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    $arrayRef = $dbh->selectrow_arrayref("SELECT password FROM table WHERE
+ username = '$username'") or die "Error: " . $dbh->errstr;
  2. or download this
    $sth = $dbh->prepare("SELECT password FROM table WHERE userName = '$us
+erName'") or die $dbh->errstr;
$result = $sth->execute();
print "There were no rows returned\n" if $result == 0;