How "prepare" gets the "real" value of $ID is a mystery to me. But it does! I have several programs that work with this syntax.

It's not prepare that does the magic voodoo, it's the double quotes (and we like to call it interpolation). You really ought to understand the "mystery", especially if you are doing web programming or any other code that allows arbitrary user input. If you are going to interpolate variables into a SQL string, at least do it the "right" way:

my $q_ID = $dbh->quote($ID);
my $sth = $dbh->prepare("select foo from bar where baz = $q_ID");

[download]
In general though, it's better to use placeholders.

In reply to Re^5: perl, mysql: "fetchrow_array failed: fetch() without execute()" by runrig
in thread perl, mysql: "fetchrow_array failed: fetch() without execute()" by gojira

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.