Re: Re: DBI error and $@


Pathologically Eclectic Rubbish Lister
	PerlMonks

Re: Re: DBI error and $@

by notsoevil (Pilgrim)

on Dec 06, 2001 at 23:12 UTC ( #130031=note: print w/replies, xml )

Need Help??

in reply to Re: DBI error and $@
in thread DBI error and $@

There is no other code. :)

There are no other warnings. :)

I know it should print something. However it is not, hence my confusion.

I'd really just like an explanation of the examples in the Perl DBI book and/or Randal's article on why they used the format:

eval {
 $dbh->do($statement);
 $dbh->commit();
}
if ($@) {
 $dbh->rollback();
 die $@;
}
[download]

I believe my sample code is an example of this (save the $dbh->rollback, but that isn't the issue). The examples check $@ and then die with it, after a rollback. If $@ isn't being printed (interpolated into my warn string), how does the conditional execute? If it is executing (and hence doing a rollback) when $@ does not have a printable value, this may affect my transactions.

Or am I just completely batty?

--
notsoevil
--
Jeremiah 49:32 - And their camels shall be a booty. . .

Comment on Re: Re: DBI error and $@ Download Code

Replies are listed 'Best First'.
(jeffa) Re: DBI error and $@ by jeffa (Bishop) on Dec 06, 2001 at 23:28 UTC
Hmmm ... using mysql v3.23.36, Perl 5.6.0, and DBI v1.20: `# connect with RaiseError set to true eval { $dbh->do('UPDATE a SET x = y'); $dbh->commit(); }; if ($@) { warn "flurg!: $@"; warn "flurg!: ", $dbh->errstr(); }` [download] yielded: `DBD::mysql::db do failed: Table 'mysql.a' doesn't exist at ./test_db_e +val.pl line 20. flurg!: DBD::mysql::db do failed: Table 'mysql.a' doesn't exist at ./t +est_db_eval.pl line 20. flurg!: Table 'mysql.a' doesn't exist at ./test_db_eval.pl line 25.` [download] jeffa L-LL-L--L-LL-L--L-LL-L-- -R--R-RR-R--R-RR-R--R-RR F--F--F--F--F--F--F--F-- (the triplet paradiddle)	[reply] [d/l] [select]
Re: (jeffa) Re: DBI error and $@ by runrig (Abbot) on Dec 06, 2001 at 23:39 UTC
That first warning is due to not turning PrintError off when turning RaiseError on (which many, including me, often neglect to do).	[reply]

In Section Seekers of Perl Wisdom

Domain Nodelet^?

www.com | www.net | www.org

Node Status^?

node history
Node Type: note [id://130031]
help

Chatterbox^?

How do I use this? • Last hour • Other CB clients

Other Users^?

Others having an uproarious good time at the Monastery: (4)

As of 2023-12-08 19:16 GMT

Sections^?

Information^?

Find Nodes^?

Leftovers^?

Voting Booth^?

Notices^?