[Catalyst] sql debugging hooks

Minty mintywalker at gmail.com
Sat Jul 11 18:45:08 GMT 2009


I'm trying to create some hooks to make it easy to see what sql
queries are being run by any particular catalyst request.

I have:

    package My::Schema;
    use base qw/DBIx::Class::Schema/;

and then Schema/Employee.pm module, etc:

    package My::Schema::Employee;
    use base qw/DBIx::Class/;

I also have:

    package My::Model::DB;
    use base qw/Catalyst::Model::DBIC::Schema/;
    __PACKAGE__->config(schema_class => 'My::Schema');

as described in Catalyst::Model::DBIC::Schema, so that in my Catalyst
Controllers I can do:

    my $model = $c->model('DB::Employee');

And that all works, I can run queries against it and the connection
details are magically loaded from my.conf.

Then, for debugging sql queries, I have:

    package My::Model::Debugger;
    use base qw<DBIx::Class::Storage::Statistics>;
    sub query_start { ... }

Now currently I have this in a Controller module:

    my $debugger = My::Model::Debugger->new();
    my $model = $c->model('DB::Employee');
    my $employee = $mode->find(123);

Which results in my query_start method being called with the sql being run and
the parameters for it.  Which is what I was after.

But I want to inject my $debugger via the Model or schema, and
enable/disable it globablly via a configuration file flag.

I'm a bit lost as to where/how I can do that.  Any pointers?

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