Greetings all,
Aside from needing to fix up your query methodology (adopting the use of placeholders "?" would be a good start) you have no else for your if condition. Since there is no else that might be the reason "It's printing all the elements of @id as checked".
try something like this 
if ($identifier eq $id[$i]){
  print "<tr><td><input type=\"checkbox\" name=\"rt\" CHECKED value=\"
+$id[$i]\"> $id[$i]</td></tr>";
} else {
  print "<tr><td><input type=\"checkbox\" name=\"rt\" value=\"$id[$i]\
+"> $id[$i]</td></tr>";
}

[download]
HTH
-injunjoel

In reply to Re: mysql database by injunjoel
in thread mysql database by bory

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.