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Re: Re: DBI error and $@

by notsoevil (Pilgrim)
on Dec 06, 2001 at 23:12 UTC ( [id://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. . .

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]
      That first warning is due to not turning PrintError off when turning RaiseError on (which many, including me, often neglect to do).
[reply]

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