Anthony Gorecki wrote:
> Hello,
>
> I've been encountering an unusual string of errors while attempting to
> retrieve information from a database using DBD-mysql-2.9007 and mysql-4.1.12.
> The database in question is of type InnoDB. Below is an example:
>
> #!/usr/bin/perl -w
>
> use strict;
> use DBI;
>
> my $db_conn = DBI->connect('DBI:mysql:infrastructure', 'system', 'readonly');
> if (!$db_conn) {
> error('The program was unable to connect to the database.');
> }
>
> $_ = $db_conn->selectrow_array("
> SELECT [EMAIL PROTECTED] := (
> SELECT user_id FROM users WHERE username = 'agorecki' LIMIT 1)
> );
> ");
>
> if (!defined($_)) {
> $db_conn->disconnect();
> error('It appears that the user account has disappeared since login '.
> 'time...'
> );
> }
>
>
> The same query in MySQL will return the session variable, however DBD-mysql
> returns undefined. Similarly, when I run:
>
> SELECT type
> FROM svn_access
> WHERE 'test' REGEXP REPLACE(path_regex, '\$USERNAME\$', 'agorecki') = 1
> AND (user_id = @user_id
> OR group_id = ANY (SELECT group_id FROM group_memberships WHERE
> user_id = @user_id)
> OR (user_id IS NULL AND group_id IS NULL)
> )
> ORDER BY type DESC LIMIT 1;
>
>
> through selectrow_array (properly encoded for use in a PERL script), I also
> receive an undefined result. The above query correctly returns one row when
> input into a MySQL console and executed.
>
> The only thing that actually managed to execute and return a value
> successfully was:
> $_ = $db_conn->selectrow_array("SELECT 'hello';");
>
> Any thoughts?
>
>
Have you checked the DBI error status? See the parts about $DBI::err,
$DBI::errstr, and RaiseError here:
http://search.cpan.org/~timb/DBI-1.48/DBI.pm
Zac
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