How do i deploy a schema correctly with DBIx::Class? - mysql

Question

i'am new to Databases and to DBIx:Class. So please forgive me if this is a total newbie fault.
I just followed a tutorial and then i tried to deploy the schema to my database. According to the tutorial i split the modules up in several files. After i ran createTable.pl 'mysqlshow bla' shows me a empty database.
Database is up and running. Creating a table via the mysql CREATE TABLE statement does work.
Skript file which should create a table according to the schema ../createTable.pl
#!/usr/bin/env perl
use Modern::Perl;
use MyDatabase::Main;
my ($database, $user) = ('bla', 'flo');
my $schema = MyDatabase::Main->connect("dbi:mysql:dbname=$database", "$user");
$schema->deploy( { auto_drop_tables => 1 } );
Main.pm for loading the namespaces ../MyDatabase/Main.pm
package MyDatabase::Main;
use base qw/ DBIx::Class::Schema /;
__PACKAGE__->load_namespaces();
1;
Schema file for the table ../MyDatabase/Result/Album.pm
package MyDatabase::Main::Result::Album;
use base qw/ DBIx::Class::Core /;
__PACKAGE__->load_components(qw/ Ordered /);
__PACKAGE__->position_column('rank');
__PACKAGE__->table('album');
__PACKAGE__->add_columns(albumid =>
{ accessor => 'album',
data_type => 'integer',
size => 16,
is_nullable => 0,
is_auto_increment => 1,
},
artist =>
{ data_type => 'integer',
size => 16,
is_nullable => 0,
},
title =>
{ data_type => 'varchar',
size => 256,
is_nullable => 0,
},
rank =>
{ data_type => 'integer',
size => 16,
is_nullable => 0,
default_value => 0,
}
);
__PACKAGE__->set_primary_key('albumid');
1;
I already spent some hours on finding help through google but there isn't much related to the deploy() method.
Can anyone explain me what my mistake is?
Thank you

Answer 1

You can find the documentation for all CPAN Perl modules on metacpan.org (newer, full-text indexed) and search.cpan.org.
Read the docs for DBI, you'll find an environment variable called DBI_TRACE that when set will print every SQL statement to STDOUT.
DBIx::Class has a similar called DBIC_TRACE.
The first one should help you to see what the deploy method is doing.
Is no password required for connecting to your database?

Answer 2

Ok today i played again with perl and database stuff and i found out what the mistake was.
First of all i started with DBI_TRACE and DBIC_TRACE, it produced a lot of messages but nothing i could handle, for me it seemed like nothing gave me a hint on the problem.
Then i searched google for a while about this problem and for more examples of the deploy method. At some point i noticed that my folder structure is wrong.
The Schema file for the table should be placed in
../MyDatabase/Main/Result/Album.pm
instead of being placed in
../MyDatabase/Result/Album.pm
After moving the Schema file to the correct folder everything worked well.
Shame on me for this mistake :( But thank you for your help