Well, what I was envisioning would be safe in a multi-process environment. It would not be selecting the max id of the table, but rather selecting the id of the row that was inserted by using as conditions the values of the fields of the object that was just saved. I didn't like it as a fix without the imposition that some other key be specified as unique, and furthermore it worries me because of the overhead of the extra query, particularly if it means piping a lot of data back to the server in the form of the conditions.

I upgraded to DBI 1.42, and tried using the last_insert_id() method, but alas it refused to do anything other than return undef. I don't know what is up with that... My version of DBD::mysql is one away from the latest version, so I tried installing the new one on the suspicion that this would fix it since the latest version of DBD:mysql was released right after the version of DBI that incorporated the last_insert_id() method, but the compile barfed. :-(

In reply to Re^2: Auto-Increment and DBD Agnosticism by skyknight
in thread Auto-Increment and DBD Agnosticism by skyknight

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.