The following code when the 'update stock' condition returns 0, executes sql_error()'s sql 'insert into sql_error' AND dosql()'s 'insert into stock_valid' ,despite that the first statement of sql_error() is $dbh->rollback. I know that wrapping do_sql()'s sql statements in $dbh->begin_work would probably make it work, but I'm interested in the background of why it is happening.

I have a theory that every 'do' statement does start a new implicit transaction. So let's say that do(insert into stock_valid) is T1 and do(update stock) is T2. Then, T1 is rolled back when the rollback of sql_error() is hit, while T2 is not rolled back and instead is committed when $dbh->commit; of sql_error() is hit.

My 2cents. What do you think?

$dbh->{AutoCommit}=0;
$dbh->{RaiseError}=1;
$dbh->{HandleError}=\&handle_error;

sub do_sql() {
       $dbh->do(qq{
           insert into stock_valid
           (last_year,orderid,suppliervatno,
           code,executedquantity,productprice)
           values
           (
             $last_year,$orderid,$suppliervatno,
             $code,$executedquantity,$productprice
           )
        });


       my $rowsupdated=$dbh->do(qq{
               update stock 
               set quantity=quantity+$executedquantity
               where code=$code
              });
      if ($rowsupdated==0) {
       sql_error($order,'no rows found','LocalError');
      }
$dbh->commit;
$dbh->disconnect;
}
 
 
sub sql_error() {
  $dbh->rollback;
  my $orderid=$dbh->quote(shift);
  my $resultreason=$dbh->quote(shift);
  my $resultcode=$dbh->quote(shift);
  
  $dbh->do(qq{
      insert into sql_error
      (orderid,resultreason,resultcode)
      values
      (
      $orderid,$resultreason,$resultcode
      )
    });

   $dbh->commit;
   $dbh->disconnect;
   die;
}
[download]

Grandfather replaced pre tags with Code tags and fixed paragraphing.

---

---

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! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

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:
	&		&
	<		&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.