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Manual Reference Pages  -  DBIX::CLASS::SCHEMA::LOADER (3)

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DBIx::Class::Schema::Loader - Create a DBIx::Class::Schema based on a database



    ### use this module to generate a set of class files

    # in a script
    use DBIx::Class::Schema::Loader qw/ make_schema_at /;
        { debug => 1,
          dump_directory => ./lib,
        [ dbi:Pg:dbname="foo", myuser, mypassword,
           { loader_class => MyLoader } # optionally

    # from the command line or a shell script with dbicdump (distributed
    # with this module).  Do `perldoc dbicdump` for usage.
    dbicdump -o dump_directory=./lib \
             -o components=["InflateColumn::DateTime"] \
             -o debug=1 \
             My::Schema \
             dbi:Pg:dbname=foo \
             myuser \

    ### or generate and load classes at runtime
    # note: this technique is not recommended
    # for use in production code

    package My::Schema;
    use base qw/DBIx::Class::Schema::Loader/;

        constraint              => ^foo.*,
        # debug                 => 1,

    #### in application code elsewhere:

    use My::Schema;

    my $schema1 = My::Schema->connect( $dsn, $user, $password, $attrs);
    # -or-
    my $schema1 = "My::Schema"; $schema1->connection(as above);


DBIx::Class::Schema::Loader automates the definition of a DBIx::Class::Schema by scanning database table definitions and setting up the columns, primary keys, unique constraints and relationships.

See dbicdump for the dbicdump utility.

DBIx::Class::Schema::Loader currently supports only the DBI storage type. It has explicit support for DBD::Pg, DBD::mysql, DBD::DB2, DBD::Firebird, DBD::InterBase, DBD::Informix, DBD::SQLAnywhere, DBD::SQLite, DBD::Sybase (for Sybase ASE and MSSSQL), DBD::ODBC (for MSSQL, MSAccess, Firebird and SQL Anywhere) DBD::ADO (for MSSQL and MSAccess) and DBD::Oracle. Other DBI drivers may function to a greater or lesser degree with this loader, depending on how much of the DBI spec they implement, and how standard their implementation is.

Patches to make other DBDs work correctly welcome.

See DBIx::Class::Schema::Loader::DBI::Writing for notes on writing your own vendor-specific subclass for an unsupported DBD driver.

This module requires DBIx::Class 0.08127 or later, and obsoletes the older DBIx::Class::Loader.

See DBIx::Class::Schema::Loader::Base for available options.



The loader object, as class data on your Schema. For methods available see DBIx::Class::Schema::Loader::Base and DBIx::Class::Schema::Loader::DBI.


Argument: $loader_class
Set the loader class to be instantiated when connection is called. If the classname starts with ::, DBIx::Class::Schema::Loader is prepended. Defaults to storage_type in DBIx::Class::Schema (which must start with :: when using DBIx::Class::Schema::Loader).

This is mostly useful for subclassing existing loaders or in conjunction with dump_to_dir.


Argument: \%loader_options
Example in Synopsis above demonstrates a few common arguments. For detailed information on all of the arguments, most of which are only useful in fairly complex scenarios, see the DBIx::Class::Schema::Loader::Base documentation.

If you intend to use loader_options, you must call loader_options before any connection is made, or embed the loader_options in the connection information itself as shown below. Setting loader_options after the connection has already been made is useless.


Arguments: @args
Return Value: $new_schema
See connection in DBIx::Class::Schema for basic usage.

If the final argument is a hashref, and it contains the keys loader_options or loader_class, those keys will be deleted, and their values value will be used for the loader options or class, respectively, just as if set via the loader_options or loader_class methods above.

The actual auto-loading operation (the heart of this module) will be invoked as soon as the connection information is defined.


See clone in DBIx::Class::Schema.


Argument: $directory
Calling this as a class method on either DBIx::Class::Schema::Loader or any derived schema class will cause all schemas to dump manual versions of themselves to the named directory when they are loaded. In order to be effective, this must be set before defining a connection on this schema class or any derived object (as the loading happens as soon as both a connection and loader_options are set, and only once per class).

See dump_directory in DBIx::Class::Schema::Loader::Base for more details on the dumping mechanism.

This can also be set at module import time via the import option dump_to_dir:/foo/bar to DBIx::Class::Schema::Loader, where /foo/bar is the target directory.


    # My::Schema isa DBIx::Class::Schema::Loader, and has connection info
    #   hardcoded in the class itself:
    perl -MDBIx::Class::Schema::Loader=dump_to_dir:/foo/bar -MMy::Schema -e1

    # Same, but no hard-coded connection, so we must provide one:
    perl -MDBIx::Class::Schema::Loader=dump_to_dir:/foo/bar -MMy::Schema -e My::Schema->connection("dbi:Pg:dbname=foo", ...)

