DBIx::Class::CDBICompat(3pm)				User Contributed Perl Documentation			      DBIx::Class::CDBICompat(3pm)

NAME

       DBIx::Class::CDBICompat - Class::DBI Compatibility layer.

SYNOPSIS

	 package My::CDBI;
	 use base qw/DBIx::Class::CDBICompat/;

	 ...continue as Class::DBI...

DESCRIPTION

       DBIx::Class features a fully featured compatibility layer with Class::DBI and some common plugins to ease transition for existing CDBI
       users.

       This is not a wrapper or subclass of DBIx::Class but rather a series of plugins.  The result being that even though you're using the
       Class::DBI emulation layer you are still getting DBIx::Class objects.  You can use all DBIx::Class features and methods via CDBICompat.
       This allows you to take advantage of DBIx::Class features without having to rewrite your CDBI code.

   Plugins
       CDBICompat is good enough that many CDBI plugins will work with CDBICompat, but many of the plugin features are better done with
       DBIx::Class methods.

       Class::DBI::AbstractSearch

       "search_where()" is fully emulated using DBIC's search.	Aside from emulation there's no reason to use "search_where()".

       Class::DBI::Plugin::NoCache

       "nocache" is fully emulated.

       Class::DBI::Sweet

       The features of CDBI::Sweet are better done using DBIC methods which are almost exactly the same.  It even uses Data::Page.

       Class::DBI::Plugin::DeepAbstractSearch

       This plugin will work, but it is more efficiently done using DBIC's native search facilities.  The major difference is that DBIC will not
       infer the join for you, you have to tell it the join tables.

   Choosing Features
       In fact, this class is just a recipe containing all the features emulated.  If you like, you can choose which features to emulate by
       building your own class and loading it like this:

	 package My::DB;
	 __PACKAGE__->load_own_components(qw/CDBICompat/);

       this will automatically load the features included in My::DB::CDBICompat, provided it looks something like this:

	 package My::DB::CDBICompat;
	 __PACKAGE__->load_components(qw/
	   CDBICompat::ColumnGroups
	   CDBICompat::Retrieve
	   CDBICompat::HasA
	   CDBICompat::HasMany
	   CDBICompat::MightHave
	 /);

LIMITATIONS

   Unimplemented
       The following methods and classes are not emulated, maybe in the future.

       Class::DBI::Query
	   Deprecated in Class::DBI.

       Class::DBI::Column
	   Not documented in Class::DBI.  CDBICompat's columns() returns a plain string, not an object.

       data_type()
	   Undocumented CDBI method.

   Limited Support
       The following elements of Class::DBI have limited support.

       Class::DBI::Relationship
	   The semi-documented Class::DBI::Relationship objects returned by "meta_info($type, $col)" are mostly emulated except for their "args"
	   method.

       Relationships
	   Relationships between tables (has_a, has_many...) must be declared after all tables in the relationship have been declared.	Thus the
	   usual CDBI idiom of declaring columns and relationships for each class together will not work.  They must instead be done like so:

	       package Foo;
	       use base qw(Class::DBI);

	       Foo->table("foo");
	       Foo->columns( All => qw(this that bar) );

	       package Bar;
	       use base qw(Class::DBI);

	       Bar->table("bar");
	       Bar->columns( All => qw(up down) );

	       # Now that Foo and Bar are declared it is safe to declare a
	       # relationship between them
	       Foo->has_a( bar => "Bar" );

AUTHORS

       Matt S. Trout <mst@shadowcatsystems.co.uk>

LICENSE

       You may distribute this code under the same terms as Perl itself.

perl v5.14.2							    2011-05-10					      DBIx::Class::CDBICompat(3pm)