On 2/11/2011 7:20 PM, Trevor Leffler wrote:
Hello,
I am investigating whether DBIC has support for switching between
logical databases (ala 'use db1; ...; use db2; ...;'). I've a situation
where there exist many cloned databases (same DDL), one per customer.
The current model is that all customers share the same front-end, and it
switches between DBs as needed. I would like to avoid the following:
multiple open connections per app process, multiple MyDB::Schema
objects, server hups upon customer adds/drops, etc.
My user authentication holds information on a particular login's
'default db'. I then use InstancePerContext. Not sure if this is a
great solution so I'm posting for criticism as much as anything.
<code>
package MyApp::Model::DB;
use strict;
use base 'Catalyst::Model::DBIC::Schema';
use Moose;
with 'Catalyst::Component::InstancePerContext';
__PACKAGE__->config(
schema_class => 'MyApp::DBICSchema::DB',
connect_info => []
);
sub build_per_context_instance {
my ($self, $c) = @_;
my $new = bless({ %$self }, ref($self));
$new->schema( $self->schema->connect( {
dsn => 'dbi:Pg:dbname=' . $c->user->default_db->dbname .
';host=' . $c->user->default_db->dbhost,
user => $c->user->default_db->dbusername,
password => $c->user->default_db->dbpassword } ) );
}
</code>
The very reasonable suggestion to combine all of the client databases
into one is being considered, so please let's not get side-tracked by
that line of thought, thanks. :)
So... how might I have my Schema issue a 'use $db' prior to any queries?
Or perhaps are there other solutions to how one could have multiple DB
clones while avoiding the code and connection scaling issues?
Thanks,
--Trevor
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