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.\" ========================================================================
.\"
.IX Title "DBIx::Class::CDBICompat 3pm"
.TH DBIx::Class::CDBICompat 3pm "2014-10-23" "perl v5.20.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
DBIx::Class::CDBICompat \- Class::DBI Compatibility layer.
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&  package My::CDBI;
\&  use base qw/DBIx::Class::CDBICompat/;
\&
\&  ...continue as Class::DBI...
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
DBIx::Class features a fully featured compatibility layer with Class::DBI
and some common plugins to ease transition for existing \s-1CDBI\s0 users.
.PP
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 \s-1CDBI\s0 code.
.SS "Plugins"
.IX Subsection "Plugins"
CDBICompat is good enough that many \s-1CDBI\s0 plugins will work with CDBICompat, but many of the plugin features are better done with DBIx::Class methods.
.PP
\fIClass::DBI::AbstractSearch\fR
.IX Subsection "Class::DBI::AbstractSearch"
.PP
\&\f(CW\*(C`search_where()\*(C'\fR is fully emulated using \s-1DBIC\s0's search.  Aside from emulation there's no reason to use \f(CW\*(C`search_where()\*(C'\fR.
.PP
\fIClass::DBI::Plugin::NoCache\fR
.IX Subsection "Class::DBI::Plugin::NoCache"
.PP
\&\f(CW\*(C`nocache\*(C'\fR is fully emulated.
.PP
\fIClass::DBI::Sweet\fR
.IX Subsection "Class::DBI::Sweet"
.PP
The features of CDBI::Sweet are better done using \s-1DBIC\s0 methods which are almost exactly the same.  It even uses Data::Page.
.PP
\fIClass::DBI::Plugin::DeepAbstractSearch\fR
.IX Subsection "Class::DBI::Plugin::DeepAbstractSearch"
.PP
This plugin will work, but it is more efficiently done using \s-1DBIC\s0's native search facilities.  The major difference is that \s-1DBIC\s0 will not infer the join for you, you have to tell it the join tables.
.SS "Choosing Features"
.IX Subsection "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:
.PP
.Vb 2
\&  package My::DB;
\&  _\|_PACKAGE_\|_\->load_own_components(qw/CDBICompat/);
.Ve
.PP
this will automatically load the features included in My::DB::CDBICompat,
provided it looks something like this:
.PP
.Vb 8
\&  package My::DB::CDBICompat;
\&  _\|_PACKAGE_\|_\->load_components(qw/
\&    CDBICompat::ColumnGroups
\&    CDBICompat::Retrieve
\&    CDBICompat::HasA
\&    CDBICompat::HasMany
\&    CDBICompat::MightHave
\&  /);
.Ve
.SH "LIMITATIONS"
.IX Header "LIMITATIONS"
.SS "Unimplemented"
.IX Subsection "Unimplemented"
The following methods and classes are not emulated, maybe in the future.
.IP "Class::DBI::Query" 4
.IX Item "Class::DBI::Query"
Deprecated in Class::DBI.
.IP "Class::DBI::Column" 4
.IX Item "Class::DBI::Column"
Not documented in Class::DBI.  CDBICompat's \fIcolumns()\fR returns a plain string, not an object.
.IP "\fIdata_type()\fR" 4
.IX Item "data_type()"
Undocumented \s-1CDBI\s0 method.
.SS "Limited Support"
.IX Subsection "Limited Support"
The following elements of Class::DBI have limited support.
.IP "Class::DBI::Relationship" 4
.IX Item "Class::DBI::Relationship"
The semi-documented Class::DBI::Relationship objects returned by \f(CW\*(C`meta_info($type, $col)\*(C'\fR are mostly emulated except for their \f(CW\*(C`args\*(C'\fR method.
.IP "Relationships" 4
.IX Item "Relationships"
Relationships between tables (has_a, has_many...) must be declared after all tables in the relationship have been declared.  Thus the usual \s-1CDBI\s0 idiom of declaring columns and relationships for each class together will not work.  They must instead be done like so:
.Sp
.Vb 2
\&    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" );
.Ve
.SH "FURTHER QUESTIONS?"
.IX Header "FURTHER QUESTIONS?"
Check the list of additional \s-1DBIC\s0 resources.
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This module is free software copyright
by the DBIx::Class (\s-1DBIC\s0) authors. You can
redistribute it and/or modify it under the same terms as the
DBIx::Class library.