Dancer::Plugin::DBIC(3) DBIx::Class interface for Dancer applications

VERSION

version 0.2102

SYNOPSIS


use Dancer;
use Dancer::Plugin::DBIC qw(schema resultset rset);
get '/users/:user_id' => sub {
my $user = schema('default')->resultset('User')->find(param 'user_id');
# If you are accessing the 'default' schema, then all the following
# are equivalent to the above:
$user = schema->resultset('User')->find(param 'user_id');
$user = resultset('User')->find(param 'user_id');
$user = rset('User')->find(param 'user_id');
template user_profile => {
user => $user
};
};
dance;

DESCRIPTION

This plugin makes it very easy to create Dancer applications that interface with databases. It automatically exports the keyword "schema" which returns a DBIx::Class::Schema object. You just need to configure your database connection information. For performance, schema objects are cached in memory and are lazy loaded the first time they are accessed.

This plugin is now just a thin wrapper around DBICx::Sugar.

CONFIGURATION

Configuration can be done in your Dancer config file.

simple example

Here is a simple example. It defines one database named "default":

    plugins:
      DBIC:
        default:
          dsn: dbi:SQLite:dbname=myapp.db
          schema_class: MyApp::Schema

multiple schemas

In this example, there are 2 databases configured named "default" and "foo":

    plugins:
      DBIC:
        default:
          dsn: dbi:SQLite:dbname=myapp.db
          schema_class: MyApp::Schema
        foo:
          dsn: dbi:Pg:dbname=foo
          schema_class: Foo::Schema
          user: bob
          password: secret
          options:
            RaiseError: 1
            PrintError: 1

Each database configured must at least have a dsn option. The dsn option should be the DBI driver connection string. All other options are optional.

If you only have one schema configured, or one of them is named "default", you can call "schema" without an argument to get the only or "default" schema, respectively.

If a schema_class option is not provided, then DBIx::Class::Schema::Loader will be used to dynamically load the schema by introspecting the database corresponding to the dsn value. You need DBIx::Class::Schema::Loader installed for this to work.

WARNING: Dynamic loading is not recommended for production environments. It is almost always better to provide a schema_class option.

The schema_class option should be the name of your DBIx::Class::Schema class. See ``SCHEMA GENERATION'' Optionally, a database configuration may have user, password, and options parameters as described in the documentation for "connect()" in DBI.

connect_info

Alternatively, you may also declare your connection information inside an array named "connect_info":

    plugins:
      DBIC:
        default:
          schema_class: MyApp::Schema
          connect_info:
            - dbi:Pg:dbname=foo
            - bob
            - secret
            -
              RaiseError: 1
              PrintError: 1

replicated

You can also add database read slaves to your configuration with the "replicated" config option. This will automatically make your read queries go to a slave and your write queries go to the master. Keep in mind that this will require additional dependencies: DBIx::Class::Optional::Dependencies#Storage::Replicated See DBIx::Class::Storage::DBI::Replicated for more details. Here is an example configuration that adds two read slaves:

    plugins:
      DBIC:
        default:
          schema_class: MyApp::Schema
          dsn: dbi:Pg:dbname=master
          replicated:
            balancer_type: ::Random     # optional
            balancer_args:              # optional
                auto_validate_every: 5  # optional
                master_read_weight:1    # optional
            # pool_type and pool_args are also allowed and are also optional
            replicants:
              -
                - dbi:Pg:dbname=slave1
                - user1
                - password1
                -
                  quote_names: 1
                  pg_enable_utf8: 1
              -
                - dbi:Pg:dbname=slave2
                - user2
                - password2
                -
                  quote_names: 1
                  pg_enable_utf8: 1

alias

Schema aliases allow you to reference the same underlying database by multiple names. For example:

    plugins:
      DBIC:
        default:
          dsn: dbi:Pg:dbname=master
          schema_class: MyApp::Schema
        slave1:
          alias: default

Now you can access the default schema with "schema()", "schema('default')", or "schema('slave1')". This can come in handy if, for example, you have master/slave replication in your production environment but only a single database in your development environment. You can continue to reference "schema('slave1')" in your code in both environments by simply creating a schema alias in your development.yml config file, as shown above.

FUNCTIONS

schema

    my $user = schema->resultset('User')->find('bob');

The "schema" keyword returns a DBIx::Class::Schema object ready for you to use. If you have configured only one database, then you can simply call "schema" with no arguments. If you have configured multiple databases, you can still call "schema" with no arguments if there is a database named "default" in the configuration. With no argument, the "default" schema is returned. Otherwise, you must provide "schema()" with the name of the database:

    my $user = schema('foo')->resultset('User')->find('bob');

resultset

This is a convenience method that will save you some typing. Use this only when accessing the "default" schema.

    my $user = resultset('User')->find('bob');

is equivalent to:

    my $user = schema->resultset('User')->find('bob');

rset

    my $user = rset('User')->find('bob');

This is simply an alias for "resultset".

SCHEMA GENERATION

Setting the schema_class option and having proper DBIx::Class classes is the recommended approach for performance and stability. You can use the dbicdump command line tool provided by DBIx::Class::Schema::Loader to help you. For example, if your app were named Foo, then you could run the following from the root of your project directory:

    dbicdump -o dump_directory=./lib Foo::Schema dbi:SQLite:/path/to/foo.db

For this example, your "schema_class" setting would be 'Foo::Schema'.

CONTRIBUTORS

  • Alexis Sukrieh <[email protected]>
  • Dagfinn Ilmari Mannsa┬░ker <<https://github.com/ilmari>>
  • David Precious <[email protected]>
  • Fabrice Gabolde <<https://github.com/fgabolde>>
  • Franck Cuny <[email protected]>
  • Steven Humphrey <<https://github.com/shumphrey>>
  • Yanick Champoux <<https://github.com/yanick>>

AUTHORS

  • Al Newkirk <[email protected]>
  • Naveed Massjouni <[email protected]>

COPYRIGHT AND LICENSE

This software is copyright (c) 2010 by awncorp.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.