How I do it is: 

if (some_perl_code_condition)
{
  push @where, 'a.somedata5 <= ?';
  push @bind, $somedata5_max
}
# ...
$sql = $select .
  join(' AND ', @where) .
  $order;
# and use @bind for the execute statement

[download]
How I'd like to do it is abstract it away into comparison objects where stringifying it will mix in the AND and ORs, and maybe a list context for binding. But I've not stopped to think about it long enough to write any code for it :-)

Of course, I'll end up with a unique statement nearly each time through, so preparing becomes nearly useless (from a performance perspective anyway - almost may as well use do...), which may be a different concern.

Update: Added italicised pieces in last paragraph in response to graff.

In reply to Re: Perl style/best practice question: how to [better] embed SQL in code ? by Tanktalus
in thread Perl style/best practice question: how to [better] embed SQL in code ? by Krambambuli

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.