use Perl

• Re: Ask use.perl.org - Class Tree + Driver API ? (Score:1)

  by cosimo (4138)

  Hi Alias,

  I don't know if I understood completely what you are trying to accomplish, but I think I have developed a similar system, that is used to access different data sources (txt, ftp, http, sql, AS/400, ...) with a single interface. Sql class in particular has the behaviour you mention, in that it supports Postgres, Mysql, Oracle, DB2, Sybase, Informix, ...

  In my case, I have a "Driver" class with many subclasses like Pg, Oracle, Sybase, MSSQL, ... that are embedded in a $self->{driver} membe
• DBIx::Class (Score:1)

  by ChrisDolan (2855)

  I'm probably over-simplifying your problem, but I think that the solution adopted by DBIx::Class is a nice brain fit. Under Catalyst, I would say something like:

  my $query = $c->model('Entity::Person');
  $query = $query->search({age => ['==', 30]});
  $query = $query->search({mumble...  => ['==', 'Fido']});
  $query = $query->search(undef, {order_by => 'name ASC'});
  my $adam = $query->first;

  where I don't know how to write the "mumble" part off the top of my head, but it's probably acc
  • Re: (Score:1)

    by Alias (5735)

    Unfortunately, yes this oversimplifies the problem.
    
    It solves the problem by getting rid of the class tree altogether and using Perl structures.
    
    Here's another example of the sort of stuff I'm doing.
    
# We need a certain type of person
my $query = MyApp::Entity::Person->Fetch;
$query->condition('OptimizedFor', '==', 'fun');
$query->condition(
        MyApp::SQL::Collection->OR(
                MyApp::SQL::Clause->new('Lame', 'is null'),

    • Re: (Score:1)

      by Alias (5735)

      Ack, my "less than" condition in the nested structure broke it :(
      
      But you get the point.