So If I use the prepare, it will give the query to the database server to compile it and then it will return the handle. If the function is called in a loop, then it will be in-efficient. In those case we can use prepare_cached, because we are using the same query and no need to compile it again.

I think this is a poor example since if you were executing the same SQL repeatedly in a loop you would prepare it once and execute it many times. The point about prepare_cached is that DBI holds on to the statement handle prepare_cached returns in the connection so even once you've finished your loop (and perhaps even the sub it is in) the statement handle is still available to use for the exact same SQL somewhere else in your program.

In reply to Re^2: dbi: prepare vs prepare_cached -- which is best ? by mje
in thread dbi: prepare vs prepare_cached -- which is best ? by sathiya.sw

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.