to Re^2: The best "true zero" is... by radiantmatrix
in thread The best "true zero" is... by tye 

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    [Tux]: None work for me. My dead key is AltGr (right Alt)
    [Tux]: And I just tested, neither do other Tk apps :) (95% of my Tk Apps is either just monitoring (no input) or input of just numbers). Something to investigate then
    [choroba]: Maybe something like this?
    [choroba]: I vaguely remember we had problems with dead keys in Tk at $work - 2, but I forgot all the details
    [choroba]: but it was worse on MSWin than on Linux
    [choroba]: (and OSX didn't exist yet)

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