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=head1 NAME

DBIx::Class::Optional::Dependencies - Optional module dependency specifications (for module authors)

=head1 SYNOPSIS

Somewhere in your build-file (e.g. L<Module::Install>'s Makefile.PL):

  ...

  configure_requires 'DBIx::Class' => '0.082842';

  require DBIx::Class::Optional::Dependencies;

  my $deploy_deps = DBIx::Class::Optional::Dependencies->req_list_for('deploy');

  for (keys %$deploy_deps) {
    requires $_ => $deploy_deps->{$_};
  }

  ...

Note that there are some caveats regarding C<configure_requires()>, more info
can be found at L<Module::Install/configure_requires>


=head1 DESCRIPTION

Some of the less-frequently used features of L<DBIx::Class> have external
module dependencies on their own. In order not to burden the average user
with modules he will never use, these optional dependencies are not included
in the base Makefile.PL. Instead an exception with a descriptive message is
thrown when a specific feature is missing one or several modules required for
its operation. This module is the central holding place for  the current list
of such dependencies, for DBIx::Class core authors, and DBIx::Class extension
authors alike.


=head1 CURRENT REQUIREMENT GROUPS

Dependencies are organized in C<groups> and each group can list one or more
required modules, with an optional minimum version (or 0 for any version).
The group name can be used in the


=head2 DBIx::Class::Admin

Modules required for the DBIx::Class administrative library

=over

=item * JSON::Any >= 1.23

=item * Moose >= 0.98

=item * MooseX::Types >= 0.21

=item * MooseX::Types::JSON >= 0.02

=item * MooseX::Types::LoadableClass >= 0.011

=item * MooseX::Types::Path::Class >= 0.05

=back

Requirement group: B<admin>

=head2 dbicadmin

Modules required for the CLI DBIx::Class interface dbicadmin

=over

=item * Getopt::Long::Descriptive >= 0.081

=item * JSON::Any >= 1.23

=item * Moose >= 0.98

=item * MooseX::Types >= 0.21

=item * MooseX::Types::JSON >= 0.02

=item * MooseX::Types::LoadableClass >= 0.011

=item * MooseX::Types::Path::Class >= 0.05

=item * Text::CSV >= 1.16

=back

Requirement group: B<admin_script>

=head2 Storage::DBI::deploy()

Modules required for L<DBIx::Class::Storage::DBI/deployment_statements> and L<DBIx::Class::Schema/deploy>

=over

=item * SQL::Translator >= 0.11018

=back

Requirement group: B<deploy>

=head2 Sybase ASE support

Modules required to connect to Sybase ASE

=over

=item * DBD::Sybase

=back

Requirement group: B<rdbms_ase>

=head2 DB2 support

Modules required to connect to DB2

=over

=item * DBD::DB2

=back

Requirement group: B<rdbms_db2>

=head2 DB2 on AS/400 support

Modules required to connect to DB2 on AS/400

=over

=item * DBD::ODBC

=back

Requirement group: B<rdbms_db2_400>

=head2 Firebird support

Modules required to connect to Firebird

=over

=item * DBD::Firebird

=back

Requirement group: B<rdbms_firebird>

=head2 Firebird support via DBD::InterBase

Modules required to connect to Firebird via DBD::InterBase

=over

=item * DBD::InterBase

=back

Requirement group: B<rdbms_firebird_interbase>

=head2 Firebird support via DBD::ODBC

Modules required to connect to Firebird via DBD::ODBC

=over

=item * DBD::ODBC

=back

Requirement group: B<rdbms_firebird_odbc>

=head2 Informix support

Modules required to connect to Informix

=over

=item * DBD::Informix

=back

Requirement group: B<rdbms_informix>

=head2 MS Access support via DBD::ADO (Windows only)

Modules required to connect to MS Access via DBD::ADO. This particular DBD is available on Windows only

=over

=item * DBD::ADO

=back

Requirement group: B<rdbms_msaccess_ado>

=head2 MS Access support via DBD::ODBC

Modules required to connect to MS Access via DBD::ODBC

=over

=item * DBD::ODBC

=back

Requirement group: B<rdbms_msaccess_odbc>

=head2 MSSQL support via DBD::ADO (Windows only)

