As a rule of thumb, you can only use SQL placeholders when the database can still come up with a query plan. Using a different table prevenets your database from coming up with a sensible query plan.

A more concise way to say this is that the placeholders can only stand in place for values, not for arbitrary syntax constructs.

You will have to construct the SQL by creating a string and replacing the variable parts in the string yourself.

There are some query builders, like SQL::Abstract, or DBIx::PreQL. In my experience, I found query builders to be too tedious, as I usually have to fight them too hard to get the SQL I want them to generate. I haven't used DBIx::PreQL, but it should allow you a more parametrized approach.

In reply to Re: Perl DBI '?' substitution with prepare/execute by Corion
in thread Perl DBI '?' substitution with prepare/execute by nikmit

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.