I'd reach for sprintf too. But I'd put my one line on seven. Does that count? :-) 
my $str = sprintf(
  q{CALL DB_PROC_FOO(%s)},
  join(
    q{,},
    (q{?}) x $n,
  ),
);

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I like to use parens in these cases to have something to pin the ; to. And if there are other joins, splits etc. it stops perl getting confused about where lists start and end.

In reply to Re^2: Rewrite in a more compact way by wfsp
in thread Rewrite in a more compact way by andreas1234567

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