Modules required to connect to MSSQL via DBD::ADO. This particular DBD is available on Windows only

=over

=item * DBD::ADO

=back

Requirement group: B<rdbms_mssql_ado>

=head2 MSSQL support via DBD::ODBC

Modules required to connect to MSSQL via DBD::ODBC

=over

=item * DBD::ODBC

=back

Requirement group: B<rdbms_mssql_odbc>

=head2 MSSQL support via DBD::Sybase

Modules required to connect to MSSQL via DBD::Sybase

=over

=item * DBD::Sybase

=back

Requirement group: B<rdbms_mssql_sybase>

=head2 MySQL support

Modules required to connect to MySQL

=over

=item * DBD::mysql

=back

Requirement group: B<rdbms_mysql>

=head2 Oracle support

Modules required to connect to Oracle

=over

=item * DBD::Oracle

=item * Math::Base36 >= 0.07

=item * Math::BigInt >= 1.80

=back

Requirement group: B<rdbms_oracle>

=head2 PostgreSQL support

Modules required to connect to PostgreSQL

=over

=item * DBD::Pg

=back

Requirement group: B<rdbms_pg>

=head2 SQLAnywhere support

Modules required to connect to SQLAnywhere

=over

=item * DBD::SQLAnywhere

=back

Requirement group: B<rdbms_sqlanywhere>

=head2 SQLAnywhere support via DBD::ODBC

Modules required to connect to SQLAnywhere via DBD::ODBC

=over

=item * DBD::ODBC

=back

Requirement group: B<rdbms_sqlanywhere_odbc>

=head2 SQLite support

Modules required to connect to SQLite

=over

=item * DBD::SQLite

=back

Requirement group: B<rdbms_sqlite>

=head2 Storage::Replicated

Modules required for L<DBIx::Class::Storage::DBI::Replicated>

=over

=item * Clone

=item * Moose >= 0.98

=item * MooseX::Types >= 0.21

=item * MooseX::Types::LoadableClass >= 0.011

=back

Requirement group: B<replicated>

=head1 METHODS

=head2 req_group_list

=over

=item Arguments: none

=item Return Value: \%list_of_requirement_groups

=back

This method should be used by DBIx::Class packagers, to get a hashref of all
dependencies keyed by dependency group. Each key (group name) can be supplied
to one of the group-specific methods below.


=head2 req_list_for

=over

=item Arguments: $group_name

=item Return Value: \%list_of_module_version_pairs

=back

This method should be used by DBIx::Class extension authors, to determine the
version of modules a specific feature requires in the B<current> version of
DBIx::Class. See the L</SYNOPSIS> for a real-world
example.


=head2 req_ok_for

=over

=item Arguments: $group_name

=item Return Value: 1|0

=back

Returns true or false depending on whether all modules required by
C<$group_name> are present on the system and loadable.


=head2 req_missing_for

=over

=item Arguments: $group_name

=item Return Value: $error_message_string

=back

Returns a single line string suitable for inclusion in larger error messages.
This method would normally be used by DBIx::Class core-module author, to
indicate to the user that he needs to install specific modules before he will
be able to use a specific feature.

For example if some of the requirements for C<deploy> are not available,
the returned string could look like:

 SQL::Translator >= 0.11018 (see DBIx::Class::Optional::Dependencies for details)

The author is expected to prepend the necessary text to this message before
returning the actual error seen by the user.


=head2 die_unless_req_ok_for

=over

=item Arguments: $group_name

=back

Checks if L</req_ok_for> passes for the supplied C<$group_name>, and
in case of failure throws an exception including the information
from L</req_missing_for>.


=head2 req_errorlist_for

=over

=item Arguments: $group_name

=item Return Value: \%list_of_loaderrors_per_module

=back

Returns a hashref containing the actual errors that occurred while attempting
to load each module in the requirement group.


=head1 FURTHER QUESTIONS?

Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>.

=head1 COPYRIGHT AND LICENSE

This module is free software L<copyright|DBIx::Class/COPYRIGHT AND LICENSE>
by the L<DBIx::Class (DBIC) authors|DBIx::Class/AUTHORS>. You can
redistribute it and/or modify it under the same terms as the
L<DBIx::Class library|DBIx::Class/COPYRIGHT AND LICENSE>.

