OK I'm really confused indeed right now.

I've got working code which goes like this: 

 $sth = $dbh->prepare( "
 SELECT  
   ## long complicated WHERE stuff
  " ) || die "Error: " . $dbh->errstr;

  $sth->execute() || die "Error: " . $dbh->errstr;    
  if( $sth->rows > 0 ){
     ## print out some results
  }

[download]

And according to this thread, I shouldn't do that, and I shouldn't rely on the results?

What should I do instead? Should I do the whole thing twice, like this? 

 $sth = $dbh->prepare( "
 SELECT COUNT(*) As Total
   ## long complicated WHERE stuff
  " ) || die "Error: " . $dbh->errstr;

  $sth->execute() || die "Error: " . $dbh->errstr;    
  if( $Total > 0 ){
     ## only if it passes this condition, do the REAL
     ## select and print out the results
  }

[download]

That seems bizarrely innefficient. 


($_='kkvvttuubbooppuuiiffssqqffssmmiibbddllffss')
 =~y~b-v~a-z~s;                             print

[download]

In reply to Re: SELECT COUNT and DBI: rows by Cody Pendant
in thread SELECT COUNT and DBI: rows by perleager

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.