When using DBI, is it safe to do a comparison like:

if (! $sth->fetchrow_array()) {
 #no rows returned
} else {
 # rows returned
}
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This feels like an error to me, though I can't prove why. Of course, I would prefer:

if ( $sth->rows() == 0 ) {
 #no rows returned
}
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I just would like to know if and why the first might be producing a bug in a program.