    # Or as a class method, as long as you get it done *before* defining a
    #  connection on this schema class or any derived object:
    use My::Schema;

    # Or as a class method on the DBIx::Class::Schema::Loader itself, which affects all
    #   derived schemas
    use My::Schema;
    use My::OtherSchema;

    # Another alternative to the above:
    use DBIx::Class::Schema::Loader qw| dump_to_dir:/foo/bar |;
    use My::Schema;
    use My::OtherSchema;


Arguments: $schema_class_name, \%loader_options, \@connect_info
Return Value: $schema_class_name
This function creates a DBIx::Class schema from an existing RDBMS schema. With the dump_directory option, generates a set of DBIx::Class classes from an existing database schema read from the given dsn. Without a dump_directory, creates schema classes in memory at runtime without generating on-disk class files.

For a complete list of supported loader_options, see DBIx::Class::Schema::Loader::Base

The last hashref in the \@connect_info can specify the loader_class.

This function can be imported in the usual way, as illustrated in these Examples:

    # Simple example, creates as a new class New::Schema::Name in
    #  memory in the running perl interpreter.
    use DBIx::Class::Schema::Loader qw/ make_schema_at /;
        { debug => 1 },
        [ dbi:Pg:dbname="foo",postgres,,
          { loader_class => MyLoader } # optionally

    # Inside a script, specifying a dump directory in which to write
    # class files
    use DBIx::Class::Schema::Loader qw/ make_schema_at /;
        { debug => 1, dump_directory => ./lib },
        [ dbi:Pg:dbname="foo",postgres,,
          { loader_class => MyLoader } # optionally

The last hashref in the \@connect_info is checked for loader arguments such as loader_options and loader_class, see connection for more details.


Return Value: @new_monikers
Re-scans the database for newly added tables since the initial load, and adds them to the schema at runtime, including relationships, etc. Does not process drops or changes.

Returns a list of the new monikers added.


Arguments: \%opts | $ver
Controls the naming options for backward compatibility, see naming in DBIx::Class::Schema::Loader::Base for details.

To upgrade a dynamic schema, use:


Can be imported into your dump script and called as a function as well:



Arguments: 1|0
Controls the use_namespaces options for backward compatibility, see use_namespaces in DBIx::Class::Schema::Loader::Base for details.

To upgrade a dynamic schema, use:


Can be imported into your dump script and called as a function as well:



    Multiple Database Schemas

See db_schema in DBIx::Class::Schema::Loader::Base.


Matt S Trout, all of the #dbix-class folks, and everyone who’s ever sent in a bug report or suggestion.

Based on DBIx::Class::Loader by Sebastian Riedel

Based upon the work of IKEBE Tomohiro


blblack: Brandon Black <>


ilmari: Dagfinn Ilmari Mannsaaker <>

arcanez: Justin Hunter <>

ash: Ash Berlin <>

btilly: Ben Tilly <>

Caelum: Rafael Kitover <>

TSUNODA Kazuya <>

rbo: Robert Bohne <>

ribasushi: Peter Rabbitson <>

gugu: Andrey Kostenko <>

jhannah: Jay Hannah <>

jnap: John Napiorkowski <>

rbuels: Robert Buels <>

timbunce: Tim Bunce <>

mst: Matt S. Trout <>

mstratman: Mark A. Stratman <>

kane: Jos Boumans <>

waawaamilk: Nigel McNie <>

acmoore: Andrew Moore <>

bphillips: Brian Phillips <>

schwern: Michael G. Schwern <>

SineSwiper: Brendan Byrd <>

hobbs: Andrew Rodland <>

domm: Thomas Klausner <>

spb: Stephen Bennett <>

Matias E. Fernandez <>

alnewkirk: Al Newkirk <>

angelixd: Paul C. Mantz <>

andrewalker: Andre\k:'Walker <>

mattp: Matt Phillips <>

Dag-Erling Smo\k:/rgrav <>

moritz: Moritz Lenz <>

oalders: Olaf Alders <>

mephinet: Philipp Gortan <>

... and lots of other folks. If we forgot you, please write the current maintainer or RT.


Copyright (c) 2006 - 2009 by the aforementioned AUTHOR in DBIx::Class::Schema::Loader and CONTRIBUTORS in DBIx::Class::Schema::Loader.

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


DBIx::Class, DBIx::Class::Manual::Intro, DBIx::Class::Tutorial, DBIx::Class::Schema::Loader::Base
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