The second way is fine i think.. personally, i generally write it like this (easily extendable to handle conditional building of the statement): 
my $sql = "SELECT foo FROM Bar WHERE 1=1";
my @bind;
$sql .= " AND baz in ( " . join(',', map {'?'} @ins) . ") ";
push @bind, @ins;
$dbh->selectall_arrayref($sql, {}, @bind);

[download]
Another way is to use something like SQL::Abstract: 
use SQL::Abstract;
my $SA = SQL::Abstract->new;
my ($sql, @bind) = $SA->select('Bar', ['foo'], {baz => \@ins});
$dbh->selectall_arrayref($sql, {}, @bind);

[download]

In reply to Re: DBI and variable numbers of bind parameters by davidrw
in thread DBI and variable numbers of bind parameters by friedo

